不同波长脉冲激光液相制备Ag纳米颗粒在Raman光谱学中的应用

利用Nd:YAG(1064nm)和准分子(KrF,248nm)两种不同波长的脉冲激光器对处于去离子水中的Ag片进行激光烧蚀,得到了不同尺寸的Ag纳米颗粒,同时,这些Ag纳米颗粒与去离子水形成了Ag纳米胶体体系。由于制备这种Ag纳米胶体的是一种物理过程,所以具有较高的纯净性。通过透射电子显微镜(TEM)对两种不同激光器制备的Ag纳米胶体的观测发现,虽然这两种Ag纳米颗粒大小尺寸不同,但都具有较好的分散性和均匀性。同时,在Raman光谱学应用方面,由于这两种Ag纳米胶体中无任何氧化剂或还原剂等外来杂质的干扰,具有非常好的纯净性,可以作为非常好的表面增强拉曼散射的增强基底,并对这两种Ag纳米颗粒与探针对羟基苯甲酸(PHBA)的吸附行为做了简要的分析。

The Application in the Raman Spectroscopy of Ag Nanoparticles Produced by Two Different Wavelength Pulse Laser in Liquid

Different size-scale Ag nanoparticles were produced by Nd:YAG pulse laser with 1064nm wavelength and Excimer(KrF) pulse laser with 248nm wavelength in redistilled deionized water,and two kinds of Ag colloids were obtained.The production of Ag nanoparticles is physical process,so the two kinds of Ag colloids are very pure.Through the detection of transmission electron micrograph(TEM),the two kinds of Ag nanoparticles have homogeneous size distribution with good dispersibility.Without any extraneous components and residual oxidation products in the Ag colloids,we obtained much higher quality SERS spectra of PHBA(phydroxybenzoic acid) molecules on the filter paper coated with Ag nanoparticles, and the adsorption behavior were briefly analysed.