The Experts below are selected from a list of 32925 Experts worldwide ranked by ideXlab platform
H Y Juang - One of the best experts on this subject based on the ideXlab platform.
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wo3 and wtio thin film gas sensors prepared by sol gel Dip Coating
Sensors and Actuators B-chemical, 2002Co-Authors: Jiann Shieh, H M Feng, H Y JuangAbstract:Abstract The WO3 and WTiO thin-films were prepared by sol–gel Dip-Coating on alumina substrate using tungsten chloride, 2,4-pentanedione (PTN), ethanol and water as sources and calcined at 400 °C. The structure was characterized by XRD, Raman, SEM and TEM analyses. The effect of titanium doping on the structure was then discussed and related to the gas sensing properties. The results show that the sensitivities for detecting 10 ppm NO2 were 82 and 1768 by WO3 and WTiO gas sensors at 200 °C, respectively. The huge increase in sensitivity by adding titanium ion arose from the grain size reduction of the films and the doping effect on Debye length. The improved sensitivity, recovery, and reliability suggest that WO3 and WTiO thin-films prepared by sol–gel Dip-Coating can be used for NO2 gas sensing.
Han Wang - One of the best experts on this subject based on the ideXlab platform.
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preparation of highly conductive graphene coated glass fibers by sol gel and Dip Coating method
Journal of Materials Science & Technology, 2019Co-Authors: Minghe Fang, Xuhai Xiong, Yabin Hao, Tengxin Zhang, Han WangAbstract:Abstract In order to fabricate highly-conductive glass fibers using graphene as multi-functional Coatings, we reported the preparation of graphene-coated glass fibers with high electrical conductivity through sol-gel and Dip-Coating technique in a simple way. Graphene oxide (GO) was partially reduced to graphene hydrosol, and then glass fibers were Dipped and coated with the reduced GO (rGO). After repeated sol-gel and Dip-Coating treatment, the glass fibers were fully covered with rGO Coatings, and consequently exhibited increased hydrophobicity and high electrical conductivity. The graphene-coated fibers exhibited good electrical conductivity of 24.9 S/cm, being higher than that of other nanocarbon-coated fibers and commercial carbon fibers, which is mainly attributed to the high intrinsic electrical conductivity of rGO and full coverage of fiber surfaces. The wettability and electrical conductivity of the coated fibers strongly depended on the Dip-Coating times and Coating thickness, which is closely associated with coverage degree and compact structure of the graphene Coatings. By virtue of high conductivity and easy operation, the graphene-coated glass fibers have great potential to be used as flexible conductive wires, highly-sensitive sensors, and multi-functional fibers in many fields.
Jiann Shieh - One of the best experts on this subject based on the ideXlab platform.
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wo3 and wtio thin film gas sensors prepared by sol gel Dip Coating
Sensors and Actuators B-chemical, 2002Co-Authors: Jiann Shieh, H M Feng, H Y JuangAbstract:Abstract The WO3 and WTiO thin-films were prepared by sol–gel Dip-Coating on alumina substrate using tungsten chloride, 2,4-pentanedione (PTN), ethanol and water as sources and calcined at 400 °C. The structure was characterized by XRD, Raman, SEM and TEM analyses. The effect of titanium doping on the structure was then discussed and related to the gas sensing properties. The results show that the sensitivities for detecting 10 ppm NO2 were 82 and 1768 by WO3 and WTiO gas sensors at 200 °C, respectively. The huge increase in sensitivity by adding titanium ion arose from the grain size reduction of the films and the doping effect on Debye length. The improved sensitivity, recovery, and reliability suggest that WO3 and WTiO thin-films prepared by sol–gel Dip-Coating can be used for NO2 gas sensing.
Minghe Fang - One of the best experts on this subject based on the ideXlab platform.
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preparation of highly conductive graphene coated glass fibers by sol gel and Dip Coating method
Journal of Materials Science & Technology, 2019Co-Authors: Minghe Fang, Xuhai Xiong, Yabin Hao, Tengxin Zhang, Han WangAbstract:Abstract In order to fabricate highly-conductive glass fibers using graphene as multi-functional Coatings, we reported the preparation of graphene-coated glass fibers with high electrical conductivity through sol-gel and Dip-Coating technique in a simple way. Graphene oxide (GO) was partially reduced to graphene hydrosol, and then glass fibers were Dipped and coated with the reduced GO (rGO). After repeated sol-gel and Dip-Coating treatment, the glass fibers were fully covered with rGO Coatings, and consequently exhibited increased hydrophobicity and high electrical conductivity. The graphene-coated fibers exhibited good electrical conductivity of 24.9 S/cm, being higher than that of other nanocarbon-coated fibers and commercial carbon fibers, which is mainly attributed to the high intrinsic electrical conductivity of rGO and full coverage of fiber surfaces. The wettability and electrical conductivity of the coated fibers strongly depended on the Dip-Coating times and Coating thickness, which is closely associated with coverage degree and compact structure of the graphene Coatings. By virtue of high conductivity and easy operation, the graphene-coated glass fibers have great potential to be used as flexible conductive wires, highly-sensitive sensors, and multi-functional fibers in many fields.
Alan J. Hurd - One of the best experts on this subject based on the ideXlab platform.
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Fundamentals of sol-gel Dip-Coating
Journal de Physique III, 1994Co-Authors: C. Jeffrey Brinker, Alan J. HurdAbstract:During the process of Dip-Coating, the substrate is withdrawn from the sol at a constant rate. After several seconds, the process becomes steady. The entrained film thins by evaporation of solvent and gravitational draining. Because the shape of the depositing film remains constant with respect to the reservoir surface, it is possible to use analytical methods such as ellipsometry and fluorescence spectroscopy to characterize the depositing film in situ. The microstructure and properties of the film depend on the size and structure of the inorganic sol species, the magnitude of the capillary pressure exerted during drying, and the relative rates of condensation and drying. By controlling these parameters, it is possible to vary the porosity of the film over a wide range.
