We report an electrophoretic deposition method for the fabrication of gold nanoparticle (GNP) thin films as sensitive surface-enhanced Raman scattering (SERS) substrates. In this method, GNP sol, synthesized by a seed-mediated growth approach, and indium tin oxide (ITO) glass substrates were utilized as an electrophoretic solution and electrodes, respectively. From the scanning electron microscopy analysis, we found that the density of GNPs deposited on ITO glass substrates increases with prolonged electrophoresis time. The films possess high mechanical adhesion strength and exhibit strong localized surface plasmon resonance (LSPR) effect by showing high SERS sensitivity to detect 1 x 10(-7) M rhodamine 6 G in methanol solution. Finally, the relationship between Raman signal amplification capability and GNP deposition density has been further investigated. The results of our experiment indicate that the high-density GNP film shows relatively higher signal amplification capability due to the strong LSPR effect in narrow gap regions between the neighboring particles on the film.
1.Southeast Univ, Sch Elect Sci & Engn, Nanjing 210096, Peoples R China 2.Minist Educ, Key Lab Microinertial Instrument & Adv Nav Techno, Nanjing 210096, Peoples R China 3.Southeast Univ, Suzhou Res Inst, Suzhou Key Lab Met Nanooptoelect Technol, Suzhou 215123, Peoples R China 4.Southeast Univ, Sch Mat Sci & Engn, Nanjing 211189, Peoples R China 5.Chinese Acad Sci, Inst Opt & Elect, Chengdu 610209, Shuangliu, Peoples R China
Zhu, Sheng-Qing,Zhang, Tong,Guo, Xin-Li,et al. Gold nanoparticle thin films fabricated by electrophoretic deposition method for highly sensitive SERS application[J]. NANOSCALE RESEARCH LETTERS,2012,7.