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Photocatalytic Water Disinfection of CVD Grown WS 2 Monolayer Decorated with Ag Nanoparticles
Author(s) -
Kumar Pawan,
Kataria Shivangi,
Roy Shounak,
Jaiswal Amit,
Balakrishnan Viswanath
Publication year - 2018
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201800997
Subject(s) - monolayer , photocatalysis , materials science , nanotechnology , chemical vapor deposition , nanoparticle , substrate (aquarium) , fluorescence , nanostructure , visible spectrum , chemical engineering , band gap , chemistry , optoelectronics , catalysis , optics , organic chemistry , oceanography , physics , engineering , geology
Two dimensional nanostructures of transition metal dichalcogenides like WS 2 have been drawing much attention for biological applications owing to their intrinsic chemical and optical properties with tunable band gap. We have evaluated photocatalytic properties of chemical vapor deposited (CVD) grown WS 2 monolayer with a direct band gap of 1.94 eV to disinfect water from Gram‐negative E.coli bacteria under fluorescence light by colony counting method. WS 2 monolayer decorated with 10‐15 nm silver nanoparticles is found to enhance the antibacterial activity in comparison with individual components significantly. We have achieved up to 96% of bacterial growth inhibition by increasing the areal coverage of WS 2 (upto 42%) coated with Ag nanoparticles in 3 hours, under fluorescent light. Moreover, direct correlation between the water disinfection ability and geometrical surface areal coverage of the monolayer WS 2 on SiO 2 /Si substrate has been established to emphasize on the need of uniform CVD growth of WS 2 monolayers over large scale for practical application like rapid and efficient cleaning technology.