Tip-Enhanced Raman Scattering Imaging of Two-Dimensional TungstenDisulfide with Optimized Tip Fabrication Process

Collection with item attached
2017
Item details URL
http://open-repository.kisti.re.kr/cube/handle/open_repository/486295.do
DOI
10.1038/srep40810
Title
Tip-Enhanced Raman Scattering Imaging of Two-Dimensional TungstenDisulfide with Optimized Tip Fabrication Process
Description
This work was supported by IBS-R011-D1 and the Human ResourcesDevelopment program (No. 20124010203270) of the Korea Institute ofEnergy Technology Evaluation and Planning (KETEP) grant funded by theKorean government Ministry of Trade, Industry and Energy. This researchwas also supported by the Hallym University Research Fund,2016[HRF-201609-006]. We are also grateful to Yongmin Kim, a faculty ofthe Department of Applied Physics, Dankook University, for insightfuldiscussions.
abstract
We successfully achieve the tip-enhanced nano Raman scattering images of a tungsten disulfide monolayer with optimizing a fabrication method of gold nanotip by controlling the concentration of etchant in an electrochemical etching process. By applying a square-wave voltage supplied from an arbitrary waveform generator to a gold wire, which is immersed in a hydrochloric acid solution diluted with ethanol at various ratios, we find that both the conical angle and radius of curvature of the tip apex can be varied by changing the ratio of hydrochloric acid and ethanol. We also suggest a model to explain the origin of these variations in the tip shape. From the systematic study, we find an optimal condition for achieving the yield of similar to 60% with the radius of similar to 34 nm and the cone angle of similar to 35 degrees. Using representative tips fabricated under the optimal etching condition, we demonstrate the tip-enhanced Raman scattering experiment of tungsten disulfide monolayer grown by a chemical vapor deposition method with a spatial resolution of similar to 40 nm and a Raman enhancement factor of similar to 4,760.
provenance
Made available in Cube on 2018-09-28T16:03:46Z (GMT). No. of bitstreams: 0
language
English
author
Lee, Chanwoo
Kim, Sung Tae
Jeong, Byeong Geun
Yun, Seok Joon
Song, Young Jae
Lee, Young Hee
Park, Doo Jae
Jeong, Mun Seok
orcid
Jeong, Mun Seok/0000-0002-7019-8089
accessioned
2018-09-28T16:03:46Z
available
2018-09-28T16:03:46Z
issued
2017
citation
SCIENTIFIC REPORTS(7)
issn
2045-2322
uri
http://open-repository.kisti.re.kr/cube/handle/open_repository/486295.do
Funder
과학기술정보통신부
Funding Program
기초과학연구원연구운영비지원
Project ID
1711061426
Jurisdiction
Rep.of Korea
Project Name
Integrated Nanostructure Physics Research
rights
openAccess
type
article


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