title: Highly effective SERS substrates based on an atomic-layer-deposition-tailored nanorod array scaffold.
abstract: When two metallic surfaces supporting plasmonic excitation are brought into close proximity of each other, a nanogap (of width on the subwavelength scale) will form, which boosts greatly the local optical field. Based on this idea, we fabricated two types of three-dimensional plasmonic substrates with such nanogaps, taking advantage of both atomic layer deposition (ALD) and the capillary effect. Owing to the counteraction of the gap-reducing and capillary, nanogaps with different widths and profiles have been formed on the scaffold of aligned ZnO nanorods and shown to induce large field enhancement with enhancement factor up to 2.64 × 10(6) for surface-enhanced Raman scattering (SERS).
authors.affiliation: Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, 637371, Singapore.
authors.forename: Monan
authors.initials: M
authors.lastname: Liu
authors.forename: Li
authors.initials: L
authors.lastname: Sun
authors.forename: Chuanwei
authors.initials: C
authors.lastname: Cheng
authors.forename: Hailong
authors.initials: H
authors.lastname: Hu
authors.forename: Zexiang
authors.initials: Z
authors.lastname: Shen
authors.forename: Hong Jin
authors.initials: HJ
authors.lastname: Fan
mesh_terms: D043942:Nanotubes / Q000737:chemistry* / Q000648:ultrastructure; D012235:Rhodamines / Q000737:chemistry; D013059:Spectrum Analysis, Raman; D013379:Substrate Specificity; D015034:Zinc Oxide / Q000737:chemistry
chemical_list: C100620:5-carboxyrhodamine-6G; D012235:Rhodamines; D015034:Zinc Oxide