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New aspects of size-dependent metal-insulator transition in synthetic single-domain monoclinic vanadium dioxide nanocrystals

2011; Royal Society of Chemistry; Volume: 3; Issue: 10 Linguagem: Inglês

10.1039/c1nr10976f

2040-3372

Yongfu Sun, Shishi Jiang, Wentuan Bi, Ran Long, X. L. Tan, Changzheng Wu, Shiqiang Wei, Yi Xie,

Gas Sensing Nanomaterials and Sensors

Nanoscale materials with size smaller than the characteristic domain size could simplify the domain structure and uncover the intrinsic properties in detail. Herein, a ultrafast open space calcination pathway is first put forward to synthesize high-quality single-domain VO2(M) nanocrystals and an in situ variable-temperature IR spectroscopy is first proposed to identify the size-dependent MIT behaviors in VO2(M) below single-domain size. The variable-temperature IR spectroscopy clearly reveals that these single-domain VO2(M) nanocrystals exhibit new size-dependent MIT behaviors, while the IR analysis further suggests that the size-related defect density and scattering efficiency could be used to account for their novel size-dependent MIT behaviors. This new characterization strategy of in situ variable-temperature IR spectroscopy holds great promise for extending to other systems to gain valuable insight into their intrinsic phase transition behaviors. Also, this ultrafast open space calcination pathway sets forth a new avenue in fabricating high-quality functional nanocrystals and paves the way for constructing intelligent nanodevices in the near future.