This study presents a method to produce high-quality, single-layer graphene sheets (GS) and their use in Langmuir-Blodgett (LB) films for transparent conducting applications. The process involves exfoliating expandable graphite, re-intercalating it with oleum and tetrabutylammonium hydroxide (TBA), and then sonication in a surfactant solution to form a homogeneous suspension. The resulting GS are characterized by AFM, TEM, and XPS, showing high crystallinity and minimal functional groups, indicating high quality. The GS are then used to create LB films on various substrates, achieving high transparency and conductivity. The LB films are made by transferring the GS suspension onto a water subphase, compressing the floating GS, and transferring the film onto a solid substrate. The resulting LB films have sheet resistances of ~150k, 20k, and 8k ohm for 1-, 2-, and 3-layer films, respectively, with transmittance of ~93%, 88%, and 83% at 1000nm. The GS films exhibit excellent electrical conductivity, comparable to those made from sonicated natural graphite in dimethylformamide. The study also compares the properties of the GS with those of graphene oxide (GO), showing that the GS have significantly higher conductivity and fewer defects. The method allows for the large-scale production of high-quality GS, enabling scalable applications such as transparent conducting films in solar cells. The GS are prepared by exfoliating expandable graphite, re-intercalating it with oleum and TBA, and then sonication in a surfactant solution. The resulting GS are characterized by AFM, TEM, and XPS, showing high crystallinity and minimal functional groups. The GS are then used to create LB films on various substrates, achieving high transparency and conductivity. The LB films are made by transferring the GS suspension onto a water subphase, compressing the floating GS, and transferring the film onto a solid substrate. The resulting LB films have sheet resistances of ~150k, 20k, and 8k ohm for 1-, 2-, and 3-layer films, respectively, with transmittance of ~93%, 88%, and 83% at 1000nm. The GS films exhibit excellent electrical conductivity, comparable to those made from sonicated natural graphite in dimethylformamide. The study also compares the properties of the GS with those of GO, showing that the GS have significantly higher conductivity and fewer defects. The method allows for the large-scale production of high-quality GS, enabling scalable applications such as transparent conducting films in solar cells.This study presents a method to produce high-quality, single-layer graphene sheets (GS) and their use in Langmuir-Blodgett (LB) films for transparent conducting applications. The process involves exfoliating expandable graphite, re-intercalating it with oleum and tetrabutylammonium hydroxide (TBA), and then sonication in a surfactant solution to form a homogeneous suspension. The resulting GS are characterized by AFM, TEM, and XPS, showing high crystallinity and minimal functional groups, indicating high quality. The GS are then used to create LB films on various substrates, achieving high transparency and conductivity. The LB films are made by transferring the GS suspension onto a water subphase, compressing the floating GS, and transferring the film onto a solid substrate. The resulting LB films have sheet resistances of ~150k, 20k, and 8k ohm for 1-, 2-, and 3-layer films, respectively, with transmittance of ~93%, 88%, and 83% at 1000nm. The GS films exhibit excellent electrical conductivity, comparable to those made from sonicated natural graphite in dimethylformamide. The study also compares the properties of the GS with those of graphene oxide (GO), showing that the GS have significantly higher conductivity and fewer defects. The method allows for the large-scale production of high-quality GS, enabling scalable applications such as transparent conducting films in solar cells. The GS are prepared by exfoliating expandable graphite, re-intercalating it with oleum and TBA, and then sonication in a surfactant solution. The resulting GS are characterized by AFM, TEM, and XPS, showing high crystallinity and minimal functional groups. The GS are then used to create LB films on various substrates, achieving high transparency and conductivity. The LB films are made by transferring the GS suspension onto a water subphase, compressing the floating GS, and transferring the film onto a solid substrate. The resulting LB films have sheet resistances of ~150k, 20k, and 8k ohm for 1-, 2-, and 3-layer films, respectively, with transmittance of ~93%, 88%, and 83% at 1000nm. The GS films exhibit excellent electrical conductivity, comparable to those made from sonicated natural graphite in dimethylformamide. The study also compares the properties of the GS with those of GO, showing that the GS have significantly higher conductivity and fewer defects. The method allows for the large-scale production of high-quality GS, enabling scalable applications such as transparent conducting films in solar cells.