A "Double-Diamond Superlattice" Built Up of Cd ₁₇ S ₄ (SCH ₂ CH ₂ OH) ₂₆ Clusters

Abstract

A simple preparation of Cd(17)S(4)(SCH(2)CH(2)OH)(26) clusters in aqueous solution leads to the formation of colorless blocky crystals. X-ray structure determinations revealed a superlattice framework built up of covalently linked clusters. This superlattice is best described as two enlarged and interlaced diamond or zinc blende lattices. Because both the superlattice and the clusters display the same structural features, the crystal structure resembles the self-similarities known from fractal geometry. The optical spectrum of the cluster solution displays a sharp transition around 290 nanometers with a large absorption coefficient ( approximately 84,000 per molar per centimeter).

RNA Nanotechnology: Engineering, Assembly and Applications in Detection, Gene Delivery and Therapy

“…Arrays can be engineered to serve as chips in the diagnosis of diseases or to function as ultrahigh density data storage systems. 21 Ordered nanocrystals have already been assembled into superlattices by techniques such as colloidal crystallization, [54][55][56] macromolecule selfassembly, 11 57-59 complementary interactions, 48 60 61 and patterned etch pits. 62 Ordered biological structural arrays can serve as templates for the further construction of superlattices.…”

Self-Assembly of Nanoparticles in Three-Dimensions: Formation of Stalagmites

“…Currently, it is well established that metallic or semiconductor nanocrystals selfassemble to form 2D superlattices when the solvent is evaporated, provided that the size distribution of the nanocrystals is sufficiently narrow. This has been demonstrated for a wide variety of nanocrystals including gold, 1-4 silver, 5-8 cobalt, [9][10][11] copper, 12 cadmium selenide, [13][14][15][16] cadmium sulfide, 17,18 indium phosphate, 19 ferrite nanocrystals, 20 and more.…”

Synthesis and Characterization of a Size Series of Extremely Small Thiol-Stabilized CdSe Nanocrystals

“…[4][5][6] A monodisperse size series of thioalcohol-stabilized CdS 7 and CdTe 8 nanoparticles with extremely small sizes (1-3 nm size range) was synthesized in aqueous solutions and was obtained in the gram scale as redissolvable nanocrystalline powders or as crystals of nanoclusters (superstructures). 9,10 To complete the series of thiolstabilized cadmium chalcogenide nanocrystals synthesized by a wet chemical route in aqueous solution, CdSe nanoparticles were synthesized. The basic spectroscopic and structural characterizations of thiol-capped CdSe nanoparticles are presented, reserving a more detailed study of some selected CdSe samples for future investigations.…”