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Wu X.,National Engineering Laboratory for TFT LCD Materials and Technologies | Li S.,National Engineering Laboratory for TFT LCD Materials and Technologies | Zhao Y.,Shanghai JiaoTong University | Tang Y.,Shanghai JiaoTong University | And 4 more authors.
ACS Applied Materials and Interfaces | Year: 2014

Highly conductive, uniform, and transparent nitrogen-doped graphene multilayer films were produced by a layer-by-layer (LbL) assembly method. Such a technique was realized by alternate deposition of graphene oxide modified with the cationic surfactant N,N,N-trimethyl-1-dodecanaminium bromide (CTAB) and the anionic surfactant sodium dodecylbenzenesulfonate. In this way, we can achieve a highly conductive (900 S/cm), uniform, and controllable graphene film in terms of thickness, transmittance, and sheet resistance after high-temperature reduction. The improved conductivity is attributed to better graphitization and nitrogen-doping introduced by CTAB. The organic light-emitting diode using such a multilayer graphene film fabricated by the LbL method as an anode obtains higher current density and luminance at low voltage compared to that with an indium-tin oxide (ITO) anode. Moreover, the current efficiency of graphene-based device is comparable to that of an ITO-based device. It is proved that such a nitrogen-doped multilayer graphene film developed by the LbL assembly technique is a promising candidate for a transparent electrode in organic electronics. © 2014 American Chemical Society. Source


Wang D.-Y.,Fudan University | Chang Y.,Fudan University | Lu Q.-S.,Fudan University | Yang Z.-G.,Fudan University | Yang Z.-G.,National Engineering Laboratory for TFT LCD Materials and Technologies
Materials Technology | Year: 2015

A nano-organic silver composite conductive ink has been developed orienting to the flexible electronics. The conductive ink printed on the flexible substrates turned into highly conductive silver metal after sintered at 250°C. Viscosity and surface tension of the conductive ink were 2.3 cps and 26-29 dyne cm-1 respectively. The ink remained stable without condensation or agglomeration during preservation. The resistivity of the conductive film, after annealing, was 11.7 μΩ cm, while the adhesion reached 5B. Transmission electron microscopy (TEM) and scanning electron microscope (SEM) were conducted to observe the morphology of the conductive ink before and after heat treatment, and to help deducing a probable mechanism of the reaction during the synthesis and sintering process. The preparation and characterisation of the composite conductive ink were comprehensively demonstrated in this paper. © 2015 W. S. Maney & Son Ltd. Source


Wang D.-Y.,Fudan University | Chang Y.,Fudan University | Wang Y.-X.,Fudan University | Zhang Q.,Fudan University | And 2 more authors.
Materials Technology | Year: 2016

A green water-based silver nanoplate ink was developed for printed circuit board. The growth of the nanoplates was shown by the colour change of the solution. Silver nanoplates with the side length around 20-40 nm in the ink were identified by transmission electron microscope and X-ray diffractomer. The ink patterned on the flexible substrates (polyimide) turned into conductive pattern after sintered at 300°C for 1 hour. The morphology of the conductive patterns were characterised by scanning electron microscopy. After the sintering process, the resistivity of the conductive ink was 9.43μΩ·cm, while the adhesion to the substrate reached 4 B. Thermal gravity analysis was conducted to deduce the mechanism of the sintering process and the solid content of the ink. The application of the conductive ink was also discussed in this paper. ©2016 Taylor and Francis. Source

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