Metal nanocomposite films prepared in situ from PVA and silver nitrate. Study of the nanostructuration process and morphology as a function of the in situ routes

Abstract

Cast‐hybrid films composed of polyvinyl alcohol (PVA) and silver nitrate were treated according to three different ways, thermal annealing, UV‐irradiation, and chemical reduction by a borohydride solution, to obtain PVA/silver nanocomposite films. The nanostructuration process was studied as a function of the treatment conditions, and discussed as a function of the mobility state of the polymer chains in the nanocomposite matrix during treatment. A homogeneous dispersion of crystalline silver nanoparticles was obtained by thermal annealing above Tg and below Tm and UV‐lamp irradiation below Tg. For these two treatments, the major processing parameters were the annealing temperature and time and the UV‐exposure time, respectively. For low‐conversion rate in Ag(0), the films evolved upon ageing at room temperature. Totally different morphology and Ag(0) conversion were achieved by chemical reduction in a borohydride solution. All the silver ions were reduced into Ag(0), and crystalline silver nanoparticles layers parallel to the film surface were observed after the treatment. This morphology was related to the high‐swollen state of the polymer matrix during treatment. © 2008 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 46: 2062–2071, 2008

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

“…X-ray diffraction patterns (Fig. 7) of the studied hybrid materials show the appearance of strong diffraction peak centered at 19°of 2h which is attributed to the PVA crystalline phase [18]. Two weak diffraction peaks at 2h equal to 38°and 42°are observed and they are attributed to the (1 1 1) and (2 0 0) Bragg reflections of the face-centerd cubic (fcc) structure of metallic silver, which confirms the formation of metallic silver nanoparticles [39].…”

“…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.…”

Nanocomposite membranes of polyetherimide nanostructured with palladium particles: Processing route, morphology and functional properties

“…Depending on the polymer/metal precursor system, different ways can be used to obtain the metal ion reduction. The most common way consists in using an external reducing agent and the final morphology is often a homogeneous dispersion of metal nanoparticles within the polymer matrix [4,8,9,22,23]. Thermal annealing has also been reported as an efficient way to obtain polymer embedded metal nanoparticles for some polymer/metal complex systems [3,5,10,[24][25][26][27][28].…”

“…These materials are in particular of great interest in optical [1][2][3][4][5], magnetics [6,7] and catalysis domains [8][9][10][11][12][13][14][15][16][17][18].…”

Thermal and Optical Properties of Silver-Polyimide Nanocomposite Based on Diphenyl Sulfone Moieties in the Main Chain

“…Nanoscale metal particles such as silver represent promising functional fillers due to their specific electronic, optical, magnetic, catalytic, and antimicrobial properties. [3][4] Two major methods used to prepare the metal-polymer nanocomposite materials are dispersion of separately prepared colloidal metal nanoparticles in the polymer matrix [5][6] and colloidal metal nanoparticles generated inside the polymer matrix from metal salts and complexes. [7][8] The later approach has been more frequently employed in recent years.…”