Optimization of aluminum dopant amalgamation immersion time on structural, electrical, and humidity-sensing attributes of pristine ZnO for flexible humidity sensor application

Mamat, Mohamad Hafiz and A Subki, A Shamsul Rahimi and Mohamed Zahidi, Musa and Abdullah, Mohd Hanapiah and Shameem Banu, Itreesh Basha and Vasimalai, Nagamalai and Ahmad, Mohd Khairul and Nayan, Nafarizal and Abu Bakar, Suriani and Mohamed, Azmi and Birowosuto, Muhammad Danang and Mahmood, Mohamad Rusop (2022) Optimization of aluminum dopant amalgamation immersion time on structural, electrical, and humidity-sensing attributes of pristine ZnO for flexible humidity sensor application. Chemosensors, 10 (11). pp. 1-36. ISSN 2227-9040

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Abstract

This study synthesized pristine and aluminum (Al)-doped zinc oxide (Al:ZnO) nanostructures through a simplistic low-temperature ultrasonicated solution immersion method. Al:ZnO nanostructures were synthesized as a sensing material using different immersion times varying from two to five hours. The Al:ZnO nanostructured-based flexible humidity sensor was fabricated by employing cellulose filter paper as a substrate and transparent paper glue as a binder through a simplistic brush printing technique. XRD, FESEM, HRTEM, EDS, XPS, a two-probe I–V measurement system, and a humidity measurement system were employed to investigate the structural,morphological, chemical, electrical, and humidity-sensing properties of the pristine ZnO and Al:ZnO nanostructures. The structural and morphological analysis confirmed that Al cations successfully occupied the Zn lattice or integrated into interstitial sites of the ZnO lattice matrix. Humidity-sensing performance analysis indicated that the resistance of the Al:ZnO nanostructure samples decreased almost linearly as the humidity level increased, leading to better sensitivity and sensing response. The Al:ZnO-4 h nanostructured-based flexible humidity sensor had a maximum sensing response and demonstrated the highest sensitivity towards humidity changes, which was noticeably superior to the other tested samples. Finally, this study explained the Al:ZnO nanostructures-based flexible humidity sensor sensing mechanism in terms of chemical adsorption, physical adsorption, and capillary condensation mechanisms.

Item Type:	Article
Uncontrolled Keywords:	Zinc oxide nanopowders, Aluminum-doped zinc oxide, Flexible humidity sensor, Cellulose, Resistive-type humidity sensor
Divisions:	Faculty of Electrical and Electronic Engineering Technology
Depositing User:	Norfaradilla Idayu Ab. Ghafar
Date Deposited:	11 Jul 2024 09:25
Last Modified:	11 Jul 2024 09:25
URI:	http://eprints.utem.edu.my/id/eprint/27465
Statistic Details:	View Download Statistic

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