Super Dielectric Materials of Two-Dimensional TiO2 or Ca2Nb3O10 Nanosheet Hybrids with Reduced Graphene Oxide

Nurun Nahar Rabin, Shintaro Ida, Mohammad Razaul Karim, Md Saidul Islam, Ryo Ohtani, Masaaki Nakamura, Michio Koinuma, Leonard F. Lindoy, Shinya Hayami

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Abstract

High dielectric constants (er) were observed in two-dimensional composites obtained from stacking of reduced graphene oxide (RGO) with Ca2Nb3O10 and with TiO2 nanosheets. The relative dielectric permittivity values of the composites were found to be higher than 105, an amazingly high value compared to that of similar GO composites and other common dielectric materials. As a consequence, we considered application of the hybrids as super dielectric materials in high capacitance supercapacitors. The route to high capacitance involves the variation of oxygen vacancies within the surface and in the closest bulk interior of the hybrids. The effective charges generated throughout the metal oxide and carbon-oxygen polar bonding systems within the graphene skeleton appear to highly influence dielectric polarization. Moreover, the replenishment of oxygen vacancies at the RGO and metal oxide interface also contributes to polarizability.

Original languageEnglish
Pages (from-to)2074-2083
Number of pages10
JournalACS Omega
Volume3
Issue number2
DOIs
Publication statusPublished - Feb 28 2018
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)

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