Preparation Of Two-dimensional Transition-metal Dichalcogenides And Its Photothermal Antibacterial Property Research

As inorganic analogues of graphene, two-dimensional（2D） transition metal dichalcogenides（TMDCs） have attracted great attention from researchers from all over the world in recent years. When bulk TMDC materials are exfoliated to form ultrathin nanosheets（NSs）, their electronic structure changes significantly. The ultrathin 2D structure renders the TMDCs with unique electronic, optical, chemical, and catalytic properties which has opened up a large number of opportunities for novel applications, such as solar cells, hydrogen evolution catalysts, lithium batteries, biosensors, and so on.Various methods have been developed to prepare ultrathin TMDCs NSs. Compared with the other methods, chemical exfoliation is a simple and versatile method to prepare single-layer TMDC NSs. One troublesome issue with this method is that the lithium intercalation rate is low and often needs more than 48 hours or a high temperature to complete the reaction. In this communication, we report an method to sovle the problem and explore a novel application of TMDCs NSs. This thesis is divided into the following three parts:1. Ultrasonication has been used to enhance lithium intercalation method to prepare single-layer MoS₂ NSs with high yield and short time, and investigate the possible reaction mechanism.2. We have taken advantage of the ultrasonication enhanced lithium intercalation（ULI） method to prepare the other single-layer TMDC NSs, and demonstrated the versatility of the method.3. We have showed that nanoscale TMDC can absorb antibacterial antibodies through physical interactions. Furthermore, the adsorbed antibody retains its activity in recognizing bacteria. In the presence of NIR irradiation, antibody-TMDC complex can selectively kill bacteria through photothermal lysis.