title: Single nanowire on graphene (SNOG) as an efficient, reproducible, and stable SERS-active platform.
abstract: Developing a well-defined nanostructure that can provide strong, reproducible, and stable SERS signals is quite important for the practical application of surface-enhanced Raman scattering (SERS) sensors. We report here a novel single nanowire (NW) on graphene (SNOG) structure as an efficient, reproducible, and stable SERS-active platform. Au NWs having a well-defined single-crystal geometry on a monolayer graphene-coated metal film can form a well-defined, continuous nanogap structure that provides extremely reproducible and stable SERS signals. The in-NW reproducibility was verified by 2-dimensional Raman mapping, and the NW-to-NW reproducibility was verified by the cumulative curves of 32 SERS spectra. The simulation also indicated that a highly regular, line-shaped hot spot formed between the Au NW and graphene. Furthermore, SNOG platforms showed improved photostability and long-term oxidation immunity. We anticipate that SNOG platforms will be appropriate for practical biological and chemical sensor applications that demand reproducible, stable, and strong signal production.
authors.affiliation: Department of Chemistry, KAIST, Yuseong-gu, Daejeon 34141, Korea. bongsoo@kaist.ac.kr.
authors.forename: Hongki
authors.initials: H
authors.lastname: Kim
authors.affiliation: Department of Electrical Engineering, KAIST, Yuseong-gu, Daejeon 34141, Korea. ykchoi@ee.kaist.ac.kr.
authors.forename: Myeong-Lok
authors.initials: ML
authors.lastname: Seol
authors.affiliation: Department of Electrical Engineering, KAIST, Yuseong-gu, Daejeon 34141, Korea. ykchoi@ee.kaist.ac.kr.
authors.forename: Dong-Il
authors.initials: DI
authors.lastname: Lee
authors.affiliation: Department of Chemistry, KAIST, Yuseong-gu, Daejeon 34141, Korea. bongsoo@kaist.ac.kr.
authors.forename: Jiyoung
authors.initials: J
authors.lastname: Lee
authors.affiliation: National Nanofab Center, KAIST, Yuseong-gu, Daejeon 34141, Korea.
authors.forename: Il-Suk
authors.initials: IS
authors.lastname: Kang
authors.affiliation: Department of Chemistry, KAIST, Yuseong-gu, Daejeon 34141, Korea. bongsoo@kaist.ac.kr.
authors.forename: Hyoban
authors.initials: H
authors.lastname: Lee
authors.affiliation: Hazards Monitoring Bionano Research Center and BioNano Health Guard Research Center, KRIBB, Yuseong-gu, Daejeon 34141, Korea. kangtaejoon@kribb.re.kr and Major of Nanobiotechnology and Bioinformatics, UST, Yuseong-gu, Daejeon 34141, Korea.
authors.forename: Taejoon
authors.initials: T
authors.lastname: Kang
authors.affiliation: Department of Electrical Engineering, KAIST, Yuseong-gu, Daejeon 34141, Korea. ykchoi@ee.kaist.ac.kr.
authors.forename: Yang-Kyu
authors.initials: YK
authors.lastname: Choi
authors.affiliation: Department of Chemistry, KAIST, Yuseong-gu, Daejeon 34141, Korea. bongsoo@kaist.ac.kr.
authors.forename: Bongsoo
authors.initials: B
authors.lastname: Kim