TiO2 as a gas sensor: The novel carbon structures and noble metals as new elements for enhancing sensitivity – A review

Simonetti, Evelyn Alves Nunes; Oliveira, Thais Cardoso de; Machado, Ádamo Enrico do Carmo; Silva, Amanda Alvarenga Coutinho; Santos, Alan Silva dos; Cividanes, Luciana De Simone

doi:10.1016/j.ceramint.2021.03.189

Cited by 59 publications

(19 citation statements)

References 128 publications

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“…There are several factors that could be associated with the enhanced performance of the TiO 2 /rGO composite. It is reported that the addition of 2D GO could increase the specific surface area of a composite [ 31 , 57 , 58 ]. Graphene itself tends to be hydrophobic in nature, with its wetting characteristic being similar to that of graphite [ 59 ].…”

Section: Resultsmentioning

confidence: 99%

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Evaluating Different TiO2 Nanoflower-Based Composites for Humidity Detection

Musa

Mamat

Malek

et al. 2022

Sensors

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Unique three-dimensional (3D) titanium dioxide (TiO2) nanoflowers (TFNA) have shown great potential for humidity sensing applications, due to their large surface area-to-volume ratio and high hydrophilicity. The formation of a composite with other materials could further enhance the performance of this material. In this work, the effect of different types of composites on the performance of a TNFA-based humidity sensor was examined. NiO, ZnO, rGO, and PVDF have been explored as possible composite pairing candidates with TiO2 nanoflowers, which were prepared via a modified solution immersion method. The properties of the composites were examined using field emission electron spectroscopy (FESEM), X-ray diffractometry (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), current-voltage (I-V) analysis, Hall effect measurement, and contact angle measurement. The performance of the humidity sensor was assessed using a humidity sensor measurement system inside a humidity-controlled chamber. Based on the result, the combination of TiO2 with rGO produced the highest sensor response at 39,590%. The achievement is attributed to the increase in the electrical conductivity, hydrophilicity, and specific surface area of the composite.

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Section: Resultsmentioning

confidence: 99%

“…However, when coupled with rGO, the overall resistance of the composite is reduced greatly, as reported by researchers [ 40 ]. RGO could serve as an efficient electron channel because of its high electron mobility [ 58 ].…”

Section: Resultsmentioning

confidence: 99%

Evaluating Different TiO2 Nanoflower-Based Composites for Humidity Detection

Musa

Mamat

Malek

et al. 2022

Sensors

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“…To this end, the usefulness of a variety of potential designs, including titania nanotube arrays loaded with antibiotics (Figure 10), has been recently discussed as a potential strategy to address localized infections [223]. For all these sensing applications, the inclusion of carbon nanostructures can be beneficial to enhance sensitivity and the performance of the devices generally, as recently reviewed [10]. This is true for a variety of carbon nanomorphologies.…”

Section: Sensingmentioning

confidence: 99%

“…These approaches have indeed allowed the practical widespread use of TiO2-for instance, for biomass conversion processes [8]-thanks to the improved hydrothermal stability of the catalyst [9]. In particular, the combination of titania with noble metals and carbon nanostructures has allowed the development of high-performing gas sensors [10] and photocatalysts [11]. Dye-sensitizers combined with titania allow metal-free photocatalysts to be attained for hydrogen production using visible light [12].…”

Section: Introduction 1titania Properties and Usesmentioning

confidence: 99%

Carbon Nanostructures Decorated with Titania: Morphological Control and Applications

et al. 2021

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Nanostructured titania (TiO2) is the most widely applied semiconducting oxide for a variety of purposes, and it is found in many commercial products. The vast majority of uses rely on its photo-activity, which, upon light irradiation, results in excited states that can be used for diverse applications. These range from catalysis, especially for energy or environmental remediation, to medicine—in particular, to attain antimicrobial surfaces and coatings for titanium implants. Clearly, the properties of titania are enhanced when working at the nanoscale, thanks to the increasingly active surface area. Nanomorphology plays a key role in the determination of the materials’ final properties. In particular, the nucleation and growth of nanosized titania onto carbon nanostructures as a support is a hot topic of investigation, as the nanocarbons not only provide structural stability but also display the ability of electronic communication with the titania, leading to enhanced photoelectronic properties of the final materials. In this concise review, we present the latest progress pertinent to the use of nanocarbons as templates to tailor nanostructured titania, and we briefly review the most promising applications and future trends of this field.

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“…Applications of TiO 2 -based photocatalytic systems: water and/or air remediation [7][8][9], gas sensors [10][11][12][13], generation of solar fuels and energy applications [14][15][16][17], degradation of dyes and/or pharmaceuticals [18][19][20].…”

mentioning

confidence: 99%