Gold in a Metallic Divided State—From Faraday to Present‐Day Nanoscience

Edwards, Peter P.; Thomas, John Meurig

doi:10.1002/anie.200700428

Cited by 171 publications

(90 citation statements)

References 64 publications

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“…Whereas bulk gold is a symbol of chemical inertness (2), many following studies have confirmed the size-dependent reactivity of deposited gold clusters (3)(4)(5)(6). Small particles of gold differ from the bulk as they contain edge atoms that have low coordination (7) and can adopt binding geometries which lead to a more reactive electronic structure (8).…”

mentioning

confidence: 99%

Structures of Neutral Au ₇ , Au ₁₉ , and Au ₂₀ Clusters in the Gas Phase

Gruene

Rayner

Redlich

et al. 2008

Science

560

487

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The catalytic properties of gold nanoparticles are determined by their electronic and geometric structures. We revealed the geometries of several small neutral gold clusters in the gas phase by using vibrational spectroscopy between 47 and 220 wavenumbers. A two-dimensional structure for neutral Au 7 and a pyramidal structure for neutral Au 20 can be unambiguously assigned. The reduction of the symmetry when a corner atom is cut from the tetrahedral Au 20 cluster is directly reflected in the vibrational spectrum of Au 19 .

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mentioning

confidence: 99%

Structures of Neutral Au ₇ , Au ₁₉ , and Au ₂₀ Clusters in the Gas Phase

Gruene

Rayner

Redlich

et al. 2008

Science

560

487

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“…11,12 Deste então, o interesse nestas NPs tem aumentado e novas metodologias de síntese e caracterização têm sido desenvolvidas, possibilitando grande controle de tamanho e formato. [13][14][15] A pesquisa nesta área foi enriquecida pela compreensão do efeito da ressonância de plasmon de superfície localizado (LSPR), que explica o comportamento óptico destes materiais. Mie foi o primeiro a elucidar a origem das cores nestas estruturas e sua teoria foi posteriormente complementada com os modelos de Maxwell-Garnett que explicavam a interação de NPs-M com o meio.…”

Section: Introductionunclassified

Ressonância de plasmon de superfície localizado e aplicação em biossensores e células solares

Santos¹,

Santos²,

Thesing³

et al. 2016

Quim. Nova

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LOCALIZED SURFACE PLASMON RESSONANCE APPLIED TO BIOSENSORS AND SOLAR CELLS. Within the last decades, the research on nanoparticles presenting localized surface plasmon resonance has increased constantly. In these materials, the interaction between electrons and incident light results in charge separation, enhancement of the electromagnetic field on the nanoparticles surface and in unique optical properties. Although many metals such as gold, silver, copper and aluminum present localized surface plasmon resonance within the visible range, gold and silver are the most commonly studied metals, due to the chemical inertia of gold and intense plasmon resonance from silver. In this review, we provide a description of the origin of localized surface plasmon resonance through the works developed by Mie, Maxwell and Maxwell-Garnett and a description of many examples of application of plasmonic nanoparticles on biosensors and solar cells, detailing the contribution of these plasmonic nanoparticles on the performance of these devices.Keywords: LSPR; Localized Surface Plasmon Resonance; biosensor; solar cell. INTRODUÇÃONos últimos 20 anos o interesse por nanopartículas metálicas (NPs-M) tem aumentado constantemente devido a sua ampla variedade de aplicações.1-8 Vários grupos de pesquisa têm estudado desde nanopartículas isoladas de cerca de 1 nm até nanopartículas de centenas de nanômetros, assim como seus aglomerados, buscando entender seu comportamento óptico e catalítico. Adicionalmente, a literatura descreve a constante busca por metodologias de síntese cada vez mais simples, de baixo custo e com alta reprodutibilidade. O comportamento óptico de nanopartículas metálicas tem fascinado a humanidade há vários séculos através de obras de arte, mesmo antes que a palavra nanotecnologia fosse utilizada.9 Um dos exemplos mais conhecidos é a Taça de Lycurgus (século 4 d.C), que tem em sua composição nanopartículas de ouro (NPAu).10 No entanto, foi somente em 1857 que as NPs-M receberam maior atenção devido aos estudos de Michael Faraday sobre o efeito da interação da luz em uma solução coloidal de NPAu obtida através da redução do cloreto de ouro pelo fósforo.11,12 Deste então, o interesse nestas NPs tem aumentado e novas metodologias de síntese e caracterização têm sido desenvolvidas, possibilitando grande controle de tamanho e formato.13-15 A pesquisa nesta área foi enriquecida pela compreensão do efeito da ressonância de plasmon de superfície localizado (LSPR), que explica o comportamento óptico destes materiais. Mie foi o primeiro a elucidar a origem das cores nestas estruturas e sua teoria foi posteriormente complementada com os modelos de Maxwell-Garnett que explicavam a interação de NPs-M com o meio. Estes estudos proporcionaram uma ampla visão quanto as possíveis aplicações das NPs-M, sendo atualmente empregada no desenvolvimento de novos materiais como células solares, biossensores e catalisadores. Nesta revisão, serão abordados os embasamentos teóricos envolvidos no efeito LSPR de NPs-M, destacando a aplicação destas n...

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“…In the past, large pieces of materials coloured by gold nanoparticles have been realized; one can cite the famous Lycurgus Cup (400 AD) [14][15][16] or the stained glass of the Cathédrale Notre Dame de Paris [17][18][19] (France). These pieces were realized by master glassmakers using gold salts.…”

Section: Introductionmentioning

confidence: 99%

New deeply coloured 18-K gold materials built by nanotechnologies

Serin¹,

Bourlion²,

Diologent

et al. 2014

Gold Bull

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A new way to elaborate coloured carat gold materials has been developed. Instead of using traditional metallurgy route, we built a new 18-K bulk material using nanostructured gold particles. The resulting colour is the consequence of a well-known property of gold nanoparticles: the surface plasmon resonance effect. Depending on the chemical environment around the nanoparticles, their shape and size, it is possible to tune the colour of gold. Thanks to this property, it is possible to obtain a large panel of colours not achievable via conventional alloying route. Here, we focus on one hybrid nanostructured material: Au-SiO 2 . The development of a new synthesis route enables us to obtain nanostructured micrometric powders that can then be pressed to obtain a bulk material. The resulting nanocomposites are characterized by means of energy-dispersive X-ray spectroscopy (EDX), fire assay, TEM and spectrophotocolorimetry. All these characterizations have shown that our composites exhibit a gold content superior to 75 % by weight and have a much more vivid colour than classical coloured gold. The new composites are therefore deeply coloured 18-K materials.

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Gold in a Metallic Divided State—From Faraday to Present‐Day Nanoscience

Cited by 171 publications

References 64 publications

Structures of Neutral Au ₇ , Au ₁₉ , and Au ₂₀ Clusters in the Gas Phase

Structures of Neutral Au ₇ , Au ₁₉ , and Au ₂₀ Clusters in the Gas Phase

Ressonância de plasmon de superfície localizado e aplicação em biossensores e células solares

New deeply coloured 18-K gold materials built by nanotechnologies

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Gold in a Metallic Divided State—From Faraday to Present‐Day Nanoscience

Cited by 171 publications

References 64 publications

Structures of Neutral Au 7 , Au 19 , and Au 20 Clusters in the Gas Phase

Structures of Neutral Au 7 , Au 19 , and Au 20 Clusters in the Gas Phase

Ressonância de plasmon de superfície localizado e aplicação em biossensores e células solares

New deeply coloured 18-K gold materials built by nanotechnologies

Contact Info

Product

Resources

About

Structures of Neutral Au ₇ , Au ₁₉ , and Au ₂₀ Clusters in the Gas Phase

Structures of Neutral Au ₇ , Au ₁₉ , and Au ₂₀ Clusters in the Gas Phase