Browsing by Author "Dahiya S."

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    Enhancement in photo-response of CuZnS nanocrystals-based photodetector using asymmetric work function electrodes
    (Elsevier B.V., 2024) Dahiya S.; Hazra S.; Pandey U.; Pramanik S.; Dahiya P.; Singh S.V.; Kumari N.; Pal B.N.
    In this study, an efficient visible light photodetector has been fabricated by using heavy metal-free CuZnS Nanocrystals with average particle size of 13 � 1 nm and has been synthesized by a microwave (MW) assisted synthesis technique. The optical band gap of this nanocrytstal is ?1.7 eV and has an absorbance spectra ranging from 300 to700 nm. This low bandgap nanocrystals has been used to fabricate a photoconductor device with a CuZnS/ZnO bilayer structure. Besides, the device performance has been enhanced by using an asymmetric work-function lateral electrodes. The work-function difference between the electrodes gives a driven voltage between the electrodes, which allows faster collection of charge carriers from the device. As a consequence, a significant photocurrent is generated by the device even without any external bias. The self-biased (at 0 V) external quantum efficiency (EQE) of this device is ? 4 % (at 430 nm) whereas this value reaches ? 20 % under 2 V external bias. The device possesses the responsivity (R?) and detectivity (D) of 8.8 A/W and 3.8 � 1012 Jones at 320 nm respectively under 2 V external bias. � 2024 Elsevier B.V.
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    Functionalized jute with high-water absorption, low thermal conductivity and efficient radiative cooling for the preservation of perishable green vegetables with reduced cold storage energy requirements
    (Royal Society of Chemistry, 2024) Bhatt S.B.; Ranjan R.; Dahiya S.; Pal B.N.; Dhar P.
    Jute bags, traditionally used for storing fruits, vegetables and cereals, lack temperature resilience and catch fire, making the contents inside the bag vulnerable to deterioration. In this study, normal jute fibres (NJFs) were strategically modified via a delignification-cum-phosphorylation route to produce phosphorylated jute fibres (PJFs) using low-cost agro-based chemicals. PJFs exhibit a high water absorption capacity and a lower evaporation rate with prolonged moisture retention capabilities. Interestingly, PJFs also show an ultra-low thermal conductivity of 0.076-0.078 W m?1 K?1, slow rate of burning (0.058 cm s?1), high reflectance to light in the IR region (76%) and high thermal stability. PJF bags used for the storage of perishable vegetables, such as coriander leaves, show an extension in shelf life by ?2 days, along with flame resistance to heat-sensitive vegetables such as chilies on exposure to high temperature. Life cycle assessment (LCA) shows that the production of PJFs generates 49.4% less global warming potential impact as compared to PET production with improved biodegradation within ?21 days. Further, the utilization of PJFs reduced the time for cold storage of coriander leaves to 8 days, which led to reduced energy requirements and lowered environmental impacts by 11% in the terrestrial ecotoxicity and climate change category. The present study provides a strategic, scalable and green route for the production of functionalized jute bags required for the storage of perishable agricultural harvests, reducing global issues associated with food loss and improving human health and the economy. � 2024 The Royal Society of Chemistry.