17 Questions 25 Answers 0 Followers
Questions related from Ahmed Galal Abdelrehim
If I have deposited semiconductor thin film followed by metal deposition for electrical measurements, and since both of the shape and area of the contact electrode a can be varied,s illustrated in...
09 September 2018 846 4 View
Optical absorption of nanoparticles is characterized by broad absorption spectrum with no clear edge for the main absorption band (I. e. Band gap). What are the main reasons?
02 February 2018 4,638 7 View
Through the analysis of some spectroscopic spectra (e.g. XRD, PL, FTIR and Raman) various baseline mode can be applied for obtaining a well defined Gaussian or lorentzian peaks, hence baseline...
01 January 2018 6,668 2 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...
07 July 2016 10,062 1 View
I excited nanostructured ZnS with two different wavelengths and get the same emission peak center, but there is a big difference in the emission intensity, really I found difficulty in the...
07 July 2016 6,062 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...
10 October 2015 2,600 2 View
in some physical experiment glass convex lens were placed in the path of laser light for magnification geometrically not Intensity. I wander how this and the laser incident parallel to the...
03 March 2015 9,122 0 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?
11 November 2014 5,620 9 View
I have a strange result, in which CdSO3 is formed with annealing of CdS nanoparticles at 600oC. I assumed that I would be getting CdO, so it's a strange result for me and no literature confirms...
09 September 2014 2,358 3 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.
07 July 2014 1,315 2 View
say you exposure your sample to gamma souce what is the effect on the optical properties?
07 July 2014 5,147 1 View
Polyethylene glycol used as a surfactant to prepare metal oxide nano particles.
07 July 2014 8,105 1 View
i have lock in amplifier in my laboratory and want to learn how to use it properly
07 July 2014 2,316 1 View
I prepared ZnO via a different method but I found something. I think it's a strange optical band gap.
03 March 2014 1,979 5 View
Changing of melting point from bulk to nano phase.
01 January 2014 226 1 View
I have a strange behavior between crystallite size and energy gap.
12 December 2013 3,790 2 View
Such as ZnS has melting point in bulk is it would change in nano.
12 December 2013 4,273 8 View
