LSPR‐Induced Catalytic Enhancement Using Bimetallic Copper Fabrics Prepared by Galvanic Replacement Reactions

Abstract

A simple galvanic replacement (GR) reaction‐based strategy to create copper‐based bimetallic fabrics for photoreductive catalysis is reported. It is shown that a nanostructured Cu@Fabric can be easily converted into bimetallic Cu‐Au@Fabric and Cu‐Ag@Fabric through a spontaneous electroless process that involves simple exposure of copper fabrics to the aqueous solutions of gold and silver ions. The nanoscale hierarchical ordering of cotton fabrics combined with their high porosity and wettability make them outstanding supports for catalyst recovery and reusability. The deposition of miniscule quantities of expensive noble metals on readily available Cu not only reduces the overall catalyst cost, but also plays a major role in improving the catalyst stability and reusability over several cycles through minimizing Cu oxidation. The synergistic effects of the localized surface plasmon resonance (LSPR) properties of Cu, Au, and Ag allow these bimetallic fabrics into highly active visible light photocatalysts. Mechanistic investigation of the photocatalytic activity provides in‐depth information on the electron transfer processes occurring at the catalyst/ reactant interface, revealing electron transport as the rate‐limiting step, which could be overcome under visible light photoillumination conditions. The outcomes enhance the understanding of template‐supported bimetallic nanostructures for LSPR‐induced photocatalysis applications, offering new potential to design multifunctional fabrics for various applications.

Photomodulated Spatially Confined Chemical Reactivity in a Single Silver Nanoprism

“…In recent years, plasmon-driven enhancement of chemical reactivity has become an area of active investigation. ,,, While the LSPR eigenmodes within a particle can now be regularly probed using electron energy loss spectroscopy (EELS), − visualizing the spatially confined subparticle chemical reactivity is highly challenging. Thus, most of the plasmon-enhanced catalysis studies simply investigate the chemical reaction outcomes in bulk solutions on photoexcitation. , In a notable work, Maier’s group could probe the above LSPR-induced chemical transformation of 4-NTP to 4-ATP on Ag nanoantennas with a 15 nm resolution (using electron microscopy) by covalently conjugating 15 nm Au nanoparticles selectively on the locations where chemical transformation of 4-NTP to 4-ATP took place . Other relevant studies that have investigated the influence of plasmon excitation on reaction site selectivity include use of polarized light to deposit PbO 2 on Au nanocuboids to form chiral particles, selective deposition of PbO 2 on the tips of Au nanorods, site-selective etching of Ag nanocubes deposited on the TiO 2 surface, and selective deposition of organic diazonium salts on the tips of a Au nanoprism …”

A novel cellulosic non‐enzymatic nanosensor based on carbon shell silver (Ag@C) nanoparticles for colorimetric detection of Chlorpyrifos in agricultural products

“…The UV-Vis spectra of AgNPs commonly exhibit a characteristic peak at 420 nm due to their strong surface plasmon resonance (SPR) effect. [27][28][29][30][31][32] The absorption and scattering characteristics of AgNPs can be altered by varying the particle size, shape, or refractive index near their surface. A noticeable blue shift compared with AgNPs absorption maxima is credited to C-shelling and a decrease in particle size, while a sharp peak intensity is attributed to the stability of nanoparticles.…”

“…The optical properties of the prepared nanomaterial were studied by UV–Vis spectroscopy (Figure 1a). The UV–Vis spectra of AgNPs commonly exhibit a characteristic peak at 420 nm due to their strong surface plasmon resonance (SPR) effect 27‐32 . The absorption and scattering characteristics of AgNPs can be altered by varying the particle size, shape, or refractive index near their surface.…”

Advances in Nanozymes as a Paradigm for Viral Diagnostics and Therapy

“…They can be synthesized through various methods, including thermal decomposition (Toshima and Yonezawa, 1998), microwave (Toshima and Yonezawa, 1998), seeded growth (Chen et al, 2013), co-reduction (Toshima and Yonezawa, 1998), and galvanic displacement (Bansal et al, 2008;Xia et al, 2013;Anderson et al, 2019;Bhanushali et al, 2020) nanozyme was fabricated for colorimetric glucose detection in urine using the galvanic displacement method, where Cu was used as a sacrificial template to enhance the ambient stability of the nanozyme (Naveen Prasad et al, 2022).…”