Self-assembled Au Nanoparticles on GaAs and Its Surface Enhanced Raman Scattering(SERS)-activity

Abstract

Abstract: By using p-aminothiophenol(PATP) as the coupling molecular, the Au nanoparticles were successfully self-assembled onto the GaAs(100) surface. Firstly, the mechanically polished semi-insulating GaAs(100) wafers were degreased in trichloroethylene, acetone, methanol, and the surface oxides were chemically polished and removed by rinsing them in V(H₂SO₄)V(H₂O₂)V(H₂O)=3:1:1, V(NH₄OH)V(H₂O₂)V(H₂O)=1:1:7, HCl and de-ionized water. Then the wafers were dried with argon and immediately immersed in1 mmol/Lethanol solution of PATP. After assembling in the solution for 24 h with argon protection, the GaAs(100) wafers with PATP SAMs were ultrasonicated in pure ethanol to remove those physical adsorbed PATP molecules. Assembling of gold nanoparticles(70nm) were handled by immersing thus prepared GaAs(100) wafers with PATP SAMs in a colloidal gold suspension for 6h. The gold nanoparticles were scattered over such a surface. Thus the prepared samples showed a surface enhanced Raman scat tering(SERS)-activity.

Key words: GaAs, Gold nanoparticle, Self-assembled, SER Surface enhanced Raman scattering(SERS)-activity.

CLC Number:

O647.1

TrendMD:

CHEN Hai-Feng, WANG Jian, CAI Sheng-Min, LIU Zhong-Fan . Self-assembled Au Nanoparticles on GaAs and Its Surface Enhanced Raman Scattering(SERS)-activity[J]. Chem. J. Chinese Universities, 1999, 20(4): 620.

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Self-assembled Au Nanoparticles on GaAs and Its Surface Enhanced Raman Scattering(SERS)-activity

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