Effect of solvent nature on the stability of highly dispersed and nanosized cadmium telluride

Colloidal Cu2ZnSnS4-based and Ag-doped Nanocrystals: Synthesis and Raman Spectroscopy Study

“…Taking into account that CZTS and CAZTS NCs obtained by this procedure have a charge on the surface, the ions present in the system can interact with NCs surface. To decrease the effect of nature and number of precursors on stability and the optical properties of obtained colloidal solutions, we developed a procedure for recovery of NCs from initial solutions by a selective precipitation method similar to the one in our previous reports on NCs CdTe [34]. For this purpose, equimolar volumes of initial solution and 2-propanol were mixed in a glass cylinder and kept for 1 min at room temperature under constant stirring.…”

Effect of medium pH on the optical properties of CdTe nanocrystals at colloidal synthesis and postsynthetic treatment

“…A colloidal solution of CdTe NC was obtained according to procedure described earlier in [1,11] by reacting 2 × 10 -3 mol of CdI 2 and 2 × 10 -4 mol of H 2 Te in the presence of stabilizer at 2 < pH < 12 depending on stabilizer nature. As stabilizers of CdTe NC surface in the synthesis, we used thiourea (6.6 × 10 -2 mol/L), hydroxyethylidenediphosphonic acid (HEDP) (2.43 × 10 -2 mol/L), ethylenediaminetetraacetic acid (EDTA) (1 × 10 -2 mol/L), and thioglycolic acid (4.6 × 10 -2 -1.15 × 10 -1 mol/L), as well as L-cysteine hydrochloride (L-cys) (3.7 × 10 -2 -4.8 × 10 -2 mol/L).…”

“…The scope of research in the field of semiconducting nanomaterials rapidly grows every year. The main interest of researchers is focused on the optical properties of nanocrystals (NC), which are important for a wide number of applications, namely, in photodetecting, light emitting, and photovoltaic devices as well as biological sensors and markers [1,2].…”

“…The method of colloidal synthesis allows preparation of CdTe NC with average hydrodynamic radius from 1 to 1000 nm and pronounced photoluminescent (PL) properties [1,3]. The advantage of this method is the possibility to obtain large amount (10 18 -10 20 ) of NC in the course of one synthesis.…”