Name: preparation and characterization of c60/graphene hybrid nanostructures
Uploaded: 2018-05-15T13:00:00.000+00:00
Duration: 8 min 40 s
Description: Watch this Scientific Journal Video about Preparation and Characterization of C60/Graphene Hybrid Nanostructures at JoVE.com

这项工作由美国陆军研究办公室在赠款 W911NF-15-1-0414 下支持。

1. 自制努森细胞的研制
<ol><li>
准备努森单元的组件
	<ol>
<li>购买 cf 法兰基电源馈 (2.75 "CF, 4 针不锈钢)。钻两个螺纹孔通过馈, 在十字点之间的一个直径 1.30 "线和它的周长。</li>
		<li>准备一个玻璃管 (0.315 "外径 (OD), 2.50" 长度)。</li>
		<li>采购薄铜板 (99.9%) 与 0.005 "厚度。用剪刀将一张纸切成 7.5 "L x 5.0" W 的尺寸, 然后将其卷曲到带有 1.45 "手动直径" 的空心圆柱形通盾(图 1a)。</li>
		<li>将 K 型热电偶 (铬镍/alumel) 与 0.005 "直径切割 3" 长度为铬镍和 alumel 线。剥离绝缘层约 0.5 "长度从两端的两条电线。</li>
		<li>将0.01 英寸直径的钨线 (99.95%) 剪成大约60英寸的长度。线圈它到一个春天形状与直径 0.315 "通过紧紧包裹它在玻璃管的一个可比较的直径的杆附近。</li>
		<li>购买陶瓷片。准备一个合适的长方体件, 中间有一个孔, 适合玻璃的尺寸 (5 在图 1b)。</li>
		<li>切割2标准钢螺纹 0.10 "直径杆到 7" 长度通过捆扎和锯与车床机器。</li>
		<li>剪一个软, 0.01 "直径铜线到大约 30" 长度使用剪刀。</li>
		<li>准备4空心铜棒与 0.094 "外径直径通过切割三杆到 2" 长度, 和一个杆到 4 "长度使用侧刀。</li>
	</ol>
</li>
	<li>
在努森细胞中组装这些碎片
	<ol>
<li>清除步骤1.1 中提到的所有组件, 使用丙酮中的42赫超声波清洗30分钟。</li>
		<li>在电源馈的 CF 法兰的钻孔中安装2标准钢螺纹棒。 注意: 孔是螺纹的 (7 在图 1b) 中。</li>
		<li>在 CF 法兰式电源馈的4个针脚的顶部安装4空心铜棒的下半部分, 办法是将 pin 插入空心铜棒中, 并由侧面刀具 (6 in图 1b) 进行固定。</li>
		<li>将陶瓷片安装在 2.5 "高从螺纹棒底部与软铜线的位置。 注: 此片断将支持玻璃管在以下步骤 (5 在图 1b)。</li>
		<li>将玻璃管滑入卷曲的钨弹簧中。将玻璃管的底部挤压成陶瓷片的孔。使用软铜线将玻璃管的顶端保持在螺纹棒的顶端 (3 和4在图 1b) 中。</li>
		<li>把弹簧的上端夹在较长的铜杆上, 定义为 a. 把弹簧的底部握成一个较短的铜棒, 定义为 b (A 和 B 在图 1b)。</li>
		<li>将铬镍和 alumel 线的一个去皮端拧在一起 (2 in 图1b)。</li>
		<li>定位拧紧的接头端, 使其紧密接触玻璃管的外部底部。在陶瓷片的帮助下固定它。</li>
		<li>将铬镍导线的另一去皮端夹入左侧2条较短的铜棒中, 定义为 c 把 alumel 线的另一端去皮到左短铜杆中, 定义为 D (C 和 D在图1b)。</li>
		<li>将卷曲的铜空心圆柱形通盾放在 CF 法兰电源馈上(图 1a)。</li>
	</ol>
</li>
</ol>2. 在自制的努森细胞中准备 C60源
<ol><li>在自制的努森单元格中加载 C60源。<ol>
<li>将约50毫克的 C60粉末 (99.5% 纯度) 加载到自制努森细胞的玻璃管中。 注: 精度超过1毫克的粉末质量是不必要的。</li>
		<li>将努森单元格装回加载锁的一个分支上。</li>
	</ol>
</li>
	<li>泵入负载锁。<ol>
<li>打开泵上的负载锁。首先打开水阀, 冷却涡轮泵, 然后打开风扇冷却机械泵。然后打开机械泵, 最后打开涡轮泵。</li>
		<li>检查负载锁中的压力, 等待大约10小时。 注: 涡轮泵出口的压力应为 6.0 x 10-2毫巴。</li>
		<li>打开安装在负载锁中的离子表以降低压力 (通常低于 10-6毫巴)。</li>
		<li>检查负载锁中的压力: 在10小时泵浦后, 压力应在 10-8毫巴的范围内。</li>
	</ol>
</li>
	<li>在自制的努森单元格中退火 C60源。<ol>
<li>将 C60源在自制的努森单元中逐渐退火 (1.5 °c/分钟), 在250°c 为 2 h 进行脱气, 方法是在 CF 法兰电源馈的两个针脚上连接电源, 连接到卷曲的钨弹簧上。</li>
		<li>将退火温度提高到300摄氏度, 高于沉积温度 (270 摄氏度)。</li>
		<li>退火在300°c 为0.5 小时进一步脱气。</li>
		<li>将温度降低到270摄氏度以进行沉积。</li>
	</ol>
</li>
</ol>3. 在特高压室中制备原子清洁石墨烯
<ol><li>将石墨烯 (在铜箔上) 从样品存储传送带转到 STM 系统超高真空制备室的退火板 (在超高真空下制备和退火样品的特殊位置)。</li>
	<li>将石墨烯基体在制备腔内的低 10-10毫巴的基压下退火, 逐步将温度升高到400摄氏度。</li>
	<li>等待12小时, 去除石墨烯表面的残余杂质。</li>
	<li>将石墨烯基体的退火温度逐渐降低到室温。</li>
</ol>4. 使用自制的努森细胞在负载锁中将 C 60存入石墨烯基体上
<ol><li>将石墨烯基体转移到负载锁上。<ol>
<li>在准备室的转移位置安排板材。在原子清洁石墨烯和 C60源就绪后, 将原子清洁石墨烯转移到沉积 C60的负载锁中。</li>
		<li>在负载锁和准备室之间打开阀门。</li>
		<li>用装车工具将石墨烯基体从准备室的板上转移到负载锁。</li>
		<li>将石墨烯基体朝下 (C60来自下面的源)。</li>
	</ol>
</li>
	<li>将 C60存入石墨烯衬底上。 注: C60分子从自制的努森细胞转移到石墨烯基板, 在270摄氏度。<ol>
<li>等待1分钟的沉积速率为0.9 单层/分钟。</li>
		<li>将 C60/石墨烯样品转移回制备室。</li>
	</ol>
</li>
</ol>5. 准备在 STM 主腔内测量的 C 60 /石墨烯样品
<ol><li>将 C60/石墨烯样品退火至150摄氏度, 在超高真空制备室中, 2 h 的速率为3.1 摄氏度/分钟。</li>
	<li>用 stm 在 stm 主腔中扫描 C60/石墨烯样品。</li>
	<li>将 C60/石墨烯样品退火至210°c, 其速率为3.1 摄氏度/分钟, 为 2 h。</li>
	<li>用 STM 扫描 C60/石墨烯样品。</li>
</ol>

<ol>
	<li>Gutzler, R., Heckl, W. M., Lackinger, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Combination+of+a+Knudsen+effusion+cell+with+a+quartz+crystal+microbalance:+In+situ+measurement+of+molecular+evaporation+rates+with+a+fully+functional+deposition+source.">Combination of a Knudsen effusion cell with a quartz crystal microbalance: In situ measurement of molecular evaporation rates with a fully functional deposition source.</a> Review of Scientific Instruments. 81, 015108 (2010).</li><li>de Barros, A. L. F., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+simple+experimental+arrangement+for+measuring+the+vapour+pressures+and+sublimation+enthalpies+by+the+Knudsen+effusion+method:+Application+to+DNA+and+RNA+bases.">A simple experimental arrangement for measuring the vapour pressures and sublimation enthalpies by the Knudsen effusion method: Application to DNA and RNA bases.</a> Nuclear Instruments &amp; Methods in Physics Research Section a-Accelerators Spectrometers Detectors and Associated Equipment. 560, (2006).</li><li>Shukla, A. K., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Versatile+UHV+compatible+Knudsen+type+effusion+cell.">Versatile UHV compatible Knudsen type effusion cell.</a> Review of Scientific Instruments. 75, 4467 (2004).</li><li>Cho, J., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Structural+and+Electronic+Decoupling+of+C60+from+Epitaxial+Graphene+on+SiC.">Structural and Electronic Decoupling of C60 from Epitaxial Graphene on SiC.</a> Nano Letters. 12, 3018 (2012).</li><li>Jung, M., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Atomically+resolved+orientational+ordering+of+C60+molecules+on+epitaxial+graphene+on+Cu(111).">Atomically resolved orientational ordering of C60 molecules on epitaxial graphene on Cu(111).</a> Nanoscale. 6 (111), 11835 (2014).</li><li>Li, G., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Self-assembly+of+C60+monolayer+on+epitaxially+grown,+nanostructured+graphene+on+Ru(0001)+surface.">Self-assembly of C60 monolayer on epitaxially grown, nanostructured graphene on Ru(0001) surface.</a> Applied Physics Letters. 100 (0001), 013304 (2012).</li><li>Lu, J., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Using+the+Graphene+Moire+Pattern+for+the+Trapping+of+C60+and+Homoepitaxy+of+Graphene.">Using the Graphene Moire Pattern for the Trapping of C60 and Homoepitaxy of Graphene.</a> Acs Nano. 6, 944 (2012).</li><li>Zhou, H. T., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Direct+imaging+of+intrinsic+molecular+orbitals+using+two-dimensional,+epitaxially-grown,+nanostructured+graphene+for+study+of+single+molecule+and+interactions.">Direct imaging of intrinsic molecular orbitals using two-dimensional, epitaxially-grown, nanostructured graphene for study of single molecule and interactions.</a> Applied Physics Letters. 99, 153101 (2011).</li><li>Belaish, I., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Spin+Cast+Thin-Films+of+Fullerenes+and+Fluorinated+Fullerenes+-+Preparation+and+Characterization+by+X-Ray+Reflectivity+and+Surface+Diffuse-X-Ray+Scattering.">Spin Cast Thin-Films of Fullerenes and Fluorinated Fullerenes - Preparation and Characterization by X-Ray Reflectivity and Surface Diffuse-X-Ray Scattering.</a> Journal of Applied Physics. 71, 5248 (1992).</li><li>Bezmel'nitsyn, V. N., Eletskii, A. V., Okun', M. V. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Fullerenes+in+solutions.">Fullerenes in solutions.</a> Uspekhi Fizicheskikh Nauk. 168, 1195 (1998).</li><li>Ma, D. N., Sandoval, S., Muralidharan, K., Raghavan, S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Effect+of+surface+preparation+of+copper+on+spin-coating+driven+self-assembly+of+fullerene+molecules.">Effect of surface preparation of copper on spin-coating driven self-assembly of fullerene molecules.</a> Microelectronic Engineering. 170, 8 (2017).</li><li>Chen, C. H., Zheng, H. S., Mills, A., Heflin, J. R., Tao, C. G. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Temperature+Evolution+of+Quasi-one-dimensional+C60+Nanostructures+on+Rippled+Graphene.">Temperature Evolution of Quasi-one-dimensional C60 Nanostructures on Rippled Graphene.</a> Scientific Reports. 5, 14336 (2015).</li></ol>

我们没有什么可透露的。

本协议所描述的技术设计用于有机材料和其他高蒸气压材料的热沉积。这些技术可与超高真空系统集成, 具有样品制备区域, 能够支持分子蒸发和热退火。本实验的目的是在石墨烯基体上沉积 c60分子, 并研究 c60的自组装和热效应。
该方法的好处是, 它提供了一个超级干净的样品时, 与其他薄膜制备方法, 如自旋涂层。与化学气相沉积 (CVD) 等复杂技术相比, 这种?...

本协议解释如何在石墨烯上沉积和操作 c60分子, 这样可以实现1D 和 quasi-1D C60链结构。这项实验的技术是为了解决需要引导考察到理想的配置, 而不必依赖手动操作, 这是缓慢的, 并可能需要很大的努力。这里描述的过程依赖于使用一个高真空系统与样品准备区域能支持分子沉积和热退火样品。STM 是用来表征样品, 但其他分子分辨率技术可以应用。
努森细胞内分子的热蒸发是制备薄膜的一种高效、清洁的方法。在本协议中, 努森单元用于将 C60分子蒸发到石墨烯基板上。此努森电池蒸发器主要由石英管、加热灯丝、热电偶线和贯穿件可1、2、3组成.石英管用于容纳分子, 钨灯丝通过应用电流加热石英管中的分子, 热电偶导线用于测量温度。实验中, 通过对努森细胞中温度源的调节, 控制了沉积速率。热电偶导线附着在石英管的外壁上, 因此通常测量外部壁的温度, 这与分子源所在细胞内的温度稍有不同。为了获得石英管的精确温度, 我们用两个热电偶装置进行了标定, 以测量管内外的温度, 并记录了温度差。这样, 我们就可以更精确地控制在分子蒸发实验中使用连接到石英管外的热电偶线的温度。由于少量的升华分子将在一个较低的压力下的气态相, 当分子被蒸发, 通常有一个相关的压力变化。因此, 我们仔细地监视负载锁中压力的变化。
该蒸发器可用于存放各种分子源, 如 c60、c70、硼酞菁染料氯化物、Ga、Al 和Hg4、5、6、7、8。与其他薄膜制备技术相比, 自旋铸造9,10,11, 高真空中的热蒸发更清洁和多功能, 因为没有溶剂需要证言。此外, 沉积前的脱气过程提高了源的纯度, 消除了可能的杂质。

<table><tbody><tr><td>CF Flanged power feedthrough</td><td>Kurt J. Lesker</td><td>EFT0042033</td><td></td></tr><tr><td>Copper sheets</td><td>Alfa Aesar</td><td>7440-50-8</td><td></td></tr><tr><td>Thermocouple chromel/alumel wires</td><td>Omega Engineering</td><td>ST032034/ST080042</td><td></td></tr><tr><td>Tungsten wires</td><td>Alfa Aesar</td><td>7440-33-7</td><td></td></tr><tr><td>Stainless steel rods</td><td>McMaster-Carr</td><td>95412A868</td><td></td></tr><tr><td>Copper wires</td><td>McMaster-Carr</td><td>8873K28</td><td></td></tr><tr><td>Hollow copper rods</td><td>McMaster-Carr</td><td>7190K52</td><td></td></tr><tr><td>C&lt;sub&gt;60&lt;/sub&gt;</td><td>MER Corporation</td><td>MR6LP</td><td></td></tr></tbody></table>

preparation and characterization of c60/graphene hybrid nanostructures

高真空环境下的物理热沉积是制备石墨烯上新型分子纳米结构的一种清洁、可控的方法。我们提出了在波纹石墨烯上沉积和被动操作 C60分子的方法, 它推动了实现涉及 1D C60/石墨烯混合结构的应用。本博览会所采用的技术是针对高真空系统的, 其制备区域能够支持分子沉积以及样品的热退火。我们专注于 C60在低压沉积使用一个自制的努森细胞连接到扫描隧穿显微镜 (STM) 系统。通过控制努森细胞的温度和沉积时间来调节沉积分子的数量。一维 (1D) C60链结构, 其宽度为三个分子, 可通过对实验条件的调整来制备。C60分子的表面流动性随退火温度的增加而增大, 使它们能够在波纹石墨烯的周期性电位内移动。使用此机制, 可以控制 1D C60链结构的过渡到六角封闭包装 quasi-1D 条纹结构。

蒸发后, 新沉积的 C60的石墨烯退火为 2 h 的150摄氏度。图 2a中的大型 STM 映像显示了此初始退火过程后发现的特性 quasi-1D C60链结构。在图 2b中进行更仔细的检查, 可显示此1D 结构的详细信息, 其中每个明亮的球面凸起表示一个单一的 C60分子。通常, 1D 链作为分子和三分子 c 60 链出现, 其平均值为 c 60-C 60 距...

Watch this Scientific Journal Video about Preparation and Characterization of C60/Graphene Hybrid Nanostructures at JoVE.com

Preparation and Characterization of C60/Graphene Hybrid Nanostructures

C 型60/石墨烯混合纳米结构的制备与表征

在这里, 我们提出了一个协议, 以制造的 C60/石墨烯混合纳米结构的物理热蒸发。特别是, 适当地操纵沉积和退火条件, 可以控制在波纹石墨烯上创建1D 和准 1D C60结构。

Physical thermal deposition in a high vacuum environment is a clean and controllable method for fabricating novel molecular nanostructures on graphene. We ...

preparation-and-characterization-of-c60graphene-hybrid-nanostructures

Universidad San Sebastian

Research

JoVE Journal

Chemistry

Preparation and Characterization of C60/Graphene Hybrid Nanostructures

9.4K 次观看.  Virginia Tech. 在这里, 我们提出了一个协议, 以制造的 C60/石墨烯混合纳米结构的物理热蒸发。特别是, 适当地操纵沉积和退火条件, 可以控制在波纹石墨烯上创建1D 和准 1D C60结构。

视频: Preparation and Characterization of C60/Graphene Hybrid Nanostructures

Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities

Owing to its relativistic low-energy charge carriers, the interaction between graphene and various impurities leads to a wealth of new physics and degrees of freedom to control electronic devices. In particular, the behavior of graphene&#8217;s charge carriers in response to potentials from charged Coulomb impurities is predicted to differ significantly from that of most materials. Scanning tunneling microscopy (STM) and scanning tunneling spectroscopy (STS) can provide detailed information on both the spatial and energy dependence of graphene&#39;s electronic structure in the presence of a charged impurity.&#160;The design of a hybrid impurity-graphene device, fabricated using controlled deposition of impurities onto a back-gated graphene surface, has enabled several novel methods for controllably tuning graphene&#8217;s electronic properties.1-8 Electrostatic gating enables control of the charge carrier density in graphene and the ability to reversibly tune the charge2 and/or molecular5 states of an impurity. This paper outlines the process of fabricating a gate-tunable graphene device decorated with individual Coulomb impurities for combined STM/STS studies.2-5 These studies provide valuable insights into the underlying physics, as well as signposts for designing hybrid graphene devices.

This paper details the fabrication process of a gate-tunable graphene device, decorated with Coulomb impurities for scanning tunneling microscopy studies. Mapping the spatially dependent electronic structure of graphene in the presence of charged impurities unveils the unique behavior of its relativistic charge carriers in response to a local Coulomb potential.

对于扫描隧道显微学与库仑杂质制造门可调谐石墨烯器件

Owing to its relativistic low-energy charge carriers, the interaction between graphene and various impurities leads to a wealth of new physics and degrees ...

科研

工程学

Preparation and Evaluation of Hybrid Composites of Chemical Fuel and Multi-walled Carbon Nanotubes in the Study of Thermopower Waves

When a chemical fuel at a certain position in a hybrid composite of the fuel and a micro/nanostructured material is ignited, chemical combustion occurs along the interface between the fuel and core materials. Simultaneously, dynamic changes in thermal and chemical potentials across the micro/nanostructured materials result in concomitant electrical energy generation induced by charge transfer in the form of a high-output voltage pulse. We demonstrate the entire procedure of a thermopower wave experiment, from synthesis to evaluation. Thermal chemical vapor deposition and the wet impregnation process are respectively employed for the synthesis of a multi-walled carbon nanotube array and a hybrid composite of picric acid/sodium azide/multi-walled carbon nanotubes. The prepared hybrid composites are used to fabricate a thermopower wave generator with connecting electrodes. The combustion of the hybrid composite is initiated by laser heating or Joule-heating, and the corresponding combustion propagation, direct electrical energy generation, and real-time temperature changes are measured using a high-speed microscopy system, an oscilloscope, and an optical pyrometer, respectively. Furthermore, the crucial strategies to be adopted in the synthesis of hybrid composite and initiation of their combustion that enhance the overall thermopower wave energy transfer are proposed.

A protocol for conducting thermopower wave experiments is presented. The synthesis of hybrid composites of a chemical fuel and micro/nanostructured material, manufacturing of a thermopower wave generator, and methods for measuring the corresponding physical phenomena are described.

化学燃料和多壁碳纳米管的混杂复合材料的热电波的研究准备和评估

When a chemical fuel at a certain position in a hybrid composite of the fuel and a micro/nanostructured material is ignited, chemical combustion occurs ...

Preparation of Carbon Nanosheets at Room Temperature

Amphiphilic molecules equipped with a reactive, carbon-rich "oligoyne" segment consisting of conjugated carbon-carbon triple bonds self-assemble into defined aggregates in aqueous media and at the air-water interface. In the aggregated state, the oligoynes can then be carbonized under mild conditions while preserving the morphology and the embedded chemical functionalization. This novel approach provides direct access to functionalized carbon nanomaterials. In this article, we present a synthetic approach that allows us to prepare hexayne carboxylate amphiphiles as carbon-rich siblings of typical fatty acid esters through a series of repeated bromination and Negishi-type cross-coupling reactions. The obtained compounds are designed to self-assemble into monolayers at the air-water interface, and we show how this can be achieved in a Langmuir trough. Thus, compression of the molecules at the air-water interface triggers the film formation and leads to a densely packed layer of the molecules. The complete carbonization of the films at the air-water interface is then accomplished by cross-linking of the hexayne layer at room temperature, using UV irradiation as a mild external stimulus. The changes in the layer during this process can be monitored with the help of infrared reflection-absorption spectroscopy and Brewster angle microscopy. Moreover, a transfer of the carbonized films onto solid substrates by the Langmuir-Blodgett technique has enabled us to prove that they were carbon nanosheets with lateral dimensions on the order of centimeters.

We present the synthesis of an amphiphilic hexayne and its use in the preparation of carbon nanosheets at the air-water interface from a self-assembled monolayer of these reactive, carbon-rich molecular precursors.

碳纳米片在室温下准备

Amphiphilic molecules equipped with a reactive, carbon-rich "oligoyne" segment consisting of conjugated carbon-carbon triple bonds self-assemble into ...

化学

Visible-light Induced Reduction of Graphene Oxide Using Plasmonic Nanoparticle

Present work demonstrates the simple, chemical free, fast, and energy efficient method to produce reduced graphene oxide (r-GO) solution at RT using visible light irradiation with plasmonic nanoparticles. The plasmonic nanoparticle is used to improve the reduction efficiency of GO. It only takes 30 min&#160;at RT by illuminating the solutions with Xe-lamp, the r-GO solutions can be obtained by completely removing gold nanoparticles through simple centrifugation step. The spherical gold nanoparticles (AuNPs) as compared to the other nanostructures is the most suitable plasmonic nanostructure for r-GO preparation. The reduced graphene oxide prepared using visible light and AuNPs was equally qualitative as chemically reduced graphene oxide, which was supported by various analytical techniques such as UV-Vis spectroscopy, Raman spectroscopy, powder XRD and XPS. The reduced graphene oxide prepared with visible light shows excellent quenching properties over the fluorescent molecules modified on ssDNA and excellent fluorescence recovery for target DNA detection. The r-GO prepared by recycled AuNPs is found to be of same quality with that of chemically reduced r-GO. The use of visible light with plasmonic nanoparticle demonstrates the good alternative method for r-GO synthesis.

A simple protocol for the preparation of reduced graphene oxide using visible light and plasmonic nanoparticle is described.

可见光诱导的还原氧化石墨烯的使用电浆纳米粒子

Present work demonstrates the simple, chemical free, fast, and energy efficient method to produce reduced graphene oxide (r-GO) solution at RT using ...

Synthesis and Functionalization of 3D Nano-graphene Materials: Graphene Aerogels and Graphene Macro Assemblies

Efforts to assemble graphene into three-dimensional monolithic structures have been hampered by the high cost and poor processability of graphene. Additionally, most reported graphene assemblies are held together through physical interactions (e.g., van der Waals forces) rather than chemical bonds, which limit their mechanical strength and conductivity. This video method details recently developed strategies to fabricate mass-producible, graphene-based bulk materials derived from either polymer foams or single layer graphene oxide. These materials consist primarily of individual graphene sheets connected through covalently bound carbon linkers. They maintain the favorable properties of graphene such as high surface area and high electrical and thermal conductivity, combined with tunable pore morphology and exceptional mechanical strength and elasticity. This flexible synthetic method can be extended to the fabrication of polymer/carbon nanotube (CNT) and polymer/graphene oxide (GO) composite materials. Furthermore, additional post-synthetic functionalization with anthraquinone is described, which enables a dramatic increase in charge storage performance in supercapacitor applications.

This video method describes the synthesis of high surface area, monolithic 3D graphene-based materials derived from polymer precursors as well as single layer graphene oxide.

合成和3D纳米石墨烯材料的功能化:石墨烯气凝胶和石墨烯宏组件

Efforts to assemble graphene into three-dimensional monolithic structures have been hampered by the high cost and poor processability of graphene. ...

Preparation of ZnO Nanorod/Graphene/ZnO Nanorod Epitaxial Double Heterostructure for Piezoelectrical Nanogenerator by Using Preheating Hydrothermal

Well-aligned ZnO nanostructures have been intensively studied over the last decade for remarkable physical properties and enormous applications. Here, we describe a one-step fabrication technique to synthesis freestanding ZnO nanorod/graphene/ZnO nanorod double heterostructure. The preparation of the double heterostructure is performed by using thermal chemical vapor deposition (CVD) and preheating hydrothermal technique. In addition, the morphological properties were characterized by using the scanning electron microscopy (SEM). The utility of freestanding double heterostructure is demonstrated by fabricating the piezoelectric nanogenerator. The electrical output is improved up to 200% compared to that of a single heterostructure owing to the coupling effect of the piezoelectricity between the arrays of ZnO nanorods on the top and bottom of graphene. This unique double heterostructure have a tremendous potential for applications of electrical and optoelectrical devices where the high number density and specific surface area of nanorod are needed, such as pressure sensor, immuno-biosensor and dye-sensitized solar cells.

One-step fabrication method for obtaining freestanding epitaxial double heterostructure is presented. This approach could achieve ZnO coverage with a higher number density than that of the epitaxial single heterostructure, leading to a piezoelectric nanogenerator with an increased output electrical performance.

利用预热水热氧化锌纳米棒/石墨烯/氧化锌纳米棒外延双异质结的机压电纳米发电机的研制

Well-aligned ZnO nanostructures have been intensively studied over the last decade for remarkable physical properties and enormous applications. Here, we ...

Preparation of Liquid-exfoliated Transition Metal Dichalcogenide Nanosheets with Controlled Size and Thickness: A State of the Art Protocol

We summarize recent advances in the production of liquid-exfoliated transition metal dichalcogenide (TMD) nanosheets with controlled size and thickness. Layered crystals of molybdenum disulphide (MoS2) and tungsten disulphide (WS2) are exfoliated in aqueous surfactant solution by sonication. This yields highly polydisperse mixtures containing nanosheets with broad size and thickness distributions. However, for most purposes, specific sizes (in terms of both lateral dimension and thickness) are required. For example, large and thin nanosheets are desired for (opto) electronic applications, while laterally small nanosheets are interesting for catalytic applications. Therefore, post-exfoliation size selection is an important step that we address here. We provide a detailed protocol on the efficient size selection in large quantities by liquid cascade centrifugation and the size and thickness quantification by statistical microscopic analysis (atomic force microscopy and transmission electron microscopy). The comparison of MoS2 and WS2 shows that both materials are size-selected in a similar way by the same procedure. Importantly, the dispersions of size-selected nanosheets show systematic changes in their optical extinction spectra with size due to edge and confinement effects. We show how these optical changes are related quantitatively to the nanosheets dimensions and describe how mean nanosheets length and layer number can be extracted reliably from the extinction spectra. The exfoliation and size selection protocol can be applied to a broad range of layered crystals as we have previously demonstrated for graphene, gallium sulphide (GaS) and black phosphorus.

A protocol for the liquid exfoliation of layered materials to nanosheets, their size selection and size measurement by microscopic and spectroscopic techniques is presented.

与尺寸可控液体剥离的过渡金属二硫属化物纳米片和厚度的制备:艺术议定书的国家

We summarize recent advances in the production of liquid-exfoliated transition metal dichalcogenide (TMD) nanosheets with controlled size and thickness. ...

Fabrication of Three-Dimensional Graphene-Based Polyhedrons via Origami-Like Self-Folding

The assembly of two-dimensional (2D) graphene into three-dimensional (3D) polyhedral structures while preserving the graphene's excellent inherent properties has been of great interest for the development of novel device applications. Here, fabrication of 3D, microscale, hollow polyhedrons (cubes) consisting of a few layers of 2D graphene or graphene oxide sheets via an origami-like self-folding process is described. This method involves the use of polymer frames and hinges, and aluminum oxide/chromium protection layers that reduce tensile, spatial, and surface tension stresses on the graphene-based membranes when the 2D nets are transformed into 3D cubes. The process offers control of the size and shape of the structures as well as parallel production. In addition, this approach allows the creation of surface modifications by metal patterning on each face of the 3D cubes. Raman spectroscopy studies show the method allows the preservation of the intrinsic properties of the graphene-based membranes, demonstrating the robustness of our method.

Fabrication of Three-Dimensional Graphene-Based Polyhedrons via Origami-Like Self-Folding

Here, we present a protocol for fabrication of 3D graphene-based polyhedrons via origami-like self-folding.

基于折纸式自折叠的三维石墨烯正多面体的制备

The assembly of two-dimensional (2D) graphene into three-dimensional (3D) polyhedral structures while preserving the graphene's excellent inherent ...

Microscopic Visualization of Porous Nanographenes Synthesized through a Combination of Solution and On-Surface Chemistry

On-surface synthesis has recently been regarded as a promising approach for the generation of new molecular structures. It has been particularly successful in the synthesis of graphene nanoribbons, nanographenes and intrinsically reactive and instable, yet attractive species. It is based on the combination of solution chemistry aimed at preparation of appropriate molecular precursors for further ultra-high vacuum surface assisted transformations. This approach also owes its success to an incredible development of characterization techniques, such as scanning tunneling/atomic force microscopy and related methods, which allow detailed, local characterization at atomic scale. While the surface-assisted synthesis can provide molecular nanostructures with outstanding precision, down to single atoms, it suffers from basing on metallic surfaces and often limited yield. Therefore, the extension of the approach away from metals and the struggle to increase productivity seem to be significant challenges toward wider applications. Herein, we demonstrate the on-surface synthesis approach for generation of non-planar nanographenes, which are synthesized through a combination of solution chemistry and sequential surface-assisted processes, together with the detailed characterization by scanning probe microscopy methods.

<meta charset="utf8"></head><body>通过溶液和表面化学相结合合成的多孔纳米石墨烯的微观可视化

A combination of solution and surface assisted synthesis opens new directions in the atomically precise synthesis of nanostructures. Scanning tunneling microscopy (STM) supplemented by non-contact atomic force microscopy (nc-AFM) enables detailed characterization of newly designed and generated carbon-based nano-objects.

C 型₆₀/石墨烯混合纳米结构的制备与表征

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