Enhanced electrical conductivity of doped graphene fiber via vacuum deposition
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Carbon Letters https://doi.org/10.1007/s42823-020-00193-3
ORIGINAL ARTICLE
Enhanced electrical conductivity of doped graphene fiber via vacuum deposition Beum Jin Park1 · Ho Seok Park1,2,3 Received: 6 August 2020 / Revised: 9 September 2020 / Accepted: 19 September 2020 © Korean Carbon Society 2020
Abstract Graphene fiber is considered as a potential material for wearable applications owing to its lightness, flexibility, and high electrical conductivity. After the graphene oxide (GO) solution in the liquid crystal state is assembled into GO fiber through wet spinning, the reduced graphene oxide (rGO) fiber is obtained through a reduction process. In order to further improve the electrical conductivity, herein, we report N, P, and S doped rGO fibers through a facile vacuum diffusion process. The precursors of heteroatoms such as melamine, red phosphorus, and sulfur powders were used through a vacuum diffusion process. The resulting N, P, and S doped rGO fibers with atomic% of 6.52, 4.43 and 2.06% achieved the higher electrical conductivities compared to that of rGO fiber while preserving the fibrious morphology. In particular, N doped rGO fiber achieved the highest conductivity of 1.11 × 104 S m−1, which is 2.44 times greater than that of pristine rGO fiber. The heteroatom doping of rGO fiber through a vacuum diffusion process is facile to improve the electrical conductivity while maintaining the original structure. Keywords Graphene fiber · Heteroatom doping · Vacuum deposition · Electrical conductivity
1 Introduction Wearable devices are very important for future electronics such as energy harvesting, electronic textiles, healthcare, and smart robots [1]. The key materials for wearable devices should be light and flexible while satisfying requirements for functional applications. Accordingly, the functional materials in the form of fibers are proposed to meet current research trends. Among various fibrous materials, Electronic supplementary material The online version of this article (https://doi.org/10.1007/s42823-020-00193-3) contains supplementary material, which is available to authorized users. * Ho Seok Park [email protected] 1
School of Chemical Engineering, Sungkyunkwan University, 2066, Seoburo, Jangan‑gu, Suwon 16419, Republic of Korea
2
Department of Health Sciences and Technology, Samsung Advanced Institute for Health Sciences and Technology (SAIHST), Sungkyunkwan University, 2066, Seoburo, Jangan‑gu, Suwon 16419, Republic of Korea
3
SKKU Advanced Institute of Nano Technology (SAINT), Sungkyunkwan University, 2066, Seoburo, Jangan‑gu, Suwon 16419, Republic of Korea
carbon-based fibers are very attractive owing to their lightness, high electrical conductivity, mechanical integrity, and chemical and environmental stabilities [2]. For instance, carbon fiber (CF), carbon nanotube (CNT) fiber, and graphene fiber have been extensively investigated so far [3–6]. Graphene is regarded as a 2D carbon allotrope, consisting of hexagonal lattice, owing to its excellent inherent mobility, ext
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