Gold nanoparticles linked by conductive molecules. Preparation and characterization of dimers.
Anna V. Lukyanenko1,2, Andrey V. Tsarenko1,2, Amina Sh. Umarova3, Alexander S. Alexandrovsky1, Alexander. S. Fedorov1,2
1Kirensky Institute of Physics,Federal Research Center KSC SB RAS, Krasnoyarsk, Russia; 2Siberian Federal University, Krasnoyarsk, Russia; 3Reshetnev Siberian State University of Science and Technology, Krasnoyarsk, Russia
Abstract
A procedure for the preparation of Au NPs using wet chemical synthesis methods is described. Formation of complexes from nanoparticles is possible due to bonding with various organic molecules, leading to the formation of "hot spots". These forms to significantly enhance the intensity of surface-enhanced Raman scattering (SERS) signals due to the presence regions of high electromagnetic enhancement at the junctions between metal nanoparticles. The monomeric Au NPs were functionalized with 1,2-bis(2-pyridyl)ethylene (BPE) to obtain Au-BPE dimers. The absorption spectra of AuNP dimers connected by linkers in aqueous solution show the presence of a virtually unchanged LSP of monomeric AuNPs and the appearance of a very intense additional resonance. In addition to the localized plasmon resonance of individual NPs at 530 nm, the optical spectra exhibit a new intense absorption peak in the near-infrared region at ∼780 nm. The emerging absorption peak is attributed to the charge-transfer plasmon (CTP) mode. This modification of the absorption spectrum is favorable for hyperthermia applications when illuminating organic tissues in the range of 700–900 nm. This resonance absorption may be of interest for biomedical applications due to its position in the so-called transmission window of biological tissues. The effect of the pH environment on the stability of Au-BPE dimers was studied.
Speaker
Anna Lukyanenko
Kirensky Institute of Physics, Federal Research Center KSC SB RAS
Russia
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