Surface-enhanced Raman scattering (SERS) is a powerful fingerprint vibrational spectroscopy with a single-molecule detection limit, but its applications are generally restricted to 'free-electron–like' metal substrates such as Au, Ag and Cu nanostructures. We have invented a shell-isolated nanoparticle-enhanced Raman spectroscopy (SHINERS) technique, using Au-core silica-shell nanoparticles (Au@SiO2 NPs), which makes SERS universally applicable to surfaces with any composition and any morphology. This protocol describes how to prepare shell-isolated nanoparticles (SHINs) with different well-controlled core sizes (55 and 120 nm), shapes (nanospheres, nanorods and nanocubes) and shell thicknesses (1–20 nm). It then describes how to apply SHINs to Pt and Au single-crystal surfaces with different facets in an electrochemical environment, on Si wafer surfaces adsorbed with hydrogen, on ZnO nanorods, and on living bacteria and fruit. With this method, SHINs can be prepared for use in ∼3 h, and each subsequent procedure for SHINERS measurement requires 1–2 h.
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We thank N.F. Zheng for thoughtful discussions. This work was supported by the Ministry of Science and Technology (MOST) of China (2011YQ030124, 2010IM040100 and 2009CB930703), and by the National Natural Science Foundation of China (NSFC) (21033007, 21021002 and 20825313).
Detection of hydrogen adsorption on Pt single-crystal surface. SHINERS spectra of hydrogen adsorbed on Pt(111) at -1.2 V (a), at -1.6 V (b), at -1.9 V (c), without Au@SiO2 NPs at -1.9 V (d), and with the thicker-shell NPs at -1.9 V (e).
Detection of hydrogen adsorption on Si single-crystal surface. SHINERS spectra obtained from Si(111) treated with (a) sulphuric acid, (b) a 30% HF solution, and (c) an oxygen plasma.
Comparison of the adsorption of SCN− on Au single-crystal surface with different facets. SHINERS spectra of SCN− adsorbed on Au(100) (red curves) and Au(111) (black curves) at 0.0 V.
SERS or SHINERS spectra of PATP molecules in different sandwich configurations. (a) Au/PATP/Au NPs, (b) ZnO nanorods/PATP/Au NPs, (c) Au/PATP/Au@SiO2 NPs, and (d) ZnO nanorods/PATP/Au@SiO2 NPs.
SERS or SHINERS study of CO adsorbed on Pt single-crystal surface. The SERS spectrum of CO on Pt(111) at 0.0 V using bare Au NPs (top), and the SHINERS spectrum of CO on Pt(111) at 0.0 V using Au@SiO2 NPs (bottom).
In-situ probing biology structures by SHINERS. (a, b, c) SHINERS spectra obtained from different locations on a sample consisting of yeast cells incubated with Au@SiO2 NPs on a quartz slide. (d) The spectrum of Au@SiO2 NPs, but without yeast cells, on a quartz slide. (e) An ordinary Raman spectrum of yeast cells on a quartz slide. The peaks marked with red asterisks are related to mannoproteins.
In situ detection of a pesticide residue on an orange skin. The Raman signals were collected using a Raman microscope (A) and a portable Raman spectrometer (B). The spectra shown were obtained from a clean orange skin (a), an orange skin contaminated with parathion (b), and an orange skin contaminated with parathion and then modified by addition of Au@SiO2 NPs (c). The Raman spectrum of solid parathion is provided for comparison (d).
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One-pot synthesis of hierarchical Ag mesoparticles with tunable morphology for ultrasensitive surface-enhanced Raman scattering activity
Journal of Vacuum Science & Technology B (2019)