title: SERS activity studies of Ag/Au bimetallic films prepared by galvanic replacement.
abstract: Ag films on Si substrates were fabricated by immersion plating, which served as sacrificial materials for preparation of Ag/Au bimetallic films by galvanic replacement method. SEM images displayed that the sacrificial Ag films presenting island morphology experienced interesting structural evolution process during galvanic replacement reaction, and nano-scaled holes were formed in the resultant bimetallic films. SERS measurements using crystal violet as an analyte showed that SERS intensities of bimetallic films were enhanced significantly compared with that of pure Ag films and related mechanisms were discussed. Immersion plating experiment carried out on Ag films on PEN substrates fabricated by photoinduced reduction method further confirmed that galvanic replacement is an easy method to fabricate Ag/Au bimetallic and a potential approach to improve the SERS performance of Ag films.
authors.affiliation: School of Science, Nantong University, Jiangsu 226007, PR China.
authors.forename: Chaonan
authors.initials: C
authors.lastname: Wang
authors.forename: Jinghuai
authors.initials: J
authors.lastname: Fang
authors.forename: Yonglong
authors.initials: Y
authors.lastname: Jin
mesh_terms: D055664:Electrochemical Techniques / Q000379:methods*; D005840:Gentian Violet / Q000737:chemistry; D006046:Gold / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry / Q000648:ultrastructure; D020959:Polyethylene / Q000737:chemistry; D012825:Silicon / Q000737:chemistry; D012834:Silver / Q000737:chemistry*; D012996:Solutions; D013052:Spectrometry, X-Ray Emission; D013059:Spectrum Analysis, Raman
chemical_list: D012996:Solutions; D012834:Silver; D006046:Gold; D020959:Polyethylene; D005840:Gentian Violet; D012825:Silicon