Preparation and gas-sensitive properties of hollow Zn2SnO4/SnO2 nano-cubes

Ma, Dianpu; Zhang, Lang; Hu, Juntao; Fu, Zewei; Luo, Tao; Yang, Dengfeng; Fang, Dong; Li, Jun; Peng, Jubo; Wang, Yingxu

doi:10.1016/j.inoche.2022.109507

Cited by 10 publications

(4 citation statements)

References 51 publications

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“…Table shows the gas-sensing characteristics of the previously reported ethanol gas sensors based on various materials. − It can be seen from the table that Fe 2 O 3 @NiO has significantly improved its performance in operating temperature, response value, detection limit, humidity range, etc. Its excellent ethanol gas sensitivity and high-humidity adaptability can provide an excellent sensing unit for exhaled ethanol detection.…”

Section: Resultsmentioning

confidence: 99%

Hollow-Out Fe₂O₃-Loaded NiO Heterojunction Nanorods Enable Real-Time Exhaled Ethanol Monitoring under High Humidity

Zhou

et al. 2023

ACS Appl. Mater. Interfaces

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The analysis of exhaled breath has opened up new exciting avenues in medical diagnostics, sleep monitoring, and drunk driving detection. Nevertheless, the detection accuracy is greatly affected due to high humidity in the exhaled breath. Here, we propose a regulation method to solve the problem of humidity adaptability in the ethanol-monitoring process by building a heterojunction and hollow-out nanostructure. Therefore, large specific surface area hollow-out Fe2O3-loaded NiO heterojunction nanorods assembled by porous ultrathin nanosheets were prepared by a well-tailored interface reaction. The excellent response (51.2 toward 10 ppm ethanol at 80% relative humidity) and selectivity to ethanol under high relative humidity with a lower operating temperature (150 °C) were obtained, and the detection limit was as low as 0.5 ppb with excellent long-term stability. The superior gas-sensing performance was attributed to the high surface activity of the heterojunction and hollow-out nanostructure. More importantly, GC–MS, diffuse reflectance Fourier transform infrared spectroscopy, and DFT were utilized to analyze the mechanisms of heterojunction sensitization, ethanol-sensing reaction, and high-humidity adaptability. Our integrated low-power MEMS Internet of Things (IoT) system based on Fe2O3@NiO successfully demonstrates the functional verification of ethanol detection in human exhalation, and the integrated voice alarm and IoT positioning functions are expected to solve the problem of real-time monitoring and rapid initial screening of drunk driving. Overall, this novel method plays a vital role in areas such as control of material morphology and composition, breath analysis, gas-sensing mechanism research, and artificial olfaction.

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Section: Resultsmentioning

confidence: 99%

Hollow-Out Fe₂O₃-Loaded NiO Heterojunction Nanorods Enable Real-Time Exhaled Ethanol Monitoring under High Humidity

Zhou

et al. 2023

ACS Appl. Mater. Interfaces

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“…When ethanol gas is introduced, ethanol molecules quickly react with oxygen negative ions adsorbed on the surface of the SnO 2 grains, converting into CO 2 and H 2 O and releasing electrons, as shown in equations ( 10), (11), and (12). Moreover, the dynamic diameter of ethanol gas molecules is 0.43nm [38], which is much smaller than the pore diameter between SnO 2 particles of 6.72nm.…”

Section: Discussionmentioning

confidence: 99%

“…SnO 2 nano-sheets with two-dimensional scale have a high specific surface area, which accelerates the electron transfer rate, thus possessing excellent gassensing performance [10]. The SnO 2 with three-dimensional morphology, such as cubic [11], sea urchin [12], and nanoflower [13], can provide more active sites to improve the response recovery speed and stability of the material, and accelerate the diffusion of reducing gases between SnO 2 particles, thereby improving the gas sensitivity of SnO 2 . This makes the regulation of the three-dimensional morphology of SnO 2 a research hot topic and focus in the field of gas-sensing performance.…”

Section: Introductionmentioning

confidence: 99%

Preparation of nanocrystalline stacked spherical SnO2 with higher specific surface area and its gas-sensing performance

ZHENG,

Liu,

Wang

et al. 2024

Preprint

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In order to improve the sensitivity of SnO2 to ethanol gas, the spherical SnO2 with a particle size of 0.25μm and uniform particle distribution was prepared by hydrothermal method without adding surfactants. The characterizations were conducted，and the results showed that the spherical SnO2 particles were stacked by fine grains with a grain size of 4nm, with a higher specific surface area of 232.2043m2/g than existing research results. The gas-sensing performance test results show that the spherical SnO2 has the best gas-sensing selectivity to ethanol, with an optimal working temperature of 300℃. When the ethanol concentration is 100ppm, the gas sensitivity of spherical SnO2 to ethanol is 48.28, with a response time of 4s and a recovery time of 15s. Even to low concentration ethanol of 2ppm, the sensitivity of the spherical SnO2 can reach 4.6, indicating excellent gas-sensing performance of the spherical SnO2. This study provides data reference for the research and development of high-performance gas sensors.

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“…Pan et al developed Ni-doped ZnO nanostructured materials for excellent N -butanol sensing performance, with long-term stability of up to 35 days. Long-term stability of a porous gas sensor was also observed for hydrogen sulfide, ethanol and formaldehyde, and NO 2 . In addition, control of the pore size is critical to avoid water vapor condensation in smaller pores, and poisonous effects caused by larger pores .…”

Section: Perspective and Conclusionmentioning

confidence: 96%

Review on Porosity Control in Nanostructured Semiconducting Metal Oxides and Its Influence on Chemiresistive Gas Sensing

Bulemo

Cheong

2023

ACS Appl. Nano Mater.

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Nanostructured semiconducting metal oxides (SMOs) hold the potential for playing a critical role in gas-sensing applications due to their interconnected nanograins, large surface area, and shorter diffusion length. The rational introduction of ubiquitous porosity in SMOs can enhance gas/air diffusion as well as the accessibility of nanograins and reactive sites. Although much work has been researched for adopting highly porous nanostructured SMOs to enhance gas sensing, no comprehensive review on porosity control has yet been presented. In this review, the latest porosity control methods for SMOs, structural properties, and their gas-sensing results are reported. Finally, perspective on porosity control methods and future directions are provided for further development and research of porous SMO-based gas-sensing nanomaterials.

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Preparation and gas-sensitive properties of hollow Zn2SnO4/SnO2 nano-cubes

Cited by 10 publications

References 51 publications

Hollow-Out Fe₂O₃-Loaded NiO Heterojunction Nanorods Enable Real-Time Exhaled Ethanol Monitoring under High Humidity

Hollow-Out Fe₂O₃-Loaded NiO Heterojunction Nanorods Enable Real-Time Exhaled Ethanol Monitoring under High Humidity

Preparation of nanocrystalline stacked spherical SnO2 with higher specific surface area and its gas-sensing performance

Review on Porosity Control in Nanostructured Semiconducting Metal Oxides and Its Influence on Chemiresistive Gas Sensing

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Preparation and gas-sensitive properties of hollow Zn2SnO4/SnO2 nano-cubes

Cited by 10 publications

References 51 publications

Hollow-Out Fe2O3-Loaded NiO Heterojunction Nanorods Enable Real-Time Exhaled Ethanol Monitoring under High Humidity

Hollow-Out Fe2O3-Loaded NiO Heterojunction Nanorods Enable Real-Time Exhaled Ethanol Monitoring under High Humidity

Preparation of nanocrystalline stacked spherical SnO2 with higher specific surface area and its gas-sensing performance

Review on Porosity Control in Nanostructured Semiconducting Metal Oxides and Its Influence on Chemiresistive Gas Sensing

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Hollow-Out Fe₂O₃-Loaded NiO Heterojunction Nanorods Enable Real-Time Exhaled Ethanol Monitoring under High Humidity

Hollow-Out Fe₂O₃-Loaded NiO Heterojunction Nanorods Enable Real-Time Exhaled Ethanol Monitoring under High Humidity