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LSPR Tuning from 470 to 800 nm and Improved Stability of Au–Ag Nanoparticles Formed by Gold Deposition and Rebuilding in the Presence of Poly(styrenesulfonate)
Langmuir ( IF 3.7 ) Pub Date : 2018-01-05 00:00:00 , DOI: 10.1021/acs.langmuir.7b03537 Nicole Cathcart 1 , Jennifer I. L. Chen 2 , Vladimir Kitaev 1
Langmuir ( IF 3.7 ) Pub Date : 2018-01-05 00:00:00 , DOI: 10.1021/acs.langmuir.7b03537 Nicole Cathcart 1 , Jennifer I. L. Chen 2 , Vladimir Kitaev 1
Affiliation
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Stability and precise control over functional properties of metal nanoparticles remain a challenge for the realization of prospective applications. Our described process of shell formation and rebuilding can address both these challenges. Template silver nanoparticles (AgNPs) stabilized by poly(styrenesulfonate) are first transformed with gold deposition, after which the resulting shell rebuilds with the replaced silver. The shell formation and rebuilding are accompanied by large shifts in localized surface plasmon resonance (LSPR) peak position, which enables LSPR tuning in a range from 470 to 800 nm. Furthermore, chemical stability of Au–AgNPs is significantly improved compared to AgNPs due to gold stability. Silver templates of different shapes and sizes were demonstrated to transform to AuAg composite NPs to further extend the accessible LSPR range tuning. Stabilization of template AgNPs with poly(styrenesulfonate), in contrast to commonly used poly(vinylpyrrolidone), was found to be a key factor for shell rebuilding. The developed Au–AgNPs were shown to be advantageous for surface plasmon resonance (SPR) detection and surface-enhanced Raman spectroscopy (SERS) owing to their tunable LSPR and enhanced stability.
中文翻译：
在聚苯乙烯磺酸盐的存在下，从470到800 nm的LSPR调谐和改进的金沉积和重建形成的Au-Ag纳米颗粒的稳定性
金属纳米颗粒的功能特性的稳定性和精确控制仍然是实现预期应用的挑战。我们描述的壳形成和重建过程可以解决这两个挑战。首先，用聚（苯乙烯磺酸盐）稳定的模板银纳米颗粒（AgNP）进行金沉积转化，然后生成的壳将被替换的银重建。壳的形成和重建伴随着局部表面等离振子共振（LSPR）峰值位置的大偏移，这使LSPR的调谐范围在470至800 nm之间。此外，由于金的稳定性，与AgNPs相比，Au-AgNPs的化学稳定性得到了显着改善。演示了不同形状和大小的银模板可以转化为AuAg复合NP，以进一步扩展可访问的LSPR范围调整。与常用的聚（乙烯基吡咯烷酮）相反，用聚（苯乙烯磺酸盐）稳定模板AgNPs是壳重建的关键因素。由于其可调的LSPR和增强的稳定性，开发的Au-AgNPs被证明对表面等离振子共振（SPR）检测和表面增强拉曼光谱（SERS）具有优势。
更新日期：2018-01-05
中文翻译：
在聚苯乙烯磺酸盐的存在下，从470到800 nm的LSPR调谐和改进的金沉积和重建形成的Au-Ag纳米颗粒的稳定性
金属纳米颗粒的功能特性的稳定性和精确控制仍然是实现预期应用的挑战。我们描述的壳形成和重建过程可以解决这两个挑战。首先，用聚（苯乙烯磺酸盐）稳定的模板银纳米颗粒（AgNP）进行金沉积转化，然后生成的壳将被替换的银重建。壳的形成和重建伴随着局部表面等离振子共振（LSPR）峰值位置的大偏移，这使LSPR的调谐范围在470至800 nm之间。此外，由于金的稳定性，与AgNPs相比，Au-AgNPs的化学稳定性得到了显着改善。演示了不同形状和大小的银模板可以转化为AuAg复合NP，以进一步扩展可访问的LSPR范围调整。与常用的聚（乙烯基吡咯烷酮）相反，用聚（苯乙烯磺酸盐）稳定模板AgNPs是壳重建的关键因素。由于其可调的LSPR和增强的稳定性，开发的Au-AgNPs被证明对表面等离振子共振（SPR）检测和表面增强拉曼光谱（SERS）具有优势。
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