化学学报 ›› 2002, Vol. 60 ›› Issue (9): 1668-1671. 上一篇    下一篇

研究论文

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

饶志明;施进军;张新荣   

  1. 清华大学化学系.北京(100084)
  • 出版日期:2002-09-15 发布日期:2002-09-15

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

Rao Zhiming;Shi Jinjun;Zhang Xinrong   

  1. Department of Chemistry, Tsinghua University.Beijing(100084)
  • Online:2002-09-15 Published:2002-09-15

研究了氨分子在Cr_2O_3纳米粒子(粒径50 ~ 80 nm)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 LaCoO_3纳米粒子(粒径20 nm)和Pt纳米粒子(粒径≤10 nm)后,化学发光强度 增强了近25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) ~ 750 * 10~(-6)内呈良好的线性关系(r = 0.995),检出限为4.0 * 10~(- 6)。

关键词: 氧化铬, 氧化镧, 氧化钴, 纳米相材料, 化学发光,

Chemiluminescence (CL) behavior of NH_3 upon catalytic oxidation on Cr_2O_3 + LaCoO_3 + Pt nanoparticles was studied. The results showed that the nanosized materials could be used for selective determination of NH_3 molecules in gas. Under the optimized conditions, the linear range of CL intensity versus NH_3 concentration is 15.0 * 10~(-6) to 750 * 10~(-6) (r = 0.995), with a detection limit of 4.0 * 10~(-6).

Key words: CHROMIUM OXIDE, LANTHANUM OXIDE, COBALT OXIDE, NANOPHASE MATERIALS, CHEMILUMINESSENCE, AMMONIA

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