Pyrolyzing Co/Zn bimetallic organic framework to form p-n heterojunction of Co3O4/ZnO for detection of formaldehyde

Sun, Jianhua; Sun, Lixia; Bai, Shouli; Fu, Hong; Guo, Jun; Feng, Yongjun; Luo, Ruixian; Li, Dianqing

doi:10.1016/j.snb.2018.12.080

Cited by 77 publications

(31 citation statements)

References 39 publications

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“…Specifically, as seen in Figure 8c, when the nanocomposite was exposed to air, the p–n heterojunctions made the fabricated sensor display a much higher electric resistance than the pristine sensor during the oxygen ionization process. When NO 2 molecules were injected (Figure 8d), the target molecules reacted with adsorbed oxygen ions with a release of numerous trapped electrons, causing an obvious shrinkage of the p–n heterojunction depletion region [27,48]. Consequently, the obvious improved gas-sensing performances were observed due to the dramatic change of the sensor resistance.…”

Section: Resultsmentioning

confidence: 99%

Hydrothermal Synthesis of SnO2 Nanoneedle-Anchored NiO Microsphere and its Gas Sensing Performances

et al. 2019

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In this study, we reported a successful synthesis of a nanocomposite based on SnO2 nanoneedles anchored to NiO microsphere by a simple two-step hydrothermal route. The results show that the SnO2/NiO nanocomposite-based sensor exhibits more prominent performances than the pristine NiO microsphere to NO2 such as larger responses and more outstanding repeatability. The improved properties are mainly attributed to the p–n heterojunctions formed at the SnO2–NiO interface, leading to the change of potential barrier height and the enlargement of the depletion layer. Besides, the novel and unique nanostructure provides large and effective areas for the surface reaction. In addition, a plausible growth mechanism and the enhanced sensing mechanism were proposed to further discuss the special nanostructure which will benefit the exploration of high-performance sensors.

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Section: Resultsmentioning

confidence: 99%

Hydrothermal Synthesis of SnO2 Nanoneedle-Anchored NiO Microsphere and its Gas Sensing Performances

et al. 2019

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“…The rich mesoporous and increased surface area make the response speed faster, and the response value of 15 wt% Zn 2+ doped SnO 2 HNFs to 100 ppm HCHO can reach 25.7. Sun et al [98] prepared Co 3 O 4 /ZnO composites by calcining bimetallic organic frameworks. The gassensing experiments show that the gas sensor parameters, containing response speed, specificity and linearity, of the composite (Co/Zn = 4:1) were significantly improved compared with the original Co 3 O 4 nanomaterials.…”

Section: Application Of Mof Materialsmentioning

confidence: 99%

Strategies for Improving the Sensing Performance of Semiconductor Gas Sensors for High-Performance Formaldehyde Detection: A Review

2021

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Formaldehyde is a poisonous and harmful gas, which is ubiquitous in our daily life. Long-term exposure to formaldehyde harms human body functions; therefore, it is urgent to fabricate sensors for the real-time monitoring of formaldehyde concentrations. Metal oxide semiconductor (MOS) gas sensors is favored by researchers as a result of their low cost, simple operation and portability. In this paper, the mechanism of formaldehyde detection by gas sensors is introduced, and then the ways of ameliorating the response of gas sensors for formaldehyde detection in recent years are summarized. These methods include the control of the microstructure and morphology of sensing materials, the doping modification of matrix materials, the development of new semiconductor sensing materials, the outfield control strategy and the construction of the filter membrane. These five methods will provide a good prerequisite for the preparation of better performing formaldehyde gas sensors.

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“…Zeolite imidazolate skeletons (ZIFs) are MOF materials with a tetrahedral-type three-dimensional mesh structure, which are similar to zeolites that consist of tetrahedral MN 4 (M = metal cations, such as Zn(II) and Co(II)) and tetrahedral clusters that are connected by imidazolate ligands with ultra-high porosity and substantial internal surface area [98,99]. Moreover, it is found that due to the chemical tenability and structural flexibility, the metal cation can be replaced by another metal without changing its topology [100,101]. Additionally, after changing the metal ion or organic ligand, the ZIF pore size can be easily changed to adjust the gas sieving ability of ZIF, which provides an effective method to improve the controllable selectivity of the sensor [23,34,102].…”

Section: Selection Of Composite Materials With Smox and Mofmentioning

confidence: 99%

Application of Metal-Organic Framework-Based Composites for Gas Sensing and Effects of Synthesis Strategies on Gas-Sensitive Performance

Huang

Zeng

2021

Chemosensors

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Gas sensing materials, such as semiconducting metal oxides (SMOx), carbon-based materials, and polymers have been studied in recent years. Among of them, SMOx-based gas sensors have higher operating temperatures; sensors crafted from carbon-based materials have poor selectivity for gases and longer response times; and polymer gas sensors have poor stability and selectivity, so it is necessary to develop high-performance gas sensors. As a porous material constructed from inorganic nodes and multidentate organic bridging linkers, the metal-organic framework (MOF) shows viable applications in gas sensors due to its inherent large specific surface area and high porosity. Thus, compounding sensor materials with MOFs can create a synergistic effect. Many studies have been conducted on composite MOFs with three materials to control the synergistic effects to improve gas sensing performance. Therefore, this review summarizes the application of MOFs in sensor materials and emphasizes the synthesis progress of MOF composites. The challenges and development prospects of MOF-based composites are also discussed.

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Pyrolyzing Co/Zn bimetallic organic framework to form p-n heterojunction of Co3O4/ZnO for detection of formaldehyde

Cited by 77 publications

References 39 publications

Hydrothermal Synthesis of SnO2 Nanoneedle-Anchored NiO Microsphere and its Gas Sensing Performances

Hydrothermal Synthesis of SnO2 Nanoneedle-Anchored NiO Microsphere and its Gas Sensing Performances

Strategies for Improving the Sensing Performance of Semiconductor Gas Sensors for High-Performance Formaldehyde Detection: A Review

Application of Metal-Organic Framework-Based Composites for Gas Sensing and Effects of Synthesis Strategies on Gas-Sensitive Performance

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