School of Engineering Department of Chemical and Biological Engineering 83 Optimization of Illumination and Nutrients for Hydroponics System Supervisor: Marshal LIU / CBE Student: KHAN Ekramul Haque / CENG Course: UROP 1000, Summer This study evaluated the effects of red (662 nm) and blue (430 nm) LED light spectra on okra seedling growth in a hydroponic system. In Trial 1, seedlings under blue light showed faster stem elongation (0.738cm/day) compared to red light (0.187cm/day), while red light promoted earlier leaf emergence. Trial 2 compared combined 50% red/50% blue light to 100% blue light, revealing that mixed spectra yielded intermediate growth and leaf development. These findings confirm distinct photomorphogenic roles of red and blue light, with blue enhancing elongation and red stimulating leaf genesis. The results emphasize the importance of spectral composition in optimizing okra growth. Future studies should refine light ratios to maximize growth efficiency and resource use, contributing to improved hydroponic cultivation strategies. Design and Synthesis of Novel Cathode Material for Lithium Sulfur Batteries (LSB) Supervisor: LUO Zhengtang / CBE Student: MAI Van Duc / CHEM Course: UROP 1000, Summer Monolayer molybdenum disulfide (MoS2), a two-dimensional transition metal dichalcogenide, holds immense potential for advanced electronic and optoelectronic devices due to its tunable bandgap and high carrier mobility. The development of high-quality, tunable heterojunctions represents a critical focus for future research. Achieving spatially controlled p-n doping in MoS2 remains a key challenge for realising functional devices such as transistors and photodetectors. This study explores defect-mediated doping by synthesising high-quality monolayer MoS2 using Chemical Vapour Deposition (CVD) with ammonium heptamolybdate (AHM) and sulfur powder as precursors, followed by the introduction of sulfur vacancies through laser irradiation. The CVD process enables the growth of uniform MoS2 films, while laser irradiation offers a precise method to create localised defects that influence the material’s electronic properties. Preliminary results demonstrate the successful synthesis of monolayer MoS2 and the formation of sulfur vacancies, paving the way for controlled doping strategies. This work highlights the potential of combining scalable synthesis with defect engineering to achieve tailored electronic properties in MoS2, advancing its application in next-generation nanotechnology.
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