Construction of Co3O4/CoWO4 core-shell urchin-like microspheres through ion-exchange method for high-performance acetone gas sensing performance

Qu, Fengdong; Zhang, Nan; Zhang, Shendan; Zhao, Ruiyang; Yao, Dong; Ruan, Shengping; Yang, Minghui

doi:10.1016/j.snb.2020.127711

Cited by 41 publications

(17 citation statements)

References 41 publications

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“…In addition, many oxygen species create a thick hole accumulation layer on the Pt–Co 3 O 4 NCs due to the spill-over effect of Pt nanoparticles because of that the number of oxygen ions is increased and additional reactive sites for acetone detection are created compared with Co 3 O 4 NCs. As a result, the Pt nanoparticles increase the gas-sensing processes, thus resulting in high sensitivity to VOCs. − …”

Section: Results and Discussionmentioning

confidence: 99%

Photodeposition of Pt Nanoparticles on Co₃O₄ Nanocubes for Detection of Acetone at Part-Per-Billion Levels

Baek

Seo

et al. 2021

ACS Appl. Nano Mater.

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Noble-metal-decorated metal oxide sensors have shown promising gas-sensing properties. However, the optimal dispersion of metal particles on a semiconductor is still challenging for most sensing materials. In this study, Co3O4 nanocubes (NCs) and Pt-supported Co3O4 NCs were prepared as sensing materials for acetone gas detection. Transmission electron microscopy and X-ray diffraction were used to examine the structure and exposed facets of Co3O4 NCs. As a result, the Co3O4 NCs were identified as the single-crystalline phase of spinel Co3O4, and each surface exposed the {100} plane. To examine the cocatalytic effect of Pt combined with Co3O4 NCs on the sensing performance, Pt nanoparticles were photodeposited on Co3O4 (Pt–Co3O4 NCs). The Pt–Co3O4 NC-based sensor provided a higher p-type response than the Co3O4 NC sensor in the detection of 500 ppb acetone at 200 °C, with the highest response of 3.1 (R g/R a). The enhanced performance of the Pt–Co3O4 NCs is caused by the exposed {100} planes of Co3O4, in addition to the loaded Pt nanoparticles. The sensor with Co3O4 NCs has a larger neck diameter and hole accumulation layer at the interface than that with Co3O4 nanospheres and thus provides a wide channel for charge carriers, resulting in better gas-sensing responses and high selectivity toward acetone over other volatile compounds. Moreover, the Pt nanoparticles stimulate O2 dissociation on the Co3O4 surface, thus increasing the concentration of chemisorbed oxygen species by the spillover effect. Thus, the incorporation of Pt with Co3O4 NCs promotes the sensitivity of the material in the detection of acetone gas and also enhances the selectivity. This study highlights the possibility of the rapid deposition of metal nanoparticles for the improvement of gas sensors.

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Section: Results and Discussionmentioning

confidence: 99%

Photodeposition of Pt Nanoparticles on Co₃O₄ Nanocubes for Detection of Acetone at Part-Per-Billion Levels

Baek

Seo

et al. 2021

ACS Appl. Nano Mater.

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“…Further improvements are required to enhance their sensitivity to ppb as well as high selectivity towards the targeted gas, particularly at low temperature and high relative humidity. A few materials have met the demands of ppb level detection for healthcare, but they were mostly decorated with noble metals [ 82 ] or incorporated minor metals [ 83 , 84 , 85 , 86 ], which is ideal for practical sensing devices.…”

Section: Health and Medical Monitoringmentioning

confidence: 99%

Nanostructured Gas Sensors: From Air Quality and Environmental Monitoring to Healthcare and Medical Applications

et al. 2021

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In the last decades, nanomaterials have emerged as multifunctional building blocks for the development of next generation sensing technologies for a wide range of industrial sectors including the food industry, environment monitoring, public security, and agricultural production. The use of advanced nanosensing technologies, particularly nanostructured metal-oxide gas sensors, is a promising technique for monitoring low concentrations of gases in complex gas mixtures. However, their poor conductivity and lack of selectivity at room temperature are key barriers to their practical implementation in real world applications. Here, we provide a review of the fundamental mechanisms that have been successfully implemented for reducing the operating temperature of nanostructured materials for low and room temperature gas sensing. The latest advances in the design of efficient architecture for the fabrication of highly performing nanostructured gas sensing technologies for environmental and health monitoring is reviewed in detail. This review is concluded by summarizing achievements and standing challenges with the aim to provide directions for future research in the design and development of low and room temperature nanostructured gas sensing technologies.

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“…Wherein, SnS nanoflakes seems to be an impressive candidate with a sensor response of >1000 at low operating temperature (100 • C). Moreover, the sensor response is stable even after six weeks with a LOD of <5 ppm and response/recovery time of <15 s. Similar to the microspheres [120,121], materials with nanosphere (NSP) structures are also effectively applied in the acetone estimation as noted below. Liu et al and Zhu et al developed the NiO/ZnO and WO 3 -SnO 2 hollow composite NSPs to engage in effective quantitation of acetone via solvothermal and hydrothermal methods, correspondingly [122,123].…”

Section: Diverse Nanostructures In Acetone Detectionmentioning

confidence: 99%

Inorganic-Diverse Nanostructured Materials for Volatile Organic Compound Sensing

Shellaiah

Sun

2021

Sensors

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Environmental pollution related to volatile organic compounds (VOCs) has become a global issue which attracts intensive work towards their controlling and monitoring. To this direction various regulations and research towards VOCs detection have been laid down and conducted by many countries. Distinct devices are proposed to monitor the VOCs pollution. Among them, chemiresistor devices comprised of inorganic-semiconducting materials with diverse nanostructures are most attractive because they are cost-effective and eco-friendly. These diverse nanostructured materials-based devices are usually made up of nanoparticles, nanowires/rods, nanocrystals, nanotubes, nanocages, nanocubes, nanocomposites, etc. They can be employed in monitoring the VOCs present in the reliable sources. This review outlines the device-based VOC detection using diverse semiconducting-nanostructured materials and covers more than 340 references that have been published since 2016.

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Construction of Co3O4/CoWO4 core-shell urchin-like microspheres through ion-exchange method for high-performance acetone gas sensing performance

Cited by 41 publications

References 41 publications

Photodeposition of Pt Nanoparticles on Co₃O₄ Nanocubes for Detection of Acetone at Part-Per-Billion Levels

Photodeposition of Pt Nanoparticles on Co₃O₄ Nanocubes for Detection of Acetone at Part-Per-Billion Levels

Nanostructured Gas Sensors: From Air Quality and Environmental Monitoring to Healthcare and Medical Applications

Inorganic-Diverse Nanostructured Materials for Volatile Organic Compound Sensing

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Construction of Co3O4/CoWO4 core-shell urchin-like microspheres through ion-exchange method for high-performance acetone gas sensing performance

Cited by 41 publications

References 41 publications

Photodeposition of Pt Nanoparticles on Co3O4 Nanocubes for Detection of Acetone at Part-Per-Billion Levels

Photodeposition of Pt Nanoparticles on Co3O4 Nanocubes for Detection of Acetone at Part-Per-Billion Levels

Nanostructured Gas Sensors: From Air Quality and Environmental Monitoring to Healthcare and Medical Applications

Inorganic-Diverse Nanostructured Materials for Volatile Organic Compound Sensing

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Product

Resources

About

Photodeposition of Pt Nanoparticles on Co₃O₄ Nanocubes for Detection of Acetone at Part-Per-Billion Levels

Photodeposition of Pt Nanoparticles on Co₃O₄ Nanocubes for Detection of Acetone at Part-Per-Billion Levels