Formation of silver nanoclusters in transparent polyimides by Ag-K
ion-exchange process |
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Authors: | S Carturan A Quaranta M Bonafini A Vomiero G Maggioni G Mattei C de Julián Fernández M Bersani P Mazzoldi G Della Mea |
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Institution: | (1) Department of Engineering for Innovation, University of Salento, 73100 Lecce, Italy;(2) Department of Engineering for Innovation, Silvertech Ltd, via Monteroni, 73100 Lecce, Italy |
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Abstract: | Silver nanoclusters embedded in two transparent
fluorinated polyimides, 4,4'-hexafluoroisopropylidene diphthalic anhydride –
2,3,5,6-tetramethyl paraphenylene diamine (6FDA-DAD) and 3,3',4,4' –
biphenyltetracarboxylic acid dianhydride – 1,1-bis(4-aminophenyl)-1-phenyl-2,2,2-trifluoroethane (BPDA-3F), have been
produced by surface modification with KOH aqueous solution followed by
K-assisted Ag doping and thermal reduction in hydrogen atmosphere. The
reaction rate of the nucleophilic hydrolysis in KOH, studied by Fourier
transform infrared spectroscopy (FT-IR) and Rutherford backscattering
spectrometry (RBS), depends on the polyimide chemical structure. After
ion-exchange in AgNO3 solution and subsequent annealing, the polyimide
structure recovery was monitored by FT-IR whereas the characteristic surface
plasmon absorption band of silver nanoparticles was evidenced by optical
absorption measurements. The structure of silver nanoclusters as related to
size and size distribution in the different polyimide matrices was
thoroughly investigated by Transmission electron microscopy (TEM) and X-ray
diffraction (XRD). The collected data evidenced a uniform distribution of Ag
clusters of nanometric size after thermal treatment at 300 ○C in both
polyimides. For the same ion-exchange treatment parameters and annealing
temperature, XRD analyses evidenced the presence of crystallites with
similar sizes. |
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