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Questions related from p. Gnanaprakasam
For calculating quantum yield measurement what should be used as standard reference excitation 510 to 530 nm or emission 700-800 nm? Please explain anyone. For my compound i am getting emission at...
05 May 2015 7,213 4 View
This question may be broad, i have the doubt many people are preparing core- shell nano-particles with 2 metals or one metal and another metal oxide or polymer etc., some groups are working with...
07 July 2014 7,240 5 View
In solution reduction method to prepare Au nanoparticles by chemical reducing agents like sodium borohydride, ascorbic acid etc., are used in particular concentration. What will happen if we...
11 November 2013 3,032 3 View
The above terms are often using in all nano related paper. I am having a little confusion to differentiate these two terms. Can someone clear my doubts?
11 November 2013 4,920 9 View
I know the intensity of d band peak and g band peak, but I don't know how to calculate ID/IG can anyone explain? Thanks in advance.
09 September 2013 4,884 21 View
Usually people are using EDAX to analyze the element content, but is it possible to find out the exact carbon:oxygen ratio present in reduced graphene oxide and graphene oxide using EDAX or any...
07 July 2013 9,327 17 View
All metallic nanoparticles have a specific SPR. If the absorption is very broad then we can say the size distribution is not uniform. My question is whether it is possible to differentiate...
02 February 2013 7,777 0 View
I have recorded FTIR for reduced graphene oxide and graphite flakes it shows both transmittance and absorption peaks. Whether transmittance peaks are enough, what is the reason for the presence of...
01 January 2013 8,417 11 View
In the following paper the reported that normal hummers method and modified hummers method that is not only prepare GO but also formed the hydrophobic materials in high quantity how to seperate...
12 December 2012 3,872 0 View
Graphene is usually a hydrophobic material, that is why it settles down after the completion of the reduction process, we will use some dispersive agents to make it disperse in water, but some...
12 December 2012 1,644 10 View
I prepared graphene using chemical reduction method, i dispersed it in water it dispersed well and the dispersion was stable for a month. Now I am trying the same procedure, but the dispersion...
12 December 2012 639 12 View
Attached my file
11 November 2012 2,896 4 View
Graphene is a very good electrical conductor, but I am little bit confused about the nature of graphene oxide in some papers reported like that graphene oxide film behaves like an insulator,...
11 November 2012 4,792 18 View
Usually we synthesize graphene from GO by reduction, where the synthesis of GO is another step. Is there any method available to synthesize graphene from graphite in one step except the sticky...
11 November 2012 7,353 13 View
In elemental analysis of graphene somebody reported the % of carbon 84%,oxygen 10% some people reported carbon > 90%. actually which one is the good composition for pure graphene.
11 November 2012 2,062 6 View
I have synthesized graphite oxide using Hummers method, but sometimes the color of the product is thick brown and sometimes brownish black. After dispersion in water, both look like same (brown...
11 November 2012 2,651 11 View
