Uniform coating of magnesium oxide crystal with reduced graphene oxide achieves moisture barrier performance

Akinori Saito, Seiji Obata, Yuta Nishina

Research output: Contribution to journalArticlepeer-review

Abstract

Magnesium oxide (MgO) has high thermal conductivity while keeping insulation; thus, MgO is attractive material as a filler for thermosetting or thermoplastic resins. However, MgO readily hydrates with water or moisture. Thus, the surface of MgO is coated with organic or inorganic substances. We focused on graphene oxide (GO) as a surface coating agent. It has a 2-dimensional thin sheet structure, oxygen functional groups on the surface, and negative zeta-potential. Typically, GO has been used as a support material for metal nanoparticles. In this research, GO was coated on MgO micro-crystal surface to improve the surface character of MgO. The negatively charged GO and the positively charged MgO were combined with strong interaction. 0.5 wt% GO coated MgO showed excellent moisture resistance compared to organic substances coating. Coating of MgO with GO or reduced GO (rGO) is effective to overcome the weaknesses of MgO. Due to the hydrophilicity and high thermal conductivity of rGO, MgO/rGO composite can be a filler for high moisture resistance and thermal conductivity.

Original languageEnglish
Article number151483
JournalApplied Surface Science
Volume573
DOIs
Publication statusPublished - Jan 30 2022

Keywords

  • Graphene oxide
  • Magnesium oxide
  • Moisture resistance
  • Surface coating

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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