Impact of hydrogen on carrier mobility and concentration in graphene decorated with Pd nanoparticle

Akihito Goto, Go Takeuchi, Ryosuke Yamachi, Takahisa Tanaka, Tsunaki Takahashi, Ken Uchida

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

2 Citations (Scopus)

Abstract

As a candidate of highly-sensitive hydrogen sensors, Palladium (Pd)-decorated graphene sensors have been investigated. Thanks to high reactivity of Pd nanoparticles to hydrogen and high surface-tovolume ratio of two-dimensionally layered graphene, graphene decorated with Pd nanoparticles can be used as a highly sensitive hydrogen sensor. Although the conductivity of Pd-graphene sensor is known to be greatly changed in hydrogen atmosphere, the mechanisms of conductivity change have not been fully understood. In this work, both carrier concentration and mobility in hydrogen are investigated using Hall effect measurement. It is shown that relative change of carrier concentration is greater when carrier concentration is lower. On the other hand, mobility is not systematically changed as a function of carrier concentration. This mobility behavior is attributed to the competition between greater effective mass and shorter screening length at higher carrier concentration. Based on these observations, we develop strategy for achieving high sensitivity in Pd graphene hydrogen sensor.

Original languageEnglish
Title of host publicationGraphene and Beyond
Subtitle of host publication2D Materials
PublisherElectrochemical Society Inc.
Pages7-12
Number of pages6
Volume72
Edition14
ISBN (Electronic)9781607685395
DOIs
Publication statusPublished - 2016
EventSymposium on Graphene and Beyond: 2D Materials - 229th ECS Meeting - San Diego, United States
Duration: 2016 May 292016 Jun 2

Other

OtherSymposium on Graphene and Beyond: 2D Materials - 229th ECS Meeting
CountryUnited States
CitySan Diego
Period16/5/2916/6/2

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ASJC Scopus subject areas

  • Engineering(all)

Cite this

Goto, A., Takeuchi, G., Yamachi, R., Tanaka, T., Takahashi, T., & Uchida, K. (2016). Impact of hydrogen on carrier mobility and concentration in graphene decorated with Pd nanoparticle. In Graphene and Beyond: 2D Materials (14 ed., Vol. 72, pp. 7-12). Electrochemical Society Inc.. https://doi.org/10.1149/07214.0007ecst