Plasmon-enhanced nanosoldering of silver nanoparticles for high-conductive nanowires electrodes

Abstract

The silver nanowires (Ag NWs) electrodes, which consist of incompact Ag nanoparticles (NPs) formed by multi-photon photoreduction, usually have poor conductivities. An effective strategy for enhancing conductivity of the Ag NWs electrodes is plasmon-enhanced nanosoldering (PLNS) by laser irradiation. Here, plasmon-enhanced photothermal effect is used to locally solder Ag NPs and then aggregates of these NPs grow into large irregular particles in PLNS process. Finite element method (FEM) simulations indicate that the soldering process is triggered by localized surface plasmon-induced electric field enhancement at "hot-spots". The effectiveness of PLNS for enhancing conductivity depends on laser power density and irradiation time. By optimizing the conditions of PLNS, the electrical conductivity of Ag NWs is significantly enhanced and the conductivity σ s is increased to 2.45×10 7 S/m, which is about 39% of the bulk Ag. This PLNS of Ag NWs provides an efficient and cost-effective technique to rapidly produce large-area metal nanowire electrodes and capacitors with high conductivity, excellent uniformity, and good flexibility.

Janus aramid nanofiber aerogel incorporating plasmonic nanoparticles for high-efficiency interfacial solar steam generation

“…Next, the top surface of the gel is uniformly sprayed with Au nanoparticle suspension (Fig. 1(d)), which is synthesized using a typical citrate reduction method 47 . The aramid nanofibers and Au nanoparticles are mutually combined based on the hydrogen bondings between the amide groups of aramid and the carboxylic acid groups of the citrates coated on Au nanoparticles.…”

Strategies and Challenges of Identifying Nanoplastics in Environment by Surface-Enhanced Raman Spectroscopy

“…Signal enhancement of metal nanoparticles relies mainly on conventional hot spots (that is, the near-field effect of LSPR) and chemical enhancement. The enhancement region is limited to the nearby surface of the structure (∼1–10 nm), which limits the detection of particles of various sizes. , Nanoarray substrates with PIC structures combine a “volume hot spot” (inside the cavity) and a “surface hot spot” (on the surface of the nanostructure), extending the effective area of the conventional local electric field in SERS structures and facilitating the detection of particulate targets (Table ). Substrate stability and interference resistance.…”

Plasmonic Coupling of Au Nanoclusters on a Flexible MXene/Graphene Oxide Fiber for Ultrasensitive SERS Sensing

“…In recent decades, the sustainable and scalable fabrication of surface-enhanced Raman scattering (SERS) substrates with high sensitivity and stability has been critical for the detection and imaging of analytes for applications in food safety, national defense, environmental monitoring, biological and biomedical fields, and many more. − To achieve a high-performance SERS substrate, a variety of novel materials ranging from noble metals (such as Au, Ag, and Cu), − ,− crystal/amorphous semiconductors, − and metal–organic frameworks to two-dimensional (2D) materials (e.g., graphene, boron nitride, and transition-metal carbides and/or nitrides (MXenes) − and transition-metal chalcogenides (TMDs)) have been successively explored since their discovery in 1974 by Fleischmann et al Among these materials, plasmonic structures assembled from Au or Ag nanoparticles have been substantially studied due to their ability to generate a localized surface plasmon resonance (LSPR) excited by an incident light on the plasmonic nanostructure, which occurs by an electromagnetic mechanism (EM) for SERS enhancement. , However, spontaneous aggregation and random dispersion of noble-metal nanoparticles lead to more than 50% signal fluctuation during detection at different times, which is almost impossible to use for quantitative analysis. , To address these challenges, emerging strategies have shifted from monodisperse noble-metal nanoparticles to the construction of large-area and highly SERS active nanoparticles via chemical modification or lithography techniques on the surface of rigid (e.g., silicon, quartz, glass) , or flexible materials , in a controlled way.…”