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物理系学术报告-Photoluminescent and Electrochemical Active Transition Metal Oxide Nanomaterials

发布时间:2013-07-01 14:38:58 

主讲人:Yuanbing Mao, Ph.D.(University of Texas-Pan American)

报告时间:下午1:30-3:30

报告地点:大连海事大学数理楼224会议室

内容提要:

摘要:
The exploration of novel functional materials over a wide range of experimental conditions is at the core of fulfilling the goal of accessing their unique properties and innovative applications. In this presentation, an overview on synthetic methodologies as means of controlling chemical composition, morphology and crystallographic phase of advanced materials, mainly nanostructured transition metal oxides, will be first given. Two types of functional materials, i.e. photoluminescent and electrochemical active nanomaterials, will then be discussed. For example, to understand and fine tune optical properties of luminescent materials, a kinetically modified molten salt synthetic method was developed to make rare-earth doped lanthanum zirconate nanocrystals. These nanocrystals possess a fluorescence quenching concentration as high as 30% of europium dopant. A successful procedure for surface coating of these crystals was developed to further increase their luminescence. For electrochemical energy storage, manganese oxide nanoflowers were designed to enable enhanced electrochemical performance as asymmetric supercapacitors with high power and energy densities and long cyclability. We also designed and synthesized three-dimensional ZnO@MnO2 core@shell nanoforests with higher areal capacitance (5 times), better rate performance and smaller inner resistance than their nanowire array counterpart for miniaturized energy storage devices. In sum, advanced inorganic materials offer bright promise of producing innovative advances across multiple technologies, and thus will continue impacting our lives in substantial ways.

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物理系