Negatively­Doped Single­Walled Carbon Nanotubes Decorated with Carbon Dots for Highly Selective NO2 Detection

Title
Negatively­Doped Single­Walled Carbon Nanotubes Decorated with Carbon Dots for Highly Selective NO2 Detection
Authors
변영태임남수이재성
Keywords
Carbon dots; single­walled carbon nanotubes; nitrogen dioxide; gas sensor
Issue Date
2020-12
Publisher
Nanomaterials
Citation
VOL 10-2509-11
Abstract
In this study, we demonstrated a highly selective chemiresistive­type NO2 gas sensorusing facilely prepared carbon dot (CD)­decorated single­walled carbon nanotubes (SWCNTs). TheCD­decorated SWCNT suspension was characterized using transmission electron microscopy(TEM), X­ray diffraction (XRD), and UV­visible spectroscopy, and then spread onto an SiO2/Sisubstrate by a simple and cost­effective spray­printing method. Interestingly, the resistance of oursensor increased upon exposure to NO2 gas, which was contrary to findings previously reported forSWCNT­based NO2 gas sensors. This is because SWCNTs are strongly doped by the electron­richCDs to change the polarity from p­type to n­type. In addition, the CDs to SWCNTs ratio in the activesuspension was critical in determining the response values of gas sensors; here, the 2:1 deviceshowed the highest value of 42.0% in a sensing test using 4.5 ppm NO2 gas. Furthermore, the sensorselectively responded to NO2 gas (response ~15%), and to other gases very faintly (NO, response~1%) or not at all (CO, C6H6, and C7H8). We propose a reasonable mechanism of the CD­decoratedSWCNT­based sensor for NO2 sensing, and expect that our results can be combined with those ofother researches to improve various device performances, as well as for NO2 sensor applications.
URI
http://pubs.kist.re.kr/handle/201004/72611
ISSN
2079-4991
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KIST Publication > Article
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