title: Si/ZnO nanocomb arrays decorated with Ag nanoparticles for highly efficient surface-enhanced Raman scattering.
abstract: High-density ZnO nanocombs were first grown on a nanoporous silicon pillar array, and pre-prepared 3D Si/ZnO/Ag nanocomb arrays were employed as substrates for surface-enhanced Raman scattering (SERS). The finite-difference time-domain simulation result shows that two kinds of inter-Ag-NP nanogaps in the geometry create a large number of SERS "hot spots," which contributes to the detection limits for rhodamine-6G as low as 10⁻¹² M and the Raman enhancement factor as large as 10⁹. The linear dependence between the Raman peak intensities and the concentrations of thiram provides a new calibration method for rapid and quantitative detection of trace organic molecules.
authors.forename: Hong Jun
authors.initials: HJ
authors.lastname: Yin
authors.forename: Yu Fei
authors.initials: YF
authors.lastname: Chan
authors.forename: Zheng Long
authors.initials: ZL
authors.lastname: Wu
authors.forename: Hai Jun
authors.initials: HJ
authors.lastname: Xu
mesh_terms: D004867:Equipment Design; D019544:Equipment Failure Analysis; D008027:Light; D053768:Metal Nanoparticles / Q000737:chemistry*; D036103:Nanotechnology / Q000295:instrumentation; D009930:Organic Chemicals / Q000032:analysis*; D012031:Refractometry / Q000295:instrumentation*; D012542:Scattering, Radiation; D012825:Silicon / Q000737:chemistry*; D012834:Silver / Q000737:chemistry*; D013059:Spectrum Analysis, Raman / Q000295:instrumentation*; D013499:Surface Properties; D015034:Zinc Oxide / Q000737:chemistry*
chemical_list: D009930:Organic Chemicals; D012834:Silver; D015034:Zinc Oxide; D012825:Silicon