Fabrication of Au Nanoparticle Arrays on Flexible Substrate for Tunable Localized Surface Plasmon Resonance

Abstract

In this work, Au nanoparticle (AuNP) arrays on shape memory polyurethane (SMPU) substrates serve as flexible materials for tunable localized surface plasmon resonance (LSPR). AuNP arrays prepared by diblock copolymer self-assembly are transferred from rigid silicon wafers onto flexible SMPU substrates with ultrasonic treatment rather than peeling off directly. The resultant AuNP array SMPU films have excellent mechanical properties and stable thermodynamic properties. The LSPR arising from AuNP arrays is increased by negative bending on SMPU substrates, whereas the LSPR is decreased by positive bending. Besides, upon uniaxial tension, the vertical LSPR is increased first then decreased, whereas the parallel LSPR is similar, resulting in the overall LSPR of AuNP arrays being increased first and then decreased with the mechanical uniaxial tension of SMPU. Moreover, the resultant AuNP array SMPU films exhibit excellent flexibility, stability, and homogeneity in practical surface-enhanced Raman scattering (SERS) application. This approach of incorporating AuNP arrays on SMPU substrates for tuning plasmonic properties have great potential applications in SERS, fluorescence enhancement, and newly optoelectronic materials.

Tunable Optical Response Based on Au@GST Core–Shell Hetero-nanostructures

“…9,10 According to research, SPP manipulation stimulated by nanoscale metallic structures can be tailored via their size, shape, material composition, and arrangement. 11 Usually, the optical response of plasmonic metallic nanostructures is fixed once its geometrical parameters and material composition are chosen. However, from a practical application point of view, it is important to actively modulate the excitation of SPPs, thus achieving highly desirable and programmable optical responses.…”

“…The unique properties of surface plasmon plasmons (SPPs) with shorter effective wavelength, stronger electromagnetic field localization, and enhancement have drawn enormous interest for routing and manipulating light at nanoscales based on their localized surface plasmon resonance (LSPR) properties. − Especially, the emerging field of steering SPPs on metallic nanostructures opens up an unprecedented opportunity for high-precision SPP manipulation, which shows great potential in optical functionality switching and tuning, such as solar cells, , high-sensitivity biochemical sensors, photocatalysis, and nonlinear optics. , According to research, SPP manipulation stimulated by nanoscale metallic structures can be tailored via their size, shape, material composition, and arrangement . Usually, the optical response of plasmonic metallic nanostructures is fixed once its geometrical parameters and material composition are chosen.…”

Tunable surface plasmon resonance enhanced fluorescence via the stretching of a gold quantum dot-coated aluminum-coated elastomeric grating substrate

“…In this study, the fluorescence intensity of AuQDs was controlled by shifting the SPR-excitation wavelength by stretching an Al-coated PDMS-grating substrate. In this process, not only was the SPR wavelength tuned, as previously reported, 33,34,52,53 but the SPF was also tuned. The SPR-excitation wavelength of the Al-coated PDMS-grating substrate was tuned by changing the incident light angle, from 5° to 60°, and stretching the sample from 0 to 1.0 mm.…”

Shape- and Color-Switchable Polyurethane Thermochromic Actuators Based on Metal-Containing Ionic Liquids

“…Form memory polymers, on the other hand, cannot completely satisfy functional applications. As a result, a growing number of studies are being performed to design various functions for SMPU, such as biodegradability, antibacterial, biocompatibility, electrical conductivity, and self-healing. − Peng and co-workers, for example, created SMPU microfibers with excellent biodegradability and shape memory efficiency by incorporating fabricated poration with hydroxyapatite into the device, resulting in better-controlled drug release . Wang et al proposed a general strategy for producing a crisscross polymer containing polydiacetylene and PU and exhibiting shape memory efficiency and conductivity .…”