TY - GEN
T1 - Impact of hydrogen on carrier mobility and concentration in graphene decorated with Pd nanoparticle
AU - Goto, Akihito
AU - Takeuchi, Go
AU - Yamachi, Ryosuke
AU - Tanaka, Takahisa
AU - Takahashi, Tsunaki
AU - Uchida, Ken
N1 - Funding Information:
This work is partly supported by CREST, JST.
Publisher Copyright:
© The Electrochemical Society.
PY - 2016
Y1 - 2016
N2 - 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.
AB - 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.
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U2 - 10.1149/07214.0007ecst
DO - 10.1149/07214.0007ecst
M3 - Conference contribution
AN - SCOPUS:85019681537
SN - 9781623323837
T3 - ECS Transactions
SP - 7
EP - 12
BT - Graphene and Beyond
A2 - Arnold, M.
A2 - Grebel, H.
A2 - Hirsch, A.
A2 - Martel, R.
A2 - Obeng, Y. S.
PB - Electrochemical Society Inc.
T2 - Symposium on Graphene and Beyond: 2D Materials - 229th ECS Meeting
Y2 - 29 May 2016 through 2 June 2016
ER -