Probing the flat band potential and effective electronic carrier density in vertically aligned nitrogen doped diamond nanorods via electrochemical method

Gourav Bhattacharya, Kamatchi Jothiramalingam Sankaran, Shashi B. Srivastava, Joseph Palathinkal Thomas, Sujit Deshmukh, Paulius Pobedinskas, Samarendra P. Singh, Kam Tong Leung, Marlies K. Van Bael, Ken Haenen, Susanta Sinha Roy

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

One-dimensional diamond nanorods (DNRs) were fabricated from nanocrystalline diamond films using a facile combination of microwave plasma enhanced chemical vapor deposition and reactive ion etching (RIE) techniques. Structural and electrochemical properties of undoped and nitrogen doped DNRs were thoroughly investigated. A cyclic voltammetry study revealed the increase in density of charge carriers when doped with nitrogen. Mott Schottky analysis was implemented for the quantitative determination of the flat band potential, effective density of charge carriers and energy band diagram, which revealed that the undoped sample exhibit p-type behavior, whereas the nitrogen doped sample showed n-type behavior. Defect related damage due to graphitization and hydrogen termination in the undoped DNRs (during RIE) was correlated with the p-type conductivity. Nitrogen doping induces n-type conductivity and enhances effective density of charge carriers.

Original languageEnglish
Pages (from-to)68-74
Number of pages7
JournalElectrochimica Acta
Volume246
Early online date6 Jun 2017
DOIs
Publication statusPublished - 20 Aug 2017

Bibliographical note

Funding Information:
Gourav Bhattacharya, Shashi B. Srivastava and Sujit Deshmukh are indebted to Shiv Nadar University for providing scholarships. Kamatchi Jothiramalingam Sankaran and Paulius Pobedinskas are Postdoctoral Fellows of the Research Foundation-Flanders (FWO). The authors are also thankful for financial support from the Alexander von Humboldt Foundation for purchasing the contact angle measurement system and Mr. B. Ruttens, Ms. Hilde Pellaers and Prof. Jan D'Haen for technical and experimental assistance. The Hercules Foundation Flanders is acknowledged for financial support of the Raman equipment.

Publisher Copyright:
© 2017 Elsevier Ltd

Keywords

  • diamond nanorods
  • mott schotkky analysis
  • nitrogen doping
  • reactive ion etching

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