Graphene Foam Cantilever Produced via Simultaneous Foaming and Doping Effect of an Organic Coagulant
- Authors
- Noh, Sung Hyun; Park, Hun; Eom, Wonsik; Lee, Hak Bong; Kang, Dong Jun; Cho, Jae Yong; Sung, Tae Hyun; Han, Tae Hee
- Issue Date
- Mar-2020
- Publisher
- AMER CHEMICAL SOC
- Keywords
- self-assembly; graphene foam; coagulants; foaming agents; chemical doping
- Citation
- ACS APPLIED MATERIALS & INTERFACES, v.12, no.9, pp.10763 - 10771
- Indexed
- SCIE
SCOPUS
- Journal Title
- ACS APPLIED MATERIALS & INTERFACES
- Volume
- 12
- Number
- 9
- Start Page
- 10763
- End Page
- 10771
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/2594
- DOI
- 10.1021/acsami.9b19498
- ISSN
- 1944-8244
- Abstract
- Inspired by the role of cellular structures, which give three-dimensional robustness to graphene structures, a new type of graphene cantilever with mechanical resilience is introduced. Here, NH4SCN is incorporated into graphene oxide (GO) gel using it as a coagulant for GO fiber self-assembly, a foaming agent, and a dopant. Subsequent thermal treatment of the GO fiber at 600 degrees C results in the evolution of gaseous species from NH4SCN, yielding internally porous graphene cantilevers (NS-GF cantilevers). The results reveal that NS-GF cantilevers are doped with N and S and thus exhibit higher electrical conductivity (150 S cm(-1)) than that of their nonporous counterparts (38.4 S cm(-1)). Unlike conventional fibers, the NS-GF cantilevers exhibit mechanical resilience by bending under applied mechanical force but reverting to the original position upon release. The tip of the NS-GF cantilevers is coated with magnetic Fe3O4 particles, and fast mechanical movement is achieved by applying the magnetic field. Since the NS-GF cantilevers are highly conductive and elastic, they are employed as bendable, magnetodriven electrical switches that could precisely read on/off signals for >10 000 cycles. Our approach suggests a robust fabrication strategy to prepare highly electroconductive and mechanically elastic foam structures by introducing unique organic foaming agents.
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