液相纳米硒微粒的性质及其共振瑞利散射光谱研究

常温常压下，在0.24 mol·L-1的盐酸介质中，二氧化硒与过量的抗坏血酸(Vc)作用，生成单质硒Se(0)，获得含有纳米硒微粒的均匀溶液;采用透射电镜和激光散射技术，测出Se(0)以26～243 nm的球形聚集状态存在，并在470 nm处有最强的共振瑞利散射(RRS)，在入射波长2倍和1/2处分别有二级散射(SOS)和倍频散射(MFS)，其共振瑞利散射强度ΔI₄₇₀与Se(Ⅳ)的浓度在2.82×10-9～5.64×10-6 g·mL-1范围内呈线性关系，相关系数为0.997。

Study on Properties and Resonance Rayleigh Scattering Spectra of Nanometer Selenium(0) Particles in Liquid Phase

In the HCl solution, selenium (IV) and excessive ascorbic acid (Vc) formed selenium(0), which homogeneously and steadily existed in liquid phase system. The Se(0) particles were aggregating spheres and their sizes were 26-243 nm from transmission electron microscope (TEM) and laser light scattering image. The nanometer Se(0) solution produced strongest resonance rayleigh scattering (RRS) at 470 nm. The intensity of RRS at 470 nm was linear with the concentration of Se(IV) in the range of 2.82 x 10(-9) -5.64 x 10(-6) g x mL(-1) (r = 0.997). Moreover, obvious Second-order scattering (SOS) and multiple frequence scattering (MFS) appeared at the same time.