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题目:

Two-step-route to Ag-Au nanoparticles grafted on Ge wafer for extra-uniform SERS substrates

 

 

作者:

Tao Wang,ab Fei Hu,a Emmanuel Ikhile,c Fan Liao,a Yanqing Li*a and Mingwang Shao*a

 

 

单位:

aInstitute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-based Functional Materials and Devices & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215123, P. R. China.

bSchool of Chemistry and Chemical Engineering, Provincial Key Laboratory of Functional Coordination Compounds and Nanomaterials, Anqing Normal University, Anqing, Anhui 246001, P.R. China.

cDepartment of Chemical Engineering, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1.

 

 

摘要:

A two-step galvanic displacement reaction was employed to synthesize Ag-Au nanoparticles grafted on Ge wafer due to the different equilibrium potentials: the Ge wafer was employed to reduce silver ions and grow Ag nanoparticles first; and then it reduced gold ions and grew Au nanoparticles among the gaps of Ag nanoparticles. When they were employed as SERS substrates to detect 200 random spots, to the best

of our knowledge, the lowest relative standard deviation (RSD) of less than 7% was obtained by using Rhodamine 6G (1×10-9M) as probe molecules in the aqueous detection. Crystal violet solution (1×10-8M) was also detected with an ultra low RSD of less than 8%. The result of the electric field distribution by the finite difference time domain  simulation further explained the distinguished sensitivity and uniformity of these substrates. The high uniformity and reproducibility of this SERS substrate may benefit SERS quantitative detection in biology field in the future.

 

 

影响因子:

6.629

 

 

分区情况:

1

 

 

链接:

http://pubs.rsc.org/en/content/articlelanding/2014/tc/c4tc02310b


 

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