Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Preparation and Heating Characteristics of N-doped Graphite Fiber as a Heating Element

질소가 도핑 된 흑연섬유 발열체의 제조 및 발열특성

  • Kim, Min-Ji (Department of Applied Chemistry and Biological Engineering, Chungnam National University) ;
  • Lee, Kyeong Min (Department of Applied Chemistry and Biological Engineering, Chungnam National University) ;
  • Lee, Sangmin (Department of Applied Chemistry and Biological Engineering, Chungnam National University) ;
  • Yeo, Sang Young (Korea Institute of Industrial Technology (KITECH)) ;
  • Choi, Suk Soon (Department of Biological and Environmental Engineering, Semyung University) ;
  • Lee, Young-Seak (Department of Applied Chemistry and Biological Engineering, Chungnam National University)
  • 김민지 (충남대학교 응용화학공학과) ;
  • 이경민 (충남대학교 응용화학공학과) ;
  • 이상민 (충남대학교 응용화학공학과) ;
  • 여상영 (한국생산기술연구원) ;
  • 최석순 (세명대학교 바이오환경공학과) ;
  • 이영석 (충남대학교 응용화학공학과)
  • Received : 2016.11.21
  • Accepted : 2016.12.03
  • Published : 2017.02.10
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Abstract

In this study, nitrogen functional groups were introduced on graphite fiber (GF) to modify their electrical properties, and heating properties were investigated according to the treatment conditions. GF was prepared by a thermal solid-state reaction at $200^{\circ}C$ for 2 h. Surface properties of the nitrogen doped GF were examined by XPS, and its resistance and heating temperature were measured using a programmable electrometer and thermo-graphic camera, respectively. The XPS result showed that the nitrogen functional groups on the GF surface were increased with increasing of urea contents, and the heating property of the GF was also improved as nitrogen functional groups were introduced. The maximum heating temperature of GF treated by urea was $53.8^{\circ}C$ at 60 V, which showed 55% improved heating characteristics compared to that of non-treated GF. We ascribe this effect to introduced nitrogen functional groups on the GF surface by thermal solid-state reaction, which significantly affects the heating characteristics of GF.

본 연구에서는 흑연섬유(GF)의 전기적 특성을 변화시키기 위하여 질소관능기 도입을 실시하였고, 처리조건에 따라 흑연섬유의 발열성능을 평가하였다. 흑연섬유는 $200^{\circ}C$에서 2 h 동안 열-고상반응법으로 처리되었다. 질소도핑 된 흑연섬유의 표면특성은 XPS로 조사되었으며, 저항 및 발열온도는 전위계 시스템과 열화상카메라를 이용하여 측정하였다. XPS 결과 우레아 함량이 증가함에 따라 흑연섬유 표면의 질소관능기가 증가하였으며, 이 질소관능기가 도입됨에 따라서 흑연섬유의 발열특성이 또한 향상되었다. 우레아 처리된 흑연섬유의 최대 발열온도는 60 V에서 $53.8^{\circ}C$로 나타났으며, 이는 미처리 흑연섬유와 비교하여 발열특성이 약 55% 향상됨을 알 수 있었다. 이러한 효과는 열고상반응법에 의해서 흑연섬유 표면에 도입된 질소관능기 때문에 기인한 것으로, 이는 흑연섬유의 열적 특성에 상당히 영향을 주었다.

Keywords

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