Nanostructures, surface characterization and optical properties of chemically synthesized CdTe quantum dots
Journal Title: IOSR Journal of Applied Physics (IOSR-JAP) - Year 2018, Vol 10, Issue 6
Abstract
Molar concentrations of chemical ingredients in synthesis of nanocrystals were found significant roles in the structural, surface morphology and visible range optical properties of CdTe quantum dots thin films. XRD, FESEM and UV spectrum analysis revealed that the average particle sizes approach 6-11nm quantum dots with increasing molar concentrations. The study of X-ray line profiles proved that peak intensity was increased with increasing of Cd+2 and Te2- ions in the films. The phase structure of the films were found to possess cubic zinc blend structure with (100), (110), (200), (220) and (321) reflection planes at x = 0.1, 0.2, 0.4 and 0.6M and additional planes were also observed at x = 0.8M. In all the films, (200) reflection plane showed most prominent which facilitated estimation of nanoparticle sizes. The sized dependent nanoparticles showed maximum absorption blue shift near 325nm wavelength in ultraviolet regime ascribed as first excitonic transition. This may be attributed with decreasing particle sizes indicating increasing band gap.
Authors and Affiliations
M. Rasmani Devi1 ,, S. Jogita Devi 2, K. Kunjabali Singh3
Keywords
Related Articles
- EP ID EP432002
- DOI 10.9790/4861-1006022431
- Views 58
- Downloads 0
Characterization of Pineal Region in MR Brain Images using Texture Analysis
The classification processes of MRI brain were defining the corpus,pineal gland, techunum, and third ventricle were carried out using Interactive Data Language (IDL) program as platform for the generated codes. The resul...
Solar Water Heater: Black Versus Transparent Hosepipe Heat Absorbers
We have compared the performances and efficiencies of solar water heatersconstructed using coiled black and coiled transparent hosepipes.The two hosepipes were equivalent in length and diameter measuring about 50 yards (...
A new insight into the physics of Lorentz invariance: Implications for the GZK and TeV-γ photon theories
The main argument of the Greisen-Zatsepin-Kuzmin (GZK) and TeV-γ photon theories1,2,3,4,5,6 is based on the concept of Lorentz invariance. In this paper, we revisit this concept and show that as the mathematical derivati...
Crystallographic and Magnetic Properties with Increasing Co2+ In Cu0.60-Xcoxzn0.40Fe2O4 (0 ≤ X ≤ 0.5) Nanoferrites
Nanoparticles of Cu0.60-xCoxZn0.40Fe2O4 (0 ≤ x ≤ 0.5) are prepared by sol-gel auto combustion method. Copper nitrate, cobalt nitrate, zinc nitrate, ferric nitrate and citric acid used as the starting materials. Cations r...
Outside Gravity of Spherically Symmetric Body Changes With Respect To Expansion And Contraction.
One of stated that spherically symmetric mass distributive body attracts outside object, as entire mass were not concentrated at its center i.e. gravity changes with respect to expansion and contraction. It can be proved...