电化学2H/1T晶相调控下二硫化钼微波吸收特性研究

近年来，二硫化钼因其丰富的理化特性在介电微波吸收领域展现出巨大的应用潜力。区别于目前广泛报道的异质构筑/复合策略，针对二硫化钼开展新型、优质的介电调控机制一直是该领域的研究难点。电化学调控是近年来广泛采用的一种优化/改变材料微结构的有效策略，其具有调控精准、操作简单等优势。本申请拟采用电化学调控2H/1T晶相组成的策略对二硫化钼的介电弛豫行为与微波吸收特性开展研究。首先，通过调控施加于二硫化钼上的化学电位，实现二硫化钼中2H相与1T相的相对含量的线性变化；其次，通过电化学工作站-矢量网络分析仪-形法测试仪的联合，实现二硫化钼2H/1T线性相变过程中微波吸收特性的实时与原位检测。通过本项研究，掌握二硫化钼材料2H/1T相组成含量变化-介电弛豫响应行为-微波吸收特性的构效关系，建立相关介电弛豫损耗与对应微波吸收模型，为电化学晶相调控策略在系列过渡金属硫化物中的应用奠定基础。

In recent years, molybdenum disulfide (MoS2) has shown great potential in the area of dielectric microwave absorption due to its unique physical and chemical properties. Different from the widely adopted heterogeneous or composite construction strategies, developing the innovative and superior dielectric regulation mechanisms toward MoS2 has always attracted tremendous research interests in this field. Electrochemical regulation is an effective strategy to tune the microstructure of absorbers due to the advantages of precise regulation and simple operation. In this study, the electrochemical 2H/1T phase manipulating strategy was employed for exploring the dielectric and microwave absorbing properties of MoS2. First, different 2H/1T phase ratios can be precisely controlled by manipulating the chemical potential upon MoS2. Second, the microwave absorption properties of MoS2 can be in-situ measured during the phase transition processes via the combination of electrochemical workstation, vector network analyzer and the classic arch tester. As a result, the relationship between 2H/1T phase ratios, dielectric relaxation behaviors and microwave consumption could be built rationally, as well as the establishing of corresponding dielectric relaxation loss and microwave attenuation models. Furthermore, the explored mechanisms as mentioned above could also be expanded to other two dimensional transition metal sulfides for further practical applications.