Campus Units

Chemistry, Electrical and Computer Engineering, Materials Science and Engineering, Ames Laboratory, Microelectronics Research Center (MRC)

Document Type

Article

Publication Version

Submitted Manuscript

Publication Date

8-17-2020

Journal or Book Title

ACS Materials Letters

DOI

10.1021/acsmaterialslett.0c00251

Abstract

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.

Comments

This document is the unedited Author’s version of a Submitted Work that was subsequently accepted for publication in ACS Materials Letters, copyright © American Chemical Society after peer review. To access the final edited and published work see DOI: 10.1021/acsmaterialslett.0c00251. Posted with permission.

Copyright Owner

American Chemical Society

Language

en

File Format

application/pdf

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