Au纳米颗粒负载SnO2双层空心立方体的CO气敏性能

doi:10.7503/cjcu20180487

高等学校化学学报 ›› 2018, Vol. 39 ›› Issue (9): 1867.doi: 10.7503/cjcu20180487

Au纳米颗粒负载SnO₂双层空心立方体的CO气敏性能

马俊锋¹, 曾毅²()

1. 吉林大学生命科学学院, 2. 材料科学与工程学院, 汽车材料教育部重点实验室, 长春 130012

收稿日期:2018-07-06 出版日期:2018-09-07 发布日期:2018-09-05
作者简介:
联系人简介: 曾毅, 男, 博士, 教授, 主要从事先进敏感功能材料与传感器和新能源材料等方面的研究. E-mail: zengyi@jlu.edu.cn
基金资助:
吉林省科技发展计划项目(批准号: 20170101168JC, 20180101271JC)资助.

Significant Improvement of CO Sensing Performance Based on Au-sensitized Double-shelled SnO₂ Hollow Nanocubes^†

MA Junfeng¹, ZENG Yi^2,^*()

1. College of Life Sciences, 2. College of Materials Science and Engineering, Key Laboratory of Automobile Materials of Ministry of Educations, Jilin University, Changchun 130012, China

Received:2018-07-06 Online:2018-09-07 Published:2018-09-05
Contact: ZENG Yi E-mail:zengyi@jlu.edu.cn
Supported by:
? Supported by the Science and Technology Development Project of Jilin Province, China(Nos. 20170101168JC, 20180101271JC).

摘要/Abstract

摘要：

基于中空多孔微纳米结构的结构特点以及贵金属Au纳米颗粒的催化活化作用, 制备了Au纳米颗粒负载的SnO₂双层空心立方体, 其CO气敏性能比纯相SnO₂纳米结构显著增强. 本文对纯相和Au负载SnO₂双层空心立方体的结构、形貌和气敏性能进行了研究, 发现均匀负载的Au纳米颗粒未显著破坏SnO₂双层空心立方纳米结构. CO气敏性能研究结果表明, Au负载SnO₂在最佳工作温度(220 ℃)下对24.7 mg/m³(20 ppm) CO气体的灵敏度可达20.9, 明显高于纯相SnO₂的灵敏度. Au负载SnO₂对CO气敏特性的显著增强不仅归因于双层空心立方结构的特殊结构优点, 还可以归因于负载的Au纳米颗粒的催化活化作用.

关键词: 二氧化锡, 金, 多层纳米结构, 催化活化, 气体传感器

Abstract:

Based on the unique structural merits of hollow interior, hierarchical nanoparticle-assembled and permeable double shells, the CO sensing performance of double-shelled SnO₂ nanocubes can be further promoted by the sensitization of the loaded Au nanoparticles. The crystallinity, morphology and structure of pure and Au-loaded SnO₂ hollow nanocubes(HNCs) are detailedly characterized and the results certify that the less-agglomerated configuration of Au-loaded SnO₂ is still reserved. Furthermore, the CO sensing performances of pure and Au-loaded SnO₂ HNCs demonstrate that Au-loaded SnO₂ exhibits a high response value of 20.9 to 24.7 mg/m³(20 ppm) CO at the optimal working temperature of 220 ℃, which is significantly higher than that of pure SnO₂. Besides their structural merits, the significant improvement of CO sensing properties can be attributed to the sensitized promotion of noble Au.

Key words: Tin oxide, Au, Multilayered nanostructures, Catalytic activation, Gas sensor

中图分类号:

O614

TrendMD:

马俊锋, 曾毅. Au纳米颗粒负载SnO₂双层空心立方体的CO气敏性能. 高等学校化学学报, 2018, 39(9): 1867.

MA Junfeng,ZENG Yi. Significant Improvement of CO Sensing Performance Based on Au-sensitized Double-shelled SnO₂ Hollow Nanocubes^†. Chem. J. Chinese Universities, 2018, 39(9): 1867.

图/表 6

Fig.1 XRD patterns of pure SnO2 HNCs(a) and Au-loaded SnO2 HNCs(b)

Fig.2 FESEM images(A—C) and TEM image(D) of pure SnO2 HNCs Insets in (C) and (D) are the typical SAED pattern and HRTEM image, respectively.

Fig.3 Typical FESEM(A), TEM(B, C) and HRTEM(D) images of Au-loaded SnO2 HNCsInsets are the enlarged FESEM(A) and TEM(D) images of Au-loaded SnO2 HNCs.

Fig.4 EDX(A) and nitrogen adsorption/desorption isotherms with pore-size distribution(B) of pure and Au-loaded SnO2 HNCsa. Unloaded SnO2; b. Au-loaded SnO2.

Fig.5 Temperature-dependent response and selectivity curves(A, B), concentration-dependent response(C, D) of pure and Au-loaded SnO2 HNCs, dynamic response transients and the response-recovery time of Au-loaded SnO2 HNCs(E, F)(A) a. Au-loaded SnO2; b. pure SnO2; (C, D) a. Au-loaded(220 ℃); b. unloaded(300 ℃).

Fig.6 Schematic diagram of CO sensing process and mechanism of Au-loaded SnO2 HNCs

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Au纳米颗粒负载SnO₂双层空心立方体的CO气敏性能

Significant Improvement of CO Sensing Performance Based on Au-sensitized Double-shelled SnO₂ Hollow Nanocubes^†

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