Formation of a Nanorod-Assembled TiO2 ActinomorphicFlower-like Microsphere Film via Ta Doping Using a Facile Solution Immersion Method for Humidity Sensing

Musa Mohamed Zahidi, Musa Mohamed Zahidi and Mohamad Hafiz Mamat, Mohamad Hafiz Mamat and A Shamsul Rahimi A Subki, A Shamsul Rahimi A Subki and Abdullah, Mohd Hanapiah and Hassan, Hamizura and Mohd Khairul Ahmad, Mohd Khairul Ahmad and Abu Bakar, Suriani and Azmi Mohamed, Azmi Mohamed and Bunsho Ohtani, Bunsho Ohtani (2023) Formation of a Nanorod-Assembled TiO2 ActinomorphicFlower-like Microsphere Film via Ta Doping Using a Facile Solution Immersion Method for Humidity Sensing. Nanomaterials, 13 (256). pp. 1-20.

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Official URL: https://doi.org/10.3390/nano13020256

Abstract

This study fabricated tantalum (Ta)-doped titanium dioxide with a unique nanorodassembled actinomorphic-flower-like microsphere structured film. The Ta-doped TiO2 actinomorphicflower-like microsphere (TAFM) was fabricated via the solution immersion method in a Schott bottle with a home-made improvised clamp. The samples were characterised using FESEM, HRTEM, XRD, Raman, XPS, and Hall effect measurements for their structural and electrical properties. Compared to the undoped sample, the rutile-phased TAFM sample had finer nanorods with an average 42 nm diameter assembled to form microsphere-like structures. It also had higher oxygen vacancy sites, electron concentration, and mobility. In addition, a reversed double-beam photoacoustic spectroscopy measurement was performed for TAFM, revealing that the sample had a high electron trap density of up to 2.5 µmolg1. The TAFM showed promising results when employed as the resistive-type sensing film for a humidity sensor, with the highest sensor response of 53,909% obtained at 3 at.% Ta doping. Adding rGO to 3 at.% TAFM further improved the sensor response to 232,152%.

Item Type:	Article
Uncontrolled Keywords:	semiconductors; sol-gel preparation; TiO2 nanostructure; Ta doping; structural; sensors
Subjects:	T Technology > T Technology (General)
Divisions:	Faculty of Electrical and Electronic Engineering > Department of Electrical Engineering
Depositing User:	Mr. Mohamad Zulkhibri Rahmad
Date Deposited:	30 Oct 2023 07:13
Last Modified:	30 Oct 2023 07:13
URI:	http://eprints.uthm.edu.my/id/eprint/10254

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