Synthesis of CdS: Cu Nanorods For Application In Photonic Devices

In our present work undoped CdS and Cu doped CdS thin films were deposited on glass substrate by chemical bath method. XRD analysis of the as-prepared sample indicated CdS:Cu nanorods to be mixture of two phases namely hexagonal and cubic. It has been observed that one particular plane (100) has preferentially grown as the maximum intense peak whereas the other two planes (101) and (102) have diminished intensities indicating the highly oriented growth of the particles. TEM image of CdS: Cu nanostructure shows the garland like nanorod structures that consist of the mixture of cubic and hexagonal particles. Hexagonal particles confirm the hexagonal phase of the CdS. Some particles dispersed in hexagonal form are weakly agglomerated. The size of the hexagonal structure is in the range of 75-100nm. The TEM image of the undoped CdS reveals the similar hexagonal structure of those CdS nanoparticles. The UV_VIS spectra of Cu doped CdS show the red shift of quantum confinement over undoped CdS. The additional long wavelength absorptions shows that copper can exists as different types of impurities such as replacing host Cd in its lattice site as well as interstitials within the crystal lattice.