Volume 53, Issue 7 p. 618-626
RESEARCH ARTICLE

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

Mariapompesa Cutroneo

Corresponding Author

Mariapompesa Cutroneo

Department of Neutron Physics, Nuclear Physics Institute, AS CR, Rez, 25068 Czech Republic

Correspondence

Mariapompea Cutroneo, Department of Neutron Physics, Nuclear Physics Institute, AS CR, Rez 25068, Czech Republic.

Email: [email protected]

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Vladimír Havranek

Vladimír Havranek

Department of Neutron Physics, Nuclear Physics Institute, AS CR, Rez, 25068 Czech Republic

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Anna Mackova

Anna Mackova

Department of Neutron Physics, Nuclear Physics Institute, AS CR, Rez, 25068 Czech Republic

Department of Physics, Faculty of Science, University of J. E. Purkyně, České mládeže 8, Ústí nad Labem, 400 96 Czech Republic

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Petr Malinsky

Petr Malinsky

Department of Neutron Physics, Nuclear Physics Institute, AS CR, Rez, 25068 Czech Republic

Department of Physics, Faculty of Science, University of J. E. Purkyně, České mládeže 8, Ústí nad Labem, 400 96 Czech Republic

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Alfio Torrisi

Alfio Torrisi

Department of Neutron Physics, Nuclear Physics Institute, AS CR, Rez, 25068 Czech Republic

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Letteria Silipigni

Letteria Silipigni

Department of Mathematics and Computer Sciences, Physics Sciences and Earth Sciences (MIFT), Messina University, V. le F.S. d’ Alcontres 31, S. Agata, Messina, 98166 Italy

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Petr Slepicka

Petr Slepicka

Department of Solid State Engineering, Institute of Chemical Technology, Prague, 166 28 Czech Republic

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Dominik Fajstavr

Dominik Fajstavr

Department of Solid State Engineering, Institute of Chemical Technology, Prague, 166 28 Czech Republic

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Lorenzo Torrisi

Lorenzo Torrisi

Department of Mathematics and Computer Sciences, Physics Sciences and Earth Sciences (MIFT), Messina University, V. le F.S. d’ Alcontres 31, S. Agata, Messina, 98166 Italy

Department of Physics, INFN_Sezione Catania, Via S. Sofia 64, Catania, 95123 Italy

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First published: 12 April 2021
Citations: 3

Funding information: Grantová Agentura České Republiky, Grant/Award Number: 19-02482S

Abstract

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°C, the polymerisation of the polydimethylsiloxane matrix is completed in 15 min, whereas at room temperature (∼20°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°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.