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Updated: Jun 1, 2026

Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities
Published on: July 24, 2015
Extremely high response of electrostatically exfoliated few layer graphene to ammonia adsorption
I V Antonova1, S V Mutilin, V A Seleznev
1A V Rzhanov Institute of Semiconductor Physics SB RAS, Novosibirsk, 630090, Russia. antonova@isp.nsc.ru
Abstract:
Extremely high gas sensing properties of p-type few layer graphene flakes exfoliated from highly oriented pyrolytic graphite have been demonstrated. The current response to ammonia adsorption is strongly dependent on film thickness and is higher than that for graphene by 1-8 orders of magnitude. A maximal response was found for sample thickness ∼ 2 nm. The effect is attributed to the formation of multiple p-n-p junctions at the grain boundaries in the polycrystalline graphene flakes exposed to ammonia-containing ambient.
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