| Autor: |
Ghadei SK; CSIR-Institute of Minerals and Materials Technology, Bhubaneswar 751013, India.; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India., Ficek M; Department of Metrology and Optoelectronics, Faculty of Electronics, Telecommunications and Informatics, Gdansk University of Technology, 80-233 Gdansk, Poland., Sethy SK; CSIR-Institute of Minerals and Materials Technology, Bhubaneswar 751013, India.; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India., Ryl J; Division of Electrochemistry and Surface Physical Chemistry, Institute of Nanotechnology and Materials Engineering, Gdańsk University of Technology, Narutowicza 11/12, 80-233 Gdańsk, Poland., Gupta M; UGC-DAE Consortium for Scientific Research, Khandwa Road, Indore, Madhya Pradesh 452001, India., Sakthivel R; CSIR-Institute of Minerals and Materials Technology, Bhubaneswar 751013, India.; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India., Sankaran KJ; CSIR-Institute of Minerals and Materials Technology, Bhubaneswar 751013, India.; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India., Bogdanowicz R; Department of Metrology and Optoelectronics, Faculty of Electronics, Telecommunications and Informatics, Gdansk University of Technology, 80-233 Gdansk, Poland. |
| Abstrakt: |
Self-formation of boron-doped diamond (BDD)-multilayer graphene (MLG) core-shell nanowalls (BDGNWs) via microwave plasma-enhanced chemical vapor deposition is systematically investigated. Here, the incorporation of nitrogen brings out the origin of MLG shells encapsulating the diamond core, resulting in unique sp 3 /sp 2 hybridized frameworks. The evolution mechanism of the nanowall-like morphology with the BDD-MLG core-shell composition is elucidated through a variety of spectroscopic studies. The photocatalytic performance of these core-shell nanowalls is examined by the deterioration of methylene blue (MB) and rhodamine B (RhB) dyes beneath low-power ultraviolet (UV) light irradiation. Starting with 5 ppm dye solutions and employing BDGNWs as the photocatalyst, remarkable degradation efficiencies of 95% for MB within 100 min and 91% for RhB within 220 min are achieved. The effect of varying dye concentrations was also examined. The enhanced photocatalytic activity is driven by carrier photogeneration and mediated by the Schottky junction formed between BDD and MLG, promoting efficient photoinduced charge separation. The stability of the BDGNW photocatalyst is examined, and after five test runs, the photocatalytic behavior for MB and RhB degradation decreases to 87 and 85%, respectively, from initial values of 96 and 91%, demonstrating excellent photostability. These findings underscore the significance of diamond-graphene nanoarchitectures as promising green carbonaceous photocatalysts. |
