Use of nanostructured and modified TiO2 as a gas sensing agent

Alves, Rosana Cardoso; Alves, Hugo P.A.; Cartaxo, J. M.; Rodrigues, Alisson Mendes; Neves, G. A.; Menezes, Romualdo Rodrigues

doi:10.1590/0366-69132021673833128

Cited by 5 publications

(3 citation statements)

References 106 publications

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“…The Figure (3) showed the existence of hydroxyl groups in nanocomposite. There are peaks between (3566.14 -3292.26 cm -1 ) are attributed to the stretching vibrations of the (O-H) group which is referred to the significant amount of the H2O molecules in the interlayer space and surface, and the reaction between the (O-H) groups of TiO2 / GO, another peak at 1604 cm -1 is ascribed to the (H-O-H) bending mode [13,14].…”

Section: Tio2/ Go Nanocompositementioning

confidence: 99%

“…In recent years, the development of new synthesis methods has allowed for the production of nanoparticles with precise control over size, shape, and composition, enabling their use in gas sensing applications. Moreover, the integration of nanoparticles with other materials, such as polymers and graphene, has further expanded the range of gas-sensing applications [3]. Nanoparticles-based gas sensors have been developed for detecting a wide range of gases, including carbon monoxide, nitrogen oxides, methane, and hydrogen.…”

Section: Introductionmentioning

confidence: 99%

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Improving the Performance of Titanium Oxide Nanocomposites as NO2 Gas Sensors for Optimum Sensitivity

Nemea,

Al-Abdaly

2024

Iraqi Journal of Science

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In this study, we investigate the performance improvement of titanium oxide (TiO2) nanocomposites as NO2 gas sensors for optimum sensitivity. The TiO2 nanocomposites were synthesized using a solvothermal method and were modified with different dopants and additives to enhance their sensing properties. The sensing performance of the TiO2 nanocomposites was evaluated in terms of sensitivity, selectivity, response time, and recovery time. The synthesized nanocomposites were successfully characterized using AFM, FTIR, SEM-EDX and XRD techniques. The results showed that the addition of additives such as TiO2/GO, TiO2-Ag/GO and TiO2- Al2O3/GO: TiO2/GO significantly improved the sensing properties of the TiO2 nanocomposites. The Ag-doped TiO2 nanocomposites exhibited the highest sensitivity towards NO2 gas with a very low detection limit. The Al2O3-doped TiO2 nanocomposites showed good selectivity towards NO2 gas compared to other interfering gases and has led to increase in the surface area. In conclusion, the addition of additives and the optimization of the annealing temperature can significantly improve the sensing properties of TiO2 nanocomposites towards NO2 gas. The findings of this study can contribute to the development of highly sensitive and selective NO2 gas sensors for various applications such as environmental monitoring and industrial safety.

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Section: Tio2/ Go Nanocompositementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Improving the Performance of Titanium Oxide Nanocomposites as NO2 Gas Sensors for Optimum Sensitivity

Nemea,

Al-Abdaly

2024

Iraqi Journal of Science

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“…The band-gap within titanium dioxide originates from the arrangement of electrons in both Ti and O atoms. Across all three polymorphs of titanium dioxide, the valence band (VB) mainly comprises O 2p orbitals, while the conduction band (CB) primarily consists of Ti 3d orbitals [47,48]. The most increased point of the VB resides at the Γ point within the Brillouin zone, while the lowest point of the CB sits at the X point.…”

Section: Energy Band-gap (E G )mentioning

confidence: 99%

Photocatalytic TiO2-Based Nanostructures as a Promising Material for Diverse Environmental Applications: A Review

Gatou,

Syrrakou,

Lagopati

et al. 2024

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Contemporary technological and industrial advancements have led to increased reliance on chemicals for product innovation, leading to heightened contamination of water sources by traditional pollutants (organic dyes, heavy metals) and disease-causing microorganisms. Wastewater treatment processes now reveal “emerging pollutants”, including pharmaceuticals, endocrine disruptors, and agricultural chemicals. While some are benign, certain emerging pollutants can harm diverse organisms. Researchers seek cost-effective water purification methods that completely degrade pollutants without generating harmful by-products. Semiconductor-based photocatalytic degradation, particularly using titanium dioxide (TiO2), is popular for addressing water pollution. This study focuses on recent applications of TiO2 nanostructures in photocatalysis for eliminating various water pollutants. Structural modifications, like doping and nanocomposite formation, enhance photocatalyst performance. The study emphasizes photocatalytic elimination mechanisms and comprehensively discusses factors impacting both the mechanism and performance of nano-TiO2-based photocatalysts. Characteristics of TiO2, such as crystal structure and energy band-gap, along with its photocatalytic activity mechanism, are presented. The review covers the advantages and limitations of different TiO2 nanostructure production approaches and addresses potential toxicity to human health and the environment. In summary, this review provides a holistic perspective on applying nano-TiO2 materials to mitigate water pollution.

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