I am working on ZnO nanorods synthesis through hydrothermal method. In literature the common precursors are used for all the nanostructures of ZnO. My question is that why nanorods are formed rather then other nanostructures... Which thing is necessary for the controlling of the alligment(orientation) of ZnO nanorods in hydrothermal method
Dear Abdus,
The two main parameters that control the growth rate is the temperature gradient and the supersaturation of the solution. The direction of the temperature gradient determines the direction of the growth. For vertical growth you have to see for a vertical temperature gradient or vertical supersaturation gradient.
The shape of the grown crystal say rod structure depends on the formed seeds. Seeds must be of orientation to promote the growth in the vertical direction. The orientation and the temperature of the substrate also affects the orientation of the seeds.
Best wishes
Hii, you can find the answer in the following link.
https://www.researchgate.net/post/How_is_the_nanorods_structure_formed_in_hydrothermal_method
Dear Abdus,
The two main parameters that control the growth rate is the temperature gradient and the supersaturation of the solution. The direction of the temperature gradient determines the direction of the growth. For vertical growth you have to see for a vertical temperature gradient or vertical supersaturation gradient.
The shape of the grown crystal say rod structure depends on the formed seeds. Seeds must be of orientation to promote the growth in the vertical direction. The orientation and the temperature of the substrate also affects the orientation of the seeds.
Best wishes
Hi,
The growth of ZnO nanorod occurs due to presence of hexamethylenetetramine (HMT), the Zn & O bonding begins to a defined value ‘a, b and c’ i. e crystallization. The affinity between the Zn and oxygen causes to shape the crystal in hexagonal and thus the voids around it are created. Further, with time the ZnO growth is possible over the existing ZnO hexagonal only rather than spreading itself in the void space (to make nanosheet kind structure). Here basically, the linking of two ZnO units is possible vertically only. The hexagonal shape formation is due to HMT (a fundamental structure is hexagonal).
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