Humidity sensing behaviour of polyaniline/magnesium chromate (MgCrO4) composite

Bulletin of materials science

T Machappa²  M V N Ambika Prasad¹ 

[1] Department of Physics, Ballari Institute of Technology & Management, Bellary 583 104, India$$Department of Materials Science and Physics, Gulbarga University, Gulbarga 585 106, India$$Department of Physics, Ballari Institute of Technology & Management, Bellary 583 104, IndiaDepartment of Physics, Ballari Institute of Technology & Management, Bellary 583 104, India$$Department of Materials Science and Physics, Gulbarga University, Gulbarga 585 106, India$$Department of Materials Science and Physics, Gulbarga University, Gulbarga 585 106, IndiaDepartment of Physics, Ballari Institute of Technology & Management, Bellary 583 104, India$$Department of Materials Science and Physics, Gulbarga University, Gulbarga 585 106, India$$;Department of Physics, Ballari Institute of Technology & Management, Bellary 583 104, India$$Department of Physics, Ballari Institute of Technology & Management, Bellary 583 104, IndiaDepartment of Physics, Ballari Institute of Technology & Management, Bellary 583 104, India$$

关键词: Polyaniline;    ceramic;    magnesium chromate;    humidity sensor.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

â€�?in situ’ polymerization of polyaniline (PANI) was carried out in the presence of magnesium chromate (MgCrO₄) to synthesize PANI/ceramic (MgCrO₄) composite. These prepared composites were characterized by XRD, FTIR and SEM, which confirm the presence of MgCrO₄ in polyaniline matrix. The temperature dependent conductivity measurement shows the thermally activated exponential behaviour of PANI /MgCrO₄ composites. The decrease in electrical resistance was observed when the polymer composites were exposed to the broad range of relative humidity (ranging between 20 and 95% RH). This decrease is due to increase in surface electrical conductivity resulting from moisture absorption and due to capillary condensation of water causing change in conductivity within the sensing materials. PANI / MgCrO₄ composites are found to be sensitive to low humidity ranging from 20 to 50% RH.

【 授权许可】

Unknown