Abstract
Abstract Gold nanoparticles (Au NPs) have a wide range of applications because of their localized surface plasmon resonance properties. Femtosecond laser is considered to be an effective method for preparing Au NPs because of its characteristics of ultrashort irradiation periods and ultrahigh intensities. In this study, a novel method is proposed to produce an Au NP-attached substrate using the spatially and temporally shaped femtosecond laser. Laser-induced periodic surface structures (LIPSS) are designed to obtain the localized optical field enhancement, which leads to the femtosecond laser spatially reshaping, enabling the deposition of Au NPs by photoreduction on silicon substrates. The Au NPs prepared by this method exhibit morphological controllability and chemical stability, especially excellent spatial selectivity and uniformity, resulting in the tunable and stable surface-enhanced Raman scattering (SERS) applications. Also, the temporally shaped femtosecond pulses are introduced to further increase the enhancement factors of the SERS. This method successfully achieves the controllable morphology synthesis and selective deposition of Au NPs on the substrate simultaneously, which provides a promising candidate for SERS substrates fabrication, and holds potential applications in optoelectronics, such as molecular detection and biosensors.
Highlights
Noble metal (e.g. gold (Au), platinum, and silver) nanoparticles (NPs) exhibit more favorable plasmon-dominated optical properties than conventional bulk metal because of the resonance of conduction electrons with the incident light [1,2,3]
The finite difference time domain (FDTD) was used to simulate optical fields, which demonstrated the existence of localized optical field enhancement (LOFE)
Au NP-attached substrates with various particle morphologies and spatial distributions were used for surface-enhanced Raman scattering (SERS) detection, which performed sensitive and tunable activity under the synergistic effect of physical enhancement and chemical enhancement: The enhancement factors (EFs) can be further improved to 4.3 × 107 by introducing temporally shaped femtosecond laser, and the Au NPattached substrates exhibit excellent chemical stability with the intensity deviation of 5.3% in the atmosphere for 2 months
Summary
Noble metal (e.g. gold (Au), platinum, and silver) nanoparticles (NPs) exhibit more favorable plasmon-dominated optical properties than conventional bulk metal because of the resonance of conduction electrons with the incident light [1,2,3]. Au NP-attached substrates with various particle morphologies and spatial distributions were used for SERS detection, which performed sensitive and tunable activity under the synergistic effect of physical enhancement and chemical enhancement: The enhancement factors (EFs) can be further improved to 4.3 × 107 by introducing temporally shaped femtosecond laser, and the Au NPattached substrates exhibit excellent chemical stability with the intensity deviation of 5.3% in the atmosphere for 2 months. This new method facilitates the efficient, lowcost, and mask-free manufacturing of SERS substrates. This new method provides a new strategy to fabricate Au NP-attached SERS substrate and holds great potential application in molecular detection and biosensors
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