摘要： The electrophoretic deposition (EPD) of graphene-based materials on transparent substrates is highly potential for many applications. Several factors can determine the yield of EPD process, such as applied voltage, deposition time, and particularly the presence of dispersion additives (stabilizers) in the suspension solution. This study presents an additive-free EPD of GQDs thin films on Indium Tin Oxide (ITO) glass substrate and studies the deposition mechanism with the variation of the applied voltage (10 – 50 V) and deposition time (5 – 25 min). It is found that due to the small size (~3.9 nm) and high content of deprotonated carboxylic groups, the GQDs form a stable dispersion (zeta potential of about –35 mV) without using additives. The GQDs thin films can be deposited onto ITO with optimal surface morphology at 30 V in 5 min (surface roughness of approximately 3.1 (±1.3) nm). In addition, as-fabricated GQDs thin films also possess some interesting physico-optical properties, such as a double-peak photoluminescence at about 417 and 439 nm, with ca. 98% visible transmittance. This low cost and eco-friendly GQDs thin film is a promising material for various applications, e.g. transparent conductors, supercapacitors, and heat conductive film in smart windows.