Synthesis of photochromic nanoparticles and determination of the mechanism of photochromism

Shuhei Inoue, Takahiro Kawamoto, Yukihiko Matsumura, Kentaro Tomita, Kiichiro Uchino, Keiji Takata, Hiroshi Kajiyama

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

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.

Original languageEnglish
Article number055214
JournalAIP Advances
Volume6
Issue number5
DOIs
Publication statusPublished - May 1 2016

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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