In2O3 doped WO3 powders were prepared by a polymer solution route and their NO2 gas sensing properties were analyzed. The synthesized powders showed nano-sized particles with specific surface areas of 6.01~21.5 m2/g and the particle size and shape changed according to the content of In2O3. The gas sensors fabricated with the synthesized powders were tested at operating temperatures of 400~500 oC and 100~500 ppm concentrations of NO2 atmosphere. The particle size and In2O3 content affected on the initial sensor resistance in an air atmosphere. The highest sensitivity (8.57 at 500 oC), which was 1.77 higher than the sensor consisting of the pure WO3 sample, was measured in the 0.5 mol% In2O3 doping sample. In addition, the response time and recovery time were improved by the addition of In2O3.

1. 서 론
 2. 실험 방법
  2.1 분말 합성
  2.2 센서 테스트
 3. 결과 및 고찰
  3.1 분말 특성
  3.2 센서 특성
 4. 결 론
 References

• 김동민(국립목포대학교 신소재공학과) | Dong Min Kim (Department of Advanced Materials Science and Engineering, Mokpo National University)
• 이상진(1국립목포대학교 신소재공학과, 2국립목포대학교 세라믹산업기술연구소) | Sang-Jin Lee (1Department of Advanced Materials Science and Engineering, Mokpo National University, 2Research Institute of Ceramic Industry and Technology, Mokpo National University) Corresponding author