Humidity Sensing Properties of Plasticized CA-NH4BF4-PEG600 Thin Films

 

Nurhana Ilmira Harun1, Siti Sumaiyah Sheikh Abdul Aziz1, Nunshaimah Salleh1,  Syamsyir Akmal Senawi2, Azhan Hashim2, Siti Nor Hafiza Mohd Yusoff3, Ab Malik Marwan Ali4 and Muhd Zu Azhan Yahya5

 

1Faculty of Applied Sciences, Universiti Teknologi MARA Perak, Kampus Tapah, 35400 Tapah Road, Tapah, Perak, Malaysia

 

2Faculty of Applied Sciences, Universiti Teknologi MARA Pahang, 26400 Bandar Tun Razak Jengka, Pahang, Malaysia

 

3Faculty of Applied Sciences, Universiti Teknologi MARA Johor, Kampus Pasir Gudang, Jalan Purnama, Bandar Seri Alam, 81750 Masai, Johor.

 

4Faculty of Applied Sciences, Universiti Teknologi MARA,

40450 Shah Alam,  Malaysia

 

5Faculty of Defence Science & Technology, National Defence University of Malaysia, Kem Sg.Besi, 57000 Kuala Lumpur, Malaysia

 

Corresponding author: nurhanailmira@perak.uitm.edu.my

 

Abstract

 

The fabrication of resistive-type humidity sensor based on CA-NH4BF4-PEG600 plasticized polymer electrolytes film was prepared by using dip-coating method on a glass substrate. The electrical properties of the film are examined as a function of relative humidity (R.H) to clarify its potential as a humidity sensor. The sensor well-responded towards humidity showing that the resistance drops with the increase in relative humidity, thus confirmed that the resistive-sensor exhibits humidity–sensitive property. The sensor element has also been characterized in terms of the effect of applied frequency in the range of 100 Hz to 10 kHz. The values of resistance show the decrement with increasing in frequency. Apart from frequency dependence, the measurement has also been carried out at different temperature elevation between 30°C and 50°C. The value of resistance decreases with increasing temperature as a result of ion mobility enhancement at higher temperature. The temperature dependence of resistance obeys Arrhenius law and the activation energy decreases with increasing in relative humidity. These entire behaviours can be explained by the conduction process occurred in CA-NH4BF4-PEG600 films.

 

Keywords: Dip-coating method; Plasticized polymer electrolytes; Resistive-type humidity sensor

 

 

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