Si nanowire (growing nanowire) in lab by e-beam evaporation

ZnO nanostrcutrues on cotton cloth

ZnO Nano seaurchin grown on cotton cloth shows antibacterial properties

Effect of oxygen partial pressure on the growth zinc micro and nanostructures

ZnO nanoneedles have been synthesized on glass substrates at room temperature by activated reactive evaporation. Neither a catalyst nor a template is employed in this synthesis. High-resolution transmission electron microscopy studies show that the ZnO nanoneedles are single crystalline in nature and that they grow along the [002] direction. We have investigated the effect of the surface roughness of the substrates on the morphology of the grown nanoneedles. This result suggests that the nanoneedles nucleate and grow in the gas phase rather than on the substrate by vapor-solid mechanism. These gas - phase grown nanoneedles are carried continuously by the flowing oxygen gas and are deposited as nanostructured films on the substrates kept at room temperature. Optical studies by Raman spectroscopy reveal that these nanoneedles are oxygen deficient in nature.

Room temperature synthesis of ZnO nanoneedles by activated reactive evaporation

ZnO nanoneedles have been synthesized on glass substrates at room temperature by activated reactive evaporation. Neither a catalyst nor a template is employed in this synthesis. High-resolution transmission electron microscopy studies show that the ZnO nanoneedles are single crystalline in nature and that they grow along the [002] direction. We have investigated the effect of the surface roughness of the substrates on the morphology of the grown nanoneedles. This result suggests that the nanoneedles nucleate and grow in the gas phase rather than on the substrate by vapor-solid mechanism. These gas - phase grown nanoneedles are carried continuously by the flowing oxygen gas and are deposited as nanostructured films on the substrates kept at room temperature. Optical studies by Raman spectroscopy reveal that these nanoneedles are oxygen deficient in nature.

ZnO nanoneedles on flexible polymer substrates

ZnO nanoneedles were successfully deposited on flexible polymer substrates at room temperature by activated reactive evaporation of pure zinc. Neither catalyst nor high substrate temperature was used in this synthesis. These synthesized needles measured 500 – 600 nm in length and its diameter varied from 30 to 15 nm. The single-crystalline nature of the nanoneedles was revealed by high resolution transmission electron microscopy. Raman studies on these nanoneedles had shown they are oxygen deficient in nature. We have proposed a gas phase formation mechanism to explain the growth of these nanoneedles. These ZnO nanoneedles were nucleated and grown in the gas phase by vapor solid mechanism.

Selective growth of ZnO nanoneedles

Zinc film containing hexagonal platestack and tower-like microstructures were grown on Si substrates at high temperature by thermal evaporation. Thermal oxidation studies on these microstructures have shown that, ZnO nanoneedles selectively grow from the facets of the zinc microstructure at temperature above 300^oC in atmosphere. TEM analysis showed that single crystalline and bicrystalline nanoneedles were formed in this oxidation process and the growth direction of these nanoneedles was identified to be along the [11 122"> 0]. Based on the structural studies and morphological observation, we have proposed a possible mechanism for the selective growth of ZnO nanoneedles during thermal oxidation.