Switchable semiconductive property of the polyhydroxylated metallofullerene

Jun Tang, Gengmei Xing, Yuliang Zhao, Long Jing, Hui Yuan, Feng Zhao, Xueyun Gao, Haijie Qian, Run Su, Kurash Ibrahim, Weiguo Chu, Lina Zhang, Katsumi Tanigaki

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)

Abstract

The temperature-sensitive property of polyhydroxylated metallofullerene film of Gd@C82(OH)x with special hydroxyl number was studied using synchrotron radiation ultraviolet photoelectron spectroscopy (UPS) and TEM techniques. From room temperature (RT) to 4 °C the photoelectron onset energy of the spectra of Gd@C82(OH)12 shifted from 1.9 to 0.2 eV, indicating that Gd@C82(OH)12 automatically shifted from insulator at RT to semiconductor at 4 °C. However, this could not be observed for Gd@C82(OH)20. TEM experiments show that the variation of conductivity can be ascribed to formation of a microcrystal under low temperature. The dipole moment induced unique intermolecular interactions and self-assembled microcrystalline structures for Gd@C82(OH12. This may cause reconstruction of the upper valence band formed by π-like electrons as well as the density of states (DOS) around the Fermi level (EF) and reconstruct the deeper valence band formed by σ-like electrons, eventually resulting in a shift to a semiconducting nature. These findings revealed a novel nature for polyhydroxylated Gd@C82(OH)x materials: Their insulating properties can be controllably tuned into semiconducting ones as a function of temperature.

Original languageEnglish
Pages (from-to)11929-11934
Number of pages6
JournalJournal of Physical Chemistry B
Volume111
Issue number41
DOIs
Publication statusPublished - 2007 Oct 18

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

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