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Study and Preparation of Gold Modified Tungsten Tip for Tip-enhanced Raman Spectroscopy |
DU Bo-lin1,2,GAO Si-tian2,HUANG Lu2,SHI Yu-shu2,QU Xing-hua1 |
1. College of Precision Instrument and Opto-electronics Engineering, Tianjin University, Tianjin 300072, China
2. National Institute of Metrology, Beijing 100029, China |
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Abstract A gold modified tungsten tip for tip-enhanced Raman spectroscopy(TERS) is proposed and the preparation method is studied. An inner arc-shaped tip was designed through finite element analysis,and then modified with a gold nano-particles layer after a silicon dioxide bonding layer was deposited. The tungsten tips were prepared by adjusting the concentration of solution, motor displacement and immersion depth of the electrochemical corrosion probe device developed by the laboratory independently. Based on the design, an inductively coupled plasma chemical vapor deposition(ICP-CVD) technology was employed to deposit the SiO2 coating, and the electron beam physical vapor deposition(EB-PVD) to prepare the gold nanoparticles layer. Finally, the preparation of the tip is completed, and the radius of the tip after double coating is 30~80nm,which can be used for TERS research.
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Received: 22 November 2019
Published: 08 December 2020
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