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Issue 63, 2017
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A tunable volatile organic compound sensor by using PtOx/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.

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

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Publication details

The article was received on 07 Jul 2017, accepted on 09 Aug 2017 and first published on 16 Aug 2017


Article type: Paper
DOI: 10.1039/C7RA07478F
RSC Adv., 2017,7, 39859-39868
  • Open access: Creative Commons BY license
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    A tunable volatile organic compound sensor by using PtOx/GQDs/TiO2 nanocomposite thin films at room temperature under visible-light activation

    S. Shao, Y. Chen, S. Huang, F. Jiang, Y. Wang and R. Koehn, RSC Adv., 2017, 7, 39859
    DOI: 10.1039/C7RA07478F

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