Abstract
Abstract Regulation of hot spots exhibits excellent potential in many applications including nanolasers, energy harvesting, sensing, and subwavelength imaging. Here, hat-shaped hierarchical nanostructures with different space curvatures have been proposed to enhance hot spots for facilitating surface-enhanced Raman scattering (SERS) and plasmon-driven catalysis applications. These novel nanostructures comprise two layers of metal nanoparticles separated by hat-shaped MoS2 films. The fabrication of this hybrid structure is based on the thermal annealing and thermal evaporation of self-assembled polystyrene spheres, which are convenient to control the metal particle size and the curvature of hat-shaped nanostructures. Based on the narrow gaps produced by the MoS2 films and the curvature of space, the constructed platform exhibits superior SERS capability and achieves ultrasensitive detection for toxic molecules. Furthermore, the surface catalytic conversion of p-nitrothiophenol (PNTP) to p, p′-dimercaptobenzene (DMAB) was in situ monitored by the SERS substrate. The mechanism governing this regulation of hot spots is also investigated via theoretical simulations.
Highlights
Raman spectra are generated by inelastic light scattering caused by molecular vibrations and can offer fingerprint information for molecular analysis [1]
The AgNPMAuH samples obtained from the 300 nm, 700 nm, and 900 nm PS spheres have been depicted in Figure S3 A–C We note that the AgNPM-AuH morphologies of different sizes are almost the same
There is an annular groove area around the brim, where a large space curvature is formed with two-layered metal nanoparticles; the regulation of hot spots can be realized based on the space curvature
Summary
Raman spectra are generated by inelastic light scattering caused by molecular vibrations and can offer fingerprint information for molecular analysis [1]. The poor structural maneuverability of low-dimensional metal nanostructures limits the generation of high-density hot spots, which restricts further improvement of the sensitivity of SERS. The local electric field enhancement of hot spots is extremely sensitive to the interval size (
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