20 Questions 18 Answers 0 Followers
Questions related from Mohammed Abdullah Issa
Salam all. according to the reported work in the literature, some authors used strong acid (like refluxing with HNo3) in conjugation with carbon-based precursor, while others used base such as...
12 December 2019 9,509 3 View
Hi experts. can anyone give me some details about the advantages of FWHM? is the narrower better than wider? and why? How to explain that in a scientific way so that it can be clear for any reader...
08 August 2019 8,558 8 View
Based on response surface methodology (RSM) of the design experts software, two-dimension graph were obtained. The influence of two independent variables (X1X2) on the response (QY) is shown in...
05 May 2019 8,806 4 View
Hi experts.. Can you explains why the excitation-“dependent” emission of aqueous N-CDs suddenly changed to ”independent” while binding with PVA (solid film). Is this related to PVA nature? Please...
05 May 2019 3,053 1 View
Hi all. According to the following mixture info., how to calculate the concentration of as-formed carbon dots (CDs). The initial amount of raw precursor = 0.05 gram. The mass of nitrogen element...
01 January 2019 4,501 0 View
As we know that polymer carbon dots (PDs) and graphene carbon quantum dots (GCQDs) are two types of carbon dots (CDs). How to distinguish between them so that we can decide that our synthesized...
12 December 2018 8,138 0 View
Hi all. what other alternative chemicals can be used as a cross linker for coating nanomaterial on the surface of fiber optic sensor based on layer-by-layer assembly. For instance,...
11 November 2018 2,786 3 View
Based on FTIR and XPs analysis, how to confirm that the obtained carbon dots (CDs) has (-COOH). In which form these groups can present in our material where C-C, C-N, O-H, C-H, C=O, C-O and C-O-C...
08 August 2018 2,121 5 View
Hi all. Can you suggest me an easy software for drawing any chemical reactions.
07 July 2018 2,605 0 View
Can any one please explain to me the easiest way to calculate the concentration of fluorescent carbon dots obtained from natural resources and added to nitrogen doping agent (N-CDs). It would be...
06 June 2018 10,179 0 View
Hi all. fluorescent carbon dots (CDs) have been synthesized in solution form. the concentration is still un known as most of literature focusing on the absorbance (kept below 0.1) before...
06 June 2018 9,759 0 View
I confused how emissive traps\ surface defects can play a major role on the PL origin of fluorescent carbon dots
05 May 2018 4,701 0 View
According to the literatures, I noticed some of researchers used buffer solution for the preparation of heavy metal ions, whereas the others are not and they just used deionized water for the...
02 February 2018 5,713 4 View
I confuse why most of literature is specifically used Rhodamine, Quinine sulfate, etc as a fluorescence Quantum Yield (QY) standards. Besides, I need to know if there's an easier way that make me...
12 December 2017 7,905 3 View
I'm working on nanotechnology right now. I read many articles, some of them use dialysis during their synthesis process where as the others find that filtration and centrifuge of the product is...
08 August 2017 8,170 3 View
As we know that both of linear-structured polyethyleneimine (LPEI) and ethylenediamine (EDA) can be served as surface passivation agent for doping the nanoparticles. How can we distinguish between...
01 January 1970 9,642 3 View
Based on selective luminescence study, The as-synthesized carbon nano dots (CDs) show both excitation-dependent/independent emission wavelength at one time. how can we explain that multiple behavior?
01 January 1970 2,839 8 View
Hi all. I'm wondering if there is any differences between surface state and surface energy traps regarding fluorescence mechanism of carbon dots (CDs). If yes, what is the main difference between...
01 January 1970 9,975 0 View
Based on the attached picture, is it possible for the fluorescence probe (carbon dots) to quench all the heavy metal ions with slightly different values or there is some thing wrong with the...
01 January 1970 1,172 4 View
According to HRTEM measurement, particle size distribution histogram have been obtained from one hundred particles. how to calculate their average size?
01 January 1970 3,324 5 View
