WSEAS Transactions on Biology and Biomedicine
Print ISSN: 1109-9518, E-ISSN: 2224-2902
Volume 16, 2019
Synthesis of Gold Nanoshells with Plasmon Resonance Tuned to the Infrared Region of the Electromagnetic Spectrum
Authors: , , , , , , ,
Abstract: Gold nanoshells (GNS) present a silica core surrounded by a gold shell, present a shift on their surface plasmon resonance (SPR) to the near-infrared (NIR) part of the electromagnetic spectrum, when synthesized with specific dimensions. This paper presents a simple method to prepare the nanoshells, a step by step characterization, as well as their absorbance spectrum. For the synthesis, silica spheres, with approximately 130 ± 5 nm in diameter, were prepared using the Stöber method and then functionalized with 3-aminopropyltriethoxysilane (APTES). The gold nanoparticles (GNPs), with a diameter of 7 ± 3 nm, were produced by the reduction of chloroauric acid. Then, the silica was seeded with the GNPs to later grow a gold shell with the help of Au(OH)4¯ ions and formaldehyde. UV-Vis spectroscopy results showed a progressive shift on the absorbance peak to the NIR throughout the synthesis. Transmission electron microscope (TEM) and scanning electron microscope (SEM) images suggest that the absorption peak movement coincided with the completion of the shell. Furthermore, when the sample was irradiated with an 820nm wavelength/3.1 mW laser, its temperatures increased 6.3 °C in 2 minutes, showing its absorbance in the NIR.
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Keywords: Gold nanoshells, surface plasmon resonance, near infrared, gold nanoparticles, absorption, silica
Pages: 29-36
WSEAS Transactions on Biology and Biomedicine, ISSN / E-ISSN: 1109-9518 / 2224-2902, Volume 16, 2019, Art. #4