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首页> 外文期刊>RSC Advances >Surface-enhanced Raman scattering-active desert-rose-like Ag mesoparticles prepared using cyclic voltammetric methods
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Surface-enhanced Raman scattering-active desert-rose-like Ag mesoparticles prepared using cyclic voltammetric methods

机译：使用循环伏安法制备的表面增强拉曼散射活性沙漠玫瑰状银中观粒子

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摘要

Desert-rose-like Ag mesoparticles were deposited on a screen-printed carbon electrode substrate through a cyclic voltammetric process in aqueous AgNO3 containing Au nanoparticles. The prepared mesoparticles were characterized using scanning electron microscopy, energy dispersive X-ray spectroscopy, surface-assisted laser desorption/ionization mass spectrometry, X-ray photoelectron spectroscopy, and high-resolution X-ray diffractometry. In addition, the potential for applying these mesoparticles in surface-enhanced Raman scattering (SERS) was investigated. The prepared mesoparticles exhibited a more intense SERS signal (34.3 times) than did irregularly shaped Ag particles because of their extremely intense local electromagnetic fields. The enhancement factor of 4-mercaptobenzoic acid molecules on these mesoparticles was approximately 10(5). Furthermore, SERS spectra of 4,4'-dimercapto-azobenzene, 5,5'-dithiobis-2-nitrobenzoic acid, and Cy3 dye modified DNA were obtained using these mesoparticles; moreover, hot spots for most of the enhanced SERS signals were easily obtained. The thermal stability and aging behaviour of the prepared Ag mesoparticles were higher than those of irregularly shaped Ag particles.
机译：通过循环伏安法在含有Au的AgNO3水溶液中，将沙漠玫瑰般的Ag介孔颗粒沉积在丝网印刷的碳电极基材上。使用扫描电子显微镜，能量色散X射线光谱，表面辅助激光解吸/电离质谱，X射线光电子能谱和高分辨率X射线衍射法对制得的介观粒子进行表征。此外，还研究了将这些中粒子应用于表面增强拉曼散射（SERS）的潜力。与不规则形状的Ag颗粒相比，所制备的中观颗粒表现出更强的SERS信号（34.3倍），因为它们具有极强的局部电磁场。这些介孔颗粒上的4-巯基苯甲酸分子的增强因子约为10（5）。此外，使用这些介孔粒子获得了4,4'-二巯基-偶氮苯，5,5'-二硫代双-2-硝基苯甲酸和Cy3染料修饰的DNA的SERS光谱。此外，很容易获得大多数增强型SERS信号的热点。所制备的Ag介孔颗粒的热稳定性和老化行为高于不规则形状的Ag颗粒。

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