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https://dspace.iiti.ac.in/handle/123456789/7679
Title: | High Efficiency Epitaxial-Graphene/Silicon-Carbide Photocatalyst with Tunable Photocatalytic Activity and Bandgap Narrowing |
Authors: | Mathur, Aakash Dutta, Surjendu Bikash Pal, Dipayan Singh, Ajaib K. Chattopadhyay, Sudeshna |
Issue Date: | 2016 |
Publisher: | Wiley-VCH Verlag |
Citation: | Mathur, A., Dutta, S. B., Pal, D., Singhal, J., Singh, A., & Chattopadhyay, S. (2016). High efficiency epitaxial-Graphene/Silicon-carbide photocatalyst with tunable photocatalytic activity and bandgap narrowing. Advanced Materials Interfaces, 3(19) doi:10.1002/admi.201600413 |
Abstract: | A novel way of tuning photocatalytic activity and bandgap narrowing in epitaxial graphene/silicon carbide (EG/SiC) yields high efficiency photocatalyst. Graphitization of SiC by high-temperature thermal decomposition method with different annealing time forms sets of EG/SiC composites having different quality of graphene layers, confirmed by Raman spectroscopy. The Raman intensity ratio of the 2D band to the G band, I2D/IG, represents a measure of quality and quantity of graphene and heterojunction interface layer between EG and SiC. Experimental results reveal that I2D/IG plays a crucial role in tuning the bandgap and enhancement of photocatalytic activity of EG/SiC composites in a systematic manner irrespective of crystal structure or size of the SiC particles. In addition, EG/SiC shows intense broad background absorption in the visible range with increasing I2D/IG. The suitable selection of I2D/IG for EG/SiC gives excellent photocatalytic activity under UV light, up to ≈1000% enhancement and remarkable bandgap narrowing, upto 2 eV and even lesser, which is more than ≈30% reduction, relative to the as received SiC. The efficient control of the electronic structure in such EG/SiC heterojunctions obtained by tailoring the structural parameter I2D/IG opens up promising pathway for bandgap engineering and enhancement of photocatalytic activity. © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim |
URI: | https://doi.org/10.1002/admi.201600413 https://dspace.iiti.ac.in/handle/123456789/7679 |
ISSN: | 2196-7350 |
Type of Material: | Journal Article |
Appears in Collections: | Department of Metallurgical Engineering and Materials Sciences |
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