2022
DOI: 10.1002/adom.202102238
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Light‐Induced Solid‐State Protrusion of Gold Nanowires and Their Derivatives for Sensing Applications

Abstract: Traditional methods of synthesizing AuNWs with the assistance of soft/hard templates [7][8][9][10][11][12][13][14][15][16] or self-assembly [17,18] are normally carried out in solution with long reaction time. The ligands/surfactants used during the synthesis significantly degenerates their device performances in the electric conduction, analytes sensitivity, and catalytic activity. Nanowires (NWs) formed via physical vapor deposition or nanolithography is more uniform and ligand-free, but their fabrication co… Show more

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Cited by 6 publications
(6 citation statements)
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References 46 publications
(48 reference statements)
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“…The AuNPs arranged in a ring-shaped pattern is formed by irradiating the Au-doped titanium dioxide (TiO 2 ) films with 446 nm continuous wave (CW) laser, which are confirmed with scanning electron microscope (SEM) and energy dispersive Xray spectroscopy (EDS) characterizations (Figure 1b,c). [27] The Au-doped TiO 2 films appear transparent in the visible (Figure S1a, Supporting Information), and the X-ray photoelectron spectrum (Figure S1b, Supporting Information) indicates the major species of Au in the TiO 2 films are Au(I) and Au(0). These metastable Au(I)/Au(0) species are formed via the reduction with isopropanol during the sol-gel ripening process (see the experimental details), which are stabilized by the TiO 2 matrix.…”
Section: Resultsmentioning
confidence: 99%
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“…The AuNPs arranged in a ring-shaped pattern is formed by irradiating the Au-doped titanium dioxide (TiO 2 ) films with 446 nm continuous wave (CW) laser, which are confirmed with scanning electron microscope (SEM) and energy dispersive Xray spectroscopy (EDS) characterizations (Figure 1b,c). [27] The Au-doped TiO 2 films appear transparent in the visible (Figure S1a, Supporting Information), and the X-ray photoelectron spectrum (Figure S1b, Supporting Information) indicates the major species of Au in the TiO 2 films are Au(I) and Au(0). These metastable Au(I)/Au(0) species are formed via the reduction with isopropanol during the sol-gel ripening process (see the experimental details), which are stabilized by the TiO 2 matrix.…”
Section: Resultsmentioning
confidence: 99%
“…It is hypothesized that the diffusion of Au(0) [30,31] as well as the photodissociation/ablation of the particles at the beam center contributes the formation of ring-shaped arrangement of AuNPs. [32] The rich supply of Au(I)/Au(0) source from the surrounding TiO 2 matrix also promotes the autocatalytic growth of AuNPs at the circumference, [33,34] which further boosts the formation of ring-shaped superstructures (Figure 1f). The size of the particles in the rings can be adjusted by tuning the irradiation power (Figure S4, Supporting Information) and the concentration of the doped Au ions in TiO 2 films, which can form continuous Au nanorings (Figure S5, Supporting Information).…”
Section: Resultsmentioning
confidence: 99%
“…The HCl loading chamber ( 5) is connected to the mixing chamber (6), which is attached to a serpentine siphon (7) that enables efficient mixing. The DCM loading chamber ( 8) is connected to the serpentine siphon through the extraction chamber (9), which directly communicates with the detection chamber (10) This journal is © The Royal Society of Chemistry 2024 used approaches for creating nanostructured microarray wells are the top-down approach, which uses lithographic techniques commonly used in semiconductor processes, [192][193][194] and the bottom-up approach, which harnesses the self-assembly of nanoparticles. [195][196][197] Three-dimensional nanoplasmonic substrates produced using methods like E-beam or photolithography offer the advantage of rapid large-area fabrication and precise control over nanogap distances.…”
Section: Sers-based Microarraysmentioning
confidence: 99%
“…6,7 Electromagnetic enhancement is a well-known mechanism that relies on the interaction between incident light, the molecule, and the nanostructured surface. [8][9][10][11][12][13][14][15] It comprises two key components: localized surface plasmon resonance (LSPR) and hot spots. LSPR involves the interaction of light with metallic nanostructures such as gold (Au) or silver (Ag) to induce the collective oscillation of the surface plasmons, which are the free electrons within the metal.…”
Section: Introductionmentioning
confidence: 99%
“…[12][13][14][15][16][17][18][19] Alternatively, periodic structures that mimic diffraction gratings can also produce iridescent colors if the condition given by Bragg's law is met for visible light. [20][21][22][23][24] Second, altering the chemical composition of a surface without using chemical substances can be achieved using lasers, [25][26][27] as a way to effectively fabricate a highly adhesive thin-film that will give rise to colors via interferometric effects, hence modifying the reflectance spectrum of the metal. Oxide layers constitute one of the most suitable options for the production of thin-films on copper, for it is well-known that this metal easily oxidizes and produces robust, long-lasting oxide layers.…”
Section: Introductionmentioning
confidence: 99%