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Sökning: WFRF:(Fu Yifeng 1984)

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91.
  • Zhang, Yong, 1982, et al. (författare)
  • Characterization and simulation of liquid phase exfoliated graphene-based films for heat spreading applications
  • 2016
  • Ingår i: Carbon. - 0008-6223. ; 106, s. 195-201
  • Tidskriftsartikel (refereegranskat)abstract
    • This paper concerns the thermal properties of graphene-based films for heat spreading applications. Following liquid phase exfoliation (LPE) films were made by two different methods, vacuum filtration and drop coating. Temperature decreases of up to 6 °C and 4 °C were measured at a heat flux density of 1200 W/cm2 for the vacuum filtrated and drop coated films respectively. For the first time in this paper, three different methods were combined to evaluate and predict the thermal performance of such graphene-based films. Resistance thermometers were used to monitor the hotspot temperature decrease versus the Joule heat flow as a result of using graphene-based heat spreaders. The 3ω method was used to experimentally determine the in-plane and through-plane thermal conductivities of such films. A finite element model of the hotspot test structure was setup using the in-plane and through-plane thermal conductivities (110 and 0.25 W/mK, respectively) obtained from the 3ω measurements. Simulations were performed to predict the hotspot temperature decrease with excellent agreement obtained between all methods. The results indicate that the alignment and purity of the graphene-based films, as well as their thermal boundary resistance with respect to the chip, are key parameters when determining the thermal performance of graphene-based heat spreaders.
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92.
  • Zhang, Yong, 1982, et al. (författare)
  • Chemical vapor deposition grown graphene on Cu-Pt alloys
  • 2017
  • Ingår i: Materials Letters. - 0167-577X. ; 193, s. 255-258
  • Tidskriftsartikel (refereegranskat)abstract
    • In this letter, the results from a series of experiments where graphene was grown on copper-platinum (Cu-Pt) alloy foils by chemical vapor deposition (CVD) are presented. By using Raman spectroscopy to analyze graphene films grown on Pt-Cu alloy foils with different Cu/Pt weight ratios (75/25, 50/50 and 25/75), we could show how the Cu/Pt weight ratio affected both the quality and the number of layers in the as-synthesized graphene films. Furthermore, graphene growth was shown to occur at temperatures as low as 750 °C due to what we believe is the strong catalytic ability of the Cu-Pt alloy foils. By keeping the flow rate of the CH4 precursor gas as low as 1.5 sccm, a low growth rate was obtained where the growth rates of monolayer and bilayer graphene could be controlled by simply adjusting the growth time.
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93.
  • Zhang, Yan, 1976, et al. (författare)
  • Experimental study of Electrical properties and stability of CNT bumps in high density interconnects
  • 2013
  • Ingår i: Proceedings of the 13th IEEE International Conference on Nanotechnology. - 1944-9380. ; , s. 1085-1088
  • Konferensbidrag (refereegranskat)abstract
    • With the minimization development of electronic devices and products, nanotechnology and nanomaterials are widely applied in different fields of electronic packaging. Carbon nanotube (CNT) is an ideal material due to its excellent electrical and thermal conductivities. In the present paper, the application of CNT bundles as chip bumps was experimentally investigated. The electrical resistances of the CNT interconnects were measured, and the thermal and humidity test were conducted. In addition, the CNT forests on fine pitch copper lines under various environmental test conditions were observed to evaluate the stability. © 2013 IEEE.
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94.
  • Zhang, Yong, 1982, et al. (författare)
  • Graphene-based heater
  • 2016
  • Ingår i: IMAPS Nordic Annual Conference 2016; Tonsberg; Norway; 5-7 June 2016.
  • Konferensbidrag (refereegranskat)abstract
    • The excellent thermal conductivity and optical transmittance of graphene make it tremendously interesting as a material for heating applications. In this paper, we demonstrate graphene can be used as a new heating element. The graphene is synthesized by chemical vapor deposition (CVD) on Cu foil. The heating performance is studied in terms of applied voltage, heating rate and input power density. A two-layer graphene film based heater can reach an equilibrium temperature up to 90C when 60 V voltage is applied for 2 min. A maximum heating rate of 1.1 C/s was observed under an applied voltage of 60 V. The results indicate that the graphene-based heater holds great promise for many applications such as defrosting and antifogging devices.
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95.
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96.
  • Zhang, Yan, et al. (författare)
  • Study on the verification of IR and RTD methods applied in the thermal measurement of high power chips
  • 2014
  • Ingår i: 15th International Conference on Electronic Packaging Technology, ICEPT 2014; Wangjiang HotelChengdu; China; 12 August 2014 through 15 August 2014. ; , s. 1507-1511
  • Konferensbidrag (refereegranskat)abstract
    • In the present paper, a chip with a Pt-based RTD that functions as a heater and sensor is tested under serial power loads, and infrared (IR) thermal imaging system is adopted to obtain the thermal measurement. Comparisons of the hotspot temperatures of the chip obtained by RTD and IR methods have been made, where different surfaces of the chip were observed by the IR camera. Combing with the heat conduction law, the IR results of the test chip with surface preparation showed quite a good agreement with the RTD data, verifying the validation of the IR analysis method.
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97.
  • Zhang, Yong, 1982, et al. (författare)
  • Use of graphene-based films for hot spot cooling
  • 2014
  • Ingår i: Proceedings of the 5th Electronics System-Integration Technology Conference, ESTC 2014. ; , s. Art. no. 6962834-
  • Konferensbidrag (refereegranskat)abstract
    • Efficient heat dissipation is becoming an urgent demand in electronics and optoelectronics because of increasing power density, which is generating more heat than ever. Graphene, an atomic layer of carbon, has been shown to have high thermal conductivity, which makes this material a promising candidate for heat dissipation in electronics. Here, we demonstrate a new type of graphene-based film on a test platform to alleviate the thermal issues. Taking advantage of its high in-plane thermal conductivity, CVD-grown graphene has been observed to possess a strong heat-spreading ability. In this paper, a chemical conversion process, including chemical oxidation, exfoliation and reduction, is utilised to fabricate the graphene-based films. Additionally, functionalisation of the film was also performed to diminish the interface thermal resistance between the chip surface and the graphene-based films. Thermal characterisation showed a capacity for effective heat removal, which was indicated by the decrease in the hot spot temperature at the same power loading. In summary, this facile approach may technologically enable large-scale fabrication of graphene-based films for thermal management in high power density devices.
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98.
  • Zhao, Changhong, 1982, et al. (författare)
  • Synthesis of graphene quantum dots and their applications in drug delivery
  • 2020
  • Ingår i: Journal of Nanobiotechnology. - 1477-3155. ; 18:1
  • Forskningsöversikt (refereegranskat)abstract
    • This review focuses on the recent advances in the synthesis of graphene quantum dots (GQDs) and their applications in drug delivery. To give a brief understanding about the preparation of GQDs, recent advances in methods of GQDs synthesis are first presented. Afterwards, various drug delivery-release modes of GQDs-based drug delivery systems such as EPR-pH delivery-release mode, ligand-pH delivery-release mode, EPR-Photothermal delivery-Release mode, and Core/Shell-photothermal/magnetic thermal delivery-release mode are reviewed. Finally, the current challenges and the prospective application of GQDs in drug delivery are discussed.[Figure not available: see fulltext.]
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