Improving the humidity sensing below 30% RH of TiO2 with GO modification

Sun, Linchao; Haidry, Azhar Ali; Fatima, Qawareer; Li, Zhong; Yao, Zhengjun

doi:10.1016/j.materresbull.2017.11.001

Cited by 39 publications

(21 citation statements)

References 54 publications

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“…Figure 5 shows FTIR transmission spectra of the TiO 2 sample (a), the base fluid used to prepare the nanofluid (b), and a reference of TiO 2 with anatase phase (c) to compare with the nanoparticles formed. A broad band is observed between 1000–400 cm −1 , which is the typical zone for the stretching vibration of Ti–O bonds and bending vibration of Ti–O–Ti [ 28 , 29 ]. Also, a broad band can be seen around 3400 cm −1 , assigned to OH bonds [ 29 , 30 ].…”

Section: Resultsmentioning

confidence: 99%

A Solvothermal Synthesis of TiO2 Nanoparticles in a Non-Polar Medium to Prepare Highly Stable Nanofluids with Improved Thermal Properties

et al. 2018

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Nanofluids are systems with several interesting heat transfer applications, but it can be a challenge to obtain highly stable suspensions. One way to overcome this challenge is to create the appropriate conditions to disperse the nanomaterial in the fluid. However, when the heat transfer fluid used is a non-polar organic oil, there are complications due to the low polarity of this solvent. Therefore, this study introduces a method to synthesize TiO2 nanoparticles inside a non-polar fluid typically used in heat transfer applications. Nanoparticles produced were characterized for their structural and chemical properties using techniques such as X-ray Diffraction (XRD), Raman spectroscopy, Transmission Electron Microscopy (TEM), Fourier Transform Infrared (FTIR) spectroscopy, and X-ray photoelectron spectroscopy (XPS). The nanofluid showed a high stability, which was analyzed by means of UV-vis spectroscopy and by measuring its particle size and ζ potential. So, this nanofluid will have many possible applications. In this work, the use as heat transfer fluid was tested. In this sense, nanofluid also presented enhanced isobaric specific heat and thermal conductivity values with regard to the base fluid, which led to the heat transfer coefficient increasing by 14.4%. Thus, the nanofluid prepared could be a promising alternative to typical HTFs thanks to its improved thermal properties and high stability resulting from the synthesis procedure.

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Section: Resultsmentioning

confidence: 99%

A Solvothermal Synthesis of TiO2 Nanoparticles in a Non-Polar Medium to Prepare Highly Stable Nanofluids with Improved Thermal Properties

et al. 2018

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“…Eventually, the samples were put in acetone to remove photoresist. The detailed thermal oxidation process and the sensor fabrication technique have been reported in our previous studies elsewhere [22][23][24]. The schematic diagram of overall preparation steps is shown in Fig.…”

Section: Fabrication Of Gas Sensorsmentioning

confidence: 99%

Cost-effective fabrication of polycrystalline TiO2 with tunable n/p response for selective hydrogen monitoring

Haidry

Sun

Saruhan

et al. 2018

Sensors and Actuators B: Chemical

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In this report, we demonstrate a simple and cost-effective strategy to prepare polycrystalline rutile TiO2 based gas sensors with tunable n/p type conductivity inversion depending on gas concentration, operating temperature and applied voltage. The effect of surface modification by Ag and Ni thin film on structural, morphological and gas sensor characteristics is studied in detail. The sensors show excellent sensing performance in terms of sensitivity (~25% for 0.1 vol. % H2 diluted in technical air), selectivity (selectivity factor for 0.1 vol. % H2 is about ~24 against NH3, CH4, NO2 and ~8 for CO), stability (both long-term and short-term) and reaction times (~0.7 min for 0.1 vol. % H2). The aforementioned performance is recorded at 300 °C with applied voltage of 0.1 V. Excluding the power consumption of sensor heater-5 watt), this applied voltage 0.1 V can reduce the power-10 watt. We found a critical point, defined with threshold-concentration (CTh), threshold-temperature (TTh) and criticalvoltage (VC), at which the conductivity inverses from one kind to another, something intriguing to novel sensing phenomena that can be exploited to tailor the selectivity of the sensors. A physical-chemical sensing model is presented to understand the aforesaid peculiar occurrence.

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“…Note that the optimal temperature of SnO 2 nanofiber for sensing DOP (300 • C) and 2-EH (200 • C) was very different, thus the sensor temperature was set at 260 • C as a compromise in the following tests. Note also that other experimental conditions, such as electrode structure and dimension, may also affect the sensor performance (Langer et al, 2015;Haidry et al, 2016Haidry et al, , 2019Sun et al, 2018;Fatima et al, 2019), which deserves further investigation.…”

Section: Resultsmentioning

confidence: 99%

Detection of Semi-volatile Plasticizers as a Signature of Early Electrical Fire

Jia

Chen

et al. 2019

Front. Mater.

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Detection of characteristic species released from overheated PVC cables may enable early warning of electrical fire. This work identified the major volatile species for overheated PVC cables, and verified their potential as fire signatures with metal oxide gas sensors. Semi-volatile Dioctyl phthalate (DOP) and 2-Ethylhexanol (2-EH) were found to be ubiquitously present in the cable vapors as major species. Detection of these species and the vapors of overheated cables was accomplished with a metal oxide gas sensor. The response of the gas sensor to the cable vapors resulted mainly from DOP and 2-EH, demonstrating them as effective signature gases for overheated PVC cables. A gas sensor based on SnO 2 nanofibers was prepared with greatly enhanced response to the signature gases. Large-scale simulation tests showed that the nanofiber gas sensor could effectively detect the cable overheating at an early stage.

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Improving the humidity sensing below 30% RH of TiO2 with GO modification

Cited by 39 publications

References 54 publications

A Solvothermal Synthesis of TiO2 Nanoparticles in a Non-Polar Medium to Prepare Highly Stable Nanofluids with Improved Thermal Properties

A Solvothermal Synthesis of TiO2 Nanoparticles in a Non-Polar Medium to Prepare Highly Stable Nanofluids with Improved Thermal Properties

Cost-effective fabrication of polycrystalline TiO2 with tunable n/p response for selective hydrogen monitoring

Detection of Semi-volatile Plasticizers as a Signature of Early Electrical Fire

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