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

Mohamed Zahidi, Musa and Mamat, Mohamad Hafiz and A Shamsul Rahimi A Subki, A Shamsul Rahimi A Subki and Abdullah, Mohd Hanapiah and Hassan, Hamizura and Ahmad, Mohd Khairul and Abu Bakar, Suriani and Mohamed, Azmi 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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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 > FKEE
Depositing User: Mr. Mohamad Zulkhibri Rahmad
Date Deposited: 16 Jan 2024 07:27
Last Modified: 16 Jan 2024 07:27
URI: http://eprints.uthm.edu.my/id/eprint/10724

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