中国物理B ›› 2023, Vol. 32 ›› Issue (11): 117801-117801.doi: 10.1088/1674-1056/ace425

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Unveiling localized electronic properties of ReS2 thin layers at nanoscale using Kelvin force probe microscopy combined with tip-enhanced Raman spectroscopy

Yu Luo(罗宇)1, Weitao Su(苏伟涛)1,†, Juanjuan Zhang(张娟娟)2,‡, Fei Chen(陈飞)3, Ke Wu(武可)1, Yijie Zeng(曾宜杰)1, and Hongwei Lu(卢红伟)1   

  1. 1 School of Sciences, Hangzhou Dianzi University, Hangzhou 310018, China;
    2 Hunan Petrochemical Vocational Technology College, Yueyang 414011, China;
    3 College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, China
  • 收稿日期:2023-04-24 修回日期:2023-07-01 接受日期:2023-07-05 出版日期:2023-10-16 发布日期:2023-10-16
  • 通讯作者: Weitao Su, Juanjuan Zhang E-mail:suweitao@hdu.edu.cn;josephy881006@163.com
  • 基金资助:
    Project supported by the Zhejiang Provincial Natural Science Foundation of China (Grant No. LZ22A040003) and the National Natural Science Foundation of China (Grant No. 52027809).

Unveiling localized electronic properties of ReS2 thin layers at nanoscale using Kelvin force probe microscopy combined with tip-enhanced Raman spectroscopy

Yu Luo(罗宇)1, Weitao Su(苏伟涛)1,†, Juanjuan Zhang(张娟娟)2,‡, Fei Chen(陈飞)3, Ke Wu(武可)1, Yijie Zeng(曾宜杰)1, and Hongwei Lu(卢红伟)1   

  1. 1 School of Sciences, Hangzhou Dianzi University, Hangzhou 310018, China;
    2 Hunan Petrochemical Vocational Technology College, Yueyang 414011, China;
    3 College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, China
  • Received:2023-04-24 Revised:2023-07-01 Accepted:2023-07-05 Online:2023-10-16 Published:2023-10-16
  • Contact: Weitao Su, Juanjuan Zhang E-mail:suweitao@hdu.edu.cn;josephy881006@163.com
  • Supported by:
    Project supported by the Zhejiang Provincial Natural Science Foundation of China (Grant No. LZ22A040003) and the National Natural Science Foundation of China (Grant No. 52027809).

摘要: Electronic properties of two-dimensional (2D) materials can be strongly modulated by localized strain. The typical spatial resolution of conventional Kelvin probe force microscopy (KPFM) is usually limited in a few hundreds of nanometers, and it is difficult to characterize localized electronic properties of 2D materials at nanoscales. Herein, tip-enhanced Raman spectroscopy (TERS) is proposed to combine with KPFM to break this restriction. TERS scan is conducted on ReS2 bubbles deposited on a rough Au thin film to obtain strain distribution by using the Raman peak shift. The localized contact potential difference (CPD) is inversely calculated with a higher spatial resolution by using strain measured by TERS and CPD-strain working curve obtained using conventional KPFM and atomic force microscopy. This method enhances the spatial resolution of CPD measurements and can be potentially used to characterize localized electronic properties of 2D materials.

关键词: few layer ReS2, tip enhanced Raman spectroscopy, local strain, Kelvin probe force microscopy

Abstract: Electronic properties of two-dimensional (2D) materials can be strongly modulated by localized strain. The typical spatial resolution of conventional Kelvin probe force microscopy (KPFM) is usually limited in a few hundreds of nanometers, and it is difficult to characterize localized electronic properties of 2D materials at nanoscales. Herein, tip-enhanced Raman spectroscopy (TERS) is proposed to combine with KPFM to break this restriction. TERS scan is conducted on ReS2 bubbles deposited on a rough Au thin film to obtain strain distribution by using the Raman peak shift. The localized contact potential difference (CPD) is inversely calculated with a higher spatial resolution by using strain measured by TERS and CPD-strain working curve obtained using conventional KPFM and atomic force microscopy. This method enhances the spatial resolution of CPD measurements and can be potentially used to characterize localized electronic properties of 2D materials.

Key words: few layer ReS2, tip enhanced Raman spectroscopy, local strain, Kelvin probe force microscopy

中图分类号:  (Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures)

  • 78.67.-n
07.79.Fc (Near-field scanning optical microscopes) 07.79.Lh (Atomic force microscopes)