Surface plasmon resonance enhancement of photoluminescence intensity and bioimaging application of gold nanorod@CdSe/ZnS quantum dots

Abstract

Biological applications of core/shell near-infrared quantum dots (QDs) have attracted broad interest due to their unique optical and chemical properties. Additionally, the use of multifunctional nanomaterials with near-infrared QDs and plasmonic functional nanoparticles are promising for applications in electronics, bioimaging, energy, and environmental-related studies. In this work, we experimentally demonstrate how to construct a multifunctional nanoparticle comprised of CdSe/ZnS QDs and gold nanorods (GNRs) where the GNRs were applied to enhance the photoluminescence (PL) of the CdSe/ZnS QDs. In particular, we have obtained the scattering PL spectrum of a single CdSe/ZnS QD and GNR@CdSe/ZnS nanoparticle and comparison results show that the CdSe/ZnS QDs have an apparent PL enhancement of four-times after binding with GNRs. In addition, in vitro experimental results show that the biostability of the GNR@CdSe/ZnS nanoparticles can be improved by using folic acid. A bioimaging study has also been performed where GNR@CdSe/ZnS nanoparticles were used as an optical process for MCF-7 breast cancer cells.

Metallic Nanoparticles for the Modulation of Tumor Microenvironment; A New Horizon

“…Due to the NPs’s size and high surface-to-volume ratio, it is possible to load the drug in different parts of NPs, including the surface of the NPs, inside the capsule-like structures and connecting to internal components such as those seen in dendrimers. Therefore, they can provide effective TME modulation ( Dadwal et al, 2018 ; Hu et al, 2019 ). One of the critical drug accumulators in cancer is the enhanced permeability and retention (EPR) effect.…”

The structural and luminescence properties of plexcitonic structures based on Ag2S/l-Cys quantum dots and Au nanorods

“…[9][10][11]28 The size dispersion of QDs strongly affects the spectral resonance due to the large luminescence bandwidth. [9][10][11]28 In most situations described in the literature, QDs with exciton luminescence are considered. [10][11][12][13][14][15][17][18][19][21][22][23][24][25] Under conditions of signicant overlap of QD luminescence and extinction bands of plasmonic nanoparticles (NPs), processes of electronic excitation exchange, in particular, nonradiative energy transfer from QDs to plasmonic NPs, play a signicant role in the plasmon-exciton interaction; [29][30][31] charge phototransfer is also an important effect in these systems.…”

Photoluminescent Ozone Sensor with Enhanced Sensitivity by Using CdSe/ZnS Quantum Dots Modified with Gold and Platinum

“…Among them, the Pt-QD film showed the highest PL intensity, possibly reflecting electronic interactions between Pt and QDs, such as a plasmonic effect, increased electric field near NMs, or the passivation of defects on the surface of the QDs by Pt, as previously reported on various NM-QD systems. [15][16][17][18][19] By contrast, the PL intensity of the Ag-QD film was lower by about one order of magnitude, probably reflecting activation of defects on the surface of the QD by Ag or energy transfer, 20 PL intensity was different among these films.…”