I want to prepare a conductive ink. But i couldn't find any journal that provides a formulation for dispersing commercialized graphene in DMF. I want to know what formulation can give a homogenous ink/solution
Typically polar aprotic solvents and soncation should give you a good dispersion. Few solvents that are identified as good dispersing agents are: NMP, DMSO and DMF.
Below reference may also give more information: Article A Manufacturing Perspective on Graphene Dispersions
Graphene can be dispersed utterly in the DMF solvent. If you want to get a homogeneous solution, just sonicate the solution 15-20 min.
I agree with both Dheeraj Mondal and Kishore Kumar Sriramoju. It should be dispersed easily in DMF with sonicatiion. Any of you know power of the sonic horn that should be used? In the past I have used 750-Watt Ultrasonic Processors with pulsing, graphene cane be dispersed pretty good with stable dispersions.
Anagi M Balachandra Your technique will contaminate the graphene with ultrasound transducer material... In a volatile solvent then most of the energy is converted into heat and boiling the solvent rather than dispersion. See:
Ultrasound, cavitation, and the singing kettle
https://www.malvernpanalytical.com/en/learn/events-and-training/webinars/W130619UltrasoundCavitationSingingKettle.html
750W is really ultrasound milling...
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