A tunable volatile organic compound sensor by using PtO:X/GQDs/TiO2 nanocomposite thin films at room temperature under visible-light activation

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Abstract

In this work, a PtOx/GQDs/TiO2 nanoporous thin film with high sensitivity and excellent selectivity at room temperature is fabricated in situ on a sensor device by using an oxygen-plasma treatment. PtOx/GQDs/TiO2 nanocomposite thin films exhibit distinctly different sensor responses toward oxygen-functionalized VOCs under visible-light activation. In particular, the PtOx/GQDs/TiO2 nanocomposite thin films depict a reversible change in their sensing behaviour from p-type to n-type for oxygen-functionalized VOCs as a function of the oxygen-plasma treatment, while these gas sensors present p-type sensing performance for aromatic VOCs throughout. Furthermore, the gas sensors in this work exhibit high sensitivity to isopropanol gas with a response value of up to 4.4 to 1 ppm and a short response time of 9 seconds at room temperature. The reported synthesis procedure to fabricate a tunable and sensitive VOC sensor may be extended to a potential real-world application in breath diagnosis.

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Shao, S., Chen, Y., Huang, S., Jiang, F., Wang, Y., & Koehn, R. (2017). A tunable volatile organic compound sensor by using PtO:X/GQDs/TiO2 nanocomposite thin films at room temperature under visible-light activation. RSC Advances, 7(63), 39859–39868. https://doi.org/10.1039/c7ra07478f

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