Homogeneously-Alloyed Gold–Silver Nanoparticles as per Feeding Moles
Homogeneously-Alloyed Gold–Silver Nanoparticles as per Feeding Moles
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DOI：
10.1021/jp512528j
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发表时间：
2015-02
影响因子：
3.7
通讯作者：
Ranguwar Rajendra;Parnika Bhatia;A. Justin;Shilpy Sharma;N. Ballav
中科院分区：
文献类型：
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作者：
Ranguwar Rajendra;Parnika Bhatia;A. Justin;Shilpy Sharma;N. Ballav
涉及 HAuCl4 和 AgNO3 共还原的湿化学方法已被证明特别适合生产具有可控结构-性能关系的稳定的金银合金纳米颗粒。然而，AgCl 在水介质中的溶解度非常差，并且 Au 和 Ag 本质上不同的表面能仍然是合成高于 AgCl 溶解度积的所谓“合金”纳米颗粒的不利因素。在这里，我们报告了一种强大的共还原程序，用于在室温下生产平均尺寸低于 10 nm 的柠檬酸盐稳定的“均质合金化”Au-Ag NP，同时通过简单的试剂 NH4OH 克服有害因素。该合金纳米颗粒具有高度结晶度、成分可调的表面等离子体共振（SPR）行为、受控催化、生物相容性、表面增强拉曼散射（SERS）活性和高化学稳定性。该合金纳米颗粒可以承受腐蚀性化学环境，并且很容易从水介质转移到各种有机介质...
Wet-chemical methods involving the coreduction of HAuCl4 and AgNO3 have been proven particularly suitable for producing stable Au–Ag alloy NPs with controllable structure–property relationship. However, very poor-solubility of AgCl in aqueous medium and intrinsically different surface energies of Au and Ag remained detrimental-factors in synthesizing so-called “alloy” NPs above the solubility-product of AgCl. Here, we report a robust coreduction procedure for producing citrate-stabilized “homogeneously alloyed” Au–Ag NPs of average size sub-10 nm at room-temperature upon simultaneously overcoming the detrimental factors by a simple reagent NH4OH. The alloy NPs revealed a high-degree of crystallinity, composition-tunable surface plasmon resonance (SPR) behavior, controlled-catalysis, biocompatibility, surface enhance Raman scattering (SERS) activity and high-chemical stability. The alloy NPs could withstand corrosive chemical environment and be easily transferred from aqueous medium to various organic medi...