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Updated: Jun 25, 2026
Synthesis and Characterization of Supramolecular Colloids
Published on: April 22, 2016
Silica encapsulated CdS tabular nanocomposites via a template directed agglomeration mechanism
Jun Wang1, Stephen J Sollenberger, Ying Yuan
1NSF Particulate Materials Center Materials Research Institute and Department of Materials Science and Engineering, The Pennsylvania State University, University Park, PA 16802, USA.
Abstract:
Silica coated CdS tabular nanocomposites were synthesized through precipitation of CdS nanoparticles in octylamine/water bilayer system followed by in situ hydrolysis of tetraethoxylsilicate (TEOS) precursor. Face diameter of the nanoplatelets was in the range of 50-250 nm with a variable thickness (3 to 25 nm) dictated by octylamine content or R ratio ([water]/[octylamine]). A uniform SiO2 outer shell of about 15 nm was observed regardless of the size of the high aspect ratio CdS nanoplatelets, which appeared to be agglomerated primarily owing to the confined bilayer template. Morphology and microstructure of the CdS/SiO2 tabular nanocomposites were characterized using atomic force microscope (AFM) and high resolution transmission electron microscope (HRTEM). A noticeable enhancement in absorbance for the UV-vis spectra was observed due to the SiO2 coating layer. Growth mechanism of nanocomposite platelets and potential applications associated with this anisotropic nanocomposite are discussed.
