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Article

On improved inorganic gas-sensing characteristics of microwave-treated tungsten oxide quantum dots at room temperature

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Date of Issue

2025

Publisher

John Wiley

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Abstract

Tungsten oxide (WO3) based metal oxide semiconductor material has been conventionally used for sensing inorganic gases at elevated temperatures. However, in this study, the gas sensing performance of tungsten oxide-based sensors is evaluated at room temperature. In this study, WO3 quantum dots (QDs) are synthesized via the electrochemical method, followed by a microwave treatment to dehydrate them. The newly developed process is relatively less expensive and offers the flexibility to alter the structure in terms of phase, size, shape, and vacancy concentration. It is observed that electrochemical process parameters play an important role in phase evolution and control the oxygen vacancy concentration in the powder, which are essential for enhancing its gas sensing characteristics. Results showed an enhanced gas-sensing ability of WO3 QDs at room temperature toward inorganic gases, such as CO, NO2, NH3, and H2 when subjected to microwave treatment. The enhanced gas-sensing performance of microwave-treated WO3 QDs is attributed to its smaller size and high oxygen vacancy concentration. The minimum limit of detection values for CO, NO2, NH3, and H2 at room temperature using microwave-treated hydrated tungsten oxide QDs were 4.60, 1.5, 0.35, and 10.25�ppm, respectively.

Keywords

Aluminum nitride; Cadmium compounds; Carrier concentration; Cobalt compounds; Gas sensing electrodes; II-VI semiconductors; Masers; Metal oxide ceramics; Microwave sensors; Oxide semiconductors; Semiconductor quantum dots; Wide band gap semiconductors; Gas sensing; Gas sensing characteristics; Inorganic gas; Microwave treatment; NH 3; NO 2; Oxygen vacancy concentration; Quantum dot; Sensing performance; Tungsten oxide; Nanocrystals

Journal Name

International Journal of Applied Ceramic Technology