School of Science Department of Chemistry 2 Department of Chemistry Lead-free Perovskite Nanocrystals for Photo-induced Water Splitting Supervisor: HALPERT Jonathan Eugene / CHEM Student: LEE Yan Yee / CHEM-IRE Course: UROP 2100, Fall In recent years, numerous methods have been gradually developed to create hydrogen (H2) from water when exposed to sun radiation. This fuel manufacturing method is environmentally benign, clean, and may even be economical. Currently, however, the high cost, limited photoresponse, and inadequate catalytic performance of existing technologies make them unsuitable for meeting industrial needs. CdS is regarded as an intriguing and significant material among water splitting photocatalysts because of its inexpensive cost, strong catalytic activity, and high absorption in the visible spectrum. This report focuses on the synthesis of CdS and MoS2/CdS nanocomposites and their subsequent analysis using X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) and EDX. The objective of this study is to investigate the structural and morphological properties of these materials in preparation for future assessment of their photocatalytic activity. The integration of MoS2 with CdS aims to enhance the photocatalytic efficiency, making these nanocomposites promising candidates for various applications in energy conversion and environmental remediation. Single Molecule Manipulation and Characterization of Biomolecules Supervisor: HUANG Jinqing / CHEM Student: GUO Yichen / CHEM Course: UROP 1000, Summer The study of the mechanism of λ-DNA and drug interactions using Optical Tweezer has been conducted in this study. Double stranded λ-DNA were pulled under a constant velocity in 100 μM drug solution. The drug and DNA interactions was tracked through the change in the shape of the Force distance plot in drug compared to the graph in buffer. With the difference between distance of the bare DNA and drug interacted DNA taken, possible binding intercalations results in longer DNA contour length gives information to characterize the feature of different drugs interactions as easy intercalated or force induced interaction favoured. The size of sterically bulky ligands on the drug complex prohibits the insertion to bind with DNA when base pairs are broken under the applied force. The metal centre of the complex is also a factor that drives the amount of intercalation to react with drug, more positively charged metal center will have a higher affinity to interact with negatively charged DNA. The size control of ligands in drug synthesis is important to optimized with the separation distance between DNA base pairs to interact in expected time or distance under zero force for better selectivity.
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