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在溶液中以正己硫醇作稳定剂,利用HAuCl4与HF处理后的硅纳米线(SiNWs)的氧化还原反应,在SiNWs表面负载金纳米粒子(AuNPs).通过调整HAuCl4的浓度,得到了AuNPs粒径从3.2到7.0nm的AuNPs/SiNWs复合结构,并对这种复合结构进行了紫外-可见吸收光谱和荧光光谱研究.紫外-可见吸收光谱研究表明,负载不同粒径的AuNPs的SiNWs在530～580nm间有明显的由AuNPs表面等离子体共振引起的吸收,且随着AuNPs粒径的增加,该吸收峰发生红移.负载前后的荧光光谱表明,在红光和绿光区负载AuNPs的SiNWs的荧光峰与HF处理后SiNWs的荧光峰峰形相当,峰位变化不大;但在蓝光区,不同于HF处理前后SiNWs的发射峰(464nm左右),负载了AuNPs的SiNWs在423nm的位置处出现了强荧光峰,这个峰是AuNPs费米能级的电子与sp或d带的空穴辐射复合产生的.
AuNPs were loaded on the surface of SiNWs by the reaction of HAuCl4 and HF-treated silicon nanowires (SiNWs) with n-hexanethiol as a stabilizer in the solution. By adjusting the concentration of HAuCl4, AuNPs particles AuNPs / SiNWs composites with diameters from 3.2 to 7.0 nm were synthesized and characterized by UV-Vis absorption spectra and UV-Vis spectra. The results of UV-Vis absorption spectra show that the AuNPs / 580nm between the absorption caused by the AuNPs surface plasmon resonance, and with the increase of AuNPs particle size, the absorption peak redshift.The fluorescence spectra before and after loading show that the red and green light-loaded AuNPs SiNWs However, in the blue region, different from the emission peak of SiNWs (about 464 nm) before and after HF treatment, the SiNWs loaded with AuNPs appeared at 423 nm Strong fluorescence peak, the peak is the AuNPs Fermi level of electrons and sp or d hole radiation generated by the composite.