Assembly and Characterization of Polyurethane–Gold Nanoparticle Conjugates

Abstract

The PU/Au-NPs conjugates based on poly(vinyl alcohol)-containing polyurethane microparticles coated with Au-NPs are prepared by a heat-treated method. The PU/Au-NPs conjugates are characterized by FT-IR , SEM, TEM analysis. The appearance of characteristic peaks in the FT-IR spectra at 1574 and 1624 cm − 1 , which are attributed to urethane groups, are presented for both PU and PU/Au-NPs conjugate. The absorption band at 1716-1718 cm − 1 , attributed to the hydrogen-bonded urethane carbonyl groups of PU/Au-NPs (13nm) -A is higher than that obtained for unmodifi ed PU. The Au-NPs (13nm) are found to be well dispersed in the PU. The Au-NPs (3.5nm) tend toward agglomeration when they are entrapped within PU. It is determined, that Au-NPs present in PU-Au conjugates quench the luminescence of PU.

Polyurethane-gold and polyurethane-silver nanoparticles conjugates for efficient immobilization of maltogenase

“…%) solution using initial molar ratio of PVA and HMDI 1:5, according to previously published protocols [10,40]. …”

“…The average number of silver atoms located on the surface of nanoparticle (Nout) was calculated using the previously reported Equation 2 [10,42,43].…”

“…Polymers such as polyaniline, polystyrene, glycopolymers of polyacrylamide derivatives with mannose, poly(sodium 4-styrenesulfonate), polyurethane (PU) were modified by Au-NPs and Ag-NPs [10,[29][30][31][32][33][34][35]. Novel and feature properties of modified polymers were observed.…”

“…It is well known, that Au-NPs show good biostability and biocompatibility for biological systems [18]. The unique electrical properties of Au-NPs as well as their optical and photophysical features, such as size-controlled plasmon absorbance, photonic electron-hole pair generation and fluorescence were studied by means allowing detection of both electronic [10,19] and photonic signals [10,20]. Conversely, the Ag-NPs show high antimicrobial activity [21].…”

“…One of most popular method of Au or Ag nanoparticles (Au-NPs or Ag-NPs) synthesis is reduction of gold or silver salt by various reducing agents such as sodium borohydride, sodium cianoborohydride, thiocyanate, ascorbic acid, aspartic acid, aminodextran, sodium citrate, citrate/tannic acid, elemental hydrogen [10][11][12][13][14][15][16]. The reduction of Ag (I) or Au (III) ions leads to the formation of Ag (0) or Au (0), which is followed by agglomeration into oligomeric clusters.…”