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Continuous Production of Functionalized Graphene Inks by Soft Solution Processing.

Kodepelly Sanjeeva Rao1, Jaganathan Senthilnathan1,2, Jyh-Ming Ting1

  • 1Promotion Center for Global Materials Research (PCGMR), Department of Material Science and Engineering, National Cheng Kung University, Tainan 701, Taiwan.

Nanomaterials (Basel, Switzerland)
|July 29, 2023
PubMed
Summary
This summary is machine-generated.

We developed a two-stage method for continuous production of nitrogen-functionalized graphene nanosheets (N-FG). This process enables direct production of N-FG inks via solution processing, simplifying graphene functionalization.

Keywords:
continuous productionfunctionalized grapheneinkssolution processing

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Nanotechnology

Background:

  • Graphene nanosheets (GNSs) require effective functionalization for advanced applications.
  • Existing methods for graphene functionalization often involve complex post-processing steps.

Purpose of the Study:

  • To develop a continuous, solution-based method for producing nitrogen-functionalized graphene nanosheets (N-FG).
  • To demonstrate the simplified processing of N-FG into inks without drying or milling.

Main Methods:

  • A two-stage reaction: electrochemical exfoliation of graphite using a glycine-bisulfate ionic complex to produce few-layer GNSs, followed by microwave-assisted nitrogen functionalization using azobisisobutyronitrile.
  • Characterization using Raman spectroscopy and X-ray photoelectron spectroscopy (XPS) to confirm nitrogen incorporation.

Main Results:

  • Successful synthesis of nitrogen-functionalized graphene (N-FG) with confirmed nitrogen group insertion via Raman and XPS.
  • Significantly enhanced dispersibility of N-FG in various solvents (DMF, ethylene glycol, acetonitrile, water) after synthesis.
  • Demonstration of direct N-FG ink production through a simple washing-centrifugation-dispersion sequence, avoiding drying and milling.

Conclusions:

  • The study presents a novel 'continuous solution processing' method for N-FG inks.
  • This approach bypasses complicated post-processing, offering a greener and more efficient route for graphene functionalization and ink formulation.