Capacitive type humidity sensor based on PANI decorated Cu-ZnS porous microspheres

Hemalatha Parangusan; Jolly Bhadra; Zubair Ahmad; Shoaib Mallick; Farid Touati; Noora Al-Thani

doi:10.1016/j.talanta.2020.121361

Capacitive type humidity sensor based on PANI decorated Cu-ZnS porous microspheres

Talanta. 2020 Nov 1:219:121361. doi: 10.1016/j.talanta.2020.121361. Epub 2020 Jul 7.

Authors

Hemalatha Parangusan¹, Jolly Bhadra¹, Zubair Ahmad¹, Shoaib Mallick², Farid Touati², Noora Al-Thani³

Affiliations

¹ Centre for Advanced Materials (CAM), Qatar University, P.O. Box 2713, Doha, Qatar.
² Department of Electrical Engineering, College of Engineering, Qatar University, P.O. Box 2713, Doha, Qatar.
³ Centre for Advanced Materials (CAM), Qatar University, P.O. Box 2713, Doha, Qatar. Electronic address: n.al-thani@qu.edu.qa.

PMID: 32887084
DOI: 10.1016/j.talanta.2020.121361

Abstract

Porous microstructure materials are considered good candidates for the development of highly sensitive and fast humidity sensors. In this regard, we prepared polyaniline (PANI) decorated Cu-ZnS porous microsphere structures (PMSs) for the fabrication of humidity sensors. PANI coated Cu-ZnS PMSs were synthesized by a hydrothermal method and in situ polymerization process. The synthesized PMSs were characterized by different techniques to study the structural, morphological and surface absorption properties. Several compositions for the PANI/Cu-ZnS PMS were investigated, which were then compared with pure PANI. The experimental observations demonstrate that a PANI/1%Cu-ZnS PMS has better sensitivity, fast response and good stability compared to pure PANI and other PANI/CuZnS compositions. Finally, a PANI/1% Cu-ZnS PMS was found to be optimized for humidity sensors due to its well distributed roughness, porosity and hydrophilicity. The average response and recovery times for PANI/1% Cu-ZnS were found to be 42 s and 24 s, respectively, which outperform recent results.

Keywords: Capacitive humidity sensing; Composite; Humidity sensor; Sensitivity.