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Reconfigurable Vanadium Dioxide Nanomembranes and Microtubes with Controllable Phase Transition Temperatures
Nano Letters ( IF 9.6 ) Pub Date : 2018-04-10 00:00:00 , DOI: 10.1021/acs.nanolett.8b00483 Ziao Tian 1 , Borui Xu 1 , Bo Hsu 2 , Liliana Stan 3 , Zheng Yang 2 , YongFeng Mei 1
Nano Letters ( IF 9.6 ) Pub Date : 2018-04-10 00:00:00 , DOI: 10.1021/acs.nanolett.8b00483 Ziao Tian 1 , Borui Xu 1 , Bo Hsu 2 , Liliana Stan 3 , Zheng Yang 2 , YongFeng Mei 1
Affiliation
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Two additional structural forms, free-standing nanomembranes and microtubes, are reported and added to the vanadium dioxide (VO2) material family. Free-standing VO2 nanomembranes were fabricated by precisely thinning as-grown VO2 thin films and etching away the sacrificial layer underneath. VO2 microtubes with a range of controllable diameters were rolled-up from the VO2 nanomembranes. When a VO2 nanomembrane is rolled-up into a microtubular structure, a significant compressive strain is generated and accommodated therein, which decreases the phase transition temperature of the VO2 material. The magnitude of the compressive strain is determined by the curvature of the VO2 microtube, which can be rationally and accurately designed by controlling the tube diameter during the rolling-up fabrication process. The VO2 microtube rolling-up process presents a novel way to controllably tune the phase transition temperature of VO2 materials over a wide range toward practical applications. Furthermore, the rolling-up process is reversible. A VO2 microtube can be transformed back into a nanomembrane by introducing an external strain. Because of its tunable phase transition temperature and reversible shape transformation, the VO2 nanomembrane-microtube structure is promising for device applications. As an example application, a tubular microactuator device with low driving energy but large displacement is demonstrated at various triggering temperatures.
中文翻译：
具有可控相变温度的可重构二氧化钒纳米膜和微管
据报道，另外两种结构形式是独立的纳米膜和微管，并将其添加到二氧化钒（VO 2）材料族中。通过精确地减薄已生长的VO 2薄膜并蚀刻掉其下方的牺牲层来制造自立式VO 2纳米膜。从VO 2纳米膜上卷起具有一定直径范围的VO 2微管。当将VO 2纳米膜卷成微管结构时，会产生很大的压缩应变并容纳在其中，从而降低了VO 2的相变温度材料。压缩应变的大小由VO 2微管的曲率确定，可以通过在卷起制造过程中控制管直径来合理而准确地设计VO 2微管。VO 2微管卷起工艺提供了一种新颖的方法，可控制VO 2材料的相变温度，从而在实际应用中实现较宽的调节范围。此外，汇总过程是可逆的。通过引入外部应变，VO 2微管可以转变回纳米膜。由于其可调的相变温度和可逆的形状转换，VO 2纳米膜-微管结构在设备应用中很有前途。作为示例应用，在各种触发温度下展示了具有低驱动能量但排量大的管状微致动器装置。
更新日期：2018-04-10
中文翻译：
具有可控相变温度的可重构二氧化钒纳米膜和微管
据报道，另外两种结构形式是独立的纳米膜和微管，并将其添加到二氧化钒（VO 2）材料族中。通过精确地减薄已生长的VO 2薄膜并蚀刻掉其下方的牺牲层来制造自立式VO 2纳米膜。从VO 2纳米膜上卷起具有一定直径范围的VO 2微管。当将VO 2纳米膜卷成微管结构时，会产生很大的压缩应变并容纳在其中，从而降低了VO 2的相变温度材料。压缩应变的大小由VO 2微管的曲率确定，可以通过在卷起制造过程中控制管直径来合理而准确地设计VO 2微管。VO 2微管卷起工艺提供了一种新颖的方法，可控制VO 2材料的相变温度，从而在实际应用中实现较宽的调节范围。此外，汇总过程是可逆的。通过引入外部应变，VO 2微管可以转变回纳米膜。由于其可调的相变温度和可逆的形状转换，VO 2纳米膜-微管结构在设备应用中很有前途。作为示例应用，在各种触发温度下展示了具有低驱动能量但排量大的管状微致动器装置。
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