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

Content Provider	Springer Nature Link
Author	Zhang, Wen Chen, Yongsheng
Copyright Year	2012
Abstract	The ability to determine a semiconductor’s band edge positions is important for the design of new photocatalyst materials. In this paper, we introduced an experimental method based on Kelvin probe force microscopy to determine the conduction and valence band edge energies of semiconductor nanomaterials, which has rarely been demonstrated. We tested the method on six semiconductor nanoparticles (α-Fe$_{2}$O$_{3}$, CeO$_{2}$, Al$_{2}$O$_{3}$, CuO, TiO$_{2}$, and ZnO) with known electronic structures. The experimentally determined band edge positions for α-Fe$_{2}$O$_{3}$, Al$_{2}$O$_{3}$, and CuO well matched the literature values with no statistical difference. Except CeO$_{2}$, all other metal oxides had a consistent upward bias in the experimental measurements of band edge positions because of the shielding effect of the adsorbed surface water layer. This experimental approach may outstand as a unique alternative way of probing the band edge energy positions of semiconductor materials to complement the current computational methods, which often find limitations in new synthetic or complex materials. Ultimately, this work provides scientific foundation for developing experimental tools to probe nanoscale electronic properties of photocatalytic materials, which will drive breakthroughs in the design of novel photocatalytic systems and advance the fundamental understanding of material properties.
Starting Page	1
Ending Page	7
Page Count	7
File Format	PDF
ISSN	13880764
Journal	Journal of Nanoparticle Research
Volume Number	15
Issue Number	1
e-ISSN	1572896X
Language	English
Publisher	Springer Netherlands
Publisher Date	2012-12-04
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Conduction band Valence band Water-splitting Photocatalyst KPFM Work function Nanotechnology Inorganic Chemistry Characterization and Evaluation of Materials Physical Chemistry Optics, Optoelectronics, Plasmonics and Optical Devices
Content Type	Text
Resource Type	Article
Subject	Chemistry Nanoscience and Nanotechnology Atomic and Molecular Physics, and Optics Condensed Matter Physics Bioengineering Modeling and Simulation

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