Effect of seeded substrates on hydrothermally grown ZnO nanorods |
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Authors: | Sunandan Baruah and Joydeep Dutta |
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Institution: | (1) Center of Excellence in Nanotechnology, School of Engineering and Technology, Asian Institute of Technology, Pathumthani, 12120, Thailand |
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Abstract: | 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 nanocrystallites 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. |
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Keywords: | ZnO Nanorods Hydrothermal Seeding Crystallization Sensing |
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