Abstract
TOP/TOPO-capped CdSe nanorods were synthesized by colloidal route process using hexylphosphonic acid as a ligand and CdO as a Cd precursor, and the influence of thermal annealing in air on the morphology, crystal structure and optical properties of CdSe nanorods has been elucidated by XRD, TEM and PL analysis. It was observed that as-synthesized CdSe nanorods of ∼ 4–5 nm diameters and ∼ 20 nm lengths go through solid state morphology transformation upon annealing at 350 °C in air atmosphere, forming the nanorods with bullet shape with one side pointed and the other side having a blunt hexagon with the average diameter of ∼ 12 nm and length of ∼ 25 nm. The annealed CdSe nanorods showed improved PL emissions without the shift of peak positions, indicating significant improvement of the crystallinity and optoelectronic properties of nanorods caused by reduction of defects.
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