Quantitative characterisation of nanomaterials using novel low-energy electron spectromicroscopy.

在纳米尺度上设计以产生新的和独特的性能的新型材料，在从下一代电子和磁性设备到新的医疗和治疗应用的广泛的未来应用中都需要。在将这些材料应用于新的应用之前，需要对这些材料进行表征，这是对其进行基准测试和了解新特性的基本要求。由于固体中低能电子的非弹性平均自由程较短(~几纳米)，利用这种纳米结构材料的低能(&lt；200 eV)电子相互作用和发射具有临界值。该博士项目将使用并进一步开发一种基于场发射的新型低能无透镜扫描电子显微镜，结合York的新型低能电子能量分析仪(Bessel Box)来对纳米结构材料的低能电子发射进行成像和量化。对发射的充分理解受到模拟方法的限制，这些方法目前不能准确地模拟低能电子在固体中的输运和产生。该项目将致力于解决这一问题，并开发更准确的固体低能电子发射模型，该模型可以作为实验测量的基准。

Novel materials, engineered on the nanoscale to generate new and unique properties, are required in a wide range of future applications from next generation electronic and magnetic devices to novel medical and therapeutic applications. The need to characterise these materials is an essential requirement in benchmarking and understanding the new properties prior to implementing in new applications. The use of low energy (<200 eV) electron interactions and emission from such nano-structure materials is of critical value because of the short inelastic mean free path (~ few nanometres) of low energy electrons in solids. This PhD project will use and further develop a novel low-energy lensless scanning electron microscope based on field emission combined with York's novel low-energy electron energy analyser (Bessel box) to image and quantify low-energy electron emission from nano-structure materials. The full understanding of the emission is limited by simulation methods which currently do not accurately model low-energy electron transport and generation in solids. This project will aim to address this and develop more accurate modelling of low energy electron emission from solids, which can be benchmarked against the experimental measurements..