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Advanced Science and Technology of Nano-Photocatalytic Materials

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Prof. Dr. Tobias Schnabel

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Engineering Department, Hof University of Applied Science, Alfons-Goppel Platz 1, 95028 Hof, Germany
Interests: water treatment; degradation; organic pollutants; photocatalysts; hydroxyl radical; oxidation

Special Issue Information

Dear Colleagues,

This Special Issue, titled “Advanced Science and Technology of Nano-Photocatalytic Materials”, addresses the environmental technologies and energy technology systems used for the purification of air, water, and the production of green energy and hydrogen with nanoscale photocatalytic materials. The areas of nanoscale-mixed oxide catalysts and innovative coating technologies for fixing materials are of particular importance here. The content of manuscripts submitted to this Special Issue should range from material synthesis and photochemical and physical material characterization to application studies using quantitative methods. Manuscripts which focus on bandgap engineering for the increased utilization of sunlight and direct electrical energy generation by photo-electrochemical cells based on nanomaterials are also welcome to be submitted.

Prof. Dr. Tobias Schnabel
Guest Editor

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Keywords

photocatalysts
nanostructures
band gap engineering
photo-electrochemical cells
photocatalytic hydrogen evolution
water contamination
air purification

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13 pages, 4169 KiB

Open AccessArticle

Synergistic Enhancement of Electron Dynamics and Optical Properties in Zeolitic Imidazolate Framework-8-Derived Zinc Oxide via Surface Plasmon Resonance Effects of Silver Nanoparticles under UV Irradiation

by Jaewon Lee and Byoung-Nam Park

Materials 2024, 17(13), 3193; https://doi.org/10.3390/ma17133193 - 29 Jun 2024

Viewed by 359

Abstract

This study investigates the surface plasmon resonance (SPR)-induced UV photoresponse of zinc oxide (ZnO) derived from zeolitic imidazolate framework-8 (ZIF-8) to assess the influence of silver nanoparticles (Ag NPs) on the photoresponse behavior of metal–organic framework (MOF)-derived ZnO. The initial synthesis involved a thermal treatment in air to convert ZIF-8 into ZnO. We noted enhanced optical absorption both in the UV and visible spectra with the deposition of Ag NPs onto the ZIF-8-derived ZnO. Additionally, the presence of Ag NPs in the ZnO resulted in a substantial increase in current, even without any light exposure. This increase is attributed to the transfer of electrons from the Ag NPs to the ZnO. Photocurrent measurements under UV illumination revealed that the photocurrent with Ag NPs was significantly higher—by two orders of magnitude—compared with that without Ag NPs. This demonstrates that SPR-induced absorption markedly boosted the photocurrent, although the current rise and decay time constants remained comparable to those observed with ZnO alone. Although Ag NPs contribute electrons to ZnO, creating a “pre-doping” effect that heightens baseline conductivity (even in the absence of light), this does not necessarily alter the recombination dynamics of the photogenerated carriers, as indicated by the similar rise and decay time constants. The electron transfer from Ag to ZnO increases the density of charge carriers but does not significantly influence their recombination. Full article

(This article belongs to the Special Issue Advanced Science and Technology of Nano-Photocatalytic Materials)

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