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Multi-Walled Carbon Nanotubes (MWCNT) 인쇄박막의 제작과 화학센서 동작 특성에 관한 연구
노재하,최준석,고동완,서준영,이상태,정정열,장지호,Noh, Jae Ha,Choi, Junseck,Ko, Dongwan,Seo, Joonyoung,Lee, Sangtae,Jung, Jung-Yeul,Chang, Jiho 한국전기전자재료학회 2020 전기전자재료학회논문지 Vol.33 No.3
Hazardous and noxious substance (HNS) detection sensors were fabricated using multi-walled carbon nanotubes (MWCNTs) and various binder materials for ion batteries. To obtain uniformly printed films, the printing precision according to the substrate cleaning method was monitored, and the printing paste mixing ratio was investigated. Binders were prepared using styrene butadiene rubber + carboxymethyl cellulose (SBR+CMC), polyvinylidene fluoride + n-methyl-2-pyrrolidene (PVDF+NMP), and mixed with MWCNTs. The surface morphology of the printed films was examined using an optical microscope and a scanning electron microscope, and their electrical properties are investigated using an I-V sourcemeter. Finally, sensing properties of MWCNT printed films were measured according to changes in the concentration of the chemical under the various applied voltages. In conclusion, the MWCNT printed films made of (SBR+CMC) were found to be feasible for application to the detection of hazardous and noxious chemicals spilled in seawater.
CNT 필름 전기화학 센서의 온도 의존 특성에 관한 연구
노재하,안형수,안상수,이창한,이상태,이문진,서동민,장지호 한국센서학회 2022 센서학회지 Vol.31 No.3
In this study, we investigated a carbon nanotube (CNT) film sensor to detect hazardous and noxious substances distributed in seawater. The response change of the sensor was studied according to environmental temperature, and its temperature coefficient of resistance (TCR, α) was measured. The temperature of the CNT film (~50 µm) was in the range of 20–50oC, and αCNT was calculated to be −0.0011 %/oC. We experimentally confirmed that the CNT film had a smaller TCR value than that of the conventional sensor. Therefore, we investigated the response change of the CNT sensor according to temperature. The CNT sensor showed a relatively small error of approximately 2.3 % up to 30oC, which is within the temperature range of the seawater of the Korean Peninsula. However, when the temperature exceeded 40oC, the error in the CNT sensor increased by more than 5.2 %. We fabricated a metal oxide (ITO, indium-tin-oxide) film and compared its performance with that of the CNT sensor. The ITO sensor showed an error of >12.5 % at 30oC, indicating that in terms of the stability of the sensor to temperature, the CNT film sensor has superior performance.
Carbon Nanotube Film을 이용한 액체 전기화학 센서
노재하 ( Jaeha Noh ),안상수 ( Sangsu An ),이창한 ( Changhan Lee ),이상태 ( Sangtae Lee ),이문진 ( Moonjin Lee ),서동민 ( Dongmin Seo ),장지호 ( Jiho Chang ) 한국센서학회 2021 센서학회지 Vol.30 No.4
We studied electrochemical sensors using printed carbon nanotube (CNT) film on a polyethylene terephthalate (PET) substrate. Multiwalled CNT films were printed on a PET substrate to study its feasibility as hazardous and noxious substances (HNS) detection sensor. The printed CNT film (PCF) with a 50 μm thickness exhibited a specific resistance of 230 ohm. To determine the optimum sensor structure, a resistance-type PCF sensor (R-type PCF sensor) and a conductive-type PCF sensor (C-type PCF sensor) were fabricated and compared using diluted NH3 droplets with various concentrations. The response magnitude, response time, sensitivity, linearity, and limit of detection (LOD) were compared, and it was concluded that the C-type PCF sensor exhibited superior performance. By applying a C-Type PCF sensor, we confirmed the detection performance of 12 types of floating HNS and the response of the sensor with selectivity according to the degree of polarity.