Oriented zine oxide (ZnO) seed layers were deposited by simple drop casting of zinc acetate dihydrate (ZAD) solution on glass substrates at room temperature followed by a post-heat treatment at 250 oC. X-ray diffraction (XRD) analyses revealed that ZAD solutions with concentration 0.0025 – 0.0100 M produced amorphous type thin films, whereas 0.0200 M ZAD solutions produced ZnO seed layers with a preferential c-axis texturing.The Scanning Electron Microscopy (SEM) analyses evident that the morphology of ZnO seed layer surface is compact and coherently carpets the underlying glass substrate. ZnO nanorods were then grown by hydrothermal method atop the ZnO seeded and non-seeded substrates. The presence of ZnO seeding layers was found to be beneficial for growing ZnO NRs films vertically. The optical bandgap of ZnO seed and ZnO NR were estimated to be in the range of 3.40 – 3.95 eV and 3.20 – 3.25 eV respectively by using UV-VIS-NIR diffuse reflection spectroscopy. The room temperature photoluminescence analyses revealed that nanostructured ZnO films exhibit a sharp near-band-edge luminescence peak at ~380 nm consistent with the estimated optical band gap and the ZnO nanorod arrays are notably free from defect-related green-yellow emission peaks.Bangladesh J. Sci. Ind. Res.53(4), 233-244, 2018
Cane fiber of the generas Acoruscalamus, Daemonorops Draco, Daemonoropsmollis climbing palms of tropical Asia, belonging to the family palmae (palm family) and unsaturated polyester resin were used for the preparation of composites. Cane fiber was modified with 5%, 10%, 15% NaOH solution. Various physical and mechanical properties of the composite for different orientations of fiber were measured. The physical properties i.e. water absorption of treated fiber reinforced composites is lower. But the moisture content of cane fiber decreases with higher concentration of alkali solution used for treatment. The ultimate tensile strength (UTS) is higher for treated fiber reinforced composites than the raw fiber reinforced composites for any types of orientations of fibers and the tensile strain of treated fiber reinforced composites is lower than the raw fiber reinforced composites. The UTS value for treated cane fiber composites increases with increasing weight percentage of fiber than the raw fiber reinforced composite. Bangladesh J. Sci. Ind. Res.54(3), 247-256, 2019
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