Jeong, Sooyeon Yang, Sunhye Kim, Byeong Guk Lee, Hye Jung Bae, Jung Jun Kim, Jung Hun Kim, Jung Mo Lee, Wonki Hwang, Jun Yeon Choi, Soyeon Jeong, Hee Jin Park, Jong Hwan Choi, Young Chul Lee, Geon-Woong Jeong, Seung Yol 2024-01-19T10:31:31Z 2024-01-19T10:31:31Z 2022-12-22 2023-01 0008-6223 https://pubs.kist.re.kr/handle/201004/114169 Herein, we present a potential approach for the qualitative production of quasi-defect-free reduced graphene oxide (QrGO) with semimetallic transport behavior. In rGO, the formation of defects is highly dependent on the oxidation process of graphite. Subsequent exfoliation of graphite oxide, the quasi-defect-free graphene oxide (QGO) shows abundant epoxy and hydroxyl groups which confirmed the suppressed structural deformation. Typical rGO and QrGO are compared to characterize the remarkable electrical, optical, and thermal properties of QrGO. In particular, under low temperature, the unusual carrier transport phenomena of QrGO exhibits a metallike behavior, unlike typical rGO, which shows an insulator-to-semimetal transition with variable-range hopping conduction behavior. This conduction mechanism, resembling that of mechanically exfoliated graphene, facilitates the fabrication of a QrGO-based conducting film with a high electrical conductivity of similar to 1000 S/cm. Moreover, during a 200-h test with temperature and moisture conditions of 85 degrees C and 85%, respectively, QrGO shows environmental stability with minimal fluctuations in resistance. Furthermore, a conducting paste was fabricated from QrGO in an aqueous solution, showing a highly concentrated solid content and excellent electrical conductivity. It shows great potential for the large-scale production of high-quality chemically exfoliated graphene for practical applications. English Pergamon Press Ltd. Highly conductive quasi-defect-free reduced graphene oxide for qualitative scalable production Article 10.1016/j.carbon.2022.11.041 1 Carbon, v.203, pp.221 - 229 Carbon 203 221 229 Y scie scopus 000892299100004 2-s2.0-85143120985 Chemistry, Physical Materials Science, Multidisciplinary Chemistry Materials Science Article FEW-LAYER GRAPHENE RAMAN-SPECTROSCOPY GRAPHITE EXFOLIATION SCATTERING NANOSHEETS REDUCTION TRANSPORT Reduced graphene oxide Quasi-defect-free Semimetallic conduction Conductive paste Scalable production