Electrochemical Synthesis and Deposition of Surface-Enhanced Raman Scattering-Active Silver Microstructures on a Screen-Printed Carbon Electrode
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- 作者：Yang-Wei Lin ; Chung Tang
- 刊名：Journal of Physical Chemistry C
- 出版年：2015
- 出版时间：November 5, 2015
- 年：2015
- 卷：119
- 期：44
- 页码：24865-24874
- 全文大小：634K
- ISSN：1932-7455
文摘
We demonstrated a series of Ag microstructures with controlled morphologies directly deposited on a screen-printed carbon electrode by using electrochemical procedures in the presence of different electrolytes. Scanning electron microscopy, transmission electron microscopy, energy-dispersive X-ray spectroscopy, and high-resolution X-ray diffractometry were used for characterizing as-prepared Ag substrates. Thereafter, the potential of the flower-like Ag microstructures for use in surface-enhanced Raman scattering (SERS) applications was investigated. The flower-like Ag microstructures provided a more intense SERS signal because of extremely intense local electromagnetic fields. The enhancement factor value was approximately 1.2 脳 106 for 4-mercaptobenzoic acid molecules. The percentage of relative standard deviation of SERS signals was lower than 2.1%. Determining the SERS spectra of 4,4鈥?dimercapto-azobenzene, 5,5鈥?dithiobis-2-nitrobenzoic acid, adenine, and single-stranded DNA (fumarylacetoacetate hydrolase gene) was straightforward. Furthermore, the thermal stability and aging behavior of the microstructures were improved. The present substrate fabrication process is facile and has excellent SERS-active properties and reproducibility and thus provides opportunities for quantitative analysis by using flower-like Ag microstructures.