Dataset Information

Exploring Sn_xTi_1-xO₂ Solid Solutions Grown onto Graphene Oxide (GO) as Selective Toluene Gas Sensors.

ABSTRACT: The major drawback of oxide-based sensors is the lack of selectivity. In this context, Sn_xTi_1-xO₂/graphene oxide (GO)-based materials were synthesized via a simple hydrothermal route, varying the titanium content in the tin dioxide matrix. Then, toluene and acetone gas sensing performances of the as-prepared sensors were systematically investigated. Specifically, by using 32:1 SnO₂/GO and 32:1 TiO₂/GO, a greater selectivity towards acetone analyte, also at room temperature, was obtained even at ppb level. However, solid solutions possessing a higher content of tin relative to titanium (as 32:1 Sn_0.55Ti_0.45O₂/GO) exhibited higher selectivity towards bigger and non-polar molecules (such as toluene) at 350 °C, rather than acetone. A deep experimental investigation of structural (XRPD and Raman), morphological (SEM, TEM, BET surface area and pores volume) and surface (XPS analyses) properties allowed us to give a feasible explanation of the different selectivity. Moreover, by exploiting the UV light, the lowest operating temperature to obtain a significant and reliable signal was 250 °C, keeping the greater selectivity to the toluene analyte. Hence, the feasibility of tuning the chemical selectivity by engineering the relative amount of SnO₂ and TiO₂ is a promising feature that may guide the future development of miniaturized chemoresistors.

SUBMITTER: Pargoletti E

PROVIDER: S-EPMC7221561 | biostudies-literature | 2020 Apr

REPOSITORIES: biostudies-literature

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Publications

Exploring SnxTi1-xO2 Solid Solutions Grown onto Graphene Oxide (GO) as Selective Toluene Gas Sensors.

Pargoletti Eleonora E Verga Simone S Chiarello Gian Luca GL Longhi Mariangela M Cerrato Giuseppina G Giordana Alessia A Cappelletti Giuseppe G

Nanomaterials (Basel, Switzerland) 20200415 4

The major drawback of oxide-based sensors is the lack of selectivity. In this context, SnxTi1-xO2/graphene oxide (GO)-based materials were synthesized via a simple hydrothermal route, varying the titanium content in the tin dioxide matrix. Then, toluene and acetone gas sensing performances of the as-prepared sensors were systematically investigated. Specifically, by using 32:1 SnO2/GO and 32:1 TiO2/GO, a greater selectivity towards acetone a ...[more]

PMID: 32326649

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Project description:This review critically examines the progress and challenges in the field of nanostructured tungsten oxide (WO3) gas sensors. It delves into the significant advancements achieved through nanostructuring and composite formation of WO3, which have markedly improved sensor sensitivity for gases like NO2, NH3, and VOCs, achieving detection limits in the ppb range. The review systematically explores various innovative approaches, such as doping WO3 with transition metals, creating heterojunctions with materials like CuO and graphene, and employing machine learning models to optimize sensor configurations. The challenges facing WO3 sensors are also thoroughly examined. Key issues include cross-sensitivity to different gases, particularly at higher temperatures, and long-term stability affected by factors like grain growth and volatility of dopants. The review assesses potential solutions to these challenges, including statistical analysis of sensor arrays, surface functionalization, and the use of novel nanostructures for enhanced performance and selectivity. In addition, the review discusses the impact of ambient humidity on sensor performance and the current strategies to mitigate it, such as composite materials with humidity shielding effects and surface functionalization with hydrophobic groups. The need for high operating temperatures, leading to higher power consumption, is also addressed, along with possible solutions like the use of advanced materials and new transduction principles to lower temperature requirements. The review concludes by highlighting the necessity for a multidisciplinary approach in future research. This approach should combine materials synthesis, device engineering, and data science to develop the next generation of WO3 sensors with enhanced sensitivity, ultrafast response rates, and improved portability. The integration of machine learning and IoT connectivity is posited as a key driver for new applications in areas like personal exposure monitoring, wearable diagnostics, and smart city networks, underlining WO3's potential as a robust gas sensing material in future technological advancements.

Dataset Information

Exploring Sn_xTi_1-xO₂ Solid Solutions Grown onto Graphene Oxide (GO) as Selective Toluene Gas Sensors.

Publications

Exploring Sn<sub>x</sub>Ti<sub>1-x</sub>O<sub>2</sub> Solid Solutions Grown onto Graphene Oxide (GO) as Selective Toluene Gas Sensors.

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