Name: in situ synthesis of gold nanoparticles without aggregation in the interlayer space of layered titanate transparent films
Uploaded: 2017-01-17T14:00:00.000+00:00
Duration: 7 min 8 s
Description: Watch this Scientific Journal Video about In Situ Synthesis of Gold Nanoparticles without Aggregation in the Interlayer Space of Layered Titanate Transparent Films at JoVE.com

This work was partly supported by Nippon Sheet Glass Foundation for Materials Science and Engineering and JSPS KAKENHI (Grant-in-Aid for Challenging Exploratory Research, #50362281).

주의 : 화학 물질 및 솔루션 작업을 할 때 항상주의해야합니다. 적절한 안전 관행에 따라 항상 장갑, 안경 및 실험실 코트를 착용하십시오. 그들의 대량 대응에 비해 나노 물질 추가 위험이있을 수 있음을 유의하십시오. 리전트 1. 준비 <ol><li> (; MV 2+ 메틸 비올로 겐)을 물 20ml에 0.2 mM의 MV 2+을 수득 1,1&#39;- 디메틸 -4,4&#39;- 비피 리디 늄 디 클로라이드 0.0012 g을 용해시켜 메틸 비올로 겐 수용액을 준비한다. </li><li> 25 mM의 HAuCl 4 수득 물 10ml에 금 (III) 염화 수화물의 0.1050 g (HAuCl 4 • 3H 2 O)을 용해시켜 금 (III) 클로라이드 수용액을 준비한다. </li><li> 100 밀리미터의 NaBH 4 수득 물 10 ㎖ 중의 나트륨 테트라 히드로 보레이트의 0.03844 g을 용해하여 수소화 붕소 나트륨 수용액 (을 NaBH 4)을 준비한다. </li><li> dissolv에 의해 2 ammoniumethanethiol 수용액을 준비물 25 ㎖ 중의 2- ammoniumethanethiol 클로라이드 염 (2 AET +)의 0.2985 g을 보내고은 100 mM의 2 AET +를 얻었다. </li></ol> TNS 콜로이드 현탁액 2. 합성 참고 : 티타니아 나노 시트 (TNS 2의 Ti 0.91 O)은 잘 확립 된 절차에 따라 제조 이전에 22,23,30보고되었다. <ol><li> 고사 2 CO 3 (0.4040 g) 및 이산화 티탄의 화학량 론적 혼합물을 소성하여 적층 세슘, 티탄산 세슘 0.7 티 1.825 O (4)의 원료를 준비한다 (ST를 01, 0.5000 g) 800 ℃에서 20 시간 22. 두 번이 작업을 반복합니다. </li><li> 프로톤 화 층상 티탄산을 제조 (H 0.7 티 1.825 O 4 · H 2 O) 반복적 염산 (100 밀리미터, 81.42 mL)을 12 시간 동안 진탕 기 (300 Hz에서)를 이용하여 수용액 세슘, 티탄산 0.8142 g을 처리함으로써. </li><li> 박리 된 층상 티 탄산염 (TNS)에 의해 콜로이드 현탁액을 준비합니다어두운 조건 하에서 주위 온도에서 약 2 주 동안 수용액 - 17 mM의 테트라 부틸 암모늄 하이드 록 사이드 (TBA + OH) 25 mL를 양성자 티타 네이트 분말 (0.0998 g) 격렬 (500 RPM)를 교반. 그 결과 유백색 현탁액 티타니아 나노 시트 박리 포함 (TNS를 1.4 g / L, pH가 11 ~ 12). </li></ol> TNS 필름 (21) 3. 합성 <ol><li> TNS의 제조 영화를 캐스팅 (C-TNS) <ol><li> 사전 세정 된 유리 기판 (~ 20 × 20mm 2) 30 분 동안 1 M 수산화 나트륨 수용액 (수산화 나트륨)의 초음파 세척기 (27 kHz로)를 사용하여 초음파 치료 내지. </li><li> 초순수의 5 ~ 10 ㎖ (&lt;0.056 μS의 cm-1)와 기판을 씻어. </li><li> 3 분 동안 0.1 M 수성 염산 (HCL)에서 유리 기판을 담그고, 초순수 5-10 ㎖로 헹군다. </li><li> 1 시간 동안 순수한 물에 초음파 치료 (27 kHz에서)을 통해 기판을 청소하고,순수한 물로 씻어. (건조까지) 2 ~ 3 분 동안 헤어 드라이어 건조. </li><li> 300 ㎕의 분취 량의 유리 기판 상에 TNS의 콜로이드 현탁액을 캐스팅. </li><li> 60 ℃에서 2 시간 건조를 위해 C-TNS 막을 수득 건조 오븐을 사용. </li></ol></li><li> 소결 TNS 필름의 제조 예 (S-TNS) <ol><li> 6.8 ℃의 속도로 25에서 500 ℃로 3 시간 (가열 500 ℃에서 유리 기판 (S-TNS 막), 소결 대기 중의 수득 C-TNS 막에 TNS 성분의 열 고정을 달성하기 위해, 오븐을 사용하여 / 분). </li><li> 두 번 소결 과정을 반복합니다. </li></ol></li><li> 필름의 제조 <ol><li> 의 S-TNS 막이 용액에 침지하는 경우는 모든 실험 절차는 위쪽을 향하도록 증착 된 S-TNS 막 위치. </li><li> TNS의 광 반응을 방지하기 위해 알루미늄 호일로 설정을 덮어 어두운 조건에서 모든 실험을 수행한다. </li></ol></li><li> 사전메틸 비올로 겐 (MV 2+) 층상 TNS 필름 (TNS / MV 2+)의 paration <ol><li> 어두운 조건에서, 실온 (RT)에서 7 시간 동안 배양 접시에서 MV 2+ 클로라이드 염의 수용액 (0.2 mm의 3 ㎖)에 S-TNS 필름을 담근다. </li><li> ~ 1 시간 동안 어둠 속에서, 오븐을 사용하여 60 ° C에서 초순수 (50-10 ml) 및 건조 공기로 수득 된 샘플을 씻어. </li></ol></li><li> 금의 준비 (III) 층상 TNS 필름 (TNS / 금 (III)) <ol><li> 어두운 조건 하에서 RT에서 3 시간 동안 페트리 접시에 HAuCl 4의 수성 용액 (25 mM의 3 ㎖)에 TNS / MV 2+ 필름을 담근다. </li><li> ~ 1 시간 동안 어둠 속에서, 오븐을 사용하여 60 ° C에서 초순수 (50-10 ml) 및 건조 공기로 수득 된 샘플을 씻어. </li></ol></li><li> TNS 필름의 층간 공간 내에서 AuNP의 합성 (TNS / AuNP) <ol><li> 을 NaBH 4 수용액에 TNS / 금 (III) 막을 담가 </sub&gt; 어두운 조건에서 실온에서 0.5 시간 동안 배양 접시에 (0.1 M, 5 ㎖). </li><li> ~ 1 시간 동안 어둠 속에서 오븐을 이용하여 60 ℃에서 공기 중에서 얻어진 필름을 건조. </li></ol></li><li> 2 AET + 층상 TNS 필름의 제조 (TNS / 2-AET +) <ol><li> RT에서 24 시간 동안 배양 접시에 (0.1 M, 3 ㎖) - 2 + CL AET 수용액에서 S-TNS 필름을 담근다. </li><li> 린스 ~ 1 시간 동안 어둠 속에서, 오븐을 사용하여 60 ° C에서 초순수 (50-10 ml) 및 건조 공기로 필름을 수득. </li></ol></li><li> 금 (III) 2- AET + 공동 층상 TNS 필름 (TNS / 2 + AET / 금 (III)). <ol><li> RT에서 3 시간 동안 HAuCl 4의 수성 용액 (25 mM의 3 ㎖)에 TNS / 2 + AET 필름을 담근다. </li><li> ~ 1 시간 동안 어둠 속에서, 오븐을 사용하여 60 ° C에서 초순수 (50-10 ml) 및 건조 공기로 얻어진 필름을 씻어. </li></ol></li><li> AuNP의 withi의 합성n은 TNS / 2-AET + 필름의 층간 공간 (TNS / 2-AET + / AuNP). <ol><li> 어두운 조건 하에서 RT에서 0.5 시간 동안 배양 접시에서의 NaBH 4 (0.1 M, 5 ㎖)의 수용액으로 TNS / 2 + AET은 / 금 (III) 필름을 담근다. </li><li> ~ 1 시간 동안 어둠 속에서 오븐을 사용하여 60 ° C에서 초순수 (50-10 ml) 및 건조 공기로 얻어진 필름을 씻어. </li></ol></li><li> 특성화 <ol><li> 30 kV의 및 15mA에서 작동 X 선 회절 (XRD) monochromatized CU-K의 α 방사선 (λ = 0.15405 ㎚)와 데스크탑 X 선 회절 장치를 사용하여 (21)을 분석을 수행한다. </li><li> 에너지 분산 형 X 선 분광법 (EDS)의 스펙트럼 (21)을 가지고. </li><li> 투과성 모드 (21)를 이용하여 제조 된 샘플에 대한 UV-비스 흡수 스펙트럼을 기록하는 멀티 채널 광 검출기 또는 정상 상태의 자외선 - 가시 광선 (UV-비스) 흡광도를 이용한다. </li></ol></li></ol>

We have nothing to disclose.

이 원고는 TNS 필름의 층간 공간 내에서 금 나노 입자 (AuNPs)의 현장에서 합성을위한 상세한 프로토콜을 제공합니다. 이 TNS의 층간 공간 내 AuNPs의 제자리 합성의 첫 번째보고이다. 또한, 우리는 2 AET +는 TNS의 층간 내 AuNPs에 대한 효과적인 보호 시약으로 작동하는 것을 발견했다. 이러한 방법은 AuNPs와 TNS 투명 필름을 하이브리드. 프로토콜 절에 제시된 양호한 광학 투명도 21...

각종 귀금속 나노 입자 (MNPS) 인해 국소 표면 플라즈몬 공명 (LSPR) 속성 특성 색상 또는 색조를 나타내고; 따라서, MNPS 여러 광학 및 / 또는 광화학 1-4 애플리케이션에 사용될 수있다. 최근, 금속 산화물 반도체 등의 산화 티탄 (TiO2)과 같은 MNPS (MOS) 광촉매, 조합 충분히 광촉매 5-14 새로운 형태로 조사되었다. 가장 MOS 입자는 상대적으로 낮은 표면적을 가지고 있기 때문에, 많은 경우에서 MNPS 극소량은 MOS 표면에 존재한다. 한편, 적층 된 금속 산화물 반도체 (LMOSs) 광촉매 특성을 나타내는 큰 표면적 LMO에 15-17의 단위 g 당 일반적으로 수백 평방 미터가있다. 또한, 다양한 LMOSs는 인터 특성 (즉, 다양한 화학 종들은 팽창성 대형 층간 공간 내에 수용 될 수 있음)이 15 ~ 20. 따라서, MNPS LMOSs과의 조합으로, 이는 MNPS 비교적 많은 양의 상기 반도체 광촉매 혼성화되는 것으로 예상된다. (; TNS 16-30 티타니아 나노 시트) 투명 필름 매우 간단한 단계를 통해 우리는 구리 나노 입자 (CuNPs) LMO의 층간 공간 내에서 21의 현장 합성의 첫 번째를보고했다. 하지만, 합성 절차의 세부 사항 및 기타 귀금속 및 MNPS TNS 하이브리드의 특성은 아직보고되지 않았다. 또한, TNS 층 내의 CuNPs 쉽게 산화되어 주위 조건 하에서 21 탈색 하였다. 이에 따라 AuNPs 널리 다양한 광학, 광 화학적 및 촉매 적 용도로 사용되기 때문에, 금 나노 입자 (AuNPs)에 집중하고, 그들이 산화 3-5,7,8,10-14 대하여 상대적으로 안정 될 것으로 예상 , 28,31,32. 여기서 우리는 TNS와 쇼 그쪽의 층간 공간에 AuNPs의 합성을보고t 2 ammoniumethanethiol (2-AET +도 1 삽입)는 TNS의 층간 내 AuNPs에 대한 보호 시약으로 효과적으로 작동합니다.

<table><tbody><tr><td>Methyl viologen dichloride</td><td>Aldrich Chemical&amp;nbsp; Co., Inc.</td><td>1910-42-5</td><td></td></tr><tr><td>Tetrabutylammonium hydroxide</td><td>TCI</td><td>T1685</td><td></td></tr><tr><td>cesium carbonate</td><td>Kanto Chemical Co., Inc.</td><td>07184-33</td><td></td></tr><tr><td>anatase titanium dixoide</td><td>Ishihara Sangyo Ltd.</td><td>ST-01</td><td></td></tr><tr><td>hydrochloric acid</td><td>Junsei Chemical Co., Ltd.</td><td>20010-0350</td><td></td></tr><tr><td>sodium hydroxide</td><td>Junsei Chemical Co., Ltd.</td><td>195-13775</td><td></td></tr><tr><td>Tetrachloroauric(III) acid trihydrate</td><td>Kanto Chemical Co., Inc.</td><td>17044-60</td><td></td></tr><tr><td>sodium tetrahydroborate</td><td>Junsei Chemical Co., Ltd.</td><td>39245-1210</td><td></td></tr><tr><td>2-ammoniumethanethiol hydrochloride</td><td>TCI</td><td>A0296</td><td></td></tr><tr><td>Ultrapure water (0.056 &amp;micro;S/cm)</td><td></td><td></td><td>Milli-Q water purification system (Direct-Q&lt;sup&gt;&amp;reg;&lt;/sup&gt; 3UV, Millipore)</td></tr><tr><td>Microscope slide (Thickness: 1.0&amp;#8211;1.2 mm)</td><td>Matsunami glass Co., Ltd.</td><td></td><td></td></tr></tbody></table>

in situ synthesis of gold nanoparticles without aggregation in the interlayer space of layered titanate transparent films

Combinations of metal oxide semiconductors and gold nanoparticles (AuNPs) have been investigated as new types of materials. The in situ synthesis of AuNPs within the interlayer space of semiconducting layered titania nanosheet (TNS) films was investigated here. Two types of intermediate films (i.e., TNS films containing methyl viologen (TNS/MV2+) and 2-ammoniumethanethiol (TNS/2-AET+)) were prepared. The two intermediate films were soaked in an aqueous tetrachloroauric(III) acid (HAuCl4) solution, whereby considerable amounts of Au(III) species were accommodated within the interlayer spaces of the TNS films. The two types of obtained films were then soaked in an aqueous sodium tetrahydroborate (NaBH4) solution, whereupon the color of the films immediately changed from colorless to purple, suggesting the formation of AuNPs within the TNS interlayer. When only TNS/MV2+ was used as the intermediate film, the color of the film gradually changed from metallic purple to dusty purple within 30 min, suggesting that aggregation of AuNPs had occurred. In contrast, this color change was suppressed by using the TNS/2-AET+ intermediate film, and the AuNPs were stabilized for over 4 months, as evidenced by the characteristic extinction (absorption and scattering) band from the AuNPs.

전구체 필름의 두 가지 유형 (와 보호 시약 TNS의 층간 내 (2- AET +)없이 예) 본 연구에서 사용 하였다. (메틸 비올로 겐, MV 2+) -2- AET +, 1,1&#39;- 디메틸 -4,4&#39;- 비피 리디 늄 디 클로라이드가없는 MV 2+ 함유 LMOSs가 되었기 때문에, 층간 공간 팽창기로 하였다 자주 LMOSs 16,17,21,33-36 제조 게스트 교환 방법에서 중간체로 사용된다. <...

Watch this Scientific Journal Video about In Situ Synthesis of Gold Nanoparticles without Aggregation in the Interlayer Space of Layered Titanate Transparent Films at JoVE.com

In Situ Synthesis of Gold Nanoparticles without Aggregation in the Interlayer Space of Layered Titanate Transparent Films

여기서는 AuNPs의 응집이없는 티탄산 적층 필름의 층간 공간 내에서 금 나노 입자 (AuNPs)의 원위치에서의 합성을위한 프로토콜을 제시한다. 어떤 스펙트럼 변화도 사개월 후 관찰되지 않았다. 합성 된 물질은 촉매, 광촉매 및 경제적 플라즈몬 장치의 개발에 응용이 예상되었다.

계층화 된 티탄 투명 필름의 층간 공간에서 집계하지 않고 금 나노 입자의 제자리 합성에

Combinations of metal oxide semiconductors and gold nanoparticles (AuNPs) have been investigated as new types of materials. The in situ synthesis of AuNPs ...

in-situ-synthesis-gold-nanoparticles-without-aggregation-interlayer

Universidad San Sebastian

Research

JoVE Journal

Engineering

In Situ Synthesis of Gold Nanoparticles without Aggregation in the Interlayer Space of Layered Titanate Transparent Films

8.0K 조회수.  Niigata University.  여기서는 AuNPs의 응집이없는 티탄산 적층 필름의 층간 공간 내에서 금 나노 입자 (AuNPs)의 원위치에서의 합성을위한 프로토콜을 제시한다. 어떤 스펙트럼 변화도 사개월 후 관찰되지 않았다. 합성 된 물질은 촉매, 광촉매 및 경제적 플라즈몬 장치의 개발에 응용이 예상되었다. 

비디오: In Situ Synthesis of Gold Nanoparticles without Aggregation in the Interlayer Space of Layered Titanate Transparent Films

Template Directed Synthesis of Plasmonic Gold Nanotubes with Tunable IR Absorbance

A nearly parallel array of pores can be produced by anodizing aluminum foils in acidic environments1, 2. Applications of anodic aluminum oxide (AAO) membranes have been under development since the 1990's and have become a common method to template the synthesis of high aspect ratio nanostructures, mostly by electrochemical growth or pore-wetting. Recently, these membranes have become commercially available in a wide range of pore sizes and densities, leading to an extensive library of functional nanostructures being synthesized from AAO membranes. These include composite nanorods, nanowires and nanotubes made of metals, inorganic materials or polymers 3-10. Nanoporous membranes have been used to synthesize nanoparticle and nanotube arrays that perform well as refractive index sensors, plasmonic biosensors, or surface enhanced Raman spectroscopy (SERS) substrates 11-16, as well as a wide range of other fields such as photo-thermal heating 17, permselective transport 18, 19, catalysis 20, microfluidics 21, and electrochemical sensing 22, 23. Here, we report a novel procedure to prepare gold nanotubes in AAO membranes. Hollow nanostructures have potential application in plasmonic and SERS sensing, and we anticipate these gold nanotubes will allow for high sensitivity and strong plasmon signals, arising from decreased material dampening 15.

Solution-suspendable gold nanotubes with controlled dimensions can be synthesized by electrochemical deposition in porous anodic aluminum oxide (AAO) membranes using a hydrophobic polymer core. Gold nanotubes and nanotube arrays hold promise for applications in plasmonic biosensing, surface-enhanced Raman spectroscopy, photo-thermal heating, ionic and molecular transport, microfluidics, catalysis and electrochemical sensing.

템플릿 조정할 IR의 흡광도와 Plasmonic 골드 나노 튜브의 합성을 감독

A nearly parallel array of pores can be produced by anodizing aluminum foils in acidic environments1, 2. Applications of anodic aluminum oxide (AAO) ...

연구

화학

A Technique to Functionalize and Self-assemble Macroscopic Nanoparticle-ligand Monolayer Films onto Template-free Substrates

This protocol describes a self-assembly technique to create macroscopic monolayer films composed of ligand-coated nanoparticles1,2. The simple, robust and scalable technique efficiently functionalizes metallic nanoparticles with thiol-ligands in a miscible water/organic solvent mixture allowing for rapid grafting of thiol groups onto the gold nanoparticle surface. The hydrophobic ligands on the nanoparticles then quickly phase separate the nanoparticles from the aqueous based suspension and confine them to the air-fluid interface. This drives the ligand-capped nanoparticles to form monolayer domains at the air-fluid interface.&#160; The use of water-miscible organic solvents is important as it enables the transport of the nanoparticles from the interface onto template-free substrates.&#160; The flow is mediated by a surface tension gradient3,4 and creates macroscopic, high-density, monolayer nanoparticle-ligand films.&#160; This self-assembly technique may be generalized to include the use of particles of different compositions, size, and shape and may lead to an efficient assembly method to produce low-cost, macroscopic, high-density, monolayer nanoparticle films for wide-spread applications.

A simple, robust and scalable technique to functionalize and self-assemble macroscopic nanoparticle-ligand monolayer films onto template-free substrates is described in this protocol.

템플릿이없는 기판에 육안 나노 입자 - 리간드 단층 필름을 기능화 및 자기 조립 기술

This protocol describes a self-assembly technique to create macroscopic monolayer films composed of ligand-coated nanoparticles1,2. The simple, robust and ...

Synthesis, Assembly, and Characterization of Monolayer Protected Gold Nanoparticle Films for Protein Monolayer Electrochemistry

Colloidal gold nanoparticles protected with alkanethiolate ligands called monolayer protected gold clusters (MPCs) are synthesized and subsequently incorporated into film assemblies that serve as adsorption platforms for protein monolayer electrochemistry (PME). PME is utilized as the model system for studying electrochemical properties of redox proteins by confining them to an adsorption platform at a modified electrode, which also serves as a redox partner for electron transfer (ET) reactions. Studies have shown that gold nanoparticle film assemblies of this nature provide for a more homogeneous protein adsorption environment and promote ET without distance dependence compared to the more traditional systems modified with alkanethiol self-assembled monolayers (SAM).1-3 In this paper, MPCs functionalized with hexanethiolate ligands are synthesized using a modified Brust reaction4 and characterized with ultraviolet visible (UV-Vis) spectroscopy, transmission electron microscopy (TEM), and proton (1H) nuclear magnetic resonance (NMR). MPC films are assembled on SAM modified gold electrode interfaces by using a "dip cycle" method of alternating MPC layers and dithiol linking molecules. Film growth at gold electrode is tracked electrochemically by measuring changes to the double layer charging current of the system. Analogous films assembled on silane modified glass slides allow for optical monitoring of film growth and cross-sectional TEM analysis provides an estimated film thickness. During film assembly, manipulation of the MPC ligand protection as well as the interparticle linkage mechanism allow for networked films, that are readily adaptable, to interface with redox protein having different adsorption mechanism. For example, Pseudomonas aeruginosa azurin (AZ) can be adsorbed hydrophobically to dithiol-linked films of hexanethiolate MPCs and cytochrome c (cyt c) can be immobilized electrostatically at a carboxylic acid modified MPC interfacial layer. In this report, we focus on the film protocol for the AZ system exclusively. Investigations involving the adsorption of proteins on MPC modified synthetic platforms could further the understanding of interactions between biomolecules and man-made materials, and consequently aid the development of biosensor schemes, ET modeling systems, and synthetic biocompatible materials.5-8

Alkanethiolate stabilized gold colloids known as monolayer protected clusters (MPCs) are synthesized, characterized, and assembled into thin films as an adsorption interface for protein monolayer electrochemistry of simple redox protein like Pseudomonas aeruginosa azurin (AZ) and cytochrome c (cyt c).

Monolayer의 합성, 조립, 그리고 특성화는 단백질 Monolayer의 전기에 대한 골드 Nanoparticle 필름을 보호

Colloidal gold nanoparticles protected with alkanethiolate ligands called monolayer protected gold clusters (MPCs) are synthesized and subsequently ...

생체공학

Synthesis and Catalytic Performance of Gold Intercalated in the Walls of Mesoporous Silica

As a promising catalytically active nano reactor, gold nanoparticles intercalated in mesoporous silica (GMS) were successfully synthesized and properties of the materials were investigated. We used a one pot sol-gel approach to intercalate gold nano particles in the walls of mesoporous silica. To start with the synthesis, P123 was used as template to form micelles. Then TESPTS was used as a surface modification agent to intercalate gold nano particles. Following this process, TEOS was added in as a silica source which underwent a polymerization process in acid environment. After hydrothermal processing and calcination, the final product was acquired. Several techniques were utilized to characterize the porosity, morphology and structure of the gold intercalated mesoporous silica. The results showed a stable structure of mesoporous silica after gold intercalation. Through the oxidation of benzyl alcohol as a benchmark reaction, the GMS materials showed high selectivity and recyclability.

Here, we present a protocol with a sol-gel process to synthesize gold intercalated in the walls of mesoporous materials (GMS), which is confirmed to possess a mesoporous matrix with gold intercalated in the walls imparting great stability and recyclability.

합성과 메조 포러스 실리카의 벽에 금 층상의 촉매 성능

As a promising catalytically active nano reactor, gold nanoparticles intercalated in mesoporous silica (GMS) were successfully synthesized and properties ...

Gold Nanostar Synthesis with a Silver Seed Mediated Growth Method

The physical, chemical and optical properties of nano-scale colloids depend on their material composition, size and shape 1-5. There is a great interest in using nano-colloids for photo-thermal ablation, drug delivery and many other biomedical applications 6. Gold is particularly used because of its low toxicity 7-9. A property of metal nano-colloids is that they can have a strong surface plasmon resonance 10. The peak of the surface plasmon resonance mode depends on the structure and composition of the metal nano-colloids. Since the surface plasmon resonance mode is stimulated with light there is a need to have the peak absorbance in the near infrared where biological tissue transmissivity is maximal 11, 12.
We present a method to synthesize star shaped colloidal gold, also known as star shaped nanoparticles 13-15 or nanostars 16. This method is based on a solution containing silver seeds that are used as the nucleating agent for anisotropic growth of gold colloids 17-22. Scanning electron microscopy (SEM) analysis of the resulting gold colloid showed that 70 % of the nanostructures were nanostars. The other 30 % of the particles were amorphous clusters of decahedra and rhomboids. The absorbance peak of the nanostars was detected to be in the near infrared (840 nm). Thus, our method produces gold nanostars suitable for biomedical applications, particularly for photo-thermal ablation.

We synthesized star shaped gold nanostars using a silver seed mediated growth method. The diameter of the nanostars ranges from 200 to 300 nm and the number of tips vary from 7 to 10. The nanoparticles have a broad surface plasmon resonance mode centered in the near infrared.

실버 씨앗 중재 성장 방법과 골드 Nanostar 합성

The physical, chemical and optical properties of nano-scale colloids depend on their material composition, size and shape 1-5. There is a great interest ...

Synthesis and Reaction Chemistry of Nanosize Monosodium Titanate

This paper describes the synthesis and peroxide-modification of nanosize monosodium titanate (nMST), along with an ion-exchange reaction to load the material with Au(III) ions. The synthesis method was derived from a sol-gel process used to produce micron-sized monosodium titanate (MST), with several key modifications, including altering reagent concentrations, omitting a particle seed step, and introducing a non-ionic surfactant to facilitate control of particle formation and growth. The resultant nMST material exhibits spherical-shaped particle morphology with a monodisperse distribution of particle diameters in the range from 100 to 150&#160;nm. The nMST material was found to have a Brunauer-Emmett-Teller (BET) surface area of 285 m2g-1, which is more than an order of magnitude higher than the micron-sized MST. The isoelectric point of the nMST measured 3.34 pH units, which is a pH unit lower than that measured for the micron-size MST. The nMST material was found to serve as an effective ion exchanger under weakly acidic conditions for the preparation of an Au(III)-exchange nanotitanate. In addition, the formation of the corresponding peroxotitanate was demonstrated by reaction of the nMST with hydrogen peroxide.

The surfactant mediated sol-gel synthesis of nanosized monosodium titanate is described, along with preparation of the corresponding peroxide modified material. An ion-exchange reaction with Au(III) is also presented.

This paper describes the synthesis and peroxide-modification of nanosize monosodium titanate (nMST), along with an ion-exchange reaction to load the ...

A Simple Method for the Size Controlled Synthesis of Stable Oligomeric Clusters of Gold Nanoparticles under Ambient Conditions

Reducing dilute aqueous HAuCl4 with sodium thiocyanate (NaSCN) under alkaline conditions produces 2 to 3 nm diameter nanoparticles. Stable grape-like oligomeric clusters of these yellow nanoparticles of narrow size distribution are synthesized under ambient conditions via two methods. The delay-time method controls the number of subunits in the oligoclusters by varying the time between the addition of HAuCl4 to alkaline solution and the subsequent addition of reducing agent, NaSCN. The yellow oligoclusters produced range in size from ~3 to ~25 nm. This size range can be further extended by an add-on method utilizing hydroxylated gold chloride (Na+[Au(OH4-x)Clx]-) to auto-catalytically increase the number of subunits in the as-synthesized oligocluster nanoparticles, providing a total range of 3 nm to 70 nm. The crude oligocluster preparations display narrow size distributions and do not require further fractionation for most purposes. The oligoclusters formed can be concentrated &#62;300 fold without aggregation and the crude reaction mixtures remain stable for weeks without further processing. Because these oligomeric clusters can be concentrated before derivatization they allow expensive derivatizing agents to be used economically. In addition, we present two models by which predictions of particle size can be made with great accuracy.

We describe a simple method for producing highly stable oligomeric clusters of gold nanoparticles via the reduction of chloroauric acid (HAuCl4) with sodium thiocyanate (NaSCN). The oligoclusters have a narrow size distribution and can be produced with a wide range of sizes and surface coats.

주변 조건에 따라 금 나노 입자의 안정 올리고머 클러스터의 크기 제어 합성을위한 간단한 방법

Reducing dilute aqueous HAuCl4 with sodium thiocyanate (NaSCN) under alkaline conditions produces 2 to 3 nm diameter nanoparticles. Stable grape-like ...

Large Area Substrate-Based Nanofabrication of Controllable and Customizable Gold Nanoparticles Via Capped Dewetting

Recent scientific advances in the utilization of metallic nanoparticle for enhanced energy conversion efficiency, improved optical device performance, and high-density data storage have demonstrated the potential benefit of their use in industrial applications. These applications require precise control over nanoparticle size, spacing, and sometimes shape. These requirements have resulted in the use of time and cost intensive processing steps to produce nanoparticles, thus making the transition to industrial application unrealistic. This protocol will resolve this issue by providing a scalable and affordable method for the large-area production of nanoparticle films with improved nanoparticle control compared to the current techniques. In this article, the process will be demonstrated with gold, but other metals can also be used.

This protocol details a novel nano-manufacturing technique that can be used to make controllable and customizable nanoparticle films over large areas based on the self-assembly of dewetting of capped metal films.

큰 면적 기판 기반 Nanofabrication 출장 Dewetting 통해 제어 하 고 사용자 정의 금 나노 입자의

Recent scientific advances in the utilization of metallic nanoparticle for enhanced energy conversion efficiency, improved optical device performance, and ...

공학

Growth of Gold Dendritic Nanoforests on Titanium Nitride-coated Silicon Substrates

In this study, a high-power impulse magnetron sputtering system is used to coat a flat and firm titanium nitride (TiN) film on silicon (Si) wafers, and a fluoride-assisted galvanic replacement reaction (FAGRR) is employed for the rapid and easy deposition of gold dendritic nanoforests (Au DNFs) on the TiN/Si substrates. Scanning electron microscopy (SEM) images and energy-dispersive X-ray spectroscopy patterns of TiN/Si and Au DNFs/TiN/Si samples validate that the synthesis process is accurately controlled. Under the reaction conditions in this study, the thickness of the Au DNFs increases linearly to 5.10 &#177; 0.20 &#181;m within 15 min of the reaction. Therefore, the employed synthesis procedure is a simple and rapid approach for preparing Au DNFs/TiN/Si composites.

This study presents a feasible procedure for synthesizing gold dendritic nanoforests on titanium nitride/silicon substrates. The thickness of gold dendritic nanoforests increases linearly within 15 min of a synthesis reaction.

질 화 티타늄 코팅 된 실리콘 기질에 대 한 금 수지상 나노 숲의 성장

In this study, a high-power impulse magnetron sputtering system is used to coat a flat and firm titanium nitride (TiN) film on silicon (Si) wafers, and a ...

Gold Nanoparticle Synthesis

Gold nanoparticles (Au nanoparticles) that are ~12 nm in diameter were synthesized by rapidly injecting a solution of 150 mg (0.15 mmol) of tetrachloroauric acid in 3.0 g (3.7 mmol, 3.6 mL) of oleylamine (technical grade) and 3.0 mL of toluene into a boiling solution of 5.1 g (6.4 mmol, 8.7 mL) of oleylamine in 147 mL of toluene. While boiling and mixing the reaction solution for 2 hours, the color of the reaction mixture changed from clear, to light yellow, to light pink, and then slowly to dark red. The heat was then turned off, and the solution was allowed to gradually cool down to room temperature for 1 hour. The gold nanoparticles were then collected and separated from the solution using a centrifuge and washed three times; by vortexing and dispersing the gold nanoparticles in 10 mL portions of toluene, and then precipitating the gold nanoparticles by adding 40 mL portions of methanol and spinning them in a centrifuge. The solution was then decanted to remove any remaining byproducts and unreacted starting materials. Drying the gold nanoparticles in a vacuum environment produced a solid black pellet; which could be stored for long periods of time (up to one year) for later use, and then redissolved in organic solvents such as toluene.

A protocol for synthesizing ~12 nm diameter gold nanoparticles (Au nanoparticles) in an organic solvent is presented. The gold nanoparticles are capped with oleylamine ligands to prevent agglomeration. The gold nanoparticles are soluble in organic solvents such as toluene.