Facile preparation of SERS-active nanostructured Au spheres by simple reduction of AuCl4- ions with EDOT.
Uniform submicron-scale Au spheres with an average dimension of 574 nm were facilely prepared from the redox reaction between HAuCl4 and 3,4-ethylenedioxythiophene (EDOT) in aqueous solution under ambient conditions. HAuCl4 precursor readily polymerized to poly(3,4-ethylenedioxythiophene) (PEDOT) and metallic Au spheres simultaneously formed within a short period of time. The Au spheres are consisted of two slightly different types of spherical particles based on their surface textures. Major raspberry-like Au spheres are formed through the assembly of very tiny Au nanoparticles, while minor rosette-like Au spheres are formed through the dense packing of Au nanoplates. Both Au spheres are pure metallic face-centered cubic Au based on X-ray photoelectron spectroscopy and powder X-ray diffraction. The resultant Au spheres are adequate for application to surface-enhanced Raman scattering (SERS) due to their rough surfaces and nanogaps on the surfaces. Both methylene blue and crystal violet molecules were detectable at concentrations as low as 10(-7) M.
Department of Chemistry and Protein Research Center for Bio-Industry, Hankuk University of Foreign Studies, Yongin 449-791, Republic of Korea.
Jin-Yeon
JY
Hong
Department of Chemistry and Protein Research Center for Bio-Industry, Hankuk University of Foreign Studies, Yongin 449-791, Republic of Korea. Electronic address: shuh@hufs.ac.kr.
Seong
S
Huh
D019086:Bridged Bicyclo Compounds, Heterocyclic / Q000737:chemistry*; D002712:Chlorides / Q000737:chemistry*; D005840:Gentian Violet / Q000032:analysis / Q000737:chemistry*; D006046:Gold / Q000737:chemistry*; D017612:Gold Compounds / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D008751:Methylene Blue / Q000032:analysis / Q000737:chemistry*; D046529:Microscopy, Electron, Transmission; D008863:Microspheres; D015394:Molecular Structure; D010084:Oxidation-Reduction; D056951:Photoelectron Spectroscopy; D011108:Polymers / Q000737:chemistry*; D013059:Spectrum Analysis, Raman; D014961:X-Ray Diffraction
D019086:Bridged Bicyclo Compounds, Heterocyclic; D002712:Chlorides; D017612:Gold Compounds; D011108:Polymers; C121383:poly(3,4-ethylene dioxythiophene); D006046:Gold; C024568:gold tetrachloride, acid; D005840:Gentian Violet; D008751:Methylene Blue
3,4-Ethylenedioxythiophene; Gold; Nanostructure; Poly(3,4-ethylenedioxythiophene); Surface-enhanced Raman scattering