Synthesis of photochromic nanoparticles and determination of the mechanism of photochromism
Source abstract
Abstract
Photochromic nanoparticles of zinc-silicon oxide were synthesized using plasma enhanced chemical vapor deposition. These particles turned black upon irradiating with ultraviolet light. We investigated this phenomenon using density functional theory calculations. Silicon inclusions create trap levels and oxygen defects that reduce the ionization potential of ZnO. This forms a quantum potential between ZnO and zinc-silicon oxide, and the excited electron is stable. Because oxygen defects also increase the bond overlap population between the zinc atoms in a ZnO crystal, they introduce further defects and help in the formation of quantum potentials. Growth of a perfect crystal of ZnO prevents the formation of oxygen defects, which is not desirable for photochromism.
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Research context
OpenAlex topics: Photochromic and Fluorescence Chemistry · Gold and Silver Nanoparticles Synthesis and Applications · Transition Metal Oxide Nanomaterials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Hiroshima University 1 Division of Energy and Environmental Engineering, , Higashi-Hiroshima, 739-8527, Japan
Hiroshima University 2 Department of Mechanical Science and Engineering, , 739-8527, Japan
Kyushu University 3 Department of Applied Science for Electronics Materials, , Kasuga, 816-8580, Japan
Kansai University 4 Faculty of Engineering Science, , Suita, 564-8680, Japan
Tokushima Bunri University 5 Department of Nano Material and Bio Engineering, , Sanuki, 769-2193, Japan
Funding
Japan Society for the Promotion of Science
References (41)
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