4.6 Article

Nanoarchitectural Evolution from Laser-Produced Colloidal Solution: Growth of Various Complex Cadmium Hydroxide Architectures from Simple Particles

Journal

JOURNAL OF PHYSICAL CHEMISTRY C
Volume 114, Issue 20, Pages 9277-9289

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/jp1018907

Keywords

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Funding

  1. CSIR, New Delhi [09/001/(0303)/2008/EMR-I]

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Complex nanostructures and nanoassemblies have exhibited their potential application in the fabrication of future molecular machines and molecular devices. Liquid phase pulsed laser ablation (LP-PLA) is an easy, versatile, environmentally friendly, and rapidly growing method for the synthesis of nanostructured materials. Several experimental laser and liquid media parameters have been developed, but others are under development. The interaction of an anionic surfactant with the nanomaterials having a positive surface charge density is a key parameter, but an unanswered question until now, in the field of LP-PLA. Nanosecond pulsed laser ablation of a cadmium rod placed on the bottom of a glass vessel containing aqueous media of sodium dodecyl sulfate at different concentrations is used to produce a variety of cadmium hydroxide nanostructures from nanoparticles to nanorods, nanotetrapods, nanoflower buds, and 2D and 3D nanoflowers in order to investigate the above liquid media parameter. It is suggested that initially produced spherical nanoparticles get self-assembled into ID nanorods, which themselves also get assembled into their successor nanoarchitectures. An aqueous medium of 20 mM SDS is found most suitable for the growth of such nanostructures. An increase of the surfactant concentration induces the synthesis of higher aspect ratio ID nanorods with a larger tendency of aggregation and agglomeration. The rate of increase of agglomeration and aggregation with the surfactant concentration is so high that the nanomaterials produced in 100 mM surfactant concentration lose their individual identity. A detailed investigation on the evolution, growth, and self-assembly of various nanostructures is presented.

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