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In Situ Detection of Local Structure Transformation of 2D SnSe Nanosheets through Nanothermomechanical Behavior
Physica Status Solidi-Rapid Research Letters ( IF 2.8 ) Pub Date : 2021-03-26 , DOI: 10.1002/pssr.202100121
Zhibin Liu 1, 2 , Kunqi Xu 1 , Huarong Zeng 1, 2 , Zhifu Liu 1, 2 , Kunyu Zhao 1 , Faqiang Zhang 1 , Dong Wang 1, 2 , Yongxiang Li 3
Affiliation  

2D tin selenide (SnSe) is a promising semiconductive material and its thermal stability is one of the most significant evaluating indicators. However, few works are involved in the temperature-dependent structure stability of 2D SnSe nanosheets. Herein, local structure transformation of a 2D SnSe nanosheet into SnSe2 under high temperature is characterized by a novel atomic force microscope (AFM)-based nanoscale thermomechanical method. Based on an AFM platform, the temperature-dependent nanomechanical properties are investigated. A softness process is found to occur upon the surface of 2D SnSe, accompanying the structure transformation under high temperature. It means that the generation of SnSe2 is due to the structure collapse of SnSe, stemming from the evaporation of Sn atoms under about 90 °C. The transformation mechanism is further verified by a real-time nanothermomechanical method. A deeper understanding of the thermal stability and thermal decomposition mechanism of 2D SnSe is promoted. The improved in situ nanomechanical method offers a highly sensitive method to probing the nanomechanical properties of 2D materials.

中文翻译:

通过纳米热机械行为原位检测二维 SnSe 纳米片的局部结构转变

二维硒化锡(SnSe)是一种很有前途的半导体材料,其热稳定性是最重要的评价指标之一。然而,很少有工作涉及二维 SnSe 纳米片的温度依赖性结构稳定性。在此,2D SnSe 纳米片在高温下局部结构转变为 SnSe 2 的特征在于一种新型的基于原子力显微镜 (AFM) 的纳米级热机械方法。基于 AFM 平台,研究了与温度相关的纳米力学性能。发现二维 SnSe 表面发生软化过程,伴随着高温下的结构转变。这意味着 SnSe 2的生成是由于 SnSe 的结构崩溃,源于约 90 °C 下 Sn 原子的蒸发。通过实时纳米热机械方法进一步验证了转化机制。促进了对 2D SnSe 的热稳定性和热分解机制的更深入理解。改进的原位纳米力学方法为探测二维材料的纳米力学特性提供了一种高度灵敏的方法。
更新日期:2021-03-26
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