离子束诱导类石墨烯二维纳米材料性能调控研究

In this project, utilizing ion irradiation technique, microstructure evolution of graphene-like two-dimensional nanomaterials in ionirradiation environment will be studied.Based on ion-irradiation-induced microstructure evolution behavior, the related physical and chemical properties of two-dimensional nanomaterials could be modulated, further improving the performance of nanomaterials and extending their application fields. As an effective material-modification process, the effect of irradiated ion species, energy and dose on lattice damage and irradiation defect behaviors will be comprehensively studied, and then the physical mechanism of ion-irradiation-induced property modulation in two-dimensional nanomaterials will be further discussed. What’s more, owing to the probable doping effect induced by irradiated ion, the formed interstitial or substitutional latticesites may also significantly modify the band gap and energy level of two-dimensional nanomaterials, which will be also discussed in this work. Combining the theory simulation and experiment characterization, the specific mechanism of microstructure evolution and property modulation in graphene-like two-dimensional nanomaterials induced by ion irradiation will be studied in detail, and the objective of this project is to provide the basic understanding of property modulation behavior of nanomaterials utilizing ion beam technique, and also develop the applications of nuclear technique in nanomaterial fields.

本项目拟通过离子辐照二维材料，探讨辐照对其结构影响的演化特征与规律，继而对其性质进行有效调控，有利于该类材料的实际应用。离子辐照作为一种有效的材料改性实验手段，普适性较强，我们主要探讨与寻求合适的离子辐照条件（离子种类、离子能量与剂量）对于晶格结构、缺陷分布等的影响，对材料的性能进行优化与调控。同时注入离子可以作为掺杂元素，深入探讨其在材料中的位置，如间隙空位或占位替代，继而实现对于能级、带隙等的调控。该项目拟采取理论模拟计算与实验相结合的方法，期望对其结构与特性变化机理进行探讨，本项目的研究不仅为二维材料的性能调控以及应用打下基础，还可以拓宽核技术在纳米材料领域的应用。

本项目通过离子辐照二维材料，探讨辐照对其结构影响的演化特征与规律，继而对其性质进行有效调控，主要研究了不同能量和剂量的离子辐照多层二维纳米片样品的结构、层数、厚度及光学性质，对于结构、缺陷分布产生与演化进行了探讨，进行了离子辐照二维材料的离子掺杂替位后对于催化性能的调控以及多层二维材料样品的析氢反应。利用第一性原理和分子动力学进行了辐照损伤的模拟。本项目的研究不仅为二维材料的性能调控以及应用打下基础，还可以拓宽核技术在纳米材料领域的应用。