Thioalkanoates as Site-Directing Nucleating Centers for the Preparation of Patterns of CdS Nanoparticles within 3-D Crystals and LB Films of Cd Alkanoates

Abstract

A method is described for the preparation of hybrid organic/inorganic structures where the inorganic component comprises semiconductor nanoparticles aligned in periodic layers within three-dimensional (3-D) crystalline powders and Langmuir−Blodgett (LB) films. The preparation process comprises the organization of metal ions in the form of periodic arrays within 3-D crystals or the LB films, followed by a topotactic gas/solid reaction. The method is illustrated for the organization of CdS nanoparticles within alkanoic acids. The order of the nanoparticles is achieved by introducing site directing nucleation centers of Cd thioalkanoates within Cd alkanoates, in the form of solid solutions. The formed particles are attached to the organic matrix via −C(O)S−Cd−S− bonds. The structure of those supramolecular architectures has been characterized by a variety of complementary methods, including transmission electron microscopy (TEM) and electron diffraction (ED), X-ray powder diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and other spectroscopic measurements.

Tight-Binding Method and Multiband Effective Mass Theory Applied to CdS Nanocrystals: Single-Particle Effects and Optical Spectra Fine Structure

“…4,12 To see how the optical spectrum is changed when oblate nanocrystals elongated in the z direction are considered, we carried out calculations for nanoparticles with a varying degree of ellipticity (µ 0 ). µ 0 is defined as µ 0 ) c 0 /b 0 -1, where c 0 is the length of the long z axis and b 0 is the length of the two short axes.…”

Shape‐Switchable Azo‐Macrocycles

“…This requires an accurate control of the molecular arrangements over a wide range of length scales, from micrometers down to the molecular level. Covalent, but more often non covalent intermolecular forces have been used to engineer highly ordered three dimensional supramolecular architectures where the single building blocks are held together by specific interactions, such as metal ligand bonding, [85]- [87] hydrogen bonding [88]- [91] and stacking. [92] On the other hand, self assembly at the solid liquid interface has been successfully used to control the molecular arrangement in two dimensions.…”

Arrays of Cu2+-complexed organic clusters grown on gold nano dots

“…By reducing the dimensions of the gold nucleating centers and by using various functional organic molecules with or without metal ions, a large number of organic nanoparticles can be created. Hybrid inorganic/organic or pure inorganic clusters can be similarly formed [20]. The organic nanoparticles formed complement the family of inorganic nanoparticles studied to date (see ref.…”