Zhang Su, Huang Baoyu, Jiang Zenghao, Qian Junfan, Cao Jiawei, Feng Qiuxia, Zhang Jianwei, Li Xiaogan
School of Microelectronics, Dalian University of Technology, Dalian 116024, China.
School of Information and Control Engineering, Qingdao University of Technology, Qingdao 266520, China.
Materials (Basel). 2023 May 26;16(11):4010. doi: 10.3390/ma16114010.
Au modified TiO/InO hollow nanospheres were synthesized by the hydrolysis method using the carbon nanospheres as a sacrificial template. Compared to pure InO, pure TiO, and TiO/InO based sensors, the Au/TiO/InO 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/TiO/InO nanocomposite-based sensor to 1 ppm formaldehyde was about 5.6, which is higher than that of InO (1.6), TiO (2.1), and TiO/InO (3.8). The response time and recovery time of the Au/TiO/InO 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/TiO/InO nanocomposites could be attributed to the nanoheterojunctions and electronic/chemical sensitization of the Au nanoparticles.
以碳纳米球为牺牲模板，采用水解法合成了金修饰的二氧化钛/氧化铟空心纳米球。与纯氧化铟、纯二氧化钛以及基于二氧化钛/氧化铟的传感器相比，基于金/二氧化钛/氧化铟纳米球的化学电阻型传感器在室温下紫外光（紫外发光二极管）激活条件下对甲醛表现出优异的传感性能。基于金/二氧化钛/氧化铟纳米复合材料的传感器对1 ppm甲醛的响应约为5.6，高于氧化铟（1.6）、二氧化钛（2.1）和二氧化钛/氧化铟（3.8）的响应。金/二氧化钛/氧化铟纳米复合传感器的响应时间和恢复时间分别为18秒和42秒。可检测到的甲醛浓度可低至60 ppb。采用原位漫反射傅里叶变换红外光谱（DRIFTS）分析紫外光激活下传感器表面的化学反应。金/二氧化钛/氧化铟纳米复合材料传感性能的提高可归因于纳米异质结以及金纳米颗粒的电子/化学敏化作用。
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