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<p>In this paper, the Volatile Organic Compounds (VOCs) such as acetone (CH<sub>3</sub>COCH<sub>3</sub>) and ammonia (NH<sub>3</sub>) sensing properties of amorphous TiO<sub>2</sub> thin films and quantum dots (QDs) based sensors are reported. The FESEM images confirm the formation of some regular shaped particles at lower growth temperature. The grain size of these particles decreases after the annealing treatment. At room temperature (RT), the grain size changes from 94 to 65&#xa0;nm. At a higher growth temperature of 300&#xa0;℃, the grain size of the particles changes from 154 to 87&#xa0;nm with post-deposition annealing temperature. A hybrid top-down approach: surfactant-free sonication-induced chemical etching technique has been used to synthesize the QDs of TiO<sub>2</sub> from the optimized thin film samples. The HRTEM images confirmed the formation of TiO<sub>2</sub> QDs with a size of ~ 6&#xa0;nm. The present study confirms that the QD-based sensor gives a higher sensing response compared to its respective thin-film-based sensor. The selectivity of the TiO<sub>2</sub> QDs between acetone and ammonia vapour showed promising results.</p>

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Enhancement of sensing response and selectivity between VOC and ammonia vapour by transforming amorphous TiO2 thin films to quantum dots

  • 期刊论文

  • 发表日期：

    2026年7月4日

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  • Protiksha Dutta,
  • Abu Talat Tahir Mostako,
  • Prasanta Kumar Saikia

摘要

In this paper, the Volatile Organic Compounds (VOCs) such as acetone (CH3COCH3) and ammonia (NH3) sensing properties of amorphous TiO2 thin films and quantum dots (QDs) based sensors are reported. The FESEM images confirm the formation of some regular shaped particles at lower growth temperature. The grain size of these particles decreases after the annealing treatment. At room temperature (RT), the grain size changes from 94 to 65 nm. At a higher growth temperature of 300 ℃, the grain size of the particles changes from 154 to 87 nm with post-deposition annealing temperature. A hybrid top-down approach: surfactant-free sonication-induced chemical etching technique has been used to synthesize the QDs of TiO2 from the optimized thin film samples. The HRTEM images confirmed the formation of TiO2 QDs with a size of ~ 6 nm. The present study confirms that the QD-based sensor gives a higher sensing response compared to its respective thin-film-based sensor. The selectivity of the TiO2 QDs between acetone and ammonia vapour showed promising results.