Structurally nanocrystalline-electrically single crystalline zno-reduced graphene oxide composites

Woo Hyun Nam, Bo Bae Kim, Seul Gi Seo, Young Soo Lim, Jong Young Kim, Won Seon Seo, Won Kook Choi, Hyung Ho Park, Jeong Yong Lee

Research output: Contribution to journalArticlepeer-review

62 Citations (Scopus)


ZnO, a wide bandgap semiconductor, has attracted much attention due to its multifunctionality, such as transparent conducting oxide, light-emitting diode, photocatalyst, and so on. To improve its performances in the versatile applications, numerous hybrid strategies of ZnO with graphene have been attempted, and various synergistic effects have been achieved in the ZnO-graphene hybrid nanostructures. Here we report extraordinary charge transport behavior in Al-doped ZnO (AZO)-reduced graphene oxide (RGO) nanocomposites. Although the most challenging issue in semiconductor nanocomposites is their low mobilities, the AZO-RGO nanocomposites exhibit single crystal-like Hall mobility despite the large quantity of nanograin boundaries, which hinder the electron transport by the scattering with trapped charges. Because of the significantly weakened grain boundary barrier and the proper band alignment between the AZO and RGO, freely conducting electrons across the nanograin boundaries can be realized in the nanocomposites. This discovery of the structurally nanocrystalline-electrically single crystalline composite demonstrates a new route for enhancing the electrical properties in nanocomposites based on the hybrid strategy.

Original languageEnglish
Pages (from-to)5104-5109
Number of pages6
JournalNano letters
Issue number9
Publication statusPublished - 2014 Sept 10

Bibliographical note

Publisher Copyright:
© 2014 American Chemical Society.

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering


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