Synthesis of gold and silver nanoparticles by electron irradiation at 5–15 keV energy

Abstract

Thin coatings (∼10 µm) made from a mixture of polyvinyl alcohol (PVA) and HAuCl(4) or PVA and AgNO(3) on quartz plates were irradiated with 5-15 keV electrons, at room temperature. The electron energy was varied from coating to coating in the range of 5-15 keV, but electron fluence was kept constant at ∼10(15) e cm(-2). Samples were characterized by the UV-vis, XRD, SEM and TEM techniques. The plasmon absorption peaks at ∼511 and ∼442 nm confirmed the formation of gold and silver nanoparticles in the respective electron-irradiated coatings. The XRD, SEM and TEM measurements reveal that the average size of the particles could be tailored in the range of 130-50 nm for gold and from 150-40 nm for silver by varying the electron energy in the range of 5-15 keV. These particles of gold and silver embedded in the polymer could also be separated by dissolving the coatings in distilled water.

Synthesis, characterisation and antibacterial activity of PVA/TEOS/Ag-Np hybrid thin films

“…Incorporation of silver nanoparticles in PVA polymer matrix could provide antibacterial activity, which is highly desirable in medical field. Various methods including solvent evaporation, electron radiation, UV light, thermal annealing, and in situ chemical reduction have been proposed for the synthesis of materials based on PVA/silver nanoparticles [17][18][19][20][21][22][23][24][25][26][27][28] which yields different morphology and sizes of silver depending on the preparation method. PVA is very sensitive towards moisture and as a result reduces the film strength [16] that is highly undesirable of the films used for biomedical applications.…”

Optical and Structural Properties of PVA Capped Gold Nanoparticles and Their Antibacterial Efficacy

“…It is well known that the bonds of polymer matrices are broken on irradiation with electrons which leads to liberation of electrons and hydrogen gas from polymer matrix. 48 Initially, the polymer forms complexes with Au(III) ions, thus changing the rate of nucleation and growth of nanoparticles. As a result dispersion of the colloids is obtained.…”

Influence of the temperature on the nucleation of silver nanoparticles in Tm3+/Yb3+ codoped PbO–GeO2 glasses

“…The nucleation and growth of quantum dots [4], and the exploitation of plasmonic effects in metallic nanoparticles (NPs) are examples of photonic applications of current interest [1,2,[5][6][7]. In the case of metallic NPs several methods have been reported in the literature such as the use of electron beam, femtosecond laser, ultra-violet irradiation, and heat-treatment [7][8][9][10][11][12][13].…”