GaAs基底上金纳米粒子的二维组装及其表面增强喇曼散射活性

利用巯基苯胺作耦联分子,成功地将Au纳米粒子组装到GaAs(100)表面上,并且用TM-AFM观察了纳米粒子在表面上的分布情况.Raman研究表明,该基底显示出表面增强喇曼散射活性.

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

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\%(H\-2SO\-4)\}\%V\%(H\-2O\-2)\%V\%(H\-2O)=311, \%V\%(NH\-4OH)\%V\%(H\-2O\-2)\%V\%(H\-2O)=117, HCl and de\|ionized water. Then the wafers were dried with argon and immediately immersed in 1 mmol/L ethanol 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(70 nm) were handled by immersing thus prepared GaAs(100) wafers with PATP SAMs in a colloidal gold suspension for 6 h. The gold nanoparticles were scattered over such a surface. Thus the prepared samples showed a s