Synthesis of mesoporous K2O-In2O3 nanowires and NOx gas sensitive performance study in room temperature

被引:11
作者
Rehman, Afrasiab Ur [1 ]
Zhang, Jiawei [2 ]
Zhou, Jiao [1 ]
Kan, Kan [1 ]
Li, Li [1 ]
Shi, Keying [1 ]
机构
[1] Heilongjiang Univ, Sch Chem & Mat Sci, Minist Educ, Key Lab Photon & Elect,Key Lab Funct Inorgan Mat, Harbin 150080, Peoples R China
[2] Harbin Normal Univ, Modern Expt Ctr, Harbin 150025, Peoples R China
基金
中国国家自然科学基金;
关键词
K2O-In2O3; nanowires; Alkaline center; NOx; Gas sensor; SENSING PROPERTIES; CHEMICAL SENSORS; CO OXIDATION; NANOTUBES; ETHANOL; NANOSTRUCTURES; NANOCOMPOSITES; ALPHA-FE2O3;
D O I
10.1016/j.micromeso.2016.11.006
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
In this work, highly crystalline mesoporous In2O3 nanowires (NWs) doped with K2O, ZnCl2 or CaCl2 were synthesized by template-calcined method using SBA-16 as template. The mesoporous K2O-In(2)O(3)NWs (INW-K2), which was synthesized by mixing 0.2 mol In(NO3)(3) solution with 0.02 g KNO3 so that In(NO3)(3) and KNO3 mass ratio was 30:1, has high density of chemisorbed oxygen. Its diameter is about 4-8 nm and pore size is 3-5 nm. For INW-K-2, K2O doped on its surfaces serves as alkaline center and benefits the adsorption and diffusion of acidic NOx. Meanwhile, the INW-K2 provides large number of active centers for gaseous reactions on the surface of the nanowires. Therefore, the gas sensing property of INW-K2 is significantly improved, the response of NOx to 97 pPin is about 151.78 and response time is only 12 s, the detection limitation decreased to 48.5 ppb at room temperature (RT). The highly crystalline mesoporous K2O-In2O3 nanowires might offer a new opportunity for synthesizing multifunctional sensing materials in future. (C) 2016 Elsevier Inc. All rights reserved.
引用
收藏
页码:50 / 56
页数:7
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