用STM尖端定向滑动实现石墨烯的局部应变诱导纳米双皱

IF 10.5 2区材料科学 Q1 CHEMISTRY, PHYSICAL

Carbon Pub Date : 2025-04-04 DOI:10.1016/j.carbon.2025.120299

Yuang Li, Xueyan Li, Jiaqi Yang, Yi Pan

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引用次数: 0

摘要

通过应变工程在石墨烯上制造纳米级褶皱是一种将奇异的电子和光电子特性引入材料的有效策略。然而，在表面的特定位置实现原子精度的局部应变是一个挑战。在此，我们报告了一种局部应变工程方法，通过扫描隧道显微镜（STM）在高有序热解石墨（HOPG）上的单层石墨烯尖端定向滑动来构建纳米皱纹。独特的平行双皱形成，由于滑动引起的位移被锁定在瞬间形成的键在边缘。它们也可以通过施加电压脉冲来释放边缘锁定来去除。扫描调谐光谱揭示了褶皱上典型的van Hove奇点峰的一维量子特征，而高分辨率图像的快速傅里叶变换（FFT）分析揭示了褶皱附近各向异性残余拉伸和压缩应力引起的层内晶格畸变和层间扭曲。此外，由于拉伸应力破坏了石墨烯的键对称，褶皱上的结构扭结在控制尖端接触的情况下产生，从而在扭结附近诱导出局部的kekul键序。我们的工作提供了一种通过局部应变工程实现层状二维材料所需物理性能的新技术。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Local strain induced nanoscale double-wrinkles in graphene realized by STM tip-directed sliding

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Local strain induced nanoscale double-wrinkles in graphene realized by STM tip-directed sliding

Creating nano-scale wrinkles in graphene by strain engineering is an effective strategy to introduce exotic electronic and optoelectronic properties into the material. However, it's challenging to realize atomic precision local strain at specific locations on the surface. Herein, we report on a local strain engineering approach to building nano-wrinkles by scanning tunneling microscope (STM) tip-directed sliding of the monolayer graphene on highly ordered pyrolytic graphite (HOPG). Unique parallel double wrinkles are formed due to the sliding caused displacement being locked by the instantly formed bonds at the edge. They can also be removed by applying a voltage pulse to release the edge locking. Scanning tunning spectra reveals typical 1D quantum characteristics of van Hove singularity peaks on the wrinkles, while fast Fourier transform (FFT) analysis of high-resolution image reveals intralayer lattice distortion and interlayer twisting caused by anisotropic residual tensile and compressive stresses in the vicinity of the wrinkles. Additionally, structural kinks on the wrinkles have been created by controlled tip contact, which induces local Kekulé bond order near the kink due to the tensile stress breaking the bond symmetry of graphene. Our work provides a new technique to realize desired physical properties via local strain engineering of layered 2D materials.

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来源期刊

Carbon 工程技术-材料科学：综合

CiteScore

20.80

自引率

7.30%

发文量

审稿时长

23 days

期刊介绍： The journal Carbon is an international multidisciplinary forum for communicating scientific advances in the field of carbon materials. It reports new findings related to the formation, structure, properties, behaviors, and technological applications of carbons. Carbons are a broad class of ordered or disordered solid phases composed primarily of elemental carbon, including but not limited to carbon black, carbon fibers and filaments, carbon nanotubes, diamond and diamond-like carbon, fullerenes, glassy carbon, graphite, graphene, graphene-oxide, porous carbons, pyrolytic carbon, and other sp2 and non-sp2 hybridized carbon systems. Carbon is the companion title to the open access journal Carbon Trends. Relevant application areas for carbon materials include biology and medicine, catalysis, electronic, optoelectronic, spintronic, high-frequency, and photonic devices, energy storage and conversion systems, environmental applications and water treatment, smart materials and systems, and structural and thermal applications.