Oxygen vacancies enhancing acetone-sensing performance

Hou, Xiangyan; Liu, Huan-Huan; Zhang, Yimeng; Jiang, Mengpei; Yuan, Long; Shi, Jingyu; Hou, Changmin

doi:10.1016/j.mtchem.2020.100372

Cited by 15 publications

(14 citation statements)

References 52 publications

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“…Hou et al also reported that oxygen vacancies can be of immense benefit to the gas-sensitive properties. Specifically, the increased oxygen vacancies will lead to the local lattice disorder and improve the sensing performance . The XPS spectra in Figure f also prove that BiOBr/ZnO composites are rich in oxygen vacancies, which provide a great deal of active sites for the adsorption of oxygen species and TEA molecules, enhancing the gas sensitive performance of the BiOBr/ZnO sensor.…”

Section: Results and Discussionmentioning

confidence: 86%

Triethylamine Gas Sensors Based on BiOBr Microflowers Decorated with ZnO Nanocrystals

Wang

Liu

et al. 2022

ACS Appl. Nano Mater.

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In this work, ZnO nanocrystals (NCs) are innovatively decorated on the hierarchically porous microflowers (MFs) of BiOBr. The preparation is accompanied by the construction of n−n nano-heterojunctions. The crystallographic information, microstructure, oxygen vacancy, and gas sensing performances of BiOBr/ZnO composites are investigated. The BiOBr/ZnO sensor presents excellent response characteristics to triethylamine (TEA). Compared with BiOBr MFs and pure ZnO NCs, the BiOBr/ZnO composite sensor exhibits a higher response (R a /R g ) of about 20.57 to 100 ppm TEA at 200 °C. The sensor also shows good selectivity and durable long-term stability, besides the low detection limit of 112 ppb. Even more appealingly, the response time is only 4 s. The improved TEA sensing performance of BiOBr MFs modified with ZnO NCs can be mainly attributed to the unique hierarchical heterogeneous microstructure. Furthermore, the construction of n−n BiOBr/ZnO heterostructures leads to a large specific surface area and effective electron transport, which facilitate the surface reaction and diffusion of TEA molecules. The BiOBr/ZnO composite sensor based on n−n nano-heterojunctions may provide a valuable strategy for the detection of volatile organic compounds.

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Section: Results and Discussionmentioning

confidence: 86%

Triethylamine Gas Sensors Based on BiOBr Microflowers Decorated with ZnO Nanocrystals

Wang

Liu

et al. 2022

ACS Appl. Nano Mater.

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“…Deficient oxygen, on the other hand, gives more free electrons as electron donors and active sites. 37 As for 2Pt-In 2 O 3 samples, the relative percentage of the O v + O c component significantly increases from 46.42% to 55.08%, which means that compared with pure In 2 O 3 , more surface chemisorbed oxygen and reactive oxygen were involved in the electron transfer process on the material surface. 12 The N 2 adsorption−desorption isotherms and pore size distribution curves of 2Pt-In 2 O 3 are shown in Figure 6.…”

Section: Synthesis Of Pure In 2 O 3 Hollow Microspheresmentioning

confidence: 84%

Enhanced Acetone-Sensing Properties of Pt-Decorated In₂O₃ Hollow Microspheres Derived from Pt-Embedded Template

et al. 2023

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Pt-decorated In 2 O 3 hollow microspheres were prepared using a template and reflux method. The size of the prepared carbon templates was adjusted from 200 nm to 1.3 μm by introducing chloroplatinic acid during the hydrothermal process. At the same time, Pt nanoparticles inside the carbon layer were protected from oxidation and agglomeration. Also, the folds created on the surface of the hollow sphere during shrinkage led to a substantial increase in specific surface area. The response of the In 2 O 3 -based sensor toward acetone was significantly enhanced by the addition of Pt decoration. This improvement can be attributed to the increased availability of active sites for the target gas and the consequential alteration of the energy band structure. In addition, high response sensitivity, rapid dynamic processes, long-term reliability, and selectivity have all been achieved. The detectable limit is less than 1 ppm, which might satisfy the 1.8 ppm threshold value in the exhaled breath of patients with diabetes. Consequently, the proposed sensor has great sensitivity and can detect lowconcentration of acetone, making it an ideal choice for applications such as monitoring daily dietary intake, managing diabetes, and inspecting industrial production processes.

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“…Due to the complexity of the gas sensing process, semiconductor nanomaterial gas sensors face the problems of improved selectivity and response. − Many effective strategies have been tried to solve these problems, such as morphology control, composition regulation, noble metal decoration, and carbon-based two-dimensional nanomaterial application. − Although these methods can effectively optimize gas sensor properties, the interaction mechanism between gas molecules and the sensitive material is still unclear. − Therefore, it is necessary to study the semiconductor gas sensing behavior to understand the relationship between the gas sensing performance and the crystal structure of sensing materials.…”

Section: Introductionmentioning

confidence: 99%

Controlling the Crystal Phase Structure of WO₃ Nanosheet-Based Hierarchical Spheres for Enhanced Gas Sensing Performance

Yang

Cao

et al. 2022

ACS Appl. Nano Mater.

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The pursuit of high performance is the eternal theme in gas sensor research. Because of the complexity of the response and recovery processes, the selective detection, high response, rapid response, and recovery remain challenging in the atmospheric environment. In this paper, WO3 hierarchical spheres (WO3 HS) with different crystalline phase ratios are successfully synthesized to evaluate the relationship between the phase structure and gas-sensitive properties. The as-prepared WO3-2 HS samples achieve superior gas sensing characteristics including high response (S = 24.2) and fast response and recovery speed (1 and 19 s) to 100 ppm acetone at 300 °C. The superior acetone sensing performance probably originates from the regulation of the phase ratios of nanosheet-based WO3. With the decrease of orthorhombic phase and the increase of monoclinic phase, the specificity detection to acetone is increased significantly. The reasons for such a huge selectivity change are discussed in detail. From the perspective of reaction kinetics, we also compare the contributions of specific surface area and crystalline phase impacting the gas sensing performance.

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Oxygen vacancies enhancing acetone-sensing performance

Cited by 15 publications

References 52 publications

Triethylamine Gas Sensors Based on BiOBr Microflowers Decorated with ZnO Nanocrystals

Triethylamine Gas Sensors Based on BiOBr Microflowers Decorated with ZnO Nanocrystals

Enhanced Acetone-Sensing Properties of Pt-Decorated In₂O₃ Hollow Microspheres Derived from Pt-Embedded Template

Controlling the Crystal Phase Structure of WO₃ Nanosheet-Based Hierarchical Spheres for Enhanced Gas Sensing Performance

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Oxygen vacancies enhancing acetone-sensing performance

Cited by 15 publications

References 52 publications

Triethylamine Gas Sensors Based on BiOBr Microflowers Decorated with ZnO Nanocrystals

Triethylamine Gas Sensors Based on BiOBr Microflowers Decorated with ZnO Nanocrystals

Enhanced Acetone-Sensing Properties of Pt-Decorated In2O3 Hollow Microspheres Derived from Pt-Embedded Template

Controlling the Crystal Phase Structure of WO3 Nanosheet-Based Hierarchical Spheres for Enhanced Gas Sensing Performance

Contact Info

Product

Resources

About

Enhanced Acetone-Sensing Properties of Pt-Decorated In₂O₃ Hollow Microspheres Derived from Pt-Embedded Template

Controlling the Crystal Phase Structure of WO₃ Nanosheet-Based Hierarchical Spheres for Enhanced Gas Sensing Performance