Acetone Gas Sensing Properties of a Multiple-Networked Fe2O3-Functionalized CuO Nanorod Sensor

Fe2O3-decorated CuO nanorods were prepared by Cu thermal oxidation followed by Fe2O3decoration via a solvothermal route. The acetone gas sensing properties of multiple-networked pristine and Fe2O3-decorated CuO nanorod sensors were examined. The optimal operating temperature of the sensors was found to be 240°C. The pristine and Fe2O3-decorated CuO nanorod sensors showed responses of 586 and 1,090%, respectively, to 1,000 ppm of acetone at 240°C. The Fe2O3-decorated CuO nanorod sensor also showed faster response and recovery than the latter sensor. The acetone gas sensing mechanism of the Fe2O3-decorated CuO nanorod sensor is discussed in detail. The origin of the enhanced sensing performance of the multiple-networked Fe2O3-decorated CuO nanorod sensor to acetone gas was explained by modulation of the potential barrier at the Fe2O3-CuO interface, highly catalytic activity of Fe2O3for acetone oxidation, and the creation of active adsorption sites by Fe2O3nanoparticles.

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Nitrogen Monoxide Gas Sensing Properties of CuO Nanorods Synthesized by a Hydrothermal Method

Korean Journal of Materials Research ◽

10.3740/mrsk.2014.24.1.19 ◽

2014 ◽

Vol 24 (1) ◽

pp. 19-24 ◽

Cited By ~ 4

Author(s):

Soo-Jeong Park ◽

Hyojin Kim ◽

Dojin Kim

Keyword(s):

Hydrothermal Method ◽

Gas Sensing ◽

Nitrogen Monoxide ◽

Sensing Properties ◽

Gas Sensing Properties ◽

Cuo Nanorods

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Preparation and Property of Lanthanum Ferrite Formaldehyde Gas Sensor Modified by Carbon Nanotubes and Silver

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.320.554 ◽

2013 ◽

Vol 320 ◽

pp. 554-557 ◽

Cited By ~ 1

Author(s):

Yu Min Zhang ◽

Yu Tao Lin ◽

Jin Zhang ◽

Zhong Qi Zhu ◽

Qiang Liu ◽

...

Keyword(s):

Carbon Nanotubes ◽

Chemical Synthesis ◽

Recovery Time ◽

Gas Sensing ◽

Operating Temperature ◽

Sol Gel ◽

Lanthanum Ferrite ◽

Gas Sensing Properties ◽

Response And Recovery ◽

Sensitive Property

Our previous study revealed that the gas sensitive property of Silver-modified Lanthanum Ferrite (Ag-LaFeO3) is well, but the operating temperature is still high and the sensitivity also needs to be improved. This work based on our previous study. Ag-LaFeO3 was further modified by the Carbon nanoTubes (CNTs). The Ag-LaFeO3 powder modified with CNTs (CNTs-Ag-LaFeO3) was prepared by a sol-gel method combined with microwave chemical synthesis. The structure and gas-sensing properties were investigated. The results show that the structure of CNTs-Ag-LaFeO3 is of orthogonal perovskite. The sensitivity of 0.75% CNTs-Ag-LaFeO3 powder for 1 ppm formaldehyde is 13 at 86°C. The response and recovery time are 100s and 60s, respectively. Moreover, the sensor also has an obvious response for 1ppm formaldehyde at 58°C.

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TUNGSTEN-DOPED TiO2 NANOLAYERS WITH IMPROVED CO2 GAS SENSING PROPERTIES FOR ENVIRONMENTAL APPLICATIONS

Surface Review and Letters ◽

10.1142/s0218625x18500245 ◽

2017 ◽

Vol 24 (Supp02) ◽

pp. 1850024 ◽

Cited By ~ 1

Author(s):

MALIHEH SABERI ◽

ALI AKBAR ASHKARRAN

Keyword(s):

Electron Microscopy ◽

Gas Sensing ◽

Operating Temperature ◽

Sol Gel ◽

Optimum Operating ◽

Optimum Operating Temperature ◽

Sensing Properties ◽

Vis Spectroscopy ◽

Gas Sensing Properties ◽

Tungsten Concentration

Tungsten-doped TiO2 gas sensors were successfully synthesized using sol–gel process and spin coating technique. The fabricated sensor was characterized by field emission scanning electron microscopy (FE-SEM), ultraviolet visible (UV–Vis) spectroscopy, transmission electron microscopy (TEM), X-Ray diffraction (XRD) and Fourier transform infrared (FTIR) spectroscopy. Gas sensing properties of pristine and tungsten-doped TiO2 nanolayers (NLs) were probed by detection of CO2 gas. A series of experiments were conducted in order to find the optimum operating temperature of the prepared sensors and also the optimum value of tungsten concentration in TiO2 matrix. It was found that introducing tungsten into the TiO2 matrix enhanced the gas sensing performance. The maximum response was found to be (1.37) for 0.001[Formula: see text]g tungsten-doped TiO2 NLs at 200[Formula: see text]C as an optimum operating temperature.

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In situ growth of WO3 nanotube arrays and their H2S gas sensing properties for reduced operating temperature

Materials Letters ◽

10.1016/j.matlet.2020.127716 ◽

2020 ◽

Vol 271 ◽

pp. 127716

Author(s):

Xiaoguang San ◽

Yiming Lu ◽

Guosheng Wang ◽

Dan Meng ◽

Xiaohui Gong ◽

...

Keyword(s):

Gas Sensing ◽

Operating Temperature ◽

Nanotube Arrays ◽

In Situ Growth ◽

Sensing Properties ◽

Gas Sensing Properties

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MOFs-Derived Porous NiFe2O4 Nano-Octahedrons with Hollow Interiors for an Excellent Toluene Gas Sensor

Nanomaterials ◽

10.3390/nano9081059 ◽

2019 ◽

Vol 9 (8) ◽

pp. 1059 ◽

Cited By ~ 4

Author(s):

Yanlin Zhang ◽

Chaowei Jia ◽

Qiuyue Wang ◽

Quan Kong ◽

Gang Chen ◽

...

Keyword(s):

Gas Sensing ◽

Metal Organic Framework ◽

Fast Response ◽

Sensing Properties ◽

Gas Sensing Properties ◽

Metal Organic ◽

Response And Recovery ◽

Nife2o4 Nanoparticles ◽

Gas Molecules ◽

Ppm Level

Toluene is extensively used in many industrial products, which needs to be effectively detected by sensitive gas sensors even at low-ppm-level concentrations. Here, NiFe2O4 nano-octahedrons were calcinated from NiFe-bimetallic metal-organic framework (MOFs) octahedrons synthesized by a facile refluxing method. The co-existence of p-Phthalic acid (PTA) and 3,3-diaminobenzidine (DAB) promotes the formation of smooth NiFe-bimetallic MOFs octahedrons. After subsequent thermal treatment, a big weight loss (about 85%) transformed NiFe2O4 nanoparticles (30 nm) into NiFe2O4 porous nano-octahedrons with hollow interiors. The NiFe2O4 nano-octahedron based sensor exhibited excellent gas sensing properties for toluene with a nice stability, fast response, and recovery time (25 s/40 s to 100 ppm toluene), and a lower detection limitation (1 ppm) at 260 °C. The excellent toluene-sensing properties can not only be derived from the hollow interiors combined with porous nano-octahedrons to favor the diffusion of gas molecules, but also from the efficient catalytic activity of NiFe2O4 nanoparticles.

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A Formaldehyde Gas Sensor Based on Zinc Doped Lanthanum Ferrite

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.873.304 ◽

2013 ◽

Vol 873 ◽

pp. 304-310 ◽

Cited By ~ 1

Author(s):

Jin Zhang ◽

Yu Min Zhang ◽

Chang Yi Hu ◽

Zhong Qi Zhu ◽

Qing Ju Liu

Keyword(s):

Gas Sensing ◽

Sol Gel ◽

X Ray Diffraction ◽

Sensing Properties ◽

Transmission Electron ◽

Lanthanum Ferrite ◽

Gas Sensing Properties ◽

Recovery Times ◽

Response And Recovery ◽

Sensing Characteristics

The gas-sensing properties of zinc doped lanthanum ferrite (Zn-LaFeO3) compounds for formaldehyde were investigated in this paper. Zn-LaFeO3 powders were prepared using sol-gel method combined with microwave chemical synthesis. The powders were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM), respectively. The formaldehyde gas-sensing characteristics for the sample were examined. The experimental results indicate that the sensor based on the sample Zn-LaFeO3 shows excellent gas-sensing properties to formaldehyde gas. At the optimal operating temperature of 250°C, the sensitivity of the sensor based on LaFe0.7Zn0.3O3 to 100ppm formaldehyde is 38, while to other test gases, the sensitivity is all lower than 20. The response and recovery times for the sample to formaldehyde gas are 100s and 100s, respectively.

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Thermal, optical and gas sensing properties of ZnO films prepared by different techniques

The European Physical Journal Applied Physics ◽

10.1051/epjap/2017170270 ◽

2018 ◽

Vol 81 (1) ◽

pp. 10101 ◽

Cited By ~ 1

Author(s):

Sonik Bhatia ◽

Neha Verma ◽

Munish Aggarwal

Keyword(s):

Gas Sensor ◽

Recovery Time ◽

Gas Sensing ◽

Operating Temperature ◽

Sol Gel ◽

Hexagonal Wurtzite Structure ◽

Effect Of Temperature ◽

Zno Films ◽

Sensing Properties ◽

Response And Recovery

Nowadays, for environmental protection, the use of portable gas sensor is essential to detect toxic gases. To control this problem of hazardous gases, metal oxide based sensors plays a vital role. In this recent study, Indium (2 at.wt.%) doped ZnO films has been prepared by sol gel spin coating and thermal evaporation techniques on glass substrates. To enhance the sensing properties, indium (In) was used as dopant and their annealing effect of temperature was observed. Thermal properties have shown the fruitful result that prepared films are useful for the fabrication of solar cell. Electrical properties revealed that capacitance and dielectric constant decreases with increase in frequency. X-ray Diffraction showed hexagonal wurtzite structure highly oriented along (1 0 1) plane. Field emission scanning electron microscope of these synthesis films prepared by different have shown the morphology as nanospheres having size of the order of 40–60 nm. 2.0 at.% of indium as modifier resulted in highest response and selectivity towards 5 ppm of NO2 gas at different operating temperature (50–200 °C). Highest sensitivity was obtained at operating temperature of 150 °C. Prepared films have quick response and recovery time in the range of 14–27 s and 67–63 s. The highest response and recovery time of gas sensor was explained by valence ion mechanism.

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