11 Questions 14 Answers 0 Followers
Questions related from Ahmed Galal Abdelrehim
When we measure the photoluminescence (PL) emission of some nanoparticles we find sometimes emission bands at energy higher than the optical bandgap. It is normal to observe photoluminescence at...
23 August 2023 204 1 View
Through fitting of XRD patterns for identifications the exact peaks positions there any many peaks fitting functions predefined in origin lab library; hence I am wondering which is the best for XRD?
30 January 2018 7,973 3 View
in the case of ZnS nanoparticles, the transformation from cubic to hexagonal associated with the increase in the particle size and decrease in the value of optical band gap, which is contrary to...
09 July 2016 9,684 1 View
in attempt for investigation the distribution of trap states in ternary alloy of ZnxCd1-xS quantum dots, which produced by Zn, Cd and S interstitial and vacancies, some confusion in understanding...
03 October 2015 8,046 2 View
If I have nanostructure metal oxide, how can I determine optical band gap from luminescence spectra?
22 March 2015 6,049 16 View
I tried to measure I - V characteristics for nanoparticles in the powder form, but I found it was not easy. What are the suitable circumstances for an accurate measurement?
08 November 2014 276 7 View
I prepared semiconductor nanoparticles, but the problem I face is in the high absorption, which have a sharp rise. When I use it in tauc analysis to get band gap i have a big shift in the band gap.
19 July 2014 3,908 2 View
When metal chalcogen is exposed to gamma radiation, what are parameters that related to nano size?
05 July 2014 8,475 4 View
I prepared ZnO via a different method but I found something. I think it's a strange optical band gap.
31 March 2014 9,447 3 View
Can we see atoms or molecules arranged in lattice?
16 January 2014 9,742 1 View
I have a strange behavior between crystallite size and energy gap.
27 December 2013 2,575 2 View
