Rapid, large-scale, sonochemical synthesis of 3D nanotextured silver microflowers as highly efficient SERS substrates

Sonochemically synthesized Ag nanoparticles as a SERS active substrate and effect of surfactant

“…Also, the actual surface concentration was higher because analytes were immersed in solution for 24 h, suggesting that the detection limit is primarily dependent on the adsorption of the analyte on the NPs [22]. This study, however, use colloidal solution as a SERS active substrate which is not as stable as an immobilized structure, since an immobilized nanostructure on a solid support is less prone to aggregation [23].…”

Engineering of SERS Substrates Based on Noble Metal Nanomaterials for Chemical and Biomedical Applications

“…Most 3D SERS substrates considered here are hierarchical assemblies fabricated using wet chemical methods, and these structures have numerous cavities, interstitial sites, and void spaces that are known to generate enhanced electric field upon excitation and thus lead to surface-enhanced Raman scattering (110)(111)(112). A newly modified sonochemical strategy has been reported to prepare 3D silver microflowers ( Figure 11) without using any surfactants and/or organics, in which the size and shape could be tuned by varying the reaction parameters (113). The rough particles show a higher SERS performance, compared to the smooth ones, and their activity is size dependent (with the SERS enhancement increasing with particle size).…”

Seed-mediated synthesis and structural analysis of hierarchical silver microparticles (HiAgMPs) with highly nanotextured surfaces

“…In particular, hierarchical silver microparticles with nanostructured surfaces (HiAgMPs), also known as 'silver microflowers,' have attracted growing attention owing to their unique chemical and physical properties for surfaceenhanced Raman scattering (SERS) substrates [7][8][9][10][11]. They are also an excellent catalyst for reductive reactions, and also efficient building blocks for superhydrophobic films [10,12,13].…”

“…They are also an excellent catalyst for reductive reactions, and also efficient building blocks for superhydrophobic films [10,12,13]. To date, the aqueous synthesis of HiAgMPs has been reported to employ a variety of materials such as organic acids [11,13,14], and polyvinylpyrrolidone (PVP) [8,9,15,16], as well as various methods such as ultrasonication [7,17], photochemical reduction [10], and galvanic exchange [13]. In spite of the thorough investigation of the syntheses and applications, however, the synthetic mechanism and the full characterization of their internal structures have not been clearly studied yet.…”