Journal of Sensor Science and Technology (센서학회지)

The Korean Sensors Society (한국센서학회)
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Preparation of Manganese Oxide Porous Nanostructures using Amino-acid and its Selective C3H8 Sensing Properties

아미노산을 이용한 망간 산화물 기공성 나노 구조의 합성 및 C3H8 가스에 대한 선택적 감응 특성

  • Choi, Kwon-Il (Department of Materials Science and Engineering, Korea University) ;
  • Lee, Jong-Heun (Department of Materials Science and Engineering, Korea University)
  • Received : 2010.11.15
  • Accepted : 2011.01.19
  • Published : 2011.01.31
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Abstract

Porous manganese oxide porous nanostructures were prepared by amino-acid-mediated solvothermal self assembly reaction and subsequent heat treatment at $600^{\circ}C$. When Mn-precursors were heat-treated at $400-550^{\circ}C$, the sensors did not show significant gas responses. In contrast, the manganese oxide heat-treated at $600^{\circ}C$ showed the significant gas responses, that is, the resistance decrease to 100 ppm $C_3H_8$ ($R_a/R_g$ = 2.17, $R_a$ : resistance in air, $R_g$ : resistance in gas) and the resistance increase to 100 ppm $C_2H_5OH$ ($R_g/R_a$ = 1.92). The opposite change of resistance upon exposure to $C_3H_8$ and $C_2H_5OH$ was discussed in relation to the mixed phases of manganese oxides with different valences.

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References

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