Flame Synthesis of Metal-Oxide/Carbide Nanowires

CBET-0755615 Tse本研究的目的是探索和建立火焰合成条件与纳米线生长行为之间的关系。 它将从假设工作，对于一个给定的衬底材料，生长速率，晶体结构，和纳米线的形态，如线与带是由当地的气相温度，衬底温度，和气相物种。 在以前的工作中，PI开发了一种新的基于燃烧的技术，在大气条件下以高速率直接从微米级金属颗粒合成单晶氧化物和碳化物纳米线。目前的研究将结合联合收割机经验表征不同的火焰合成纳米线的步骤，以实现其形成的基本理解。大量的金属氧化物/碳化物纳米线将合成使用逆流扩散火焰和插入探针基板特征的激光诊断。 氧化物和碳化物的合成将被研究的三个基本金属铝，铁，和钨。 在过去的五年中，基于功能氧化物的一维纳米结构的研究引起了相当大的关注，由于其独特的和创新的应用在光学，光电子学，催化和压电。半导体氧化物纳米线构成了一组特殊的一维纳米材料，其具有独特且均匀的几何形状、受控的晶体学和表面结构、环境哈代和稳定的表面以及无位错的单晶体积。基于这些纳米结构，包括场效应晶体管、超灵敏纳米尺寸气体传感器、纳米谐振器和纳米悬臂梁在内的各种应用变得可实现。 除了这些潜在的技术影响，通过对研究生研究人员的教育以及将这项工作纳入纳米材料和高级诊断课程，拟议工作产生了更广泛的影响。这项工作还将进一步促进正在进行的行业合作伙伴关系，并将允许学生访问行业设施和合作机会。

CBET-0755615TseThe goal is this research is to explore and establish the relationship between flame-synthesis conditions and growth behavior of nanowires. It will work from the hypothesis that for a given substrate material, growth-rate, crystal structure, and nanowire morphologies such as wires vs. ribbons are determined by the local gas-phase temperature, substrate temperature, and gas-phase species. In previous work, the PI has developed a novel combustion-based technique to synthesize monocrystalline oxide and carbide nanowires directly from microsized metal grains at high rates under atmospheric conditions. The present research would combine empirical characterization of different flame-synthesized nanowires with steps to achieve fundamental understanding of their formation. A large number of metal oxide/carbide nanowires will be synthesized using using a counter-flow diffusion flame and an inserted probe substrate characterized laser-based diagnostics. Oxide and carbide synthesis will be investigated for the three base metals Al, Fe, and W. Over the past half-decade, research in functional oxide-based one-dimensional nanostructures has attracted considerable attention due to their unique and innovative applications in optics, optoelectronics, catalysis, and piezoelectricity. Semiconducting oxide nanowires constitute a special set of 1D nanomaterials that have a distinct and uniform geometrical shape, a controlled crystallographic and surface structure, environmentally hardy and stable surfaces, and a dislocation-free single-crystal volume. A variety of applications including field-effect transistors, ultra-sensitive nano-size gas sensors, nanoresonators, and nanocantilevers become realizable based on these nanostructures. Beyond these potential technological impacts, broader impacts of the proposed work arise through education of the graduate researchers and incorporation of this work into nanomaterials and advanced diagnostics courses. The work will also further ongoing industry partnerships and will allow students access to industry facilities and opportunities for collaboration.