Tm^3＋掺杂纳米In2O3的制备及其气敏性能研究

Preparation of Tm^(3+) Doped In_2O_3 Nanopowders and Its Gas Sensitive Property

为了测试Tm3+掺杂纳米In2O3的气敏性能,以InCl3.4H2O、Tm2O3和柠檬酸为原料,通过溶胶凝胶法制备出Tm3+掺杂的In2O3纳米粉体,并通过XRD、TEM对产物进行了结构、形貌的测量和表征。结果表明:前驱体经600℃高温热处理后得到粒径约为33 nm的纳米粉体。将产物制作成气敏元件,采用静态配气法测试了材料的气敏性能,发现元件在工作温度为250℃时对50×10-6的NO2的灵敏度达到128,响应时间达4 s,而且对其他气体有较好的抗干扰性,有望开发成为对NO2检测的敏感材料。

In order to test the gas sensitive property of Tm^3 ＋ doped In2O3 nanopowders, using InCl3 · 4H2 O, Tm2O3 and citric acid as raw material, Tm^3＋ doped In2O3 nanopowders were synthesized by sol-gel method. The structure, morphology were characterized and measured by XRD and TEM. The results show Tm^3＋ doped In2O3 nanopowders about 33 nm can be obtained at 600 ℃. The gas sensitivity of side-heated gas sensors was measured with static state distribution. The sensors based on the nanopowders have higher sensitivity （ 128 ） to 50 × 10^-6 NO2 at 250 ℃, the response time is 4 s, and the selectivity is good. It can be expected to be a potential gas sensitive material to NO2.