Abstract
Worm-like nanorods and nanospheres of silver have been synthesized by photochemical decomposition of silver oxalate in water by UV irradiation in the presence of CTAB and PVP, respectively. No external seeds have been employed for the synthesis of Ag nanorods. The synthesized Ag colloids have been characterized by UV-visible spectra, powder XRD, HRTEM, and selected area electron diffraction (SAED). Ag nanospheres of average size around 2 nm have been obtained in the presence of PVP. XRD and TEM analyses revealed that top and basal planes of nanorods are bound with {111} facets. Williamson–Hall plot has revealed the presence of defects in the Ag nanospheres and nanorods. Formation of defective Ag nanocrystals is attributed to the heating effect of UV-visible irradiation.
Highlights
Silver nanoparticles have been known for the variety of applications in various fields such as catalysis, electronics, optics, medicine, and environment
Ag nanorods have been synthesized by arc discharge technique [11], polyol process [12], hard template synthesis using porous materials such as mesoporous silica [13], and carbon nanotubes [14], using surfactants such as cetyl trimethyl ammonium bromide (CTAB) [15], sodium dodecyl sulfonate [16], and dodecyl benzene sulfonic acid sodium (DBS) [17], seedmediated [15] and seedless, and surfactantless wet chemical approach [18]
Synthesis of Ag nanoparticles from silver oxalate by thermal and microwave-assisted decomposition has been reported, as temperature needed for the decomposition of silver oxalate is as low as 140 °C [19, 20]
Summary
Silver nanoparticles have been known for the variety of applications in various fields such as catalysis, electronics, optics, medicine, and environment. A fast synthesis of Ag nanospheres and nanorods by UV irradiation of silver oxalate in the presence of poly (vinyl pyrrolidone) (PVP) and cetyl trimethyl ammonium bromide (CTAB) as capping agents has been demonstrated. This single sharp SPR band indicates the presence of spherical Ag nanoparticles with average size below 10 nm in the colloid [19].
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