Adsorption of ammonia on graphene

Hugo E. Romero, Prasoon Joshi, Awnish K. Gupta, Humberto R. Gutierrez, Milton W. Cole, Srinivas A. Tadigadapa, Peter C. Eklund

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141 Scopus citations

Abstract

We report on experimental studies of NH3 adsorption/desorption on graphene surfaces. The study employs bottom-gated graphene field effect transistors supported on Si/SiO2 substrates. Detection of NH 3 occurs through the shift of the source-drain resistance maximum ('Dirac peak') with the gate voltage. The observed shift of the Dirac peak toward negative gate voltages in response to NH3 exposure is consistent with a small charge transfer (f∼0.068 0.004 electrons per molecule at pristine sites) from NH3 to graphene. The desorption kinetics involves a very rapid loss of NH3 from the top surface and a much slower removal from the bottom surface at the interface with the SiO 2 that we identify with a Fickian diffusion process.

Original languageEnglish (US)
Article number245501
JournalNanotechnology
Volume20
Issue number24
DOIs
StatePublished - Jun 29 2009

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Electrical and Electronic Engineering

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    Romero, H. E., Joshi, P., Gupta, A. K., Gutierrez, H. R., Cole, M. W., Tadigadapa, S. A., & Eklund, P. C. (2009). Adsorption of ammonia on graphene. Nanotechnology, 20(24), [245501]. https://doi.org/10.1088/0957-4484/20/24/245501