Abstract
Mesoporous-nanostructured \(\uptheta \)-\(\hbox {Al}_{{2}}\hbox {O}_{{3}}\) was synthesized by an autoclaving technique using different amides i.e., formamide (F), dimethyl formamide (DMF) and diethyl formamide (DEF) at \(150^{\circ }\hbox {C}/24\,\hbox {h}\) followed by calcination at \(1000^{\circ }\hbox {C}\). 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 \(\hbox {N}_{{2}}\) 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 \(\uptheta \)-\(\hbox {Al}_{{2}}\hbox {O}_{{3}}\). The DMF-based solvent showed an enhanced surface area of \(158\,\hbox {m}^{2}\,\hbox {g}^{-1}\). The as-prepared \(\uptheta \)-\(\hbox {Al}_{{2}}\hbox {O}_{{3}}\) 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 \(\uptheta \)-\(\hbox {Al}_{{2}}\hbox {O}_{{3}}\) was found to be 5.16–5.40 eV. 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.
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Acknowledgements
RD is thankful to UGC and SG is thankful to DST-SERB for providing National Postdoctoral Fellowship with project no. PDF/2017/001728. SK is thankful to Academy of Scientific and Innovative Research (AcSIR).
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Ghosh, S., Kundu, S., Das, R. et al. Investigating the role of amides on the textural and optical properties of mesoporous-nanostructured \(\uptheta \)-\(\hbox {Al}_{{2}}\hbox {O}_{{3}}\). Bull Mater Sci 43, 15 (2020). https://doi.org/10.1007/s12034-019-1989-8
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DOI: https://doi.org/10.1007/s12034-019-1989-8