Effect of calcination temperature on the humidity sensitivity of TiO2/graphene oxide nanocomposites

Luo, Liming; Yuan, Mingliang; Sun, Hongjuan; Peng, Tongjiang; Xie, Tangfeng; Chen, Qichao; Chen, Jungang

doi:10.1016/j.mssp.2018.09.019

Cited by 20 publications

(9 citation statements)

References 35 publications

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“…In a previous study, TiO 2 /graphene composite was synthesized simultaneously for gas sensor applications, and the electrical conductivities under heat treatment of the composites were measured after calcination between 300 and 480°C temperatures. The highest conductivity increase rate was observed in the sample, which was calinated at 400°C [39]. In our study, TiO 2 and graphene were synthesized separately after that mixed and annealed at 700°C, and higher conductivity level was reached for the same temperature values in the S 3 sample.…”

Section: Discussionmentioning

confidence: 50%

The effect of graphene nanoplatelets on technical properties of micro- and nano-sized TiO2 matrix: a comparative research study on electrical and optical characteristics

Güler

Ayhan

Başgöz

et al. 2020

J Mater Sci: Mater Electron

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In this study, titanium dioxide (TiO 2 )-based graphene nanoplatelets (GNPs)reinforced composite materials were produced and the electrical and optical properties of the composite materials were investigated. Graphene, which was used as a reinforcing material, was produced by using liquid-phase exfoliation method. While the TiO 2 used as matrix material was commercially available for the first group of samples, it was produced by using the sol-gel method for the second group of the samples. Different rates of graphene were added to the TiO 2 powders which were commercially available and produced by using sol-gel method. GNPs used as a reinforcing material were subjected to TEM analysis. The resulting composite materials were structurally examined in SEM and XRD. Then, the changes in electrical conductivity of these composites under the impact of temperature were measured. UV-Vis spectrometers of the samples were taken and their optical properties were determined. When temperaturebased electrical examination of the produced composite materials was performed, an increase was observed on the electrical conductivity values in both groups of samples as a result of addition of the reinforcing element. In addition, TiO 2 -containing composites produced by using sol-gel method had lower electrical conductivity comparing with commercially purchased TiO 2

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Section: Discussionmentioning

confidence: 50%

The effect of graphene nanoplatelets on technical properties of micro- and nano-sized TiO2 matrix: a comparative research study on electrical and optical characteristics

Güler

Ayhan

Başgöz

et al. 2020

J Mater Sci: Mater Electron

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“…This might be due to the deformation, grain refinement and straining induced by foreign materials [ 30 ]. In their work, Luo et al reported that the presence of rGO could suppress the grain growth of TiO 2 , consequently increasing the oxygen vacancy defect at the surface [ 31 ].…”

Section: Resultsmentioning

confidence: 99%

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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“…Calcination means heating a solid chemical compound to high temperatures in the absence or limited supply of air or oxygen to remove volatile substances or impurities and/or to incur thermal decomposition. 117 Shimazaki et al 74 fabricated a branched alumina nanofiber filler by the calcination of an alumina precursor, aluminum isopropoxide, adsorbed onto a paper filter (Figure 10).…”

Section: Smentioning

confidence: 99%

Section: Generating Of the Branched Nanofibersmentioning

confidence: 99%

A comprehensive review on branched nanofibers: Preparations, strategies, and applications

Zaarour

Alhinnawi

2022

Journal of Industrial Textiles

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Engineering surface morphologies of nanofibers has been attracting significant consideration in numerous fields and applications. Among different methods of generating nanofibers, electrospinning is the most widely adopted technique owing to the ease of forming nanofibers with an extensive range of properties and its exceptional advantages, such as the variety of shapes and sizes, as well as the adaptable porosity of nanofiber webs. The branched structure is considered one of the most attractive structures for scientific researchers due to its outstanding properties (e.g., high-specific surface area and extremely tiny diameters of branched nanofibers). Therefore, this work is the first one that summarizes the strategies and methods, reported so far, of producing branched nanofibers of different materials. The material types, formation mechanisms, characterizations, and applications of the branched nanofibers generated through different techniques will be discussed in detail in this study. We believe this work can be served as an important reference for the preparations, strategies, and applications of the branched nanofibers.

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Effect of calcination temperature on the humidity sensitivity of TiO2/graphene oxide nanocomposites

Cited by 20 publications

References 35 publications

The effect of graphene nanoplatelets on technical properties of micro- and nano-sized TiO2 matrix: a comparative research study on electrical and optical characteristics

The effect of graphene nanoplatelets on technical properties of micro- and nano-sized TiO2 matrix: a comparative research study on electrical and optical characteristics

Evaluating Different TiO2 Nanoflower-Based Composites for Humidity Detection

A comprehensive review on branched nanofibers: Preparations, strategies, and applications

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