Baruah, Sunandan and Dutta, Joydeep (2009) Effect of seeded substrates on hydrothermally grown ZnO nanorods. J Sol-Gel Sci Technol (2009) . pp. 456-464. ISSN 0928-0707 (print),1573-4846 (electronic)
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We report a study on the effect of seeding on glass substrates with zinc oxide nanocrystallites towards the hydrothermal growth of ZnO nanorods from a zinc nitrate hexahydrate and hexamethylenetetramine solution at 95 C. The seeding was done with pre-synthesized ZnO nanoparticles in isopropanol with diameters of about 6–7 nm as well as the direct growth of ZnO nanocrystal-lites on the substrates by the hydrolysis of pre-deposited zinc acetate ﬁlm. The nanorods grown on ZnO nanoparticle seeds show uniform dimensions throughout the substrate but were not homogenously aligned vertically from the substrate and appeared like nanoﬂowers with nanorod petals. Nanorods grown from the crystallites formed in situ on the substrates displayed wide variations in dimension depending upon the preheating and annealing conditions. Annealing the seed crystals below 350 °C led to scattered growth directions whereupon preferential orientation of the nanorods perpendicular to the substrates was observed. High surface to volume ratio which is vital for gas sensing applications can be achieved by this simple hydrothermal growth of nanorods and the rod height and rod morphology can be controlled through the growth parameters.
|Uncontrolled Keywords:||ZnO • Nanorods • Hydrothermal • Seeding • Crystallization • Sensing|
|Subjects:||Material Science > Functional and hybrid materials|
|Deposited On:||30 Sep 2009 09:12|
|Last Modified:||30 Sep 2009 09:12|
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