화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Korean Journal of Materials Research, Vol.21, No.8, 468-475, August, 2011
DOI10.3740/MRSK.2011.21.8.468  Export Citation
Polymeric Precursor법에 의한 LaMeO3 (Me = Cr, Co)의 제조 및 NOx 가스 검지 특성
Fabrication and NOx Gas Sensing Properties of LaMeO3 (Me = Cr, Co) by Polymeric Precursor Method
이영성, Y. Shimizu1, 송정환2, †
  • 배재대학교 재료공학과
  • 1큐슈공업대학 응용화학과
  • 2배재대학교 정보전자소재공학과
Young-Sung Lee, Y. Shimizu1, and Jeong-Hwan Song2, †
  • Department of Materials Engineering, Graduate School of PaiChai University, Daejeon 302-735, Korea
  • 1Department of Applied Chemistry, Graduate School of Kyushu Institute of Technology, Kitakyushu 804-8550, Japan, Korea
  • 2Department of Information and Electronic Materials Engineering, PaiChai University, Daejeon 302-735, Korea
E-mail:
LaMeO3 (Me = Cr, Co) powders were prepared using the polymeric precursor method. The effects of the chelating agent and the polymeric additive on the synthesis of the LaMeO3 perovskite were studied. The samples were synthesized using ethylene glycol (EG) as the solvent, acetyl acetone (AcAc) as the chelating agent, and polyvinylpyrrolidone (PVP) as the polymer additive. The thermal decomposition behavior of the precursor powder was characterized using a thermal analysis (TGDTA). The crystallization and particle sizes of the LaMeO3 powders were investigated via powder X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), and particle size analyzer, respectively. The as-prepared precursor primarily has LaMeO3 at the optimum condition, i.e. for a molar ratio of both metal-source (a : a) : EG (80 a : 80 a) : AcAc (8 a) inclusive of 1 wt% PVP. When the as-prepared precursor was calcined at 700oC, only a single phase was observed to correspond with the orthorhombic structure of LaCrO3 and the rhombohedral structure of LaCoO3. A solid-electrolyte impedance-metric sensor device composed of Li1.5Al0.5Ti1.5(PO4)3 as a transducer and LaMeO3 as a receptor has been systematically investigated for the detection of NOx in the range of 20 to 250 ppm at 400oC. The sensor responses were able to divide the component between resistance and capacitance. The impedance-metric sensor for the NO showed higher sensitivity compared with NO2. The responses of the impedance-metric sensor device showed dependence on each value of the NOx concentration.
Keywords:LaMe( =Cr;Co)O3;NOx sensor;polymeric precursor;acetyl acetone;PVP
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