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Ternary Silver Halide Nanocrystals
Accounts of Chemical Research ( IF 16.4 ) Pub Date : 2017-06-27 00:00:00 , DOI: 10.1021/acs.accounts.7b00194 Sasitha C. Abeyweera 1 , Kowsalya D. Rasamani 1 , Yugang Sun 1
Accounts of Chemical Research ( IF 16.4 ) Pub Date : 2017-06-27 00:00:00 , DOI: 10.1021/acs.accounts.7b00194 Sasitha C. Abeyweera 1 , Kowsalya D. Rasamani 1 , Yugang Sun 1
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Nanocrystalline silver halides (AgX) such as AgCl, AgBr, and AgI, a class of semiconductor materials with characteristics of both direct and indirect band gaps, represent the most crucial components in traditional photographic processing. The nanocrystal surfaces provide sensitivity specks that can turn into metallic silver, forming an invisible latent image, upon exposure to light. The photographic processing implies that the AgX nanoparticles possess unique properties. First, pristine AgX nanoparticles absorb light only at low efficiency to convert surface AgX into tiny clusters of silver atoms. Second, AgX nanoparticles represent an excellent class of materials to capture electrons efficiently. Third, small metallic silver clusters can catalyze the reduction of AgX nanoparticles to Ag nanoparticles in the presence of mild reducing reagents, known as self-catalytic reduction. These properties indicate that AgX nanoparticles can be partially converted to metallic silver with high precision, leading to the formation of hybrid AgX/Ag nanoparticles. The nanosized metallic Ag usually exhibit intense absorption bands in the visible spectral region due to their strong surface plasmon resonances, which make the AgX/Ag nanoparticles a class of promising visible-light-driven photocatalysts for environmental remediation and CO2 reduction. Despite the less attention paid to their ability of capturing electrons, AgX nanoparticles might be a class of ideal electron shuttle materials to bridge light absorbers and catalysts on which electrons can drive chemical transformations.
中文翻译：
三元卤化银纳米晶体
诸如AgCl，AgBr和AgI之类的纳米晶卤化银（AgX）是一类具有直接和间接带隙特征的半导体材料，是传统照相处理中最关键的组成部分。纳米晶体表面提供了敏感性斑点，当暴露于光线下时，斑点会变成金属银，形成不可见的潜像。摄影处理表明AgX纳米粒子具有独特的性能。首先，原始的AgX纳米粒子仅以低效率吸收光，从而将表面的AgX转化为银原子的微小簇。其次，AgX纳米粒子代表了一类优秀的材料，可以有效地捕获电子。第三，在温和的还原剂存在下，小的金属银簇可以催化将AgX纳米颗粒还原为Ag纳米颗粒，称为自催化还原。这些性质表明，AgX纳米颗粒可以高精度地部分转化为金属银，从而导致混合AgX / Ag纳米颗粒的形成。纳米金属Ag由于其强大的表面等离子体共振，通常在可见光谱区域表现出很强的吸收带，这使AgX / Ag纳米颗粒成为一类有前途的可见光驱动的光催化剂，可用于环境修复和CO2减少。尽管很少关注它们捕获电子的能力，但AgX纳米粒子可能是一类理想的电子穿梭材料，可桥接电子可在其上驱动化学转化的光吸收剂和催化剂。
更新日期：2017-06-27
中文翻译：
三元卤化银纳米晶体
诸如AgCl，AgBr和AgI之类的纳米晶卤化银（AgX）是一类具有直接和间接带隙特征的半导体材料，是传统照相处理中最关键的组成部分。纳米晶体表面提供了敏感性斑点，当暴露于光线下时，斑点会变成金属银，形成不可见的潜像。摄影处理表明AgX纳米粒子具有独特的性能。首先，原始的AgX纳米粒子仅以低效率吸收光，从而将表面的AgX转化为银原子的微小簇。其次，AgX纳米粒子代表了一类优秀的材料，可以有效地捕获电子。第三，在温和的还原剂存在下，小的金属银簇可以催化将AgX纳米颗粒还原为Ag纳米颗粒，称为自催化还原。这些性质表明，AgX纳米颗粒可以高精度地部分转化为金属银，从而导致混合AgX / Ag纳米颗粒的形成。纳米金属Ag由于其强大的表面等离子体共振，通常在可见光谱区域表现出很强的吸收带，这使AgX / Ag纳米颗粒成为一类有前途的可见光驱动的光催化剂，可用于环境修复和CO2减少。尽管很少关注它们捕获电子的能力，但AgX纳米粒子可能是一类理想的电子穿梭材料，可桥接电子可在其上驱动化学转化的光吸收剂和催化剂。
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