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

ABSTRACT: High dielectric constants (?r) 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.

SUBMITTER: Rabin NN 

PROVIDER: S-EPMC6641247 | biostudies-literature | 2018 Feb

REPOSITORIES: biostudies-literature

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Super Dielectric Materials of Two-Dimensional TiO<sub>2</sub> or Ca<sub>2</sub>Nb<sub>3</sub>O<sub>10</sub> Nanosheet Hybrids with Reduced Graphene Oxide.

Rabin Nurun Nahar NN   Ida Shintaro S   Karim Mohammad Razaul MR   Islam Md Saidul MS   Ohtani Ryo R   Nakamura Masaaki M   Koinuma Michio M   Lindoy Leonard F LF   Hayami Shinya S  

ACS omega 20180221 2

High dielectric constants (ε<sub>r</sub>) were observed in two-dimensional composites obtained from stacking of reduced graphene oxide (RGO) with Ca<sub>2</sub>Nb<sub>3</sub>O<sub>10</sub> and with TiO<sub>2</sub> nanosheets. The relative dielectric permittivity values of the composites were found to be higher than 10<sup>5</sup>, 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  ...[more]

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