Characterization and optical studies of PVP-capped silver nanoparticles

Abstract

In this study, the size-controlled synthesis of silver nanoparticles (Ag NPs) via chemical reduction method by NaBH 4 as a reducing agent and poly(vinyl pyrrolidone) or PVP as a stabilizing agent is reported. Changing of ratios between reducing agent and stabilizing agent relative to AgNO 3 -optimized conditions for synthesis of stable Ag NPs was studied. The formation of Ag NPs was tracked by UV-Vis spectroscopy, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and photoluminescence (PL) spectroscopy. Particle size distribution was studied by particle size analyzer, and the morphology was examined by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The optical properties of the synthesized Ag NPs were also investigated. The optimized Ag NPs were very stable even after 1 month that was due to effective stabilization by PVP molecules. The mechanism of Ag NPs formation and stabilization is discussed in detail.

Preparation of monodispersed and cytotoxic silver nanoparticles using Launaea taraxacifolia leaf extract

“…Reports indicate that plant leaf extracts containing carbohydrate and proteins with amino functional groups serve as reductants to reduce silver ions (Ag + ) to silver nanoparticles (Ag 0 ) [25,26]. Amides, in particular, have been shown to act as reducing and capping agents to obtain AgNPs [27,28].…”

“…The small peak appearing as a shoulder around 3780 cm −1 is considered to be N-H stretching vibration resulting from the presence NH group in the sample [32]. The broad band centred at 3459 cm −1 is attributed to O-H stretching vibration of water molecules or N-H [32], while the sharp peak near 1636 cm −1 is associated with C=O stretching vibration of an amide [27], which is further confirmed by the C-O deformation mode at 1143 cm −1 . The small peak around 1441 cm −1 signifies the presence of C-H bond in [33].…”

The Plasma-Induced Formation of PVP-Coated Silver Nanoparticles and Usage in Water Purification

“…Among all polymer stabilizers of silver nanoparticles, poly(N-vinylpyrrolidone) is considered an excellent dispersant as it exhibits favourable protecting properties owing to its unique structure [17,18]. PVP is a homopolymer with a polyvinyl backbone and its repeating units contain a highly polar amide group that confers hydrophilic and polar-attracting properties, and also nonpolar methylene groups both in the backbone and in the ring that confer hydrophobic properties [19,20]. N and O in the polar groups have a strong affinity for silver ions and silver nanoparticles.…”

“…as a drug carrier, a component of plasma substitute or wound dressing) and technological domains (e.g. in aerosol hair sprays, pigment dispersions, cosmetics) [19][20][21][22][23], in different types of porous composites [24,25]. Therefore, studying the process of obtaining silver nanoparticles in the presence of PVP, used as a stabilizing reagent, under the action of plasma discharge, is of scientific and practical interest.…”

Permutation Entropy as a Parameter of Characterizing the Surface of a Thin Film

“…It also has the highest electrical and thermal conductivity and optical reflectivity of all metals [6]. Some of its applications include optics [7][8][9], nanophotonic [10], flexible transparent electrodes [11], antioxidant [12][13][14], solar cells [15] protein sensors [16], biosensors [17], and fluorescence imaging of single molecules [18]. There are distinct techniques explaining the surface growth of the silver thin films.…”