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The characterisation of polydimethylsiloxane containing gold nanoparticles as a function of curing time

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    0542125 - ÚJF 2022 RIV GB eng J - Journal Article
    Cutroneo, Mariapompea - Havránek, Vladimír - Macková, Anna - Malinský, Petr - Torrisi, Alfio - Silipigni, L. - Slepička, P. - Fajstavr, D. - Torrisi, L.
    The characterisation of polydimethylsiloxane containing gold nanoparticles as a function of curing time.
    Surface and Interface Analysis. Roč. 53, č. 7 (2021), s. 618-626. ISSN 0142-2421. E-ISSN 1096-9918
    R&D Projects: GA ČR GA19-02482S
    Institutional support: RVO:61389005
    Keywords : absorbance * atomic-force microscopy * curing time * nanoparticles * porous polydimethylsiloxane * scanning electron microscopy
    Subject RIV: BG - Nuclear, Atomic and Molecular Physics, Colliders
    OECD category: Atomic, molecular and chemical physics (physics of atoms and molecules including collision, interaction with radiation, magnetic resonances, Mössbauer effect)
    Impact factor: 1.607, year: 2020
    Method of publishing: Limited access
    https://doi.org/10.1002/sia.6948

    Spherical gold nanoparticles (NPs), 10 nm in diameter, have been dispersed in a type of polydimethylsiloxane, whose polymerisation requires accurate temperature control. At the temperature of 100 degrees C, the polymerisation of the polydimethylsiloxane matrix is completed in 15 min, whereas at room temperature (similar to 20 degrees C), it takes about 24-48 h. Gold NPs were incorporated into polydimethylsiloxane after which the resulting nanocomposites were placed in an oven preheated to 100 degrees C for different curing times. Both porous and bulk nanocomposites were obtained using a bottom-up approach. Polydimethylsiloxane (PDMS) nanocomposites with the weight-percentage concentration of 0.2% of Au NPs were cured for 15, 30 and 45 min. Different curing times have affected the Au-NP properties. The network of porous PDMS nanocomposite promotes a uniform anchoring of the gold NPs. The porous PDMS nanocomposite samples, prepared using the sugar-template method, have been compared with the bulk counterpart to obtain a full characterisation of the material. The dependence of the morphological and electrical properties of gold NPs on their size has been studied by atomic-force microscopy and two-point-probe electrical-conductivity measurement. The optical performance of the bulk PDMS nanocomposites has been analysed by ultraviolet-visible (UV-vis) spectroscopy in the transmission mode. An enhancement of the absorption was observed after the increase of both the nanocomposite-curing time and the percentage of the Au NPs used as fillers. The fabricated nanocomposite can be used to manufacture optical-sensing devices, switches in optoelectronics and optical waveguides.
    Permanent Link: http://hdl.handle.net/11104/0320319

     
     
Number of the records: 1