Ultra-sensitive graphene sensor for measuring high vacuum pressure

Collection with item attached
2017
Item details URL
http://open-repository.kisti.re.kr/cube/handle/open_repository/486673.do
DOI
10.1038/s41598-017-13038-3
Title
Ultra-sensitive graphene sensor for measuring high vacuum pressure
Description
This research was financially supported by the Ministry of Education(MOE) and National Research Foundation of Korea (NRF) through ResearchPrograms (No. 2016R1D1A1B03930387 and 2013M3C1A3065469).
abstract
We demonstrate here that several different graphene nanoribbon ( GNR) samples can be separated from the GNR mixture synthesized by conventional methods. The sheet resistance of the purified GNR gradually decreased with decreasing pressure at 30 degrees C, whereas it increased at 100 degrees C. A hypothesis based on van der Waals attractive interactions between GNR sheets was introduced to explain this finding. This hypothesis verified by the shifted main peaks in vacuum X-ray diffraction spectra: 0.022 nm and 0.041 nm shifts were observed for reduced graphene oxide ( RGO) and GNR, respectively. Theoretical calculations indicated that, for RGO, the shifted distance was similar to the calculated distance. The response of the GNR sensor to pressure changes occurred rapidly ( in seconds). The normalized response time of each sample indicated that sensor using GNR reduced the tailing of the response time by shortening the diffusion path of gas molecules. The sensitivity of the GNR sensor was three times that of RGO in the given pressure range. Moreover, the sensitivity of GNR was much larger than those of the most popularly studied pressure sensors using Piezoresistivity, and the sensor could detect vacuum pressures of 8 x 10(-7) Torr.
provenance
Made available in Cube on 2018-09-28T16:13:53Z (GMT). No. of bitstreams: 0
language
English
author
Il Ahn, Sung
Jung, Ju Ra
Choi, So Young
Son, Min Hwa
Hong, Yu Jin
Park, Jung-Chul
orcid
Ahn, Sung Il/0000-0002-9026-5277
accessioned
2018-09-28T16:13:53Z
available
2018-09-28T16:13:53Z
issued
2017
citation
SCIENTIFIC REPORTS(7)
issn
2045-2322
uri
http://open-repository.kisti.re.kr/cube/handle/open_repository/486673.do
Funder
과학기술정보통신부
Funding Program
STEAM연구
Project ID
1711051534
Jurisdiction
Rep.of Korea
Project Name
Development and Evaluation of Highly Efficient Materials for Fiber OLED
rights
openAccess
type
article


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