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首页> 外文期刊>Journal of nano research >Scrutiny of Surface Plasmon Resonance Bands of Colloidal Cu and Cu-Ag Nanoparticles in Different Reaction Media for Stability Evaluation
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Scrutiny of Surface Plasmon Resonance Bands of Colloidal Cu and Cu-Ag Nanoparticles in Different Reaction Media for Stability Evaluation

机译：考察不同反应介质中胶体Cu和Cu-Ag纳米粒子表面等离子体共振带的稳定性

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The copper nanoparticles (CuNPs) were developed in two different reaction media (distilled water (DW) and ethylene glycol (EG)) by chemical reduction method using two different stabilizers (polyethylene glycol (PEG) and polyvinyl pyrrolidone (PVP)). We carried out a careful examination of the time evolution of surface plasmon resonance (SPR) bands (specifically, peak positions and intensities) of colloidal CuNPs so as to evaluate their stability. In addition, the changing pattern of SPR peak positions and intensities during the stability time period was also investigated. Effects of stabilizer materials, stabilizer concentration, Ag capping and reaction medium on the stability of CuNPs colloids have been highlighted. The maximum stability of CuNPs is 4 hours with stabilizer PEG and is 4 days with PVP in DW. They, with PVP, extend up to 10 days in the different reaction medium (EG). The stability time of CuNPs in EG is further lengthened to 20 days in the presence of Ag capping (Cusubcore/sub Agsubshell/subNPs). Thus a proper selection of the stabilizing/capping agent and the reaction medium is critical in determining the stability of CuNPs colloids. The benefits of stabilization of CuNPs for real world applications are immense and this study would help in examinning the stability of other novel plasmonic metal nanostructures.
机译：使用两种不同的稳定剂（聚乙二醇（PEG）和聚乙烯吡咯烷酮（PVP））通过化学还原法在两种不同的反应介质（蒸馏水（DW）和乙二醇（EG））中开发了铜纳米颗粒（CuNPs）。我们对胶体CuNPs的表面等离振子共振（SPR）带的时间演化（特别是峰位置和强度）进行了仔细检查，以评估其稳定性。此外，还研究了稳定时间段内SPR峰位置和强度的变化模式。重点介绍了稳定剂材料，稳定剂浓度，Ag封端和反应介质对CuNPs胶体稳定性的影响。 CuNPs的最大稳定性在稳定剂PEG中为4小时，在PW中为PVP为4天。它们具有PVP，在不同的反应介质（EG）中可长达10天。在存在Ag封端（Cu 核心 Ag 壳 NPs）的情况下，CuNPs在EG中的稳定时间进一步延长至20天。因此，稳定剂/封端剂和反应介质的正确选择对于确定CuNPs胶体的稳定性至关重要。稳定CuNPs在现实世界中应用的好处是巨大的，这项研究将有助于检验其他新型等离子体金属纳米结构的稳定性。

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