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ENHANCEMENT IN THE SENSING PROPERTIES OF METHYL ORANGE THIN FILM BY TiO₂ NANOPARTICLES

Faculty of Engineering Sciences, Ghulam Ishaq Khan Institute of Engineering Sciences and Technology, Topi 23640, Pakistan

Department of Physics, Abdul Wali Khan University Mardan, Mardan 23200, Pakistan

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MUHAMMAD HASSAN SAYYAD

Faculty of Engineering Sciences, Ghulam Ishaq Khan Institute of Engineering Sciences and Technology, Topi 23640, Pakistan

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FAZAL WAHAB

Faculty of Engineering Sciences, Ghulam Ishaq Khan Institute of Engineering Sciences and Technology, Topi 23640, Pakistan

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FAZAL AHMAD KHALID

Faculty of Material Sciences and Engineering, Ghulam Ishaq Khan Institute of Engineering Sciences and Technology, Topi 23640, Pakistan

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FAKHRA AZIZ

Department of Electronics, Jinnah College for Women, University of Peshawar, Peshawar 25120, Pakistan

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SHAZIA NAEEM

Department of Physics, Islamia College Peshawar, Peshawar 25120, Pakistan

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, and

MUHAMMAD NAEEM KHALID

Department of Physics, Islamia College Peshawar, Peshawar 25120, Pakistan

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https://doi.org/10.1142/S0217979214500325Cited by:23 (Source: Crossref)

Abstract

This paper reports the enhancement in the sensing properties of organic dye methyl orange (MO) by introducing TiO₂ nanoparticles. For this purpose, two surface type Ag/MO/Ag and Ag/MO:TiO₂/Ag multifunctional sensors were fabricated by spin coating a 3.0 wt.% solution of MO and 3.0:0.3 wt.% of MO:TiO₂ composite on pre-patterned silver (Ag) electrodes. The gap between Ag electrodes was 40 μm. The Ag/MO/Ag and Ag/MO:TiO₂/Ag structures were characterized to investigate their response towards humidity and temperature variations. The Ag/MO:TiO₂/Ag sensor exhibited better sensitivity and response time than Ag/MO/Ag sensor. The large surface to volume ratio of TiO₂ nanoparticles is the primary reason for the higher sensitivity of Ag/MO:TiO₂/Ag sensor. The sensors can be used to detect humidity variations from 30% to 95% RH and temperature variation from 30°C to 200°C with good stability. Surface morphologies of the film were investigated by scanning electron microscope (SEM).

Keywords:

PACS: 92.60.jk, 07.07.Df, 68.37.Hk, 07.20.Ka, 84.37.+q, 81.05.Fb, 82.35.Np, 68.55.J-

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