Journal
DIAMOND AND RELATED MATERIALS
Volume 105, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.diamond.2020.107790
Keywords
Graphene quantum dots; Hydroxyl functional group; Ammonia gas sensor; Pyrene; SCC-DFTB
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Funding
- grant (TRF-KURDI Research Career Development Grant) from Thailand Research Fund
- Kasetsart University Research and Development Institute [RSA6180062]
- Strengthening and Developing New Researcher Plan
- Faculty of Science, Kasetsart University
- Research and Innovation of Graduate Study Strategy of the National Research Council of Thailand (NRCT)
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In this work, an alternative room-temperature gas sensor was fabricated by drop-casting hydroxyl-functionalized graphene quantum dots (OH-GQDs) onto an interdigitated nickel electrode. The OH-GQDs were prepared based on a bottom-up approach using the hydrothermal treatment of pyrene. Physicochemical characterizations based on the FE-TEM, UV-vis, Raman and XPS confirmed the successful formation of OH-GQDs with high homogeneity and purity. The gas-sensing mechanism of OH-GQDs gas sensor was systematically investigated via gas-sensing experiments and self-consistent charge density functional tight-binding (SCC-DFTB) calculations. The results showed that the room-temperature OH-GQDs gas sensor owns high sensitivity and selectivity as well as fast response to ammonia (NH3) with linear relationship at the concentration ranging from 10 to 500 ppm. The SCC-DFTB calculations indicated that the OH functional group was a major contributing factor to the NH3 sensitivity and selectivity. This study revealed that the modification of GQDs via edge functionalization is a promising approach to attain high performance gas sensors with high selectivity to a desired target gas.
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