title: Fast synthesis of high-quality reduced graphene oxide at room temperature under light exposure.
abstract: An approach of presenting new reducing reagents, sodium-benzophenone (Na-B) or Na-B in the presence of the hydrazine (Na-B-H) system under light exposure could produce rGOs with/without N-doping at room temperature in both the solution phase and on a solid substrate. Benzophenone activated those solutions acting as a photosensitizer under light. It was assumed that the newly generated radical anions with electrons from Na-B under light can reduce GO to rGO sheets (rGONa-B1). In addition, the Na-B-H system can allow a higher degree of reduction with the doping of nitrogen atoms by the introduction of hydrazine to produce radical anions and electrons with a sodium hydrazide complex, which helps decrease the sheet resistance of the as-made rGONa-B-H2. The excellent properties (very low oxygen content (C/O ∼16.2), and low sheet resistance (∼130 Ω square(-1))) of the rGOs were confirmed by XPS, XRD, IR, Raman spectroscopy, TGA, wettability, and sheet resistance measurements. High-quality rGO films on flexible substrates could be prepared by directly immersing the GO films in these solutions for several minutes.
authors.affiliation: National Creative Research Initiative, Center for Smart Molecular Memory, Department of Chemistry, Sungkyunkwan University, 2066 Seoburo, Jangan-Gu, Suwon, Gyeonggi-Do 440-746, Republic of Korea.
authors.forename: Surajit
authors.initials: S
authors.lastname: Some
authors.forename: Sungjin
authors.initials: S
authors.lastname: Kim
authors.forename: Khokan
authors.initials: K
authors.lastname: Samanta
authors.forename: Youngmin
authors.initials: Y
authors.lastname: Kim
authors.forename: Yeoheung
authors.initials: Y
authors.lastname: Yoon
authors.forename: Younghun
authors.initials: Y
authors.lastname: Park
authors.forename: Sae Mi
authors.initials: SM
authors.lastname: Lee
authors.forename: Keunsik
authors.initials: K
authors.lastname: Lee
authors.forename: Hyoyoung
authors.initials: H
authors.lastname: Lee