The effect of electrolytic aggregation of Au nanoparticles on optical characteristics of AgInS2/ZnS QDs modified with oligonucleotides

• Published in: Applied nanoscience Vol. 13; no. 10; pp. 6819 - 6827
• Main Authors: Nesterenko, Y. O., Rachkov, O. E., Kozoriz, K. O., Dzyadevych, S. V., Borkovska, L. V.
• Format: Journal Article
• Language: English
• Published: Cham Springer International Publishing 01.10.2023; Springer Nature B.V
• Subjects: Absorption; Buffer solutions; Chemistry and Materials Science; Dilution; Glutathione; Gold; Lipoic acid; Materials Science; Membrane Biology; Nanochemistry; Nanoparticles; Nanotechnology; Nanotechnology and Microengineering; Oligonucleotides; Optical properties; Original Article; Photoluminescence; Quantum dots; Room temperature; Spectra; Surface chemistry; Zinc sulfide; Electrolytic aggregation; Au nanoparticles; Quantum dot; AgInS; ZnS; Photoluminescence
• ISSN: 2190-5509; 2190-5517
• DOI: 10.1007/s13204-023-02779-5

The effect of Au nanoparticles (AuNPs) on the photoluminescence (PL) of AgInS 2 /ZnS quantum dots (QDs) in buffer solutions was investigated. The QDs stabilized with mercaptoacetic acid and glutathione were modified by 19-bases thiolated oligonucleotides, and the AuNPs grown in citrate solution and stabilized with lipoic acid and mercaptohexanol were modified by 26-bases thiolated oligonucleotide. These oligonucleotides are not complementary to each other. The nanoobjects were placed in buffer solutions of SSC with different dilutions (0.1 × , 0.25 × , 0.5 × SSC). The PL and optical absorption (OA) spectra of prepared solutions were studied. In the buffer solutions of different dilutions, the formation of aggregates of AuNPs depends on QDs’ stabilizing ligands and presence/absence of oligonucleotides on AuNPs’ surface, which was detected by specific changes in the OA spectra. The degree of PL quenching also was different in solution with modified and unmodified nanoobjects. The solutions were additionally incubated at room temperature for 24 h to see the dynamic of changing in the interaction between AuNPs and QDs, one of the manifestations of this interaction was an electrolytic aggregation. It is proposed that the observed decrease of PL intensity (PLI) in solutions with unmodified nanoobjects is due to the partial absorption of excitation light by AuNPs, and the interaction between QDs and AuNPs is caused by the presence of noncomplementary oligonucleotides on their surface.