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

Geunwoo Ko, Younghun Jung, Kwan Young Lee, Ki Bong Lee, Ji Hyun Kim

Research output: Contribution to journalArticle

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 languageEnglish
Pages (from-to)208-211
Number of pages4
JournalJournal of Crystal Growth
Volume326
Issue number1
DOIs
Publication statusPublished - 2011 Jul 1

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Keywords

  • A1. Annealing
  • A1. Graphene
  • A1. Sorption

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Materials Chemistry
  • Inorganic Chemistry

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