Poly(vinyl alcohol) nanocomposites containing reduced graphene oxide coated with tannic acid for humidity sensor

Min Young Lim, Huiseob Shin, Dong Myung Shin, Sang-Soo Lee, Jong Chan Lee

Research output: Contribution to journalArticle

43 Citations (Scopus)

Abstract

Poly(vinyl alcohol) (PVA) nanocomposites were prepared by a solution casting method using a reduced graphene oxide coated with tannic acid (rGO-TA) as a filler. The rGO-TA was simply prepared by mixing tannic acid (TA) with graphene oxide (GO). The simple mixing process was found to be effective to reduce GO and to produce covalently-grafted TA layers on the reduced GO. The mechanical properties of PVA were much improved by the addition of rGO-TA because the TA layers increased the compatibility of the reduced GO with PVA matrix. For example, Young's modulus and elongation at break values of PVA were increased by 34.0 and 56.9%, respectively, by adding 1.0 wt% of rGO-TA. In addition, the PVA nanocomposites showed excellent humidity sensing properties over the wide relative humidity range and the long-term stability due to the conductive property of the reduced GO and the enhanced mechanical strength by the effective incorporation of rGO-TA into the PVA matrix.

Original languageEnglish
Pages (from-to)89-98
Number of pages10
JournalPolymer (United Kingdom)
Volume84
DOIs
Publication statusPublished - 2016 Feb 10

Keywords

  • Graphene
  • Humidity sensor
  • Polyvinyl alcohol

ASJC Scopus subject areas

  • Polymers and Plastics
  • Organic Chemistry

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