Synthesis of Interface-Driven Tunable Bandgap Metal Oxides

Boyce S. Chang, Andrew Martin, Brijith Thomas, Ang Li, Rick W. Dorn, Jinlong Gong, Aaron J. Rossini, Martin M. Thuo

Research output: Contribution to journalArticlepeer-review


Mixed bandgap and bandgap tunability in semiconductors is critical in expanding their use. Composition alterations through single-crystal epitaxial growth and the formation of multilayer tandem structures are often employed to achieve mixed bandgaps, albeit with limited tunability. Herein, self-assembled one-dimensional coordination polymers provide facile synthons and templates for graphitic C-doped mesoporous oxides, gC-β-Ga2O3 or gC-In2O3 via controlled oxidative ligand ablation. These materials have mixed bandgaps and colors, depending on amount of gC present. The carbon/oxide interface leads to induced gap states, hence, a stoichiometrically tunable band structure. Structurally, a multiscale porous network percolating throughout the material is realized. The nature of the heat treatment and the top-down process allows for facile tunability and the formation of mixed bandgap metal oxides through controlled carbon deposition. As a proof of concept, gC-β-Ga2O3 was utilized as a photocatalyst for CO2 reduction, which demonstrated excellent conversion rates into CH4 and CO.

Original languageEnglish (US)
Pages (from-to)1211-1217
Number of pages7
JournalACS Materials Letters
Issue number9
StatePublished - Sep 8 2020

ASJC Scopus subject areas

  • General Chemical Engineering
  • Biomedical Engineering
  • General Materials Science


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