UV-Activated Au Modified TiO2/In2O3 Hollow Nanospheres for Formaldehyde Detection at Room Temperature

被引：6
作者：
Zhang, Su [1 ]
Huang, Baoyu [1 ]
Jiang, Zenghao [1 ]
Qian, Junfan [1 ]
Cao, Jiawei [1 ]
Feng, Qiuxia [2 ]
Zhang, Jianwei [3 ]
Li, Xiaogan [1 ,4 ]
机构：
[1] Dalian Univ Technol, Sch Microelect, Dalian 116024, Peoples R China
[2] Qingdao Univ Technol, Sch Informat & Control Engn, Qingdao 266520, Peoples R China
[3] Dalian Univ Technol, Sch Artificial Intelligence, Dalian 116024, Peoples R China
[4] Dalian Univ Technol, Key Lab Integrated Circuit & Biomed Elect Syst, Dalian 116023, Peoples R China
来源：
MATERIALS | 2023年 / 16卷 / 11期
基金：
国家重点研发计划; 中国国家自然科学基金;
关键词：
Au modified TiO2/In2O3 hollow nanospheres; room temperature formaldehyde sensors; UV activation; in situ DRIFTS; SENSING FORMALDEHYDE; LIGHT ACTIVATION; VISIBLE-LIGHT; TIO2; NANOPARTICLES; PERFORMANCE; SENSOR; CORE; FABRICATION; HUMIDITY;
D O I：
10.3390/ma16114010
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Au modified TiO2/In2O3 hollow nanospheres were synthesized by the hydrolysis method using the carbon nanospheres as a sacrificial template. Compared to pure In2O3, pure TiO2, and TiO2/In2O3 based sensors, the Au/TiO2/In2O3 nanosphere-based chemiresistive-type sensor exhibited excellent sensing performances to formaldehyde at room temperature under ultraviolet light (UV-LED) activation. The response of the Au/TiO2/In2O3 nanocomposite-based sensor to 1 ppm formaldehyde was about 5.6, which is higher than that of In2O3 (1.6), TiO2 (2.1), and TiO2/In2O3 (3.8). The response time and recovery time of the Au/TiO2/In2O3 nanocomposite sensor were 18 s and 42 s, respectively. The detectable formaldehyde concentration could go down as low as 60 ppb. In situ diffuse reflectance Fourier transform infrared spectroscopy (DRIFTS) was used to analyze the chemical reactions on the surface of the sensor activated by UV light. The improvement in the sensing properties of the Au/TiO2/In2O3 nanocomposites could be attributed to the nanoheterojunctions and electronic/chemical sensitization of the Au nanoparticles.
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页数：18
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