▎ 摘　　要

This paper presents a novel yet simple method to design graphene quantum dots (GQDs) by using 2-Hydroxypropane-1,2,3-tricarboxylic acid. The formation of GQDs is confirmed by X-ray diffraction. Using Debye-Scherrer's equation, and the average size found is similar to 3.5 nm. Based on SEM analysis, grain shapes are similar and almost square/rectangular in shape. The UV-visible and Photoluminescence spectrum confirms the fact that GQDs exhibit optical absorption in the visible range. The band gap energy of GQDs was reported using the Tauc plot method and found to be 2.52 eV. Dielectric properties are explained by the dipolar relaxation phenomenon. Dielectric permittivity (epsilon) increases very slowly in the low-temperature region (below 400 K) and then increases as temperature increases. This is explained by thermal vibrations of dipoles in the low-temperature region. Frequency-dependent ac conductivity follows the Jonscher's power law, showing semiconductor behaviour below 373 K, and insulating behaviour above that level. Positive magneto-dielectric effect is observed for dielectric permittivity (epsilon), while both positive and negative effects are observed for tangent loss (tan delta). Its extraordinary properties, such as high epsilon and low tan delta, make it suitable for capacitors, microelectronics, optoelectronics, and microwave applications.