Flower-like hierarchical structures consisting of porous single-crystalline ZnO nanosheets and their gas sensing properties to volatile organic compounds (VOCs)

Meng, Fanli; Hou, Nannan; Ge, Shenguang; Sun, Bai; Jin, Zhen; Shen, Wei; Kong, Lingtao; Guo, Zheng; Sun, Yong; Wu, Hao; Wang, Chen; Li, Minqiang

doi:10.1016/j.jallcom.2014.11.175

Cited by 106 publications

(48 citation statements)

References 41 publications

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“…57,58,59 The Knudsen diffusion and molecular gas diffusion processes are described for the smaller (2100 nm) and larger (above 100 nm) pore diameter of sensing material. 57,58,59 The Knudsen diffusion and molecular gas diffusion processes are described for the smaller (2100 nm) and larger (above 100 nm) pore diameter of sensing material.…”

Section: Sensing Mechanismmentioning

confidence: 99%

Hierarchical nanostructured WO₃–SnO₂for selective sensing of volatile organic compounds

et al. 2015

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It remains a challenge to find a suitable gas sensing material that shows a high response and shows selectivity towards various gases simultaneously. Here, we report a mixed metal oxide WO3-SnO2 nanostructured material synthesized in situ by a simple, single-step, one-pot hydrothermal method at 200 °C in 12 h, and demonstrate its superior sensing behavior towards volatile organic compounds (VOCs) such as ammonia, ethanol and acetone. SnO2 nanoparticles with controlled size and density were uniformly grown on WO3 nanoplates by varying the tin precursor. The density of the SnO2 nanoparticles on the WO3 nanoplates plays a crucial role in the VOC selectivity. The responses of the present mixed metal oxides are found to be much higher than the previously reported results based on single/mixed oxides and noble metal-doped oxides. In addition, the VOC selectivity is found to be highly temperature-dependent, with optimum performance obtained at 200 °C, 300 °C and 350 °C for ammonia, ethanol and acetone, respectively. The present results on the cost-effective noble metal-free WO3-SnO2 sensor could find potential application in human breath analysis by non-invasive detection.

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Section: Sensing Mechanismmentioning

confidence: 99%

Hierarchical nanostructured WO₃–SnO₂for selective sensing of volatile organic compounds

et al. 2015

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“…Those hierarchical ZnO structures showed significantly improved sensitivity and fast response to acetone compared to some other mono-morphological ZnO. Therefore, assembling the porous single-crystalline ZnO nanosheets into flower-like hierarchical structures may further improve the sensing properties because three-dimension (3D) hierarchical structures can provide more spaces for gas diffusion [90,91]. Thus, Au nanoparticles are used to modify flower-like hierarchical ZnO structures assembled by porous single-crystalline nanosheets, which is super-sensitive to acetone with a detection limit of 0.5 ppb [92].…”

Section: Noble Metal Nanoparticle Enhanced Catalytically Sensing Effectmentioning

confidence: 99%

Catalysis-Based Cataluminescent and Conductometric Gas Sensors: Sensing Nanomaterials, Mechanism, Applications and Perspectives

et al. 2016

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Gas environment detection has become more urgent and significant, for both industrial manufacturing and environment monitoring. Gas sensors based on a catalytically-sensing mechanism are one of the most important types of devices for gas detection, and have been of great interest during the past decades. However, even though many efforts have contributed to this area, some great challenges still remain, such as the development of sensitively and selectively sensing catalysts. In this review, two representative catalysis-based gas sensors, cataluminescent and conductometric sensors, the basis of optical and electric signal acquisition, respectively, are summarized comprehensively. The current challenges have been presented. Recent research progress on the working mechanism, sensing nanomaterials, and applications reported by our group and some other researchers have been discussed systematically. The future trends and prospects of the catalysis-based gas sensors have also been presented.

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“…50 Moreover, the hierarchical structure introduces some macropores, which make the adsorption and desorption processes of gas molecules faster, so the sensor made using materials with hierarchical nanostructures oen has short response and recovery times. 50 Moreover, the hierarchical structure introduces some macropores, which make the adsorption and desorption processes of gas molecules faster, so the sensor made using materials with hierarchical nanostructures oen has short response and recovery times.…”

Section: A Possible Gas Sensing Mechanismmentioning

confidence: 99%

The preparation of Cr₂O₃@WO₃ hierarchical nanostructures and their application in the detection of volatile organic compounds (VOCs)

Feng

et al. 2015

RSC Adv.

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hierarchical nanostructures are prepared using a two-step water bath method, which just needs mild conditions and takes little time. The response to xylene of the Cr 2 O 3 @WO 3 -based sensor is much higher (about 4 times) than that of a WO 3 -based sensor, and both of the response and recovery processes are quick. As for the selectivity, the Cr 2 O 3 @WO 3 -based sensor shows a better response to xylene, while the WO 3 -based sensor shows a better response to ethanol. The reason for the response and selectivity change is considered to be that a heterostructure is formed between Cr 2 O 3 (a P-type semiconductor) and WO 3 (an N-type semiconductor). Moreover, Cr 2 O 3 is reported to show catalytic oxidation of methyl groups.

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Flower-like hierarchical structures consisting of porous single-crystalline ZnO nanosheets and their gas sensing properties to volatile organic compounds (VOCs)

Cited by 106 publications

References 41 publications

Hierarchical nanostructured WO₃–SnO₂for selective sensing of volatile organic compounds

Hierarchical nanostructured WO₃–SnO₂for selective sensing of volatile organic compounds

Catalysis-Based Cataluminescent and Conductometric Gas Sensors: Sensing Nanomaterials, Mechanism, Applications and Perspectives

The preparation of Cr₂O₃@WO₃ hierarchical nanostructures and their application in the detection of volatile organic compounds (VOCs)

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Flower-like hierarchical structures consisting of porous single-crystalline ZnO nanosheets and their gas sensing properties to volatile organic compounds (VOCs)

Cited by 106 publications

References 41 publications

Hierarchical nanostructured WO3–SnO2for selective sensing of volatile organic compounds

Hierarchical nanostructured WO3–SnO2for selective sensing of volatile organic compounds

Catalysis-Based Cataluminescent and Conductometric Gas Sensors: Sensing Nanomaterials, Mechanism, Applications and Perspectives

The preparation of Cr2O3@WO3 hierarchical nanostructures and their application in the detection of volatile organic compounds (VOCs)

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Product

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Hierarchical nanostructured WO₃–SnO₂for selective sensing of volatile organic compounds

Hierarchical nanostructured WO₃–SnO₂for selective sensing of volatile organic compounds

The preparation of Cr₂O₃@WO₃ hierarchical nanostructures and their application in the detection of volatile organic compounds (VOCs)