第35卷，第10期 2015年10
光谱学与光谱分析 Spectroscopy and Spectral Analysis
Vol.35,No.10 -pp2952-2957
October,2015
Preparation and SERS Study of Silver Microstructures
withDendriticShape
ZHANG Xiao-tong,ZHAO Chun-liu,ZHOUYu-meng, DONGQian-min,LANGTing-ting,JINShang-zhong
College of Optical and Electronic Technology , China Jiliang University , Hangzhou 310018, China
Abstract In the surface ehanced Raman scattering (SERS) technology, not only to improve the making process of SERS substrates , to be fast and easily , but also to enhance the SERS enhance factor, an easy re-placement reaction between zinc and silver nitrate solution has been adopted to prepare silver micro-structures SERS-active substrate . The silver micro-substrates have many advantages . These substrates have good stabili-ty , well preservation , an easy making method and a fast making process . The surface profile of the silver mi-croparticles is investigated by scanning electron microscope (SEM ). The silver microstructures are dendritic shape in a symmetrical fashion with symmetrical distribution . When the time of the replace reaction is 40 , 50 and 60 s , respectively , the average lengths of “trunks" in the silver dendritic microsubstractes are about 3 , 5 and 10 μm , and the lengths of the “branches" are about 700 nm , 2 μm and 3 μm , respectively . The result show s that the longer time the replacement reaction takes , the longer lengths of the “trunks" and "branches" in the silver dendritic microsubstractes become . With the time of replace reaction increasing , the "trunk" and"branch" in the silver dendritic microsubstractes grow longer and a large amount of nano-level "leaves" grow out from the “branches" of the silver dendritic microsubstractes , so the silver micro size dendrates have nano level structure on surface. In order to investigate the SERS-active substrates application in SERS , a Fourier transform Raman spectrograph with a l 064 nm laser wavelength is used to measure the SERS spectra . And good SERS spectra have been obtained by using dendritic silver microsubstrates on the silicon chip as a SERS substract , and Rhodamine 6G (R6G) as a molecule probe . It is found that the silver micro-substrates have good Raman characteristics . And comparing these SERS spectra , it gets the conclution that the spectra with best SERS enhance effect are obtained when R6G is obsorbed on the silver dendritic micro-substractes whose preparing time is 40s, and at that time, the analytical enhancement factor for SERS signals is approximately 1o° . And when the silicon ships are dealed with surfactants Polyvinylpyrrolidone (PVP) and keeping the other conditions the same as before, the SERS enhance effect of the spectra becomes better , and the enhancement factor turn to be approximately 1o' . What's more , the silver microstructures can be preserved several monthes under deionized water and the repeatment of the expriment result is well in general .
KeywordsSilver microsubstrates ; Silver microsubstrates ; SERS; R6G; Surfactant; Displacement reaction ; Enhancement factor
中图分类号：0657.3
文献标识码：A
Received : 2014-07-11 ; accepted: 2014-12-20
DOI:10.3964/j.issn.1000-0593(2015)10-2952-06
Foundation item:; the International Technological Cooperation Program of Zhejiang (China )(2013C24018 ) , the National Natural Science Foun-
dation of China (NSFC )(61108058)
Biography : ZHANG Xiao-tong , (1989—), female , Master student in College of Optical and Electronic Technology , China Jiliang University
* Corresponding author
e-mail : clzhad@ ejlu -edu .en