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Adsorption of ammonia on graphene.
Nanotechnology. 2009 Jun 17; 20(24):245501.N

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 NH3 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 approximately 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 SiO2 that we identify with a Fickian diffusion process.

Authors+Show Affiliations

Department of Physics, Pennsylvania State University, University Park, PA 16802, USA.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, U.S. Gov't, Non-P.H.S.

Language

eng

PubMed ID

19468162

Citation

Romero, Hugo E., et al. "Adsorption of Ammonia On Graphene." Nanotechnology, vol. 20, no. 24, 2009, p. 245501.
Romero HE, Joshi P, Gupta AK, et al. Adsorption of ammonia on graphene. Nanotechnology. 2009;20(24):245501.
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
Romero HE, et al. Adsorption of Ammonia On Graphene. Nanotechnology. 2009 Jun 17;20(24):245501. PubMed PMID: 19468162.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Adsorption of ammonia on graphene. AU - Romero,Hugo E, AU - Joshi,Prasoon, AU - Gupta,Awnish K, AU - Gutierrez,Humberto R, AU - Cole,Milton W, AU - Tadigadapa,Srinivas A, AU - Eklund,Peter C, Y1 - 2009/05/26/ PY - 2009/5/27/entrez PY - 2009/5/27/pubmed PY - 2009/7/25/medline SP - 245501 EP - 245501 JF - Nanotechnology JO - Nanotechnology VL - 20 IS - 24 N2 - 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 NH3 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 approximately 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 SiO2 that we identify with a Fickian diffusion process. SN - 1361-6528 UR - https://www.unboundmedicine.com/medline/citation/19468162/Adsorption_of_ammonia_on_graphene_ L2 - https://doi.org/10.1088/0957-4484/20/24/245501 DB - PRIME DP - Unbound Medicine ER -