Ou Yucheng, Zhu Gangqiang, Liu Peng, Jia Yanmin, Zhu Lujun, Nie Junli, Zhang Shaolin, Zhang Weibin, Gao Jianzhi, Lu Hongbing, Huang Yu, Shi Xianjin, Hojamberdiev Mirabbos
School of Physics and Information Technology, Shaanxi Normal University, Xi'an 710062, P. R. China.
School of Science, Xian University of Posts and Telecommunications, Xi'an 710121, P. R. China.
ACS Sens. 2022 Apr 22;7(4):1201-1212. doi: 10.1021/acssensors.2c00334. Epub 2022 Apr 1.
To avoid carcinogenicity, formaldehyde gas, currently being only detected at higher operating temperatures, should be selectively detected in time with ppb concentration sensitivity in a room-temperature indoor environment. This is achieved in this work through introducing oxygen vacancies and Pt clusters on the surface of InO to reduce the optimal operating temperature from 120 to 40 °C. Previous studies have shown that only water participates in the competitive adsorption on the sensor surface. Here, we experimentally confirm that the adsorbed water on the fabricated sensor surface is consumed via a chemical reaction due to the strong interaction between the oxygen vacancies and Pt clusters. Therefore, the long-term stability of formaldehyde gas detection is improved. The results of theoretical calculations in this work reveal that the excellent formaldehyde gas detection of Pt/InO originates from the electron enrichment due to the surface oxygen vacancies and the molecular adsorption and activation ability of Pt clusters on the surface. The developed Pt/InO sensor has potential use in the ultraefficient, low-temperature, highly sensitive, and stable detection of indoor formaldehyde at an operating temperature as low as room temperature.
为避免致癌性，目前仅在较高工作温度下才能检测到的甲醛气体，应在室温室内环境中以ppb浓度灵敏度及时进行选择性检测。在这项工作中，通过在InO表面引入氧空位和铂簇，将最佳工作温度从120℃降低到40℃，从而实现了这一点。先前的研究表明，只有水参与传感器表面的竞争吸附。在此，我们通过实验证实，由于氧空位和铂簇之间的强相互作用，制造的传感器表面吸附的水通过化学反应被消耗。因此，甲醛气体检测的长期稳定性得到提高。这项工作的理论计算结果表明，Pt/InO对甲醛气体的优异检测源于表面氧空位导致的电子富集以及表面铂簇的分子吸附和活化能力。所开发的Pt/InO传感器在低至室温的工作温度下对室内甲醛进行超高效、低温、高灵敏度和稳定检测方面具有潜在用途。
