H2S gas sensing properties of Fe2O3 nanoparticle-decorated NiO nanoplate sensors

Free-standing TiNT array film was successfully synthesized by a one-step anodization method. The characteristic techniques including scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD) were adopted to characterize the morphology and chemical composition of the TiNT array film. Subsequently, gas sensor based on the TiNT array film was fabricated and its sensing performance toward H 2 S was investigated. The results showed that the optimum operating temperature to detect H 2 S gas was 300℃, the detection range to H 2 S gas was 1-50 ppm with the response value of 4.5-26.2, and a *Manuscript Click here to view linked References good linearity of sensing characteristics could be observed. Meanwhile, the response and recovery time of the sensor to 50 ppm H 2 S gas were as low as 22 s and 6 s, respectively. In addition, mechanisms of the development of the free-standing TiNT array film and the sensor towards H 2 S were discussed. In conclusion, its outstanding sensing properties and readily fabrication of the TiNT array film sensor presented the potential industrial applications.

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“…The changing process of oxygen molecules on the nanotube surface is illustrated in Eqs. (1)(2)(3)(4) [38,39]:…”

Section: Gas Sensing Mechanismmentioning

confidence: 99%

“…Hydrogen sulfide (H 2 S) is one of the main pollutants produced in various industrial processes. It is colorless, highly toxic, extremely flammable and corrosive in nature [1,2]. Humans exposed to H 2 S at low concentrations suffer eye irritation, olfactory fatigue, and damage to the lungs and nervous system.…”

Section: Introductionmentioning

confidence: 99%

A fast response and recovery H2S gas sensor based on free-standing TiO2 nanotube array films prepared by one-step anodization method

Tong

Shen

Chen

et al. 2017

Ceramics International

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“…The development of composites in constructing the heterostructures is useful in many applications, including gas sensors. For instance, Sun et al synthesized Fe2O3-NiO heterostructure using a facile solvothermal process for the H2S gas sensor [12]. Dong et al prepared Fe2O3/NiO composites using the electrospinning and solution-phase reaction for ethanol gas sensing [13].…”

Section: Introductionmentioning

confidence: 99%

PHYSICAL PROPERTIES OF NOVEL α-Fe2O3/NiO HETEROSTRUCTURES THROUGH IMMERSION/ SOL–GEL SPIN COATING METHOD: DIFFERENT DEPOSITION NUMBERS OF NiO LAYER

et al. 2021

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The novel hematite (α-Fe2O3)/nickel oxide (NiO) heterostructures were grown on fluorine-doped tin oxide (FTO) coated glass substrates at various deposited NiO of 3, 5, and 7 layers. The heterostructures were successfully synthesized using the immersion and sol–gel spin coating methods for α-Fe2O3 and NiO films, respectively. The field emission scanning electron microscopy analysis showed that each sample of α-Fe2O3/NiO heterostructures has a unique surface morphology when deposited with different NiO layers. The X-ray diffraction pattern shows that the number of NiO layers affected the diffraction peaks. The NiO diffraction peak intensity at (111) plane increased when the deposition number of NiO layer was increased. The crystallite sizes of NiO were 35.4, 33.6, and 38.0 nm for 3-, 5-, and 7-layer NiO, respectively. The interplanar spacing, lattice parameter, and unit cell volume indicate NiO with 3-layer as the highest, while 5- and 7-layer had the same values. Meanwhile, the strain and stress values show the compressive strain and tensile stress, respectively. The optical properties reveal that the highest transmittance and the lowest absorbance percentages were recorded for a 3-layer NiO sample. In contrast, the lowest transmittance and the highest absorbance percentages were obtained for the sample with 5-layer NiO. Different thicknesses and morphologies of heterostructures explained these situations. In addition, each unique heterostructure of α-Fe2O3/NiO with high visible light absorption nature is perceived to reduce the bandgap energy and has the potential to be used in sensor and solar cell applications.

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“…The exposure to H 2 S gas is often considered a high risk threatening the health of employees in the industrial sector. Also, H 2 S is extensively used in chemical laboratory, being is colorless, tasteless, and odorless, as well as it is very difficult to be detected [5]. Exposure to high H 2 S concentrations (100 ppm) leads to an immediate collapse with loss of breathing and high probability of death [6].…”

Section: Introductionmentioning

confidence: 99%

A Highly Selective and Sensitive H2S Gas Sensor Based on Novel Nanostructure Core–Shell FeCr2O4@ZnO@MgO

Borhade

Bobade

Tope

et al. 2021

J Inorg Organomet Polym

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Gas detection is significant for controlling industrial and vehicle emission, house equipment security and environmental monitoring. Various devices are developed and designed for detection of CO 2 , CO, SO 2 , O 2 , O 3 , H 2 , NH 3 , and several other organic gases. The fabrication of FeCr 2 O 4 , FeCr 2 O 4 @ZnO, and FeCr 2 O 4 @ZnO@MgO core-shell nanostructure by sol-gel method and their gas sensing performance using thick films were reported here for the first time. The characterization was completed by means of X-ray diffraction (XRD), Infrared spectroscopy (FT-IR), Scanning electron microscopy (SEM), Energy dispersive X-ray (EDX), and Transmission electron microscopy (TEM) used for confirmation of crystal structure and their morphology. The synthesized oxides were formulated to identify various air pollutants including CO, CO 2 , Cl 2 , NH 3 , H 2 , and H 2 S. The influences of thermal annealing (300-500 °C) on the crystallization and H 2 S gas sensing performance were investigated. Among the three oxides studied, 355.08 is the sensitivity for FeCr 2 O 4 , 461.12 for FeCr 2 O 4 @ZnO and highest sensitivity was observed for FeCr 2 O 4 @ZnO@MgO core-shell sensor for H 2 S gas (500 ppm) is 597.17. The sensitivity of the measurements to relative humidity as an interfering parameter was also investigated.

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H2S gas sensing properties of Fe2O3 nanoparticle-decorated NiO nanoplate sensors

Cited by 59 publications

References 31 publications

A fast response and recovery H2S gas sensor based on free-standing TiO2 nanotube array films prepared by one-step anodization method

A fast response and recovery H2S gas sensor based on free-standing TiO2 nanotube array films prepared by one-step anodization method

PHYSICAL PROPERTIES OF NOVEL α-Fe2O3/NiO HETEROSTRUCTURES THROUGH IMMERSION/ SOL–GEL SPIN COATING METHOD: DIFFERENT DEPOSITION NUMBERS OF NiO LAYER

A Highly Selective and Sensitive H2S Gas Sensor Based on Novel Nanostructure Core–Shell FeCr2O4@ZnO@MgO

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