Photothermal effect of gold nanostar patterns inkjet-printed on coated paper substrates with different permeability.
Inkjet printing of spherical gold nanoparticles is widely applied in the fabrication of analytical and diagnostics tools. These methods could be extended to non-spherical gold nanoparticles that can efficiently release heat locally when irradiated in the near infrared (NIR) wavelength region, due to localized surface plasmon resonance (LSPR). However, this promising application requires the ability to maintain high efficiency and tunability of the NIR LSPR of the printed nanoparticles. In this study stable inks containing PEGylated gold nanostars (GNS) were fabricated and successfully inkjet-printed onto differently coated paper substrates with different porosity and permeability. A pronounced photothermal effect was observed under NIR excitation of LSPR of the printed GNS patterns even at low laser intensities. It was found that beside the direct role of the laser intensity, this effect depends appreciably on the printing parameters, such as drop density (δ, drops/mm2) and number of printed layers, and, critically, on the permeability of the coated paper substrates. These results will promote the development of GNS-based printed platforms for local photothermal therapy.
Department of Physics "G. Occhialini", Nanomedicine Center, University of Milano-Bicocca, piazza dell'Ateneo Nuovo, 20126, Milan, Italy.
Mykola
M
Borzenkov
Laboratory of Physical Chemistry, Center of Functional Materials, Åbo Academi University, Porthaninkatu 3-5, 20500, Turku, Finland.
Anni
A
Määttänen
Laboratory of Physical Chemistry, Center of Functional Materials, Åbo Academi University, Porthaninkatu 3-5, 20500, Turku, Finland.
Petri
P
Ihalainen
Department of Physics "G. Occhialini", Nanomedicine Center, University of Milano-Bicocca, piazza dell'Ateneo Nuovo, 20126, Milan, Italy.
Maddalena
M
Collini
Department of Chemistry, University of Pavia, viale Taramelli 12, 27100, Pavia, Italy.
Elisa
E
Cabrini
Department of Chemistry, University of Pavia, viale Taramelli 12, 27100, Pavia, Italy.
Giacomo
G
Dacarro
Department of Chemistry, University of Pavia, viale Taramelli 12, 27100, Pavia, Italy.
Piersandro
P
Pallavicini
Department of Physics "G. Occhialini", Nanomedicine Center, University of Milano-Bicocca, piazza dell'Ateneo Nuovo, 20126, Milan, Italy.
Giuseppe
G
Chirico
gold nanostars; inkjet printing; localized surface plasmon resonance (LSPR); photothermal effect