Collection of scientific works Nanosystems, nanomaterials, nanotechnologies
Year 2026 Volume 24, Issue 1
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Huda SAADI ALI1 and Zuheer N. MAJEED2

1College of Energy and Environmental Sciences, Department of Renewable Energy, Al-Karkh University of Science, Baghdad, Iraq
2College of Education for Women, Kirkuk University, Kirkuk, Iraq

Synthesis and Characterization of Nano-CdO:SnO2 Thin Film for Gas-Sensing Applications

211–224 (2026)

PACS numbers: 07.07.Df, 78.20.Ci, 78.66.Li, 79.20.Ds, 81.15.Fg, 81.16.Mk, 87.85.fk

Received 26 September, 2024; in revised form, 20 November, 2024

Motivated by the utility of gas-sensing technology, investigations of thin films of the tin oxide-doped cadmium oxide (CdO:SnO2) of nanograin size in the range between 10.3 nm and 18.3 nm have been undertaken applying different characterization methods. CdO films doped with nano-SnO2 contents in the range of 1–3% were deposited on soda lime glass (SLG) substrates at room temperature by pulsed laser deposition (PLD) and succeeded by annealing for 60 min at a temperature of 400°C. The dominant phase for these films shows a hexagonal crystal structure, which is the metastable phase of the doped CdO. Tauc’s relation is used for determining the energy band gap (Eg) regarding doped CdO thin films over the photon energy range of 300 nm to 800 nm. A rise in SnO2 concentrations is accompanied by a reduction in optical transmittance. The Hall effect measurement demonstrates the n-type conductivity of our produced films. When the SnO2 content is of ≅ 0.01 and the operating temperature is of 300°C, the maximum attainable sensitivity of CdO:SnO2 mixed films toward nitrogen dioxide (NO2) gas is achieved in terms of sensing characteristics. The outcomes demonstrate that, with a recovery time of 60 seconds and a response time of 25 seconds, the maximum sensitivity is equivalent to 78.05%. From room temperature to 300°C, the resistance to NO2 gas is reduced linearly with operating temperature.

KEY WORDS: transparent metal oxide, nanothin film, pulse laser deposition, CdO, SnO2, gas-sensing application

DOI: https://doi.org/10.15407/nnn.24.01.0211

Citation:
Huda Saadi Ali and Zuheer N. Majeed, Synthesis and Characterization of Nano-CdO:SnO2 Thin Film for Gas-Sensing Applications, Nanosistemi, Nanomateriali, Nanotehnologii, 24, No. 1: 211–224 (2026); https://doi.org/10.15407/nnn.24.01.0211
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