Investigation into the dispersion of graphene dispersions under different dispersion conditions

To address the characteristic that graphene was difficult to disperse in deionized water, four factors including dispersant type, dispersant content, pH value, and ultrasonic time were selected to construct an orthogonal test combined with signal-to-noise ratio (SNR) analysis for exploring the optimal dispersion parameters of graphene. The orthogonal test results and signal-to-noise ratio analysis results showed that dispersant type and pH value had a higher degree of influence on graphene dispersion. Combined with the characterization results of SEM, LS, and Raman spectrometer, it could be determined that a better dispersion effect was obtained when the mixture with 1% of PVP and Triton X-100 was added to the dispersion with a pH value of about 8 and 80-minute ultrasonication was conducted.