Transparent conductive films (TCFs) are materials with both high optical transmittance and high electrical conductivity. This thesis focuses on developing high transparent, high conductive, and low-cost transparent conductive films. This thesis reports Na-ion intercalated reduced graphene oxide (Na-RGO) films as low-cost, scalable, high performance transparent conductive films. The interlayer distance of RGO allows for Na-ion intercalation, which causes energy band structure changes and electron doping. As a result, a simultaneous increase in both transmittance and sheet conductivity has been achieved. The visible light transmittance and sheet resistance showed great enhancement from 36%, 83 kΩ/sq to 87%, 311 Ω /sq before and after Na-ion intercalation. The air stability test showed that the optical and electronic properties of Na-RGO films were more stable than Li-ion intercalated graphene. The results demonstrated the great potential of Na-ion intercalated printed RGO films for TCFs applications.