Experimental determination of conduction and valence bands of semiconductor nanoparticles using Kelvin probe force microscopy

Wen Zhang, Yongsheng Chen

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The ability to predict a semiconductor's band edge positions in solution is important for the design of photocatalyst materials. In this paper, we introduce an experimental method based on Kelvin probe force microscopy (KPFM) to estimate the conduction and valence band edge energies of semiconductors, which has never been demonstrated experimentally. We test the method on six well known semiconductor materials: α-Fe 2O 3, CeO 2, Al 2O 3, CuO, TiO 2, and ZnO. The predicted band edge positions for α-Fe 2O 3, Al 2O 3, and CuO were not statistically different from the literature values. Except CeO 2, all other metal oxides had consistent upward bias in the experimental determination of band edge positions probably because of the potential shielding effect of the adsorbed surface water layer. This experimental approach represents a unique way of probing the band edge energy positions of metal oxide materials without using the thermodynamic information (e.g., enthalpy or entropy), which is often not available for new synthetic or complex materials.

Original languageEnglish (US)
Title of host publicationTechnical Proceedings of the 2012 NSTI Nanotechnology Conference and Expo, NSTI-Nanotech 2012
Pages9-12
Number of pages4
StatePublished - Aug 20 2012
Externally publishedYes
EventNanotechnology 2012: Advanced Materials, CNTs, Particles, Films and Composites - 2012 NSTI Nanotechnology Conference and Expo, NSTI-Nanotech 2012 - Santa Clara, CA, United States
Duration: Jun 18 2012Jun 21 2012

Publication series

NameTechnical Proceedings of the 2012 NSTI Nanotechnology Conference and Expo, NSTI-Nanotech 2012

Other

OtherNanotechnology 2012: Advanced Materials, CNTs, Particles, Films and Composites - 2012 NSTI Nanotechnology Conference and Expo, NSTI-Nanotech 2012
CountryUnited States
CitySanta Clara, CA
Period6/18/126/21/12

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Surfaces, Coatings and Films

Keywords

  • Conduction band
  • KPFM
  • Photocatalyst
  • Valence band
  • Water-splitting
  • Work function

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