Tube in tube ZnO/ZnCo<sub>2</sub>O<sub>4</sub> nanostructure synthesized by facile single capillary electrospinning with enhanced ethanol gas-sensing properties

Alali, Khaled Tawfik; Liu, Jingyuan; Liu, Qi; Li, Zhanshuang; Liu, Peili; Aljebawi, Kassem; Wang, Jun

doi:10.1039/c6ra28585f

Cited by 37 publications

(10 citation statements)

References 29 publications

(69 reference statements)

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“…It is reported that In-doped 3DOM ZnO showed a response of 88 to 100 ppm ethanol at the optimal working temperature of 250 °C, and Co-doped ZnO nanorods showed a response as high as 129 to 100 ppm ethanol at 350 °C . SnO 2 –ZnO hetero-nanofibers and Fe-doped lotus-like ZnO showed responses of 78 and 24 to 100 ppm ethanol at 300 and 400 °C, , respectively. A few ZnO-based sensors with working temperature lower than 200 °C were also reported.…”

Section: Resultsmentioning

confidence: 99%

“…As shown in Table , 5%Co/ZnO-300 has a higher electron carrier concentration, larger Hall mobility, and lower resistivity than ZnO-300. The higher electron concentration is beneficial to the adsorption of more O 2 , which can contribute to the enhancement of the gas-sensing performance. , …”

Section: Resultsmentioning

confidence: 99%

“…The higher electron concentration is beneficial to the adsorption of more O 2 , which can contribute to the enhancement of the gas-sensing performance. 1,48 XPS studies were carried out to analyze the surface elemental compositions of ZnO-300 and 5%Co/ZnO-300, and the XPS fitting was carried out by fixing the location and quantity of the peaks and Gaussian−Lorentzian ratio (20%). As shown in Figure 7a,b, only C, Zn, O, and Co elements are detected, indicating that no impurities are present in the obtained samples.…”

Section: Industrial and Engineering Chemistry Researchmentioning

confidence: 99%

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Facile Fabrication of Mesoporous Hierarchical Co-Doped ZnO for Highly Sensitive Ethanol Detection

Shi

Qin

et al. 2019

Ind. Eng. Chem. Res.

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The development of highly sensitive gas-sensing materials for the detection of volatile organic compounds at low temperature is vital for gas sensors. Herein, novel mesoporous hierarchical Co-doped ZnO was successfully constructed by calcining layered zinc hydroxide precursors prepared through a facile hydrothermal route. The hierarchical architectures of the precursors were preserved after their conversion to mesoporous Co-doped ZnO through calcination, and the obtained mesoporous hierarchical Co-doped ZnO was systematically characterized by X-ray powder diffraction, scanning electron microscopy, high-resolution transmission electron microscopy, nitrogen adsorption−desorption analysis, and X-ray photoelectron spectra. The hierarchical Co-doped ZnO was assembled by many thin nanosheets composed of small nanoparticles (8.6 nm), and the hierarchical Co-doped ZnO with 5 atom % doping amount has a specific surface area of 111.7 m 2 g −1 and abundant mesopores in the range of 2−50 nm. Gas-sensing tests demonstrate that the hierarchical 5 atom % Co-doped ZnO showed a sensing response of 54 to 50 ppm ethanol at the low operating temperature of 180 °C, and the response followed a good linear relationship with 5−160 ppm ethanol. Moreover, the hierarchical Co-doped ZnO also exhibited distinctive selectivity, good response repeatability, and preferable long-term stability to ethanol, indicating that the nanosheet-assembled mesoporous hierarchical Co-doped ZnO has potential applications in high-performance gassensing materials working at low temperature.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Industrial and Engineering Chemistry Researchmentioning

confidence: 99%

See 1 more Smart Citation

Facile Fabrication of Mesoporous Hierarchical Co-Doped ZnO for Highly Sensitive Ethanol Detection

Shi

Qin

et al. 2019

Ind. Eng. Chem. Res.

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“…An illustration of the electrical circuit of the sensor is exhibited in Figure S4 (in the Supporting Information). During exposure to gas, a change in the resistance of the sensors’ circuit will result from the chemisorption reaction of the sensing material with gas molecules, which will be measured and presented as the output voltage ( V out ) …”

Section: Methodsmentioning

confidence: 99%

HFIP‐Functionalized Co₃O₄ Micro‐Nano‐Octahedra/rGO as a Double‐Layer Sensing Material for Chemical Warfare Agents

Alali

Liu

Chen

et al. 2019

Chemistry A European J

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Semiconductor metal oxides (SMO)‐based gas‐sensing materials suffer from insufficient detection of a specific target gas. Reliable selectivity, high sensitivity, and rapid response–recovery times under various working conditions are the main requirements for optimal gas sensors. Chemical warfare agents (CWA) such as sarin are fatal inhibitors of acetylcholinesterase in the nerve system. So, sensing materials with high sensitivity and selectivity toward CWA are urgently needed. Herein, micro‐nano octahedral Co3O4 functionalized with hexafluoroisopropanol (HFIP) were deposited on a layer of reduced graphene oxide (rGO) as a double‐layer sensing materials. The Co3O4 micro‐nano octahedra were synthesized by direct growth from electrospun fiber templates calcined in ambient air. The double‐layer rGO/Co3O4‐HFIP sensing materials presented high selectivity toward DMMP (sarin agent simulant, dimethyl methyl phosphonate) versus rGO/Co3O4 and Co3O4 sensors after the exposure to various gases owing to hydrogen bonding between the DMMP molecules and Co3O4‐HFIP. The rGO/Co3O4‐HFIP sensors showed high stability with a response signal around 11.8 toward 0.5 ppm DMMP at 125 °C, and more than 75 % of the initial response was maintained under a saturated humid environment (85 % relative humidity). These results prove that these double‐layer inorganic–organic composite sensing materials are excellent candidates to serve as optimal gas‐sensing materials.

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“…The spinning starts after the application of a high voltage between the syringe needle and the collector. The feed rate of the polymeric solution, the applied voltage, the distance work, and the physicochemical properties of the polymeric solution are some of the critical parameters of the electrospinning process that must be adjusted . Under the effect of the applied electrical field, a conical fluid shape ( a Taylor cone) will form at the tip of the syringe needle, and at a critical value of the applied voltage, the charged polymeric solution will overcome the surface tension forces causing a jet to erupt from the tip of Taylor cone.…”

Section: Electrospinning Technique and Its Parametersmentioning

confidence: 99%

Grown Carbon Nanotubes on Electrospun Carbon Nanofibers as a 3D Carbon Nanomaterial for High Energy Storage Performance

Alali

Liu

et al. 2019

ChemistrySelect

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Carbon hierarchical nanostructures have been widely applied because of their outstanding properties and large surface area. Future energy materials for applications, such as Li‐ion, Li‐sulfur, Li‐air batteries, and supercapacitors require materials with high energy density and power capability. The preparation of three‐dimensional (3D) carbon nanotubes (CNTs)‐carbon nanofibers (CNFs) nanomaterials through a multi‐step process has many difficulties. The aggregation, the high expense of CNTs, and the difficult conditions for synthesizing CNTs have pushed researchers to consider new methods. The direct growth of CNTs on CNFs via one‐step electrospinning and a combined pyrolysis process is an efficient method for preparing 3D CNTs‐CNFs, as demonstrated in the literature. Herein, the importance of the hybrid 3D CNTs‐CNFs nanomaterials is reviewed, as well as their growth mechanisms, and the parameter influence on the morphology of grown CNTs. Moreover, the performance of the electrochemical energy storage for the hybrid CNTs grown on CNFs in the literature is reviewed and explained. Finally, the nanomaterials form the CNTs grown CNFs have great potential for various applications.

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Tube in tube ZnO/ZnCo₂O₄ nanostructure synthesized by facile single capillary electrospinning with enhanced ethanol gas-sensing properties

Abstract: Tube in tube nanostructure of ZnO/ZnCo2O4 was achieved using electrospinning technology. The complex tubular structure and n–p heterojunction are potential reasons for the excellent gas sensing performance of ZnO/ZnCo2O4 tube in tube nanostructure.

Cited by 37 publications

References 29 publications

Facile Fabrication of Mesoporous Hierarchical Co-Doped ZnO for Highly Sensitive Ethanol Detection

Facile Fabrication of Mesoporous Hierarchical Co-Doped ZnO for Highly Sensitive Ethanol Detection

HFIP‐Functionalized Co₃O₄ Micro‐Nano‐Octahedra/rGO as a Double‐Layer Sensing Material for Chemical Warfare Agents

Grown Carbon Nanotubes on Electrospun Carbon Nanofibers as a 3D Carbon Nanomaterial for High Energy Storage Performance

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Tube in tube ZnO/ZnCo2O4 nanostructure synthesized by facile single capillary electrospinning with enhanced ethanol gas-sensing properties

Abstract: Tube in tube nanostructure of ZnO/ZnCo2O4 was achieved using electrospinning technology. The complex tubular structure and n–p heterojunction are potential reasons for the excellent gas sensing performance of ZnO/ZnCo2O4 tube in tube nanostructure.

Cited by 37 publications

References 29 publications

Facile Fabrication of Mesoporous Hierarchical Co-Doped ZnO for Highly Sensitive Ethanol Detection

Facile Fabrication of Mesoporous Hierarchical Co-Doped ZnO for Highly Sensitive Ethanol Detection

HFIP‐Functionalized Co3O4 Micro‐Nano‐Octahedra/rGO as a Double‐Layer Sensing Material for Chemical Warfare Agents

Grown Carbon Nanotubes on Electrospun Carbon Nanofibers as a 3D Carbon Nanomaterial for High Energy Storage Performance

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Tube in tube ZnO/ZnCo₂O₄ nanostructure synthesized by facile single capillary electrospinning with enhanced ethanol gas-sensing properties

HFIP‐Functionalized Co₃O₄ Micro‐Nano‐Octahedra/rGO as a Double‐Layer Sensing Material for Chemical Warfare Agents