School Of Basic And Applied Sciences
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Item Natural Basil as Photosensitizer with ZnO Thin Films for Solar Cell Applications(Taylor and Francis Ltd, 2020) Shiyani, T; Mahapatra, S.K; Banerjee, I.The hybrid solar cell has been fabricated using natural dye extracted from basil or ocimum leaves and ZnO thin film. The extracted natural dye was deposited on ZnO thin films and dried at room temperature. The semiconductor layer of ZnO was fabricated on FTO-coated glass substrate using magnetron sputtering with a thickness of 500 nm. A photocathode was prepared from the Au�Pd mixture using sputtering for a top electrode. ZnO has been confirmed using X-ray diffraction and UV�visible absorption spectroscopy measurements. The photovoltaic characteristics of the prepared DSSCs were studied by measuring the I�V characteristics under the illumination of halogen light. Photocurrent and photovoltage both are increased in the cell. The value of short-circuit current (Isc), open-circuit voltage (Voc), and photon energy conversion efficiency (?) were calculated for a dye-sensitized solar cell (DSSC). DSSCs provide the promising light to electrical energy conversion efficiency due to their low-cost fabrication, environmentally friendly elements, and low maintenance. DSSC offers transparent solar cell modules with the capabilities of the use of hybrid composition such as organic and inorganic materials. The basil/ZnO-based hybrid devices can also be useful for photoelectrochemical cell and water splitting applications. � 2020, � 2020 IETE.Item Surface-engineered gadolinium oxide nanorods and nanocuboids for bioimaging(University of Science and Technology Beijing, 2020) Chawda, N.R; Mahapatra, S.K; Banerjee, I.Abstract: Folic acid and D-gluconic acid-capped gadolinium oxide nanorods and nanocuboids were synthesized via co-precipitation method. Comparative study of relaxivity factor on the role of capping and morphology for enhancing contrast ability for T1 and T2 magnetic resonance imaging (MRI) was investigated. The obtained r2/r1 ratio for folic acid and D-gluconic acid-capped gadolinium oxide nanorods and nanocuboids was 1.5 and 1.3, respectively. The nanocrystals were characterized and presented with properties such as good dispersity and stability required for standard contrast agent used in MRI. The characterization and the analysis of capping agent for nanocrystals suggest the preferable use of carbohydrate moieties with higher number of hydroxyl functional group reacted with urea and hydrogen peroxide for desired morphology and anisotropic growth. Thermogravimetric�differential thermal analysis (TG�DTA) illustrated the amount of capping, transition temperature from Gd(OH)3 to GdOOH and crystallization temperature from GdOOH to Gd2O3. These nanocrystals would be significant for other biomedical applications such as drug delivery when equipped with well-functionalized drug molecules. Graphic abstract: Synergistic effects and mechanism of urea, hydrogen peroxide and capping agent for growth and morphology. [Figure not available: see fulltext.] � 2020, The Nonferrous Metals Society of China and Springer-Verlag GmbH Germany, part of Springer Nature.