Manipulation of Aqueous Growth of CdTe Nanocrystals To Fabricate Colloidally Stable One-Dimensional Nanostructures

• DOI: 10.1021/ja061787h
• Publication Date: 2006-07-18T09:00:28Z
• Authors: Hao Zhang; Dayang Wang; Bai Yang; Helmuth Möhwald
• Keywords: Cadmium telluride photovoltaics

The present article is devoted to systematically exploring the influence of various experimental variables, including precursor concentration, ligand nature, counterion type, Cd-to-Te molar ratio, pH, and temperature, on aqueous growth CdTe nanocrystals. may be divided into two stages: early fast stage later slow stage. found dominated by Ostwald ripening (OR), being strongly dependent all conditions. In contrast, adding monomers nanocrystals, which dramatically accelerated lowering concentrations using ligands with a molecular structure similar that thioglycolic acid (TGA). This observed during organometallic nanocrystals in hot organic media. On basis this finding, one-dimensional wurtzite nanostructures can directly prepared media storing rather dilute solution (2.4 mM reference ligand) presence TGA at lower temperature (from room 80 degrees C). A low used suppress OR crystal growth. addition, simultaneous both TGA-like 1-thioglycerol or 2-mercaptoethylamine leads formation colloidally stable 1D controlled aspect ratios.