• CN: 11-2187/TH
  • ISSN: 0577-6686

Journal of Mechanical Engineering ›› 2022, Vol. 58 ›› Issue (21): 349-360.doi: 10.3901/JME.2022.21.349

Previous Articles    

Study on Fabrication of Composite SERS Substrate Based on Vicker Tip

ZHANG Jingran1, LU Siwei1, JIA Tianqi1, SHI Guangfeng1, LI Jing1, ZHANG Xinming1, YAN Yongda2   

  1. College of Mechanical and Electrical Engineering, Changchun University of Science and Technology, Changchun 130022;
    2. Center for Precision Engineering, Harbin Institute of Technology, Harbin 150001
  • Received:2021-11-14 Revised:2022-06-28 Online:2022-11-05 Published:2022-12-23

Abstract: Based on the tip-based continuous indentation process, the arrayed rectangular pyramidal cavities are successfully machined on the copper-based graphene sample surface. The structured copper-based graphene surface is coated with a thin Au film, which is used as the composite SERS substrate. Different shapes of arrayed micro/nano structures are formed by the overlap of rectangular pyramidal cavities with different adjacent distances using the tip-based continuous indentation process. Experimental results show that the Raman intensity of the Au film coated copper-based graphene substrate is influenced by the topographies of these micro/nano structures. The overlap of graphene is generated during indentation process and the number of layer of graphene is increased with the lower distances. The Raman intensity of R6G molecules is influenced by the ratio (S) of the depth and the width of the rectangular pyramidal cavities with different adjacent distances. The Raman intensity of 610 cm-1R6G molecules is 1 439 counts with the S of 0.043. The relative standard deviation (RSD) of the Raman intensity of R6G molecule is 6.16% (pile-ups) and 9.19% (cavities). The detection limit of carbaryl and paraquat is 10-6and 10−5mol/L, respectively. The method proposed is reliable and low cost for the fabrication of composite SERS substrates and can realize the detection of pesticide residues with low concentration.

Key words: rectangular pyramidal cavities, copper-based graphene surface, carbaryl, Rhodamine 6G, SERS

CLC Number: