Preparation of Ag/PVP Nanocomposites as a Solid Precursor for Silver Nanocolloids Solution

Hong, Hyun-Ki; Park, Chan-Kyo; Gong, Myoung‐Seon

doi:10.5012/bkcs.2010.31.5.1252

Cited by 31 publications

(5 citation statements)

References 27 publications

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“…The diffraction peaks at 2θ equal to 38.883˚, 45.070˚, 65.191˚, 78.0860 are in good agreement with the literature values of metallic silver [18] [19]. The average grain size (D) of silver can be determined using Debye Scherrer's relation:…”

Section: X-ray Diffraction Studiessupporting

confidence: 84%

Synthesis and Characterization of Ag/PVP Nanocomposites by Reduction Method

Krishnan¹,

Sobha²,

Balakrishnan³

et al. 2014

OALib

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A polyvinylpyrrolidone (PVP)/Ag nanocomposite was prepared by reduction of silver nitrate in ethylene-glycol in the presence of a polymeric protective agent (i.e., poly (N-vinylpyrrolidone)). The size dependent color variation of this nanocolloid is a clear indication of the presence of Ag as nanoparticles in the polymer matrix. The nonlinear optical properties were studied by Z-scan technique in which a Q-switched Nd: YAG laser with a pulse width of 7 ns at 532 nm was used as the source of light. Z scan measurement shows that Ag/PVP exhibits third order Nonlinear Optical effects. The peak-valley curve from closed aperture measurement indicates the self-defocusing process. The third order nonlinear optical parameters n2, β, χ 3 are found to be of the orders of 10 −9 esu, 10 −9 m/W, 10 −11 esu respectively. The very strong Plasmon resonance peak at 419 nm was observed and is a clear consequence of the nanosize of dilute Ag particles. The optical band gap of this nanomaterial was calculated as 2.535 eV. The XRD pattern indicates the presence of crystalline Ag and the average grain size was obtained as 17.4 nm. The SEM micrograph confirms this observation. Thermal Gravimetric Analysis implies that Ag/PVP nanocomposite exhibits high degree of thermal stability.

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Section: X-ray Diffraction Studiessupporting

confidence: 84%

Synthesis and Characterization of Ag/PVP Nanocomposites by Reduction Method

Krishnan¹,

Sobha²,

Balakrishnan³

et al. 2014

OALib

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“…Also, interaction between PVP and cotton was observed by Selvam and Sundrarajan (2012). Additionally, Hong et al (2010) observed broadened and shifted C=O stretching bands of the silver/PVP nanocpomosite compared to the PVP powder band. This was associated with the formation of a coordination bond between the silver and oxygen atoms in the C=O group.…”

Section: Surface Analysismentioning

confidence: 82%

Investigation on functionalization of cotton and viscose fabrics with AgNWs

et al. 2016

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A study on the functionalization of cotton and viscose fabrics to achieve bifunctional conductive and antibacterial properties was carried out; 0.5 wt% AgNW ethanolic colloid was prepared, and fabrics were dipped and dried in the colloid 1, 10 and 15 times. After one dipping, both fabrics remained nonconductive, and the surface resistance (R s ) of cotton was 4.9 9 10 10 and of viscose 3.6 9 10 11 X. Excellent conductivity properties were shown in cotton fabric after 10 dippings (20 X) and in viscose fabric after 15 dippings (46 X). The Ag content of these fabrics was 53.3 and 52.3% (SEM/EDX analysis) and 13.77 and 14.12% (TG/DTG analysis) for cotton and viscose, respectively. XRD analysis revealed the presence of AgNWs on the fabric surface. FTIR/ATR, Raman and TG analysis confirmed the effects of modifications. The AgNW layers on both fabric surfaces were resistant to abrasion. After 50 washes of the modified cotton fabric, R s increased from 20 to 195 X. The AgNW layer was stable and the fabric still highly conductive. However, viscose fabric became nonconductive after two washes, and the surface resistance increased from 46 to 1.4 9 10 11 X. The tensile strength of cotton modified with AgNWs increased by about 49% and for viscose decreased by about 27%. AgNW-modified cotton fabric showed a significant antibacterial effect against S. aureus and K. pneumoniae bacteria. The presented method is more suitable for cotton because the modified cotton fabric retains the mechanical and conductive properties even after many washes.

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“…Considerable enhancement in the nonlinear refractive index may be attributed to the thermally induced lensing effect in PVP-GNP thin lms. 54,55 The electrons with energy higher than the Fermi energy are called hot electrons. These hot electrons dissipate their excess energy through the scattering process.…”

Section: Nlo Studies Of Colloidal Gnps and Gnp-pvp Nanocompositesmentioning

confidence: 99%