Abstract
Silver nanodecahedrons were successfully synthesized by a photochemical method under irradiation of blue light-emitting diodes (LEDs). The formation of silver nanodecahedrons at different LED irradiation times (0–72 h) was thoroughly investigated by employing different characterization methods such as ultraviolet–visible spectroscopy (UV–Vis), transmission electron microscopy (TEM), and Raman spectroscopy. The results showed that silver nanodecahedrons (AgNDs) were formed from silver nanoseeds after 6 h of LED irradiation. The surface-enhanced Raman scattering (SERS) effects of the synthesized AgNDs were also studied in comparison with those of spherical silver nanoparticles in the detection of 4-mercapto benzoic acid. Silver nanodecahedrons with a size of 48 nm formed after 48 h of LED irradiation displayed stronger SERS properties than spherical nanoparticles because of electromagnetic enhancement. The formation mechanism of silver nanodecahedrons is also reported in our study. The results showed that multihedral silver nanoseeds favored the formation of silver nanodecahedrons.
Highlights
Silver nanomaterials have gained much attention due to their various applications in the areas of electronic and sensor engineering, catalysis, biomedicine, and surface-enhanced Raman scattering (SERS) [1,2]
In their study,ofAgNDs using a photochemical method based on irradiation by light-emitting diodes (LEDs) for a better control were synthesized via two steps: firstly, the synthesis of 3 nm spherical AgNPs with the optical of their shape gained attention of 455 the nm firstblue researchers to study AgNDs were reductive agenthas
The ultraviolet–visible spectroscopy (UV–Vis) results in Figure 2 show the formation of silver nanoseeds which presented an absorption peak at 400 nm
Summary
Silver nanomaterials have gained much attention due to their various applications in the areas of electronic and sensor engineering, catalysis, biomedicine, and surface-enhanced Raman scattering (SERS) [1,2]. Silver nanoplates (AgNPs) and silver nanodecahedrons (AgNDs) have been studied because of their localized surface plasmon resonance in a longer wavelength region. The synthesis of AgNDs a photochemical basedSoon irradiation by been synthesized by a(LEDs) chemical using hydrazine as a reductive agent andattention trisodium citrate as light-emitting diodes for method a better control of their shape has gained much [3,4,6,7,8,9,10]. In their study,ofAgNDs using a photochemical method based on irradiation by light-emitting diodes (LEDs) for a better control were synthesized via two steps: firstly, the synthesis of 3 nm spherical AgNPs with the optical of their shape gained attention of 455 the nm firstblue researchers to study AgNDs were reductive agenthas. 2.bonds, Materials and Methods enhancing the SERS effects [12,13,14]
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