Highly conductive quasi-defect-free reduced graphene oxide for qualitative scalable production. (25th January 2023)

• Record Type: Journal Article
• Authors: 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
• Is Part Of: Carbon. Volume 203(2023)
• Page Start: 221
• Page End: 229
• Publication Date: 2023-01-25
• Subjects: Reduced graphene oxide -- Quasi-defect-free -- Semimetallic conduction -- Conductive paste -- Scalable production; Carbon -- Periodicals; Carbone -- Périodiques; Koolstof; Toepassingen; Electronic journals; 546.681
• DOI: 10.1016/j.carbon.2022.11.041
• Languages: English
• ISSNs: 0008-6223

Abstract

Abstract: 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 metal-like 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 ∼1000 S/cm. Moreover, during a 200-h test with temperature and moisture conditions of 85 °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. Graphical abstract: A promising approach for the high-quality scalable production of QrGO is proposed. The remarkable electrical, optical, and thermal characteristics of QGO and QrGO are examined, showing a semicrystalline graphene structure. The transport phenomena exhibit a metal-like behavior, resembling that of mechanically exfoliated graphene, unlike the variable-range hopping behavior of general rGO. The electrical conductivity of QrGO is considerably high at almost 1000 S/cm. Image 1