Tuning Metamaterials Nanostructure of Janus Gold Nanoparticle Film for Surface-Enhanced Raman Scattering

Abstract

Large-area metamaterial nanostructures of a Janus gold nanoparticle (AuNP) film decorated with thiolterminated polymers have been fabricated and tuned at an oil/ water interface by a facile and innovative process. The results show that AuNPs had been arrayed with ultrasmall gaps between neighboring particles laminated with polymer which is called a Janus film. This film exhibits a sensitive property for surface-enhanced Raman scattering (SERS) for determination of both hydrophilic methylene blue and hydrophobic thiram. The structure-dependent SERS of the Janus AuNP film has also been confirmed by a finite-difference time domain (FDTD) method.

Self-assembly of colloidal nanoparticles into 2D arrays at water–oil interfaces: rational construction of stable SERS substrates with accessible enhancing surfaces and tailored plasmonic response

“…An alternative method of reducing the charge on nanoparticles so that they self-assemble into densely packed arrays at wateroil interfaces is to add a third co-solvent, typically ethanol, as shown in Figure 3a. [44][45][46] This method is arguably the most popular method for producing 2D nanoparticle arrays for SERS since it has been shown to be effective for different types of Ag/Au nanoparticles and does not involve the use of strongly adsorbing modifiers. Despite its widespread use, the detailed mechanism for this self-assembly process has remained elusive.…”

Plasmonic Sensors Based on Funneling Light Through Nanophotonic Structures

“…Plasmonic sensors are used as refractometers for the identification and characterization of chemicals [1], gases [2], and biomaterials [3]. The excitation of surface plasmon resonances at the metal/dielectric interface is reinforced and favored by the use of photonic nanostructures [4] and nanoparticles [5,6]. Some of these designs allow normal incidence conditions that help its integration with optical fibers and avoids angular interrogation [7,8].…”

“…and favored by the use of photonic nanostructures [4] and nanoparticles [5,6]. Some of these designs allow normal incidence conditions that help its integration with optical fibers and avoids angular interrogation [7,8].…”

Control of Silver Coating on Raman Label Incorporated Gold Nanoparticles Assembled Silica Nanoparticles

“…Surface-enhanced Raman scattering (SERS) has been widely used for various applications due to its excellent ultrasensitive molecular fingerprinting, and its non-destructive and photostable properties [1,2,3,4,5]. Much effort has been focused on the use of different nanoparticles (NPs) as a substrate for SERS detection, such as silver NPs [6,7], gold NPs [8,9,10,11], and metal-embedded graphene oxide [12,13]. Although these nanostructures can enhance the SERS signal, difficulty in controlling the density of hot spots on the surface of a SERS substrate makes them unsuitable for accurate quantitative SERS assays [14].…”