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Scalable Hybrid Antibacterial Surfaces: TiO2Nanoparticles with Black Silicon

Singh, J and Hegde, PB and Avasthi, S and Sen, P (2022) Scalable Hybrid Antibacterial Surfaces: TiO2Nanoparticles with Black Silicon. In: ACS Omega, 7 (9). pp. 7816-7824.

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Official URL: https://doi.org/10.1021/acsomega.1c06706


With the increase of drug resistance, there is a need for surface coatings that inhibit microbes without antibiotics. Nanostructured photocatalysts, like TiO2-coated nanotubes, are promising alternatives to antibiotics. Nanostructures rupture the cell wall by impaling the bacteria. Photocatalysts generate reactive oxygen species (ROS) in the presence of light, which oxidize organic matter. The combined effect of photocatalysts and nanostructures is better than the addition of individual components, as nanostructures also enhance the ROS production by trapping light. The synergetic effect is remarkably effective in reducing the growth of bacterial colonies, but scalability still remains a challenge. Conventional techniques like atomic layer deposition (ALD) are excellent for proof of concept but are not scalable to hundreds of square meters, as needed for practical applications. This report demonstrates two scalable and cost-effective techniques for synthesizing photocatalytic nanostructures: spray- and spin-coating TiO2nanoparticles. Unlike ALD, spray- and spin-coated TiO2nanoparticles do not reduce the roughness of a structured surface, which improves antibacterial performance by 23. Integration of nanostructures with spray-coated TiO2is potentially a low-cost and scalable technology for large-area antibacterial surfaces.

Item Type: Journal Article
Publication: ACS Omega
Publisher: American Chemical Society
Additional Information: The copyright for this article belongs to the Authors.
Department/Centre: Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited: 16 Jun 2022 11:25
Last Modified: 16 Jun 2022 11:25
URI: https://eprints.iisc.ac.in/id/eprint/73764

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