Improved sorption characteristics of NH3 molecules on the solution-processed graphene sheets

Geunwoo Ko; Younghun Jung; Kwan Young Lee; Kibong Lee; Jihyun Kim

doi:10.1016/j.jcrysgro.2011.01.099

Improved sorption characteristics of NH₃ molecules on the solution-processed graphene sheets

Geunwoo Ko, Younghun Jung, Kwan Young Lee, Kibong Lee, Jihyun Kim

Department of Chemical and Biological Engineering

Research output: Contribution to journal › Article › peer-review

15 Citations (Scopus)

Abstract

In this report, we investigated solution-processed graphene chemical sensors. A vacuum-annealing process after the graphene sheets were deposited on the wafer enhanced the response and sensitivity of the sensors by increasing the number of pristine sites on graphene. The presence of defect sites with higher binding energies and lower populations was related with slow adsorption/desorption. In contrast, fast adsorption/desorption were observed from the pristine sites. A two-step adsorption/desorption mechanism was observed when graphene sheets were exposed to ammonia molecules.

Original language	English
Pages (from-to)	208-211
Number of pages	4
Journal	Journal of Crystal Growth
Volume	326
Issue number	1
DOIs	https://doi.org/10.1016/j.jcrysgro.2011.01.099
Publication status	Published - 2011 Jul 1

Keywords

A1. Annealing
A1. Graphene
A1. Sorption

ASJC Scopus subject areas

Condensed Matter Physics
Inorganic Chemistry
Materials Chemistry

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title = "Improved sorption characteristics of NH3 molecules on the solution-processed graphene sheets",

abstract = "In this report, we investigated solution-processed graphene chemical sensors. A vacuum-annealing process after the graphene sheets were deposited on the wafer enhanced the response and sensitivity of the sensors by increasing the number of pristine sites on graphene. The presence of defect sites with higher binding energies and lower populations was related with slow adsorption/desorption. In contrast, fast adsorption/desorption were observed from the pristine sites. A two-step adsorption/desorption mechanism was observed when graphene sheets were exposed to ammonia molecules.",

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author = "Geunwoo Ko and Younghun Jung and Lee, {Kwan Young} and Kibong Lee and Jihyun Kim",

note = "Funding Information: This research was supported by Basic Science Research Program through the National Research Foundation of Korea(NRF) funded by the Ministry of Education, Science and Technology ( 2010-0008242 ).",

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AU - Ko, Geunwoo

AU - Jung, Younghun

AU - Lee, Kwan Young

AU - Lee, Kibong

AU - Kim, Jihyun

N1 - Funding Information: This research was supported by Basic Science Research Program through the National Research Foundation of Korea(NRF) funded by the Ministry of Education, Science and Technology ( 2010-0008242 ).

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AB - In this report, we investigated solution-processed graphene chemical sensors. A vacuum-annealing process after the graphene sheets were deposited on the wafer enhanced the response and sensitivity of the sensors by increasing the number of pristine sites on graphene. The presence of defect sites with higher binding energies and lower populations was related with slow adsorption/desorption. In contrast, fast adsorption/desorption were observed from the pristine sites. A two-step adsorption/desorption mechanism was observed when graphene sheets were exposed to ammonia molecules.

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KW - A1. Sorption

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