Ghosh, Sourav and Kundu, Sukanya and Das, Rituparna and Naskar, Milan Kanti (2020) Investigating the role of amides on the textural and optical properties of mesoporous-nanostructured theta-Al2O3. Bulletin of Materials Science, 43 (1). Art No-15. ISSN 0250-4707

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Mesoporous-nanostructured theta-Al2O3 was synthesized by an autoclaving technique using different amides i.e., formamide (F), dimethyl formamide (DMF) and diethyl formamide (DEF) at 150 degrees C/24 h followed by calcination at 1000 degrees C. Crystallization and structural behaviour of the as-synthesized materials were characterized by X-ray diffraction and Fourier transform infrared spectroscopy. The porosity study was carried out by N-2 adsorption-desorption (BET) technique. Microstructural features were measured by transmission electron microscopy (TEM). The amide-based solvents played a deliberate role in microstructural and textural features of theta-Al2O3. The DMF-based solvent showed an enhanced surface area of 158 m(2) g(-1). The as-prepared theta-Al2O3 rendered a nano-sheet, nano-rod and nano-flake like morphology for F, DMF and DEF derived products, respectively. From the UV-Vis spectroscopic measurement, the estimated band-gap of theta-Al2O3 was found to be 5.16-5.40eV. Photoluminescence investigation further revealed blue emission particularly for excitation at a wavelength of 252 nm. A DMF-derived sample rendered the lowest band gap due to its smaller crystallite size and higher surface area compared to that of F- and DEF-derived samples.

Item Type: Article
Subjects: Engineering Materials
Depositing User: Bidhan Chaudhuri
Date Deposited: 08 Feb 2021 10:22
Last Modified: 08 Feb 2021 10:22

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