Charge-transfer doped intrinsic diamond electrochemical electrodes

Waileong Chen, Chiuan Yi Li, Shoupu Yeh, Shin Hung Yei, Yonhua Tzeng

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

2 Citations (Scopus)

Abstract

We report electrochemical characteristics of hydrogen terminated charge-transfer doped intrinsic microcrystalline diamond films. Microcrystalline diamond was synthesized by Direct-Current Plasma Enhanced Chemical Vapor Deposition (DC-PECVD) in methane diluted by hydrogen. The diamond films were subjected to further treatment by microwave plasma in pure hydrogen to increase the hydrogen termination of the diamond surfaces and their negative electron affinity. When the diamond is exposed to the ambient moisture, valance electrons tend to tunnel from the first few atomic layers of the diamond surface to the adsorbed water adlayer. This charge transfer process results in the surface of hydrogen-terminated diamond behaving like a p-type semiconductor. Electrochemical characteristics of hydrogen-terminated diamond films were exposed to an air plasma for depleting the surface hydrogen atoms and then re-hydrogenated the same diamond films with atomic hydrogen. Cyclic voltammetry in 0.1M H 2SO 4 aqueous solution and 0.01M Fe(CN) 6 -4/-3+0.1M KCl aqueous solution was applied to reveal high current density and wide potential window for hydrogen-terminated diamond grown on silicon substrates. The faceted surface morphology has been observed by SEM. The crystalline characteristics and carbon phases in the diamond film were examined by Raman spectroscopy.

Original languageEnglish
Title of host publicationCarbon Functional Interfaces
Pages81-86
Number of pages6
DOIs
Publication statusPublished - 2011
Event2011 MRS Spring Meeting - San Francisco, CA, United States
Duration: 2011 Apr 252011 Apr 29

Publication series

NameMaterials Research Society Symposium Proceedings
Volume1362
ISSN (Print)0272-9172

Other

Other2011 MRS Spring Meeting
CountryUnited States
CitySan Francisco, CA
Period11-04-2511-04-29

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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  • Cite this

    Chen, W., Li, C. Y., Yeh, S., Yei, S. H., & Tzeng, Y. (2011). Charge-transfer doped intrinsic diamond electrochemical electrodes. In Carbon Functional Interfaces (pp. 81-86). (Materials Research Society Symposium Proceedings; Vol. 1362). https://doi.org/10.1557/opl.2011.1282