Nano-GO is obtained from the GO by converting micrometric lateral dimension of the  sheets to a nanometric size (below 100 nm).

Difference is there only in the lateral size and chemically both are same.

See the below paper

Review

Nano-Graphene Oxide: A Potential Multifunctional Platform for Cancer Therapy1

Nano-GO can be called as GO-quantum dot ( GO-QD), which has special features of optical properties, especially in photoluminescences. The emissions are tunable with the lateral sizes and chemical doping or modifications at the edges or in the nanosheets of the GO-QDs.

Helen

Dear Helen,

With respect, I think when we are talking about the Nano it means everything which has a dimension below 100nm. When properties are changing with size, that material is in the category of quantum materials. I think it's the reason why we call those GOs as GQDs.

So, as Mohd mentioned "Nano-GO is obtained from the GO by converting micrometric lateral dimension of the sheets to a nanometric size (below 100 nm)"

If you synthesizing GO in the lab by Modified Hummer's method, you will end up in getting GO of nano size only. Bur are you interested in getting GO and RGO. RGO has different characteristics than GO. This you can see by looking at even their xrd and NMR spectra.

Dear Sundeep Kumar Dhawan Sir,  "If you synthesizing GO in the lab by Modified Hummer's method, you will end up in getting GO of nano size only." ??

Is it so?. Which modified method? There are many one. I am not aware of the field more. It will be helpful to me. Please give link of that. I am interested in graphene quantum dots. 

In a typical process, 7 g of graphite was charged into a 1 L beaker and was heated for 10 s in a microwave oven; this expanded the graphite to 150–200 times its original volume. The resulting graphite was dispersed in concentrated H2SO4 (1000 mL) at 0oC with continuous stirring. Then, 42 g of KMnO4 was slowly added so that the temperature did not exceed 20 C. The temperature was then elevated to 35 C, and the suspension was stirred for 2 h. The ask was then chilled again in the ice bath, and distilled water (ice) was slowly added, maintaining the temperature below 70 C. The mixture was stirred for 1 h and subsequently diluted with 5 L of deionized water. Subsequently, 50 mL of H2O2 (30 wt%) was added, and vigorous bubbles appeared as the color of the suspension changed from dark brown to yellow. The suspension was centrifuged and washed with 10% HCl solution four times, followed by centrifuging at 10 000 rpm and washing with deionized water to completely remove the acid until the pH of the GO dispersion reached 6. At this point, the as-synthesized GO dispersion was a paste. The concentration of GO was 1.0 wt%, as determined aer drying the GO dispersion at 80 C under vacuum for 24 h. Next, 100 mL of the GO suspension was diluted to 200 mL and was ultrasonicated for 30 min.

Dear Dr. Sundep Kumar Dhawan, I am fascinated about the schedule of GO making you presented above. Only ONE (two) question(s) left for all of us:

You wrote ..."..followed by centrifuging at 10, 000 rpm ..."  

Since the rpm on different centrifuges will yield different g-forces (also depending on the rotor/bucket used) it is important if not mandatory to indicate also (or solely) the g-force which in this way was achieved. And, certainly, it would be interesting to know how you achieved "10,000 rpm" with a volume of 5L suspension (guessing you meant spinning down a graphite precipitate, right?). Compliments and regards, Wolfgang

Both GO and NGO are having atomic scale thickness but vary in their lateral dimensions. The length of NGO is to be less than 100 nm whereas the GO may have several micrometers in length.

The nano graphene oxide is also known as the graphene quantum dots. That when the size of the GO reduces to

Dear Amin

Thank you for best answer

Can you help meThanks

I am completely agree with Helen. Actually when the size of the graphene oxide sheets decreases to bellow 100 nm, then they show optical behavior like photoluminescene. This is the basic difference between the graphene oxide and its nano form. The GO can be synthesized by the well known Modified Hummer's method. But for the nano-GO, so many synthetic protocols (solvothermal, hydro thermal, electrochemical cutting etc.) been explored in which these as synthesized GO can be taken as the starting material.

first of all GO can refer to graphite oxide or graphene oxide 2: nano GO it about thickness of each sheet or flake of GO . Its clearly can consider physical properties in manometers and obviously can expect better performance in favorable requirement towards of application

http://www.sigmaaldrich.com/materials-science/material-science-products.html?TablePage=112007852

Nano Graphene oxide is in zero-dimension with larger degree of oxygenation.

Erdal et. al. demonstrated beautifully in his work "Article A green strategy to reduced nano-graphene oxide through micr...

The size of the graphene oxide sheets decreases to bellow 100 nm in NGO, and they show optical behavior.