Dimension‐Controlled Synthesis of CdS Nanocrystals: From 0D Quantum Dots to 2D Nanoplates

Abstract

The dimension-controlled synthesis of CdS nanocrystals in the strong quantum confinement regime is reported. Zero-, one-, and two-dimensional CdS nanocrystals are selectively synthesized via low-temperature reactions using alkylamines as surface-capping ligands. The shape of the nanocrystals is controlled systematically by using different amines and reaction conditions. The 2D nanoplates have a uniform thickness as low as 1.2 nm. Furthermore, their optical absorption and emission spectra show very narrow peaks indicating extremely uniform thickness. It is demonstrated that 2D nanoplates are generated by 2D assembly of CdS magic-sized clusters formed at the nucleation stage, and subsequent attachment of the clusters. The stability of magic-sized clusters in amine solvent strongly influences the final shapes of the nanocrystals. The thickness of the nanoplates increases in a stepwise manner while retaining their uniformity, similar to the growth behavior of inorganic clusters. The 2D CdS nanoplates are a new type of quantum well with novel nanoscale properties in the strong quantum confinement regime.

Flexible quantum dot light-emitting diodes for next-generation displays

“…QDs have many advantages in display applications, originating from the quantumconfinement effect. [16][17][18][19][20][21][22][23][24] For example, emission wavelengths of CdSe QDs can be tuned by changing their size to emit the entire visible light (Fig. 2a).…”

Enhanced photocatalytic and photoelectrochemical properties of TiO2 nanorod arrays sensitized with CdS nanoplates

“…CdS nanoplates (NPLs) have good stability, high extinction coefficients and can be spectrally tuned by altering plate thickness in order to effectively harvest sunlight [9]. There have been several reports on attaching CdS to various TiO 2 surfaces using different methods, such as chemical bath deposition (CBD) [10], successive ion layer absorption and reaction (SILAR) [11] and electrodeposition methods [12].…”

Cadmium Chalcogenide Nano‐Heteroplatelets: Creating Advanced Nanostructured Materials by Shell Growth, Substitution, and Attachment

“…Cadmium chalcogenides, CdX (X = Se, S, Te), form a crystal lattice of two possible types: a hexagonal wurtzite lattice and a cubic zinc blend lattice of sphalerite . Hexagonal nanoplatelets are obtained via soft colloidal template synthesis in layered lamellar structures.…”