Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Fabrication of Copper(II) Oxide Plated Carbon Sponge for Free-standing Resistive Type Gas Sensor and Its Application to Nitric Oxide Detection

프리스탠딩 저항형 가스 센서용 산화구리 무전해 도금 탄소스펀지 제조 및 일산화질소 감지

  • Kim, Seokjin (Chemical Engineering and Applied Chemistry, Chungnam National University) ;
  • Ha, Seongmin (Chemical Engineering and Applied Chemistry, Chungnam National University) ;
  • Myeong, Seongjae (Chemical Engineering and Applied Chemistry, Chungnam National University) ;
  • Lee, Young-Seak (Chemical Engineering and Applied Chemistry, Chungnam National University)
  • 김석진 (충남대학교 응용화학공학과) ;
  • 하성민 (충남대학교 응용화학공학과) ;
  • 명성재 (충남대학교 응용화학공학과) ;
  • 이영석 (충남대학교 응용화학공학과)
  • Received : 2022.10.05
  • Accepted : 2022.10.31
  • Published : 2022.12.10
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Abstract

Copper(II) oxide (CuO), electroless plated on a nitrogen-containing carbon sponge prepared by a melamine sponge thermal treatment, was developed as a nitric oxide (NO) gas sensor that operates without a wafer. The CuO content on the surface of the carbon sponge increased as the plating time increased, but the content of nitrogen known to induce NO gas adsorption decreased. The untreated carbon sponge showed a maximum resistance change (5.0%) at 18 min. On the other hand, the CuO plated sample (CuO30s-CS) showed a maximum resistance change of 18.3% in 8 min. It is considered that the improvement of the NO gas sensing capability was caused by the increase in hole carriers of the carbon sponge and improved movement of electrons due to CuO. However, the NO gas detection resistance of the CuO electroless plated carbon sponge for 60 s decreased to 1.9%. It is considered that the surface of the carbon sponge was completely plated with CuO, resulting in a decrease in the NO gas adsorption capacity and resistance change. Thus, CuO-plated carbon sponge can be used as an effective NO gas sensor because it has fast and excellent resistance change properties, but CuO should not be completely plated on the surface of the carbon sponge.

멜라민 스펀지를 열처리하여 제조된 질소함유 탄소 스펀지에 산화구리(CuO)를 무전해 도금하여 기판없이 작동하는 일산화질소(NO) 가스 센서를 제조하였다. 탄소 스펀지 표면의 CuO 함량은 도금 시간이 증가함에 따라 증가하였으나, NO 가스 흡착을 유도한다고 알려져 있는 질소의 함량은 CuO 표면 함량이 증가함에 따라 감소하였다. 미처리 탄소스펀지는 NO 가스에 대하여 18 min에 최대 저항 변화(5.0%)를 나타내었다. 반면에, CuO가 도금된 샘플(CuO30s-CS)은 8 min만에 최대 18.3%의 저항변화를 보였다. 이러한 NO 가스 감지 능력 향상은 CuO로 인하여 탄소 스펀지의 정공 캐리어 수 증가 및 전자전달 촉진에 기인하는 것으로 판단된다. 그러나, 60 s 동안 CuO 무전해 도금된 탄소 스펀지의 NO가스 감지 저항은 1.9%로 오히려 감소하였다. 이는 탄소 스펀지 표면에 CuO로 완전히 도금되어 NO 가스 흡착 능력이 떨어져 저항변화가 감소한 것으로 판단된다. 따라서, CuO가 도금된 탄소 스펀지는 빠르고 우수한 저항변화 특성을 가지고 있어 유용한 NO 가스 센서로 사용할 수 있으나, CuO가 탄소 스펀지 표면을 완전히 도금해서는 안 된다.

Keywords

Acknowledgement

본 연구는 한국 산업기술평가관리원의 탄소산업기반조성사업(고순도 가스 분리용 탄소분자체 및 시스템 제조기술 개발: 20016789)의 지원에 의하여 수행하였으며 이에 감사드립니다.

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