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<p>Powders for (TiO<sub>2</sub>)<sub>1−x</sub>(MoO<sub>3</sub>)<sub>x</sub> composites have been&#xa0;prepared with the use of&#xa0;a dry mix of TiO<sub>2</sub> and MoO<sub>3</sub> oxides with a variety of compositions (x = 0, 0.2, 0.4, 0.6, 0.8, and 1), then sintering at 1473&#xa0;K. The materials have been&#xa0;ground and formed into pellets so that they could be used as targets for the pulsed laser deposition (PLD)&#xa0;process, which produced thin films with a thickness of ≈150&#xa0;nm on a glass substrate. When MoO<sub>3</sub> is added to TiO<sub>2</sub>, the crystal size has been&#xa0;observed to decrease from 33.3 to 25.8&#xa0;nm, yet&#xa0;it after that&#xa0;continued to expand as MoO<sub>3</sub> was added.&#xa0;The molybdenum ions were confirmed by XRD patterns, indicating that the substitution regarding&#xa0;Mo<sup>+6</sup> ions for Ti<sup>+4</sup> ions in TiO<sub>2</sub> matrix is what is responsible for the changes in the oxide system’s optical properties. When MoO<sub>3</sub> amount in TiO<sub>2</sub> thin films increases from x = 0.2 to x = 0.6, the energy gap (Eg) opt drops by 3.1&#xa0;eV before increasing again. The optical constant was computed, and the wavelength was plotted. With regard to&#xa0;the composite, a gas sensitivity measurement was made. Samples of thin films were deposited on silicon substrates for (TiO<sub>2</sub>)<sub>1−X</sub>(MoO<sub>3</sub>)<sub>x</sub>/n-Si while oxidizing as well as&#xa0;reducing gases were present. Maximum sensitivity 77% and fast response time 4.5&#xa0;s have been acquired&#xa0;from (TiO<sub>2</sub>)<sub>0.6</sub>(MoO<sub>3</sub>)<sub>0.4</sub> composites thin films of gas sensors when exposed to H<sub>2</sub>S gas at a working temperature of 373&#xa0;K.</p>

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TiO2:MoO3 nanocomposite gas sensors prepared by pulsed laser deposition

  • 期刊论文

  • 发表日期：

    2025年2月4日

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  • Bushra A. Hasan,
  • Ahmad A. Hasan

摘要

Powders for (TiO2)1−x(MoO3)x composites have been prepared with the use of a dry mix of TiO2 and MoO3 oxides with a variety of compositions (x = 0, 0.2, 0.4, 0.6, 0.8, and 1), then sintering at 1473 K. The materials have been ground and formed into pellets so that they could be used as targets for the pulsed laser deposition (PLD) process, which produced thin films with a thickness of ≈150 nm on a glass substrate. When MoO3 is added to TiO2, the crystal size has been observed to decrease from 33.3 to 25.8 nm, yet it after that continued to expand as MoO3 was added. The molybdenum ions were confirmed by XRD patterns, indicating that the substitution regarding Mo+6 ions for Ti+4 ions in TiO2 matrix is what is responsible for the changes in the oxide system’s optical properties. When MoO3 amount in TiO2 thin films increases from x = 0.2 to x = 0.6, the energy gap (Eg) opt drops by 3.1 eV before increasing again. The optical constant was computed, and the wavelength was plotted. With regard to the composite, a gas sensitivity measurement was made. Samples of thin films were deposited on silicon substrates for (TiO2)1−X(MoO3)x/n-Si while oxidizing as well as reducing gases were present. Maximum sensitivity 77% and fast response time 4.5 s have been acquired from (TiO2)0.6(MoO3)0.4 composites thin films of gas sensors when exposed to H2S gas at a working temperature of 373 K.