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Cheung C.H.,Hong Kong Baptist University | Song W.J.,CAS Ningbo Institute of Material Technology and Engineering | So S.K.,Hong Kong Baptist University
Organic Electronics: physics, materials, applications | Year: 2010

Oxygen or air exposure to transition metal oxides (TMOs) was demonstrated to be essential in improving the hole injection (HI) efficiency at the contact formed by TMOs and small organic hole transporter. Current-voltage (J-V) and dark-injection space-charge-limited current (DI-SCLC) techniques were used to cross-examine the TMO/organic contacts. The hole transporter under investigation was N,N′-diphenyl-N,N′-bis(1-naphthyl)(1,1′biphenyl)-4,4′diamine (NPB). The improvement was attributed to the reduction in the energy barrier at TMO/NPB interface, which was a consequence of the work function enhancement of TMO by the oxidation of oxygen in air. © 2009 Elsevier B.V. All rights reserved. Source


Liu Z.,CAS Ningbo Institute of Material Technology and Engineering | Zhou X.,CAS Ningbo Institute of Material Technology and Engineering | Qian Y.,Anhui University of Science and Technology
Advanced Materials | Year: 2010

Carbon nanomaterials have advanced rapidly over the last two decades and are among the most promising materials that have already changed and will keep on changing human life. Development of synthetic methodologies for these materials, therefore, has been one of the most important subjects of carbon nanoscience and nanotechnology, and forms the basis for investigating the physicochemical properties and applications of carbon nanomaterials. In this Research News article, several synthetic strategies, including solvothermal reduction, solvothermal pyrolysis, hydrothermal carbonization, and soft-chemical exfoliation are specifically discussed and highlighted, which have been developed for the synthesis of novel carbon nanomaterials over the last decade. © 2010 WILEY-VCH Verlag GmbH & Co. KGaA,. Source


Zhou X.,CAS Ningbo Institute of Material Technology and Engineering | Wang F.,Brookhaven National Laboratory | Zhu Y.,Brookhaven National Laboratory | Liu Z.,CAS Ningbo Institute of Material Technology and Engineering
Journal of Materials Chemistry | Year: 2011

Graphene-modified LiFePO4 composite has been developed as a Li-ion battery cathode material with excellent high-rate capability and cycling stability. The composite was prepared with LiFePO4 nanoparticles and graphene oxide nanosheets by spray-drying and annealing processes. The LiFePO4 primary nanoparticles embedded in micro-sized spherical secondary particles were wrapped homogeneously and loosely with a graphene 3D network. Such a special nanostructure facilitated electron migration throughout the secondary particles, while the presence of abundant voids between the LiFePO4 nanoparticles and graphene sheets was beneficial for Li + diffusion. The composite cathode material could deliver a capacity of 70 mAh g-1 at 60C discharge rate and showed a capacity decay rate of <15% when cycled under 10C charging and 20C discharging for 1000 times. © 2011 The Royal Society of Chemistry. Source


Zhou X.,CAS Ningbo Institute of Material Technology and Engineering | Liu Z.,CAS Ningbo Institute of Material Technology and Engineering
Chemical Communications | Year: 2010

High yield production of graphene oxide and graphene sheets with an ultralarge size (up to ∼200 μm) was realized using a modified solution-phase method. © 2010 The Royal Society of Chemistry. Source


Shen B.,CAS Ningbo Institute of Material Technology and Engineering | Zhai W.,CAS Ningbo Institute of Material Technology and Engineering | Zheng W.,CAS Ningbo Institute of Material Technology and Engineering
Advanced Functional Materials | Year: 2014

As the portable device hardware has been increasing at a noticeable rate, ultrathin thermal conducting materials (TCMs) with the combination of high thermal conductivity and excellent electromagnetic interface (EMI) shielding performance, which are used to efficiently dissipate heat and minimize EMI problems generated from electronic components (such as high speed processors), are urgently needed. In this work, graphene oxide (GO) films are fabricated by direct evaporation of GO suspension under mild heating, and ultrathin graphite-like graphene films are produced by graphitizing GO films. Further investigation demonstrates that the resulting graphene film with only ≈8.4 μm in thickness not only possesses excellent EMI shielding effectiveness of ≈20 dB and high in-plane thermal conductivity of ≈1100 W m-1 K-1, but also shows excellent mechanical flexibility and structure integrity during bending, indicating that the graphitization of GO film could be considered as a new alternative way to produce excellent TCMs with efficient EMI shielding. The graphitization of graphene oxide films can lead to the formation of graphite-like graphene films, which not only display a remarkable combination of excellent electromagnetic interface (EMI) shielding effectiveness and high in-plane thermal conductivity, but also show excellent mechanical flexibility, indicating a novel promising candidate for excellent thermal conducting materials with efficient EMI shielding. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source

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