This paper reports a method to produce high-quality, single-layer graphene sheets (GS) suspended in organic solvents through exfoliation, re-intercalation, and expansion of graphite. The GS exhibit high electrical conductance at both room and cryogenic temperatures. Large amounts of GS are assembled into transparent conducting films using the Langmuir-Blodgett (LB) technique, demonstrating their potential for scalable applications. The method involves exfoliating commercial expandable graphite, re-intercalating it with oleum, and inserting tetrabutylammonium hydroxide (TBA) into the intercalated graphite. The GS are then suspended in a surfactant solution and transferred to various solvents, including water and organic solvents. Characterization techniques such as atomic force microscopy (AFM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS) confirm the high quality and crystallinity of the GS. Electrical device fabrication shows that the GS have low resistance and high transparency, making them suitable for transparent conducting films. The LB films of GS have sheet resistances of 8 kOhm and transparencies over 80%, comparable to those of graphene sheets formed by sonication of natural graphite. This scalable synthesis and processing of high-quality graphene sheets open up new possibilities for applications such as solar cells.This paper reports a method to produce high-quality, single-layer graphene sheets (GS) suspended in organic solvents through exfoliation, re-intercalation, and expansion of graphite. The GS exhibit high electrical conductance at both room and cryogenic temperatures. Large amounts of GS are assembled into transparent conducting films using the Langmuir-Blodgett (LB) technique, demonstrating their potential for scalable applications. The method involves exfoliating commercial expandable graphite, re-intercalating it with oleum, and inserting tetrabutylammonium hydroxide (TBA) into the intercalated graphite. The GS are then suspended in a surfactant solution and transferred to various solvents, including water and organic solvents. Characterization techniques such as atomic force microscopy (AFM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS) confirm the high quality and crystallinity of the GS. Electrical device fabrication shows that the GS have low resistance and high transparency, making them suitable for transparent conducting films. The LB films of GS have sheet resistances of 8 kOhm and transparencies over 80%, comparable to those of graphene sheets formed by sonication of natural graphite. This scalable synthesis and processing of high-quality graphene sheets open up new possibilities for applications such as solar cells.