Synergistic Modulation of Surface Interaction to Assemble Metal Nanoparticles into Two‐Dimensional Arrays with Tunable Plasmonic Properties

Abstract

A simple strategy based on the synergistic modulation of inter-particle and substrate-particle interaction is applied for the large-scale fabrication of two-dimensional (2D) Au and Ag nanoparticle arrays. The surface charge of the substrate is used to redistribute the double layer electric charges on the particles and to modulate the inter-particle distance within the 2D nanoparticle arrays on the substrate. The resultant arrays, with a wide range of inter-particle distances, display tunable plasmonic properties. It can be foreseen that such 2D nanoparticle arrays possess potential applications as multiplexed colorimetric sensors, integrated devices and antennas. Herein, it is demonstrated that these arrays can be employed as wavelength-selective substrates for multiplexed acquisition of surface-enhanced Raman scattering (SERS) spectra. This simple one step process provides an attractive and low cost strategy to produce high quality and large area 2D ordered arrays with tunable properties.

Colorimetric Detection of Creatinine Based on Plasmonic Nanoparticles via Synergistic Coordination Chemistry

“…Keeping in mind the aforementioned considerations, colorimetric detection constitute one of best candidates for portable and equipment‐free assays, which is widely applied both in laboratories and our daily lives due to its simpleness, convenience, and efficiency in determining target by obvious color changes. Colorimetric assay based on plasmonic nanoparticles (NPs), especially gold NPs (AuNPs), is particularly superior and attractive due to their unique chemical, physical, and optical properties (e.g., surface plasmon resonance (SPR)) . Hence, AuNPs supply a rapid, efficient, cost‐effective, and robust platform for studying different chemical and bio‐markers, such as DNA, enzymes, (bio)molecules as well as metal ions and anions, without compromising on good stability, low toxicity, and easy functionalization …”

Monitoring pattern formation in drying and wetting dispersions of gold nanoparticles by ESEM

“…44,45 Zeta-potentials of GNPs were measured as a function of nickel perchlorate concentration, using a Zetasizer Nano Z instrument (Malvern Instruments Ltd.). By slowly evaporating the solution in the ESEM, it is possible to monitor the effect of a wide range of surface salt concentrations on GNP pattern formation.…”

Modulating the Kinetics of Nanoparticle Adsorption for Simple and High‐Yield Fabrication of Plasmonic Heterostructures as SERS Substrates

“…In one way,t his behavior is similar to the previously reported reduced inter- ChemPhysChem 2017ChemPhysChem , 18,2114ChemPhysChem -2122 www.chemphyschem.org particled istances between immobilized gold NPs when the salt concentrationisincreased to screen the electrostatic repulsion mediated by the citrates. [38] Heterostructures of gold NPs exhibit ah ighly suitable platform for SERS studies. Ramans pectra of rhodamine 6G placed on top of the heterostructuresw ere investigated by systematically varying the number of cycles used to immobilize the small NPs.…”