Entity

Time filter

Source Type


Du J.,Taiyuan University of Technology | Du J.,Rutgers University | Wu J.,Taiyuan University of Technology | Zhao R.,Shanxi Kunming Tobacco Ltd Liability Company | And 3 more authors.
Materials Today: Proceedings | Year: 2016

Graphene-doped zinc oxide with column-like morphology was synthesized by an in-situ hydrothermal method. Their gas-sensing properties were then studied. The results indicated that zinc oxide decorated with graphene exhibits high selectivity for detection of ethylene glycol upon exposure to mixture of various volatile gases, and it has an enhanced response to different concentrations of ethylene glycol at 160 °C. The response and recovery times for 5 ppm ethylene glycol are 1 and 14 s, respectively, implying the unique-shape zinc oxide doped with graphene is effective for detection of low-concentration ethylene glycol. © 2016 Elsevier Ltd.


Du J.,Taiyuan University of Technology | Zhao R.,Shanxi Kunming Tobacco Ltd Liability Company | Xie Y.,Taiyuan University of Technology | Li J.,Taiyuan University of TechnologyShanxi
Applied Surface Science | Year: 2015

Tin dioxide quantum dots (TQDs) with controllable size were synthesized by changing the amount of alkaline reagent in the hydrothermal process. The gas-sensing properties were investigated by operating chemoresistor type sensor. The morphology and structure were characterized by X-ray diffraction, scanning/transmission electron microscopy, UV-vis and Raman spectrometry. The as-synthesized SnO2 shows the characteristics of quantum dots and the narrowest size distribution is about 2-3 nm. The gas-sensing results indicate that the responses are strongly dependent on the size of quantum dots. TQDs with different sizes exhibit different sensitivities and selectivities to volatile toxic chemicals such as aldehyde, acetone, methanol, ethanol and amine. Especially, when the sensors are exposed to 100 ppm triethylamine (TEA), the sensing response value of TQDs with small size is two times higher than that of the large-size TQDs. The maximum response values of TQDs to 1 ppm and 100 ppm TEA are 15 and 153, respectively. The response time is 1 s and the recovery time is 47 s upon exposure to 1 ppm TEA. The results suggest that it is an effective method by regulating the size of SnO2 quantum dots to detect low-concentration hazardous volatile compounds. © 2015 Elsevier B.V. All rights reserved.


Zhao R.,Shanxi Kunming Tobacco Ltd Liability Company | Chen J.,Shanxi Kunming Tobacco Ltd Liability Company | Liu J.,Shanxi Kunming Tobacco Ltd Liability Company | Fan J.,Shanxi Kunming Tobacco Ltd Liability Company | Du J.,Taiyuan University of Technology
Materials Letters | Year: 2015

The morphologies-controlled silicalite-1 with mesoporous structure was synthesized in fluoride media and the adsorption properties were also investigated. The results show that the morphology of samples can be tailored by synergy effect of fluoride ion, alkaline reagent and reaction condition. The brick and sword-like silicalite-1 is more effective to adsorb CO2 and CH4 compared with microsphere, which suggests that the morphology-controlled silicalite-1 with mesoporous structure has a potential application in decreasing harmful gas emission of cigarette smoking. © 2014 Elsevier B.V. All rights reserved.


Du J.,Taiyuan University of Technology | Zhao R.,Shanxi Kunming Tobacco Ltd Liability Company | Xue Y.,Taiyuan University of Technology
Journal of Chemical Thermodynamics | Year: 2012

Thermodynamic properties and equilibrium constant of reaction in nanosystems were analyzed theoretically. The effects of sizes of nano-CuO on thermodynamic properties and equilibrium constant were studied using the reaction of nano-copper oxide and sodium bisulfate as a system. The experimental results indicate that with the sizes of reactant decreasing, the molar Gibbs free energy (ΔrGm), the molar enthalpy (ΔrHm) and the molar entropy (Δ rSm) decrease, but the equilibrium constant (K) increases and there are linear trends between the reciprocal of sizes for nano-CuO and the values of ΔrGm, ΔrHm, ΔrSm and Ln K, which are in agreement with the theoretical analysis. © 2011 Elsevier Ltd. All rights reserved.


Du J.,Taiyuan University of Technology | Du J.,Shanxi Institute of Coal CAS Chemistry | Zhao R.,Shanxi Kunming Tobacco Ltd Liability Company | Zhu Z.,Shanxi Institute of Coal CAS Chemistry
Physica Status Solidi (A) Applications and Materials Science | Year: 2011

Uniform small onion-like carbon (OLC) modified with molybdenum carbide has been synthesized by a one-step process, using detonation-assisted chemical vapor deposition. The obtained material was characterized by transmission electron microscope, energy-dispersive X-ray spectroscopy, Raman spectroscopy, and X-ray diffraction. The results show that the OLC have almost perfect onion structures containing about 7-10 closed shells and exhibit a narrow distribution of 4-6 nm when the C/Mo ratio is about 150. The hexagonal molybdenum carbide (Mo 2C) is dispersed on the surface of OLC. The size of OLC can be controlled by adjusting the C/Mo ratios. The formation mechanism of the nanocomposites of OLC and Mo 2C is briefly discussed. © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Discover hidden collaborations