Luminescence of hybrid nanostructures based on colloidal Ag 2 S/TGA quantum dots and Indocyanine Green molecules
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RESEARCH PAPER
Luminescence of hybrid nanostructures based on colloidal Ag2 S/TGA quantum dots and Indocyanine Green molecules Tamara S. Kondratenko · Mikhail S. Smirnov · Oleg V. Ovchinnikov · Irina G. Grevtseva
Received: 3 October 2019 / Accepted: 7 August 2020 © Springer Nature B.V. 2020
Abstract This work presents studies of IR luminescence sensitization of Indocyanine Green dye (ICG), observed during association with colloidal Ag2 S quantum dots with an average size of 2.2 nm passivated with thioglycolic acid (Ag2 S/TGA QD). The opportunity of enhancing the dye monomer luminescence (peak at 820 nm) by 4–6 times under excitation of 660 nm in the presence of Ag2 S/TGA QDs (2.2 nm) was shown. At the same time, Ag2 S/TGA QDs luminescence intensity does not change. quantum yield (QY) luminescence of ICG increases by 5 times. The luminescence lifetime obtained with use of luminescence decay analysis at wavelength of 820 nm increases by 2.2 times. The observed changes in ICG luminescent properties during its conjugation with Ag2 S/TGA QDs are result of a decrease in the mobility of the dye polymethine chain due to coordination interaction with Ag2 S/TGA QDs, which decreases the efficiency of non-radiative transitions. Keywords Luminescence properties · Silver sulfide quantum dots · Indocyanine Green · Hybrid associate
T. S. Kondratenko () · M. S. Smirnov · O. V. Ovchinnikov · I. G. Grevtseva Voronezh State University, Voronezh 394018, Russia e-mail: [email protected] M. S. Smirnov Voronezh State University of Engineering Technologies, Voronezh 394036, Russia
Introduction Currently, great interest is shown in devices and materials of nanophotonics in the field of medical applications (Conde et al. 2012; Matea et al. 2017; Zhao et al. 2018). The Indocyanine Green (ICG) tricarbocyanine dye is significant interest. ICG is the fluorescent material approved for clinical diagnosis (Ogawa et al. 2009; Xue et al. 2018; Altinoglu et al. 2008; Lee et al. 2009; Patel et al. 2012; Sheng et al. 2016; Ito et al. 2008; Quan et al. 2012). The absorption (780–800 nm) and luminescence (820–840 nm) of its monomer are in the near-IR region, corresponded to the first therapeutic window (NIR-I) (Reindl et al. 1997; Philip et al. 1996; Rotermund et al. 1997; Gerega et al. 2011; Hong et al. 2016; Jin et al. 2016; Lee et al. 2015; Kirchherr et al. 2009; Jung et al. 2014; Mauerer et al. 1998; Holzer et al. 1998). The monomer is unstable in an aqueous solution. The degradation period is from 20 min to 24 h, depending on the conditions (Hong et al. 2016; Jin et al. 2016; Lee et al. 2015; Kirchherr et al. 2009; Fuyuki et al. 2013; Mindt et al. 2018). The leuko form (Fuyuki et al. 2013; Philip et al. 1996), Jaggregates (Mauerer et al. 1998; Holzer et al. 1998; Fuyuki et al. 2013; Mindt et al. 2018; Rotermund et al. 1997; Zweck and Penzkofer 2001; Liu et al. 2017) and new form ICG-680 (Holzer et al. 1998) are the main degradation products limiting the use of this dye. Encapsulation using the calcium phosphate derivatives (Altinoglu
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