利用Cr_2O_3-LaCoO_3-Pt纳米材料催化发光测定大气中的氨分子

Study of Cataluminescence Characteristics of NH_3 on the Surface of Nanosized Materials

研究了氨分子在Cr2 O3 纳米粒子 (粒径 5 0～ 80nm)表面的化学发光行为 ,发现这种纳米材料对氨分子具有较强的选择性 .进一步的研究表明 ,在掺杂了LaCoO3 纳米粒子 (粒径 2 0nm)和Pt纳米粒子 (粒径≤ 10nm)后 ,化学发光强度增强了近 2 5倍 .在最佳反应条件下 ,化学发光强度与氨分子的浓度在 15 .0× 10 -6～ 75 0× 10 -6内呈良好的线性关系 (r=0 995 ) ,检出限为 4 0× 10 -6.

Chemiluminescence (CL) behavior of NH3 upon catalytic oxidation on Cr2O3 + LaCoO3 + Pt nanoparticles was studied. The results showed that the nanosized materials could be used for selective determination of NH3 molecules in gas. Under the optimized conditions, the linear range of CL intensity versus NH3 concentration is 15.0 x 10(-6) to 750 x 10(-6) (r = 0.995), with a detection limit of 4.0 x 10(-6).