Highly sensitive hydrogen sensors based on SnO2 nanomaterials with different morphologies

Shen, Yanbai; Wang, Wei; Fan, Anfeng; Wei, Dezhou; Wang, Xinyang; Han, Cong; Shen, Yansong; Meng, Dan; San, Xiaoguang

doi:10.1016/j.ijhydene.2015.09.077

Cited by 82 publications

(21 citation statements)

References 32 publications

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“…Shen et al reported that the influence of the different morphology of SnO 2 nanomaterials on hydrogen sensing properties. They obtained the response of about 2.1 to 1000 ppm hydrogen at 250 °C for nanofilms [ 27 ]. Yeow et al reported the gas sensors based on SnO 2 nanospheres with various degrees porosity.…”

Section: Resultsmentioning

confidence: 99%

Highly Sensitive and Selective Hydrogen Gas Sensor Using the Mesoporous SnO2 Modified Layers

Xue

Zhang

et al. 2017

Sensors

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It is important to improve the sensitivities and selectivities of metal oxide semiconductor (MOS) gas sensors when they are used to monitor the state of hydrogen in aerospace industry and electronic field. In this paper, the ordered mesoporous SnO2 (m-SnO2) powders were prepared by sol-gel method, and the morphology and structure were characterized by X-ray diffraction analysis (XRD), transmission electron microscope (TEM) and Brunauer–Emmett–Teller (BET). The gas sensors were fabricated using m-SnO2 as the modified layers on the surface of commercial SnO2 (c-SnO2) by screen printing technology, and tested for gas sensing towards ethanol, benzene and hydrogen with operating temperatures ranging from 200 °C to 400 °C. Higher sensitivity was achieved by using the modified m-SnO2 layers on the c-SnO2 gas sensor, and it was found that the S(c/m2) sensor exhibited the highest response (Ra/Rg = 22.2) to 1000 ppm hydrogen at 400 °C. In this paper, the mechanism of the sensitivity and selectivity improvement of the gas sensors is also discussed.

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Section: Resultsmentioning

confidence: 99%

Highly Sensitive and Selective Hydrogen Gas Sensor Using the Mesoporous SnO2 Modified Layers

Xue

Zhang

et al. 2017

Sensors

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“…As is well known, many factors, such as grain size, microstructures, morphologies, and so on, all have a great influence on the gas-sensing performance of SnO 2 sensors [ 13 ]. Recently, SnO 2 , with various nanostructures and morphologies, including nanoparticles [ 14 ], nanosheets [ 1 ], nanowires [ 15 ], nanorods [ 16 ], nanofibers [ 10 ], nanospheres [ 17 ], and nanofilms [ 18 ], have been developed to investigate the effects of the structure and morphology on the gas-sensing performance. Among them, nanosheets have aroused people’s interest because of the large and continuous surface which provides a higher specific surface and contains an abundance of active sites which are a benefit to physical and chemical adsorption.…”

Section: Introductionmentioning

confidence: 99%

2D SnO2 Nanosheets: Synthesis, Characterization, Structures, and Excellent Sensing Performance to Ethylene Glycol

et al. 2018

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Two dimensional (2D)SnO2 nanosheets were synthesized by a substrate-free hydrothermal route using sodium stannate and sodium hydroxide in a mixed solvent of absolute ethanol and deionized water at a lower temperature of 130 °C. The characterization results of the morphology, microstructure, and surface properties of the as-prepared products demonstrated that SnO2 nanosheets with a tetragonal rutile structure, were composed of oriented SnO2 nanoparticles with a diameter of 6–12 nm. The X-ray diffraction (XRD) and high-resolution transmission electron microscope (FETEM) results demonstrated that the dominant exposed surface of the SnO2 nanoparticles was (101), but not (110). The growth and formation was supposed to follow the oriented attachment mechanism. The SnO2 nanosheets exhibited an excellent sensing response toward ethylene glycol at a lower optimal operating voltage of 3.4 V. The response to 400 ppm ethylene glycol reaches 395 at 3.4 V. Even under the low concentration of 5, 10, and 20 ppm, the sensor exhibited a high response of 6.9, 7.8, and 12.0 to ethylene glycol, respectively. The response of the SnO2 nanosheets exhibited a linear dependence on the ethylene glycol concentration from 5 to 1000 ppm. The excellent sensing performance was attributed to the present SnO2 nanoparticles with small size close to the Debye length, the larger specific surface, the high-energy exposed facets of the (101) surface, and the synergistic effects of the SnO2 nanoparticles of the nanosheets.

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“…As we know, the sensing signal of MOS based gas sensors is generated mainly by the adsorption, desorption, and reaction of oxygen and target gases on the surface of the sensing materials [24]. Thus the sensing performance of these sensors is closely related to the microstructure, morphology, crystal size, chemical composition, and synthesis process of the sensing materials [25,26]. On this account, the controllable synthesis of novel types gas sensing materials with different architectures and morphologies have always been the research hotspot in this field.…”

Section: Introductionmentioning

confidence: 99%

Controllable Synthesis of Zn-Doped α-Fe2O3 Nanowires for H2S Sensing

et al. 2019

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One-dimensional Zn-doped α-Fe2O3 nanowires have been controllably synthesized by using the pure pyrite as the source of Fe element through a two-step synthesis route, including the preparation of Fe source solution by a leaching process and the thermal conversion of the precursor solution into α-Fe2O3 nanowires by the hydrothermal and calcination process. The microstructure, morphology, and surface composition of the obtained products were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy. It was found that the formation process of α-Fe2O3 is significantly influenced by the introduction of Zn2+. The gas sensing measurements indicated that the sensor based on 1% Zn-doped α-Fe2O3 nanowires showed excellent H2S sensing properties at the optimum operating temperature of 175 °C. Notably, the sensor showed a low H2S detection limit of 50 ppb with a sensor response of 1.5. Such high-performance sensing would be ascribed to the one-dimensional structure and high specific surface area of the prepared 1% Zn-doped α-Fe2O3 nanowires, which can not only provide a large number of surface active sites for the adsorption and reaction of the oxygen and H2S molecules, but also facilitate the diffusion of the gas molecules towards the entire sensing materials.

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Highly sensitive hydrogen sensors based on SnO2 nanomaterials with different morphologies

Cited by 82 publications

References 32 publications

Highly Sensitive and Selective Hydrogen Gas Sensor Using the Mesoporous SnO2 Modified Layers

Highly Sensitive and Selective Hydrogen Gas Sensor Using the Mesoporous SnO2 Modified Layers

2D SnO2 Nanosheets: Synthesis, Characterization, Structures, and Excellent Sensing Performance to Ethylene Glycol

Controllable Synthesis of Zn-Doped α-Fe2O3 Nanowires for H2S Sensing

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