二氧化锰纳米微粒的制备及其共振瑞利散射光谱研究

Synthesis and Resonance Rayleigh Scattering Spectra Properties of Nanometer (MnO_2)_n Colloid Particle

基于KMnO4 与NH3 ·H2 O反应 ,用微波高压液相合成技术制备了粒径为 12 5nm的二氧化锰纳米微粒。二氧化锰纳米微粒的稳定性实验发现 ,微量NaNO3 和TritonX 10 0对二氧化锰纳米微粒的稳定起一定作用 .二氧化锰纳米微粒在 34 2nm处有特征吸收峰 .它的共振瑞利散射峰分别位于 410nm ,470nm ,5 30nm ,共振瑞利散射强度I4 70 与二氧化锰浓度在 2× 10 -7～ 4× 10 -5mol/L范围内呈线性关系 ,相关系数 0 9987.还研究了二氧化锰米微粒的非线性散射现象 .

Nanometer manganese dioxide colloid particle was prepared by microwave high press liquid synthesis, which is based on the oxidation reduction reaction between KMnO\-4 and NH\-3·H\-2O. The mean particle sizes are about 12.5 nm from TEM image. Triton X 100 and micro amount of NaNO\-3 have beneficial effect on the stability of the particles. Ultraviolet absorption spectra and resonance Rayleigh scattering spectra of nanometer (MnO\-2)\- n were discussed. We found the special absorption peak of (MnO\-2)\- n was located at 342 nm. There were three resonance Rayliegh scattering (RRS) peaks of (MnO\-2)\- n , at 410 nm, 470 nm, 510 nm respectively. The intensity of RRS at 470 nm was directly proportional to the concentration of (MnO\-2)\- n in range of 2×10 -7 -4×10 -5 mol/L. The nonlinear scattering of (MnO\-2)\- n colloid particle was also discussed.