在几乎独立的VO2纳米线中，热导率在相变过程中存在显著的热滞后

IF 3.6 2区物理与天体物理 Q2 PHYSICS, APPLIED

Applied Physics Letters Pub Date : 2025-10-10 DOI:10.1063/5.0286216

Yong Li, Fushan Wang, Junyao Yin, Hao Tang, Juekuan Yang

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引用次数: 0

摘要

采用热桥法，在相变温度附近测量了近乎独立的VO2纳米线的导热系数。研究发现，在315 ~ 355 K温度范围内，冷却时测得的导热系数明显大于加热时测得的导热系数。光学成像和拉曼研究证实，明显的滞后是由冷却过程中较大的相变温度范围引起的。然而，这种行为在箝位的VO2纳米线中不存在，这表明即使很小的热应力也可以改变VO2纳米线在相变过程中的热行为。

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Remarkable thermal hysteresis of thermal conductivity in nearly freestanding VO2 nanowire across the phase transition

The thermal conductivity of a nearly freestanding VO2 nanowire was measured in the vicinity of phase transition temperature using thermal bridge method. It was discovered that the thermal conductivity measured during cooling can be significantly greater than during heating in the temperature range of 315–355 K. The pronounced hysteresis results from a large phase transition temperature range during cooling as confirmed by optical imaging and Raman studies. However, this behavior was absent in clamped VO2 nanowires, suggesting that even small thermal stress can change the thermal behavior of VO2 nanowires during phase transition.

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来源期刊

Applied Physics Letters 物理-物理：应用

CiteScore

6.40

自引率

10.00%

发文量

1821

审稿时长

1.6 months

期刊介绍： Applied Physics Letters (APL) features concise, up-to-date reports on significant new findings in applied physics. Emphasizing rapid dissemination of key data and new physical insights, APL offers prompt publication of new experimental and theoretical papers reporting applications of physics phenomena to all branches of science, engineering, and modern technology. In addition to regular articles, the journal also publishes invited Fast Track, Perspectives, and in-depth Editorials which report on cutting-edge areas in applied physics. APL Perspectives are forward-looking invited letters which highlight recent developments or discoveries. Emphasis is placed on very recent developments, potentially disruptive technologies, open questions and possible solutions. They also include a mini-roadmap detailing where the community should direct efforts in order for the phenomena to be viable for application and the challenges associated with meeting that performance threshold. Perspectives are characterized by personal viewpoints and opinions of recognized experts in the field. Fast Track articles are invited original research articles that report results that are particularly novel and important or provide a significant advancement in an emerging field. Because of the urgency and scientific importance of the work, the peer review process is accelerated. If, during the review process, it becomes apparent that the paper does not meet the Fast Track criterion, it is returned to a normal track.