Hefei National Laboratory for Physical Sciences at Microscale, University of Science & Technology of China, Hefei 230026, P.R. China.
Nanoscale. 2011 Oct 5;3(10):4394-401. doi: 10.1039/c1nr10976f. Epub 2011 Sep 8.
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 VO(2)(M) nanocrystals and an in situ variable-temperature IR spectroscopy is first proposed to identify the size-dependent MIT behaviors in VO(2)(M) below single-domain size. The variable-temperature IR spectroscopy clearly reveals that these single-domain VO(2)(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.
具有小于特征畴尺寸的尺寸的纳米材料可以简化畴结构并详细揭示内在性质。在此，首次提出了超快开放空间煅烧途径来合成高质量的单畴 VO(2)(M)纳米晶体，并首次提出了原位变温红外光谱来在单畴尺寸以下的 VO(2)(M)中识别尺寸相关的 MIT 行为。变温红外光谱清楚地表明，这些单畴 VO(2)(M)纳米晶体表现出新的尺寸相关的 MIT 行为，而红外分析进一步表明，与尺寸相关的缺陷密度和散射效率可用于解释其新的尺寸相关的 MIT 行为。这种原位变温红外光谱的新表征策略有望扩展到其他系统，以深入了解其内在的相变行为。此外，这种超快开放空间煅烧途径为制造高质量的功能纳米晶体开辟了新途径，并为在不久的将来构建智能纳米器件铺平了道路。
