Design of 0D Nanoparticles-2D TMDCs Hybrid Nanostructures for High-Performance Optical and Gas-Sensing Applications
Shin-Yi Tang1*, Teng-Yu Su1, Tzu-Yi Yang1, Yu-Ze Chen2, Yu-Lun Chueh1
1Department of Material Science and Engineering, National Tsing Hua University, Hsinchu, Taiwan
2Department of Material Science and Engineering, National Cheng Kung University, Tainan, Taiwan
* Presenter:Shin-Yi Tang,
Transition metal dichalcogenides (TMDCs) have recently attracted tremendous attention due to their unique optical and electrical properties, possessing great potential in sensing, optoelectronic, energy harvesting and Li-ion battery applications. Although previous studies have demonstrated the sensing applications of TMDCs, still some drawbacks such as limited light adsorption for photodetectors and relatively long response/recovery time for gas sensors remained to be improved. Therefore, in this research, we have reported that by hybridizing 0D nanoparticles or colloidal quantum dots and creating different nanostructures or heterostructures, the performance of TMDC-based sensor devices can be significantly promoted. First, highly absorptive CuInS₂ (CIS) nanocrystals decorated with noble metal (Pt and Au) nanoparticles as the photosensitizer are utilized to enhance the intrinsic absorptivity and promote the performance of bilayer MoS₂-based photodetectors. In addition, the combination of colloidal core/shell quantum dots (CdSe/ZnS and CdS/ZnS) and WS₂ nanowall structure is able to enhanced both optical sensing and gas molecule sensing properties due to the high efficiency of non-radiative energy transfer and the generation of local p-n junctions in the hybrid system. The design of these 0D-2D TMDCs hetero-nanostructure reveals the future potential of multifunctional TMDC-based sensors in advanced applications.

Keywords: transition metal dichalcogenides, 0D nanoparticles, colloidal quantum dot, photodetector, gas sensor