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Download fileSynthesis of Interface-Driven Tunable Bandgap Metal Oxides
journal contribution
posted on 24.08.2020, 17:37 authored by Boyce
S. Chang, Andrew Martin, Brijith Thomas, Ang Li, Rick W. Dorn, Jinlong Gong, Aaron J. Rossini, Martin M. ThuoMixed 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.
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Keywords
CO 2 reductionnetwork percolatingheat treatmentmaterialbandgap tunabilitystoichiometrically tunable band str...tandem structuresconversion ratesInterface-Driven Tunable Bandgap Me...formationgap statesCH 4gC -β-Ga 2 O 3Composition alterationssingle-crystal epitaxial growthcoordination polymersoxidative ligand ablationcarbon depositionbandgap metal oxidestop-down processgraphitic C-doped mesoporous oxidesgC-In 2 O 3