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Loukopoulos S, Sakellis E, Kostakis MG, Gerokonstantis DT, Tsipas P, Gardelis S, Kontos AG, Katsaros FK, Sideratou Z, Romanos GE, Dimoulas A, Thomaidis NS, Likodimos V. Co-assembled MoS 2-TiO 2 Inverse Opal Photocatalysts for Visible Light-Activated Pharmaceutical Photodegradation. ACS Omega 2023; 8:33639-33650. [PMID: 37744818 PMCID: PMC10515384 DOI: 10.1021/acsomega.3c03881] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/02/2023] [Accepted: 08/18/2023] [Indexed: 09/26/2023]
Abstract
Heterostructured photocatalytic materials in the form of photonic crystals have been attracting attention for their unique light harvesting ability that can be ideally combined with judicious compositional modifications toward the development of visible light-activated (VLA) photonic catalysts, though practical environmental applications, such as the degradation of pharmaceutical emerging contaminants, have been rarely reported. Herein, heterostructured MoS2-TiO2 inverse opal films are introduced as highly active immobilized photocatalysts for the VLA degradation of tetracycline and ciprofloxacin broad-spectrum antibiotics as well as salicylic acid. A single-step co-assembly method was implemented for the challenging incorporation of MoS2 nanosheets into the nanocrystalline inverse opal walls. Compositional tuning and photonic band gap engineering of the MoS2-TiO2 photonic films showed that integration of low amounts of MoS2 nanosheets in the inverse opal framework maintains intact the periodic macropore structure and enhances the available surface area, resulting in efficient VLA antibiotic degradation far beyond the performance of benchmark TiO2 films. The combination of broadband MoS2 visible light absorption and photonic-assisted light trapping together with the enhanced charge separation that enables the generation of reactive oxygen species via firm interfacial coupling between MoS2 nanosheets and TiO2 nanoparticles is concluded as a competent approach for pharmaceutical abatement in water bodies.
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Affiliation(s)
- Stelios Loukopoulos
- Section
of Condensed Matter Physics, Department of Physics, National and Kapodistrian University of Athens, University Campus, Zografou, Athens 15784, Greece
| | - Elias Sakellis
- Institute
of Nanoscience and Nanotechnology, National
Center for Scientific Research “Demokritos”, Agia Paraskevi, Athens 15341, Greece
| | - Marios G. Kostakis
- Laboratory
of Analytical Chemistry, Department of Chemistry, National and Kapodistrian University of Athens, University Campus, Zografou, Athens 15771, Greece
| | - Dimitrios-Triantafyllos Gerokonstantis
- Laboratory
of Analytical Chemistry, Department of Chemistry, National and Kapodistrian University of Athens, University Campus, Zografou, Athens 15771, Greece
| | - Polychronis Tsipas
- Institute
of Nanoscience and Nanotechnology, National
Center for Scientific Research “Demokritos”, Agia Paraskevi, Athens 15341, Greece
| | - Spiros Gardelis
- Section
of Condensed Matter Physics, Department of Physics, National and Kapodistrian University of Athens, University Campus, Zografou, Athens 15784, Greece
| | - Athanassios G. Kontos
- Institute
of Nanoscience and Nanotechnology, National
Center for Scientific Research “Demokritos”, Agia Paraskevi, Athens 15341, Greece
- Department
of Physics, School of Applied Mathematical and Physical Sciences, National Technical University of Athens, Athens 15780, Greece
| | - Fotis K. Katsaros
- Institute
of Nanoscience and Nanotechnology, National
Center for Scientific Research “Demokritos”, Agia Paraskevi, Athens 15341, Greece
| | - Zili Sideratou
- Institute
of Nanoscience and Nanotechnology, National
Center for Scientific Research “Demokritos”, Agia Paraskevi, Athens 15341, Greece
| | - George Em. Romanos
- Institute
of Nanoscience and Nanotechnology, National
Center for Scientific Research “Demokritos”, Agia Paraskevi, Athens 15341, Greece
| | - Athanasios Dimoulas
- Institute
of Nanoscience and Nanotechnology, National
Center for Scientific Research “Demokritos”, Agia Paraskevi, Athens 15341, Greece
| | - Nikolaos S. Thomaidis
- Laboratory
of Analytical Chemistry, Department of Chemistry, National and Kapodistrian University of Athens, University Campus, Zografou, Athens 15771, Greece
| | - Vlassis Likodimos
- Section
of Condensed Matter Physics, Department of Physics, National and Kapodistrian University of Athens, University Campus, Zografou, Athens 15784, Greece
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2
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Giannakopoulou T, Todorova N, Plakantonaki N, Vagenas M, Sakellis E, Papargyriou D, Katsiotis M, Trapalis C. CO 2-Derived Nanocarbons with Controlled Morphology and High Specific Capacitance. ACS Omega 2023; 8:29500-29511. [PMID: 37599958 PMCID: PMC10433508 DOI: 10.1021/acsomega.3c03207] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/09/2023] [Accepted: 07/07/2023] [Indexed: 08/22/2023]
Abstract
The conversion of CO2 to nanocarbons addresses a dual goal of harmful CO2 elimination from the atmosphere along with the production of valuable nanocarbon materials. In the present study, a simple one-step metallothermic CO2 reduction to nanocarbons was performed at 675 °C with the usage of a Mg reductant. The latter was employed alone and in its mixture with ferrocene, which was found to control the morphology of the produced nanocarbons. Scanning electron microscopy (SEM) analysis reveals a gradual increase in the amount of nanoparticles with different shapes and a decrease in tubular nanostructures with the increase of ferrocene content in the mixture. A possible mechanism for such morphological alterations is discussed. Transmission electron microscopy (TEM) analysis elucidates that the nanotubes and nanoparticles gain mainly amorphous structures, while sheet- and cloud-like morphologies also present in the materials possess significantly improved crystallinity. As a result, the overall crystallinity was preserved constant for all of the samples, which was confirmed by X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) techniques. Finally, electrochemical tests demonstrated that the prepared nanocarbons retained high specific capacitance values in the range of 200-310 F/g (at 0.1 V/s), which can be explained by the measured high specific surface area (650-810 m2/g), total pore volume (1.20-1.55 cm3/g), and the degree of crystallinity. The obtained results demonstrate the suitability of ferrocene for managing the nanocarbons' morphology and open perspectives for the preparation of efficient "green" nanocarbon materials for energy storage applications and beyond.
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Affiliation(s)
- Tatiana Giannakopoulou
- Institute
of Nanoscience and Nanotechnology, National
Center for Scientific Research “Demokritos”, 15341 Agia Paraskevi, Greece
| | - Nadia Todorova
- Institute
of Nanoscience and Nanotechnology, National
Center for Scientific Research “Demokritos”, 15341 Agia Paraskevi, Greece
| | - Niki Plakantonaki
- Institute
of Nanoscience and Nanotechnology, National
Center for Scientific Research “Demokritos”, 15341 Agia Paraskevi, Greece
| | - Michail Vagenas
- Institute
of Nanoscience and Nanotechnology, National
Center for Scientific Research “Demokritos”, 15341 Agia Paraskevi, Greece
| | - Elias Sakellis
- Institute
of Nanoscience and Nanotechnology, National
Center for Scientific Research “Demokritos”, 15341 Agia Paraskevi, Greece
| | | | - Marios Katsiotis
- Group
Innovation & Technology, TITAN Cement
S.A., 11143 Athens, Greece
| | - Christos Trapalis
- Institute
of Nanoscience and Nanotechnology, National
Center for Scientific Research “Demokritos”, 15341 Agia Paraskevi, Greece
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Mavroidi B, Kaminari A, Sakellis E, Sideratou Z, Tsiourvas D. Carbon Dots-Biomembrane Interactions and Their Implications for Cellular Drug Delivery. Pharmaceuticals (Basel) 2023; 16:833. [PMID: 37375780 DOI: 10.3390/ph16060833] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2023] [Revised: 05/29/2023] [Accepted: 05/30/2023] [Indexed: 06/29/2023] Open
Abstract
The effect of carbon dots (CDs) on a model blayer membrane was studied as a means of comprehending their ability to affect cell membranes. Initially, the interaction of N-doped carbon dots with a biophysical liposomal cell membrane model was investigated by dynamic light scattering, z-potential, temperature-modulated differential scanning calorimetry, and membrane permeability. CDs with a slightly positive charge interacted with the surface of the negative-charged liposomes and evidence indicated that the association of CDs with the membrane affects the structural and thermodynamic properties of the bilayer; most importantly, it enhances the bilayer's permeability against doxorubicin, a well-known anticancer drug. The results, like those of similar studies that surveyed the interaction of proteins with lipid membranes, suggest that carbon dots are partially embedded in the bilayer. In vitro experiments employing breast cancer cell lines and human healthy dermal cells corroborated the findings, as it was shown that the presence of CDs in the culture medium selectively enhanced cell internalization of doxorubicin and, subsequently, increased its cytotoxicity, acting as a drug sensitizer.
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Affiliation(s)
- Barbara Mavroidi
- Institute of Biosciences and Applications, National Centre for Scientific Research "Demokritos", 15310 Aghia Paraskevi, Greece
| | - Archontia Kaminari
- Institute of Nanoscience and Nanotechnology, National Centre for Scientific Research "Demokritos", 15310 Aghia Paraskevi, Greece
| | - Elias Sakellis
- Institute of Nanoscience and Nanotechnology, National Centre for Scientific Research "Demokritos", 15310 Aghia Paraskevi, Greece
| | - Zili Sideratou
- Institute of Nanoscience and Nanotechnology, National Centre for Scientific Research "Demokritos", 15310 Aghia Paraskevi, Greece
| | - Dimitris Tsiourvas
- Institute of Nanoscience and Nanotechnology, National Centre for Scientific Research "Demokritos", 15310 Aghia Paraskevi, Greece
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Papadopoulou-Fermeli N, Lagopati N, Pippa N, Sakellis E, Boukos N, Gorgoulis VG, Gazouli M, Pavlatou EA. Composite Nanoarchitectonics of Photoactivated Titania-Based Materials with Anticancer Properties. Pharmaceutics 2022; 15:pharmaceutics15010135. [PMID: 36678763 PMCID: PMC9864881 DOI: 10.3390/pharmaceutics15010135] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2022] [Revised: 12/23/2022] [Accepted: 12/26/2022] [Indexed: 01/04/2023] Open
Abstract
The synthesis of titania-based composite materials with anticancer potential under visible-light irradiation is the aim of this study. In specific, titanium dioxide (TiO2) nanoparticles (NPs) chemically modified with silver were embedded in a stimuli-responsive microgel (a crosslinked interpenetrating network (IP) network that was synthesized by poly (N-Isopropylacrylamide) and linear chains of polyacrylic acid sodium salt, forming composite particles. The ultimate goal of this research, and for our future plans, is to develop a drug-delivery system that uses optical fibers that could efficiently photoactivate NPs, targeting cancer cells. The produced Ag-TiO2 NPs, the microgel and the composite materials were characterized through X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), micro-Raman spectroscopy, ultraviolet-visible spectroscopy (UV-Vis), dynamic light scattering (DLS) and transmission electron microscopy (TEM). Our results indicated that Ag-TiO2 NPs were successfully embedded within the thermoresponsive microgel. Either Ag-TiO2 NPs or the composite materials exhibited high photocatalytic degradation efficiency on the pollutant rhodamine B and significant anticancer potential under visible-light irradiation.
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Affiliation(s)
- Nefeli Papadopoulou-Fermeli
- Laboratory of General Chemistry, School of Chemical Engineering, National Technical University of Athens, Zografou Campus, 15789 Zografou, Greece
| | - Nefeli Lagopati
- Laboratory of General Chemistry, School of Chemical Engineering, National Technical University of Athens, Zografou Campus, 15789 Zografou, Greece
- Laboratory of Biology, Department of Basic Medical Sciences, Medical School, National and Kapodistrian University of Athens, 11527 Athens, Greece
- Laboratory of Histology-Embryology, Molecular Carcinogenesis Group, Department of Basic Medical Sciences, Medical School, National and Kapodistrian University of Athens, 11527 Athens, Greece
| | - Natassa Pippa
- Section of Pharmaceutical Technology, Department of Pharmacy, School of Health Sciences, National and Kapodistrian University of Athens, 15771 Athens, Greece
| | - Elias Sakellis
- Institute of Nanoscience and Nanotechnology, National Center for Scientific Research “Demokritos”, 15310 Agia Paraskevi, Greece
| | - Nikos Boukos
- Institute of Nanoscience and Nanotechnology, National Center for Scientific Research “Demokritos”, 15310 Agia Paraskevi, Greece
| | - Vassilis G. Gorgoulis
- Laboratory of Histology-Embryology, Molecular Carcinogenesis Group, Department of Basic Medical Sciences, Medical School, National and Kapodistrian University of Athens, 11527 Athens, Greece
- Biomedical Research Foundation, Academy of Athens, 11527 Athens, Greece
- Clinical Molecular Pathology, Medical School, University of Dundee, Dundee DD1 9SY, UK
- Molecular and Clinical Cancer Sciences, Manchester Cancer Research Centre, Manchester Academic Health Sciences Centre, University of Manchester, Manchester M20 4GJ, UK
- Center for New Biotechnologies and Precision Medicine, Medical School, National and Kapodistrian University of Athens, 11527 Athens, Greece
- Faculty of Health and Medical Sciences, University of Surrey, Guildford GU2 7YH, UK
| | - Maria Gazouli
- Laboratory of Biology, Department of Basic Medical Sciences, Medical School, National and Kapodistrian University of Athens, 11527 Athens, Greece
- School of Science and Technology, Hellenic Open University, 26335 Patra, Greece
| | - Evangelia A. Pavlatou
- Laboratory of General Chemistry, School of Chemical Engineering, National Technical University of Athens, Zografou Campus, 15789 Zografou, Greece
- Correspondence: ; Tel.: +30-210-772-3110
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Stavropoulou AP, Theodosiou M, Sakellis E, Boukos N, Papanastasiou G, Wang C, Tavares A, Corral CA, Gournis D, Chalmpes N, Gobbo OL, Efthimiadou EK. Bimetallic gold-platinum nanoparticles as a drug delivery system coated with a new drug to target glioblastoma. Colloids Surf B Biointerfaces 2022; 214:112463. [PMID: 35316703 DOI: 10.1016/j.colsurfb.2022.112463] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2021] [Revised: 03/09/2022] [Accepted: 03/14/2022] [Indexed: 01/04/2023]
Abstract
A drug delivery nanosystem of noble bimetallic nanoparticles (NPs) which consists of Au NPs capped with Pt NPs (Au@Pt NPs) is constructed and functionalised with a quinazoline based small molecule (Au@Pt@Q NPs), acting as a theranostic agent against glioblastoma. Two different hydrothermal synthetic procedures for bimetallic Au@Pt NPs are presented and the resulting nanostructures are fully characterised by means of spectroscopic and microscopic methods. The imaging and targeting capacity of the new drug delivery system is assessed through fluorescent optical microscopy and cytotoxicity evaluations. The constructed Au@Pt NPs consist a monodispersed colloidal solution of 25 nm with photoluminescent, fluorescent and X-Ray absorption properties that confirm their diagnostic potential. Haemolysis testing demonstrated that Au@Pt NPs are biocompatible and fluorescent microscopy confirmed their entering the cells. Cytological evaluation of the NPs through MTT assay showed that they do not inhibit the proliferation of control cell line HEK293, whereas they are toxic in U87MG, U251 and D54 glioblastoma cell lines; rendering them selective targeting agents for treating glioblastoma.
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Affiliation(s)
- Anastasia P Stavropoulou
- Inorganic Chemistry Laboratory, Chemistry Department, National and Kapodistrian University of Athens, Panepistimioupolis, Zografou, Athens, Greece; Institute of Nanoscience and Nanotechnology, NCSR "Demokritos", Agia Paraskevi, Athens, Greece
| | - Maria Theodosiou
- Inorganic Chemistry Laboratory, Chemistry Department, National and Kapodistrian University of Athens, Panepistimioupolis, Zografou, Athens, Greece; Institute of Nanoscience and Nanotechnology, NCSR "Demokritos", Agia Paraskevi, Athens, Greece
| | - Elias Sakellis
- Institute of Nanoscience and Nanotechnology, NCSR "Demokritos", Agia Paraskevi, Athens, Greece
| | - Nikos Boukos
- Institute of Nanoscience and Nanotechnology, NCSR "Demokritos", Agia Paraskevi, Athens, Greece
| | - Giorgos Papanastasiou
- School of Computer Science and Electronic Engineering, University of Essex, Colchester Campus, CO4 3SQ, UK; Edinburgh Imaging Queen's Medical Research Institute, University of Edinburgh, Edinburgh EH16 4TJ, UK
| | - Chengjia Wang
- Edinburgh Imaging Queen's Medical Research Institute, University of Edinburgh, Edinburgh EH16 4TJ, UK
| | - Adriana Tavares
- Edinburgh Imaging Queen's Medical Research Institute, University of Edinburgh, Edinburgh EH16 4TJ, UK
| | - Carlos Alcaide Corral
- Edinburgh Imaging Queen's Medical Research Institute, University of Edinburgh, Edinburgh EH16 4TJ, UK
| | - Dimitrios Gournis
- Department of Materials Science & Engineering, University of Ioannina, 45110 Ioannina, Greece
| | - Nikolaos Chalmpes
- Department of Materials Science & Engineering, University of Ioannina, 45110 Ioannina, Greece
| | - Oliviero L Gobbo
- Trinity College Dublin, School of Pharmacy & Pharmaceutical Sciences, Dublin, Ireland
| | - Eleni K Efthimiadou
- Inorganic Chemistry Laboratory, Chemistry Department, National and Kapodistrian University of Athens, Panepistimioupolis, Zografou, Athens, Greece; Institute of Nanoscience and Nanotechnology, NCSR "Demokritos", Agia Paraskevi, Athens, Greece.
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6
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Theodosiou M, Sakellis E, Boukos N, Kusigerski V, Kalska-Szostko B, Efthimiadou E. Iron oxide nanoflowers encapsulated in thermosensitive fluorescent liposomes for hyperthermia treatment of lung adenocarcinoma. Sci Rep 2022; 12:8697. [PMID: 35610309 PMCID: PMC9130318 DOI: 10.1038/s41598-022-12687-3] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2021] [Accepted: 05/05/2022] [Indexed: 02/08/2023] Open
Abstract
Magnetic hyperthermia (MHT) is in the spotlight of nanomedical research for the treatment of cancer employing magnetic iron oxide nanoparticles and their intrinsic capability for heat dissipation under an alternating magnetic field (AMF). Herein we focus on the synthesis of iron oxide nanoflowers (Nfs) of different sizes (15 and 35 nm) and coatings (bare, citrate, and Rhodamine B) while comparing their physicochemical and magnetothermal properties. We encapsulated colloidally stable citrate coated Nfs, of both sizes, in thermosensitive liposomes via extrusion, and RhB was loaded in the lipid bilayer. All formulations proved hemocompatible and cytocompatible. We found that 35 nm Nfs, at lower concentrations than 15 nm Nfs, served better as nanoheaters for magnetic hyperthermia applications. In vitro, magnetic hyperthermia results showed promising therapeutic and imaging potential for RhB loaded magnetoliposomes containing 35 nm Nfs against LLC and CULA cell lines of lung adenocarcinoma.
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Affiliation(s)
- Maria Theodosiou
- Laboratory of Inorganic Chemistry, Department of Chemistry, National and Kapodistrian University of Athens, Athens, Greece.,Institute of Nanoscience and Nanotechnology, National Center for Scientific Research "Demokritos", Athens, Greece
| | - Elias Sakellis
- Institute of Nanoscience and Nanotechnology, National Center for Scientific Research "Demokritos", Athens, Greece
| | - Nikos Boukos
- Institute of Nanoscience and Nanotechnology, National Center for Scientific Research "Demokritos", Athens, Greece
| | - Vladan Kusigerski
- Institute of Nuclear Sciences Vinca, University of Belgrade, Belgrade, Republic of Serbia
| | | | - Eleni Efthimiadou
- Laboratory of Inorganic Chemistry, Department of Chemistry, National and Kapodistrian University of Athens, Athens, Greece. .,Institute of Nanoscience and Nanotechnology, National Center for Scientific Research "Demokritos", Athens, Greece.
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Pylarinou M, Toumazatou A, Sakellis E, Xenogiannopoulou E, Gardelis S, Boukos N, Dimoulas A, Likodimos V. Visible Light Trapping against Charge Recombination in FeO x-TiO 2 Photonic Crystal Photocatalysts. Materials (Basel) 2021; 14:7117. [PMID: 34885271 PMCID: PMC8658129 DOI: 10.3390/ma14237117] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/22/2021] [Revised: 11/17/2021] [Accepted: 11/19/2021] [Indexed: 11/17/2022]
Abstract
Tailoring metal oxide photocatalysts in the form of heterostructured photonic crystals has spurred particular interest as an advanced route to simultaneously improve harnessing of solar light and charge separation relying on the combined effect of light trapping by macroporous periodic structures and compositional materials' modifications. In this work, surface deposition of FeOx nanoclusters on TiO2 photonic crystals is investigated to explore the interplay of slow-photon amplification, visible light absorption, and charge separation in FeOx-TiO2 photocatalytic films. Photonic bandgap engineered TiO2 inverse opals deposited by the convective evaporation-induced co-assembly method were surface modified by successive chemisorption-calcination cycles using Fe(III) acetylacetonate, which allowed the controlled variation of FeOx loading on the photonic films. Low amounts of FeOx nanoclusters on the TiO2 inverse opals resulted in diameter-selective improvements of photocatalytic performance on salicylic acid degradation and photocurrent density under visible light, surpassing similarly modified P25 films. The observed enhancement was related to the combination of optimal light trapping and charge separation induced by the FeOx-TiO2 interfacial coupling. However, an increase of the FeOx loading resulted in severe performance deterioration, particularly prominent under UV-Vis light, attributed to persistent surface recombination via diverse defect d-states.
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Affiliation(s)
- Martha Pylarinou
- Section of Condensed Matter Physics, Department of Physics, University Campus, National and Kapodistrian University of Athens, 15784 Athens, Greece; (M.P.); (A.T.); (S.G.)
| | - Alexia Toumazatou
- Section of Condensed Matter Physics, Department of Physics, University Campus, National and Kapodistrian University of Athens, 15784 Athens, Greece; (M.P.); (A.T.); (S.G.)
| | - Elias Sakellis
- Institute of Nanoscience and Nanotechnology, National Center for Scientific Research “Demokritos”, 15341 Agia Paraskevi, Greece; (E.S.); (E.X.); (N.B.); (A.D.)
| | - Evangelia Xenogiannopoulou
- Institute of Nanoscience and Nanotechnology, National Center for Scientific Research “Demokritos”, 15341 Agia Paraskevi, Greece; (E.S.); (E.X.); (N.B.); (A.D.)
| | - Spiros Gardelis
- Section of Condensed Matter Physics, Department of Physics, University Campus, National and Kapodistrian University of Athens, 15784 Athens, Greece; (M.P.); (A.T.); (S.G.)
| | - Nikos Boukos
- Institute of Nanoscience and Nanotechnology, National Center for Scientific Research “Demokritos”, 15341 Agia Paraskevi, Greece; (E.S.); (E.X.); (N.B.); (A.D.)
| | - Athanasios Dimoulas
- Institute of Nanoscience and Nanotechnology, National Center for Scientific Research “Demokritos”, 15341 Agia Paraskevi, Greece; (E.S.); (E.X.); (N.B.); (A.D.)
| | - Vlassis Likodimos
- Section of Condensed Matter Physics, Department of Physics, University Campus, National and Kapodistrian University of Athens, 15784 Athens, Greece; (M.P.); (A.T.); (S.G.)
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8
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Kaminari A, Nikoli E, Athanasopoulos A, Sakellis E, Sideratou Z, Tsiourvas D. Engineering Mitochondriotropic Carbon Dots for Targeting Cancer Cells. Pharmaceuticals (Basel) 2021; 14:ph14090932. [PMID: 34577632 PMCID: PMC8470554 DOI: 10.3390/ph14090932] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2021] [Revised: 09/10/2021] [Accepted: 09/13/2021] [Indexed: 12/14/2022] Open
Abstract
Aiming to understand and enhance the capacity of carbon dots (CDs) to transport through cell membranes and target subcellular organelles—in particular, mitochondria—a series of nitrogen-doped CDs were prepared by the one-step microwave-assisted pyrolysis of citric acid and ethylenediamine. Following optimization of the reaction conditions for maximum fluorescence, functionalization at various degrees with alkylated triphenylphosphonium functional groups of two different alkyl chain lengths afforded a series of functionalized CDs that exhibited either lysosome or mitochondria subcellular localization. Further functionalization with rhodamine B enabled enhanced fluorescence imaging capabilities in the visible spectrum and allowed the use of low quantities of CDs in relevant experiments. It was thus possible, by the appropriate selection of the alkyl chain length and degree of functionalization, to attain successful mitochondrial targeting, while preserving non-toxicity and biocompatibility. In vitro cell experiments performed on normal as well as cancer cell lines proved their non-cytotoxic character and imaging potential, even at very low concentrations, by fluorescence microscopy. Precise targeting of mitochondria is feasible with carefully designed CDs that, furthermore, are specifically internalized in cells and cell mitochondria of high transmembrane potential and thus exhibit selective uptake in malignant cells compared to normal cells.
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Affiliation(s)
- Archontia Kaminari
- National Centre for Scientific Research “Demokritos”, Institute of Nanoscience and Nanotechnology, 15310 Aghia Paraskevi, Greece; (A.K.); (E.N.); (E.S.); (Z.S.)
| | - Eleni Nikoli
- National Centre for Scientific Research “Demokritos”, Institute of Nanoscience and Nanotechnology, 15310 Aghia Paraskevi, Greece; (A.K.); (E.N.); (E.S.); (Z.S.)
| | - Alexandros Athanasopoulos
- National Centre for Scientific Research “Demokritos”, Institute of Biosciences and Applications, 15310 Aghia Paraskevi, Greece;
| | - Elias Sakellis
- National Centre for Scientific Research “Demokritos”, Institute of Nanoscience and Nanotechnology, 15310 Aghia Paraskevi, Greece; (A.K.); (E.N.); (E.S.); (Z.S.)
| | - Zili Sideratou
- National Centre for Scientific Research “Demokritos”, Institute of Nanoscience and Nanotechnology, 15310 Aghia Paraskevi, Greece; (A.K.); (E.N.); (E.S.); (Z.S.)
| | - Dimitris Tsiourvas
- National Centre for Scientific Research “Demokritos”, Institute of Nanoscience and Nanotechnology, 15310 Aghia Paraskevi, Greece; (A.K.); (E.N.); (E.S.); (Z.S.)
- Correspondence: ; Tel.: +30-210-650-3616
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9
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Lyra KM, Kaminari A, Panagiotaki KN, Spyrou K, Papageorgiou S, Sakellis E, Katsaros FK, Sideratou Z. Multi-Walled Carbon Nanotubes Decorated with Guanidinylated Dendritic Molecular Transporters: An Efficient Platform for the Selective Anticancer Activity of Doxorubicin. Pharmaceutics 2021; 13:858. [PMID: 34207727 PMCID: PMC8226981 DOI: 10.3390/pharmaceutics13060858] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2021] [Revised: 06/02/2021] [Accepted: 06/03/2021] [Indexed: 12/25/2022] Open
Abstract
An efficient doxorubicin (DOX) drug delivery system with specificity against tumor cells was developed, based on multi-walled carbon nanotubes (MWCNTs) functionalized with guanidinylated dendritic molecular transporters. Acid-treated MWCNTs (oxCNTs) interacted both electrostatically and through hydrogen bonding and van der Waals attraction forces with guanidinylated derivatives of 5000 and 25,000 Da molecular weight hyperbranched polyethyleneimine (GPEI5K and GPEI25K). Chemical characterization of these GPEI-functionalized oxCNTs revealed successful decoration with GPEIs all over the oxCNTs sidewalls, which, due to the presence of guanidinium groups, gave them aqueous compatibility and, thus, exceptional colloidal stability. These GPEI-functionalized CNTs were subsequently loaded with DOX for selective anticancer activity, yielding systems of high DOX loading, up to 99.5% encapsulation efficiency, while the DOX-loaded systems exhibited pH-triggered release and higher therapeutic efficacy compared to that of free DOX. Most importantly, the oxCNTs@GPEI5K-DOX system caused high and selective toxicity against cancer cells in a non-apoptotic, fast and catastrophic manner that cancer cells cannot recover from. Therefore, the oxCNTs@GPEI5K nanocarrier was found to be a potent and efficient nanoscale DOX delivery system, exhibiting high selectivity against cancerous cells, thus constituting a promising candidate for cancer therapy.
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Affiliation(s)
- Kyriaki-Marina Lyra
- Institute of Nanoscience and Nanotechnology, National Center for Scientific Reasearch ‘‘Demokritos”, 15310 Aghia Paraskevi, Greece; (K.-M.L.); (A.K.); (K.N.P.); (S.P.); (E.S.); (F.K.K.)
| | - Archontia Kaminari
- Institute of Nanoscience and Nanotechnology, National Center for Scientific Reasearch ‘‘Demokritos”, 15310 Aghia Paraskevi, Greece; (K.-M.L.); (A.K.); (K.N.P.); (S.P.); (E.S.); (F.K.K.)
| | - Katerina N. Panagiotaki
- Institute of Nanoscience and Nanotechnology, National Center for Scientific Reasearch ‘‘Demokritos”, 15310 Aghia Paraskevi, Greece; (K.-M.L.); (A.K.); (K.N.P.); (S.P.); (E.S.); (F.K.K.)
| | - Konstantinos Spyrou
- Department of Material Science & Engineering, University of Ioannina, 45110 Ioannina, Greece;
| | - Sergios Papageorgiou
- Institute of Nanoscience and Nanotechnology, National Center for Scientific Reasearch ‘‘Demokritos”, 15310 Aghia Paraskevi, Greece; (K.-M.L.); (A.K.); (K.N.P.); (S.P.); (E.S.); (F.K.K.)
| | - Elias Sakellis
- Institute of Nanoscience and Nanotechnology, National Center for Scientific Reasearch ‘‘Demokritos”, 15310 Aghia Paraskevi, Greece; (K.-M.L.); (A.K.); (K.N.P.); (S.P.); (E.S.); (F.K.K.)
| | - Fotios K. Katsaros
- Institute of Nanoscience and Nanotechnology, National Center for Scientific Reasearch ‘‘Demokritos”, 15310 Aghia Paraskevi, Greece; (K.-M.L.); (A.K.); (K.N.P.); (S.P.); (E.S.); (F.K.K.)
| | - Zili Sideratou
- Institute of Nanoscience and Nanotechnology, National Center for Scientific Reasearch ‘‘Demokritos”, 15310 Aghia Paraskevi, Greece; (K.-M.L.); (A.K.); (K.N.P.); (S.P.); (E.S.); (F.K.K.)
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10
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Apostolaki MA, Toumazatou A, Antoniadou M, Sakellis E, Xenogiannopoulou E, Gardelis S, Boukos N, Falaras P, Dimoulas A, Likodimos V. Graphene Quantum Dot-TiO 2 Photonic Crystal Films for Photocatalytic Applications. Nanomaterials (Basel) 2020; 10:nano10122566. [PMID: 33371303 PMCID: PMC7766274 DOI: 10.3390/nano10122566] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/23/2020] [Revised: 12/17/2020] [Accepted: 12/18/2020] [Indexed: 11/25/2022]
Abstract
Photonic crystal structuring has emerged as an advanced method to enhance solar light harvesting by metal oxide photocatalysts along with rational compositional modifications of the materials’ properties. In this work, surface functionalization of TiO2 photonic crystals by blue luminescent graphene quantum dots (GQDs), n–π* band at ca. 350 nm, is demonstrated as a facile, environmental benign method to promote photocatalytic activity by the combination of slow photon-assisted light trapping with GQD-TiO2 interfacial electron transfer. TiO2 inverse opal films fabricated by the co-assembly of polymer colloidal spheres with a hydrolyzed titania precursor were post-modified by impregnation in aqueous GQDs suspension without any structural distortion. Photonic band gap engineering by varying the inverse opal macropore size resulted in selective performance enhancement for both salicylic acid photocatalytic degradation and photocurrent generation under UV–VIS and visible light, when red-edge slow photons overlapped with the composite’s absorption edge, whereas stop band reflection was attenuated by the strong UVA absorbance of the GQD-TiO2 photonic films. Photoelectrochemical and photoluminescence measurements indicated that the observed improvement, which surpassed similarly modified benchmark mesoporous P25 TiO2 films, was further assisted by GQDs electron acceptor action and visible light activation to a lesser extent, leading to highly efficient photocatalytic films.
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Affiliation(s)
- Maria-Athina Apostolaki
- Section of Condensed Matter Physics, Department of Physics, National and Kapodistrian University of Athens, Panepistimiopolis Zografou, GR-15784 Athens, Greece; (M.-A.A.); (A.T.); (S.G.)
| | - Alexia Toumazatou
- Section of Condensed Matter Physics, Department of Physics, National and Kapodistrian University of Athens, Panepistimiopolis Zografou, GR-15784 Athens, Greece; (M.-A.A.); (A.T.); (S.G.)
| | - Maria Antoniadou
- Institute of Nanoscience and Nanotechnology, National Center for Scientific Research “Demokritos”, Agia Paraskevi, 15341 Athens, Greece; (M.A.); (E.S.); (E.X.); (N.B.); (P.F.); (A.D.)
| | - Elias Sakellis
- Institute of Nanoscience and Nanotechnology, National Center for Scientific Research “Demokritos”, Agia Paraskevi, 15341 Athens, Greece; (M.A.); (E.S.); (E.X.); (N.B.); (P.F.); (A.D.)
| | - Evangelia Xenogiannopoulou
- Institute of Nanoscience and Nanotechnology, National Center for Scientific Research “Demokritos”, Agia Paraskevi, 15341 Athens, Greece; (M.A.); (E.S.); (E.X.); (N.B.); (P.F.); (A.D.)
| | - Spiros Gardelis
- Section of Condensed Matter Physics, Department of Physics, National and Kapodistrian University of Athens, Panepistimiopolis Zografou, GR-15784 Athens, Greece; (M.-A.A.); (A.T.); (S.G.)
| | - Nikos Boukos
- Institute of Nanoscience and Nanotechnology, National Center for Scientific Research “Demokritos”, Agia Paraskevi, 15341 Athens, Greece; (M.A.); (E.S.); (E.X.); (N.B.); (P.F.); (A.D.)
| | - Polycarpos Falaras
- Institute of Nanoscience and Nanotechnology, National Center for Scientific Research “Demokritos”, Agia Paraskevi, 15341 Athens, Greece; (M.A.); (E.S.); (E.X.); (N.B.); (P.F.); (A.D.)
| | - Athanasios Dimoulas
- Institute of Nanoscience and Nanotechnology, National Center for Scientific Research “Demokritos”, Agia Paraskevi, 15341 Athens, Greece; (M.A.); (E.S.); (E.X.); (N.B.); (P.F.); (A.D.)
| | - Vlassis Likodimos
- Section of Condensed Matter Physics, Department of Physics, National and Kapodistrian University of Athens, Panepistimiopolis Zografou, GR-15784 Athens, Greece; (M.-A.A.); (A.T.); (S.G.)
- Correspondence: ; Tel.: +30-2107276824
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Heliopoulos NS, Kythreoti G, Lyra KM, Panagiotaki KN, Papavasiliou A, Sakellis E, Papageorgiou S, Kouloumpis A, Gournis D, Katsaros FK, Stamatakis K, Sideratou Z. Cytotoxicity Effects of Water-Soluble Multi-Walled Carbon Nanotubes Decorated with Quaternized Hyperbranched Poly(ethyleneimine) Derivatives on Autotrophic and Heterotrophic Gram-Negative Bacteria. Pharmaceuticals (Basel) 2020; 13:E293. [PMID: 33036144 PMCID: PMC7601344 DOI: 10.3390/ph13100293] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2020] [Revised: 09/30/2020] [Accepted: 10/01/2020] [Indexed: 02/07/2023] Open
Abstract
Oxidized multi-walled carbon nanotubes (oxCNTs) were functionalized by a simple non-covalent modification procedure using quaternized hyperbranched poly(ethyleneimine) derivatives (QPEIs), with various quaternization degrees. Structural characterization of these hybrids using a variety of techniques, revealed the successful and homogenous anchoring of QPEIs on the oxCNTs' surface. Moreover, these hybrids efficiently dispersed in aqueous media, forming dispersions with excellent aqueous stability for over 12 months. Their cytotoxicity effect was investigated on two types of gram(-) bacteria, an autotrophic (cyanobacterium Synechococcus sp. PCC 7942) and a heterotrophic (bacterium Escherichia coli). An enhanced, dose-dependent antibacterial and anti-cyanobacterial activity against both tested organisms was observed, increasing with the quaternization degree. Remarkably, in the photosynthetic bacteria it was shown that the hybrid materials affect their photosynthetic apparatus by selective inhibition of the Photosystem-I electron transport activity. Cytotoxicity studies on a human prostate carcinoma DU145 cell line and 3T3 mouse fibroblasts revealed that all hybrids exhibit high cytocompatibility in the concentration range, in which they also exhibit both high antibacterial and anti-cyanobacterial activity. Thus, QPEI-functionalized oxCNTs can be very attractive candidates as antibacterial and anti-cyanobacterial agents that can be used for potential applications in the disinfection industry, as well as for the control of harmful cyanobacterial blooms.
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Affiliation(s)
- Nikolaos S. Heliopoulos
- Institute of Nanoscience and Nanotechnology, National Centre of Scientific Research ‘‘Demokritos”, 15310 Aghia Paraskevi, Greece; (N.S.H.); (G.K.); (K.M.L.); (K.N.P.); (A.P.); (E.S.); (S.P.); (F.K.K.)
- Department of Industrial Design & Production Engineering, University of West Attica, 12241 Egaleo, Attiki, Greece
| | - Georgia Kythreoti
- Institute of Nanoscience and Nanotechnology, National Centre of Scientific Research ‘‘Demokritos”, 15310 Aghia Paraskevi, Greece; (N.S.H.); (G.K.); (K.M.L.); (K.N.P.); (A.P.); (E.S.); (S.P.); (F.K.K.)
- Institute of Biosciences and Applications, National Centre of Scientific Research ‘‘Demokritos”, 15310 Aghia Paraskevi, Greece;
| | - Kyriaki Marina Lyra
- Institute of Nanoscience and Nanotechnology, National Centre of Scientific Research ‘‘Demokritos”, 15310 Aghia Paraskevi, Greece; (N.S.H.); (G.K.); (K.M.L.); (K.N.P.); (A.P.); (E.S.); (S.P.); (F.K.K.)
| | - Katerina N. Panagiotaki
- Institute of Nanoscience and Nanotechnology, National Centre of Scientific Research ‘‘Demokritos”, 15310 Aghia Paraskevi, Greece; (N.S.H.); (G.K.); (K.M.L.); (K.N.P.); (A.P.); (E.S.); (S.P.); (F.K.K.)
| | - Aggeliki Papavasiliou
- Institute of Nanoscience and Nanotechnology, National Centre of Scientific Research ‘‘Demokritos”, 15310 Aghia Paraskevi, Greece; (N.S.H.); (G.K.); (K.M.L.); (K.N.P.); (A.P.); (E.S.); (S.P.); (F.K.K.)
| | - Elias Sakellis
- Institute of Nanoscience and Nanotechnology, National Centre of Scientific Research ‘‘Demokritos”, 15310 Aghia Paraskevi, Greece; (N.S.H.); (G.K.); (K.M.L.); (K.N.P.); (A.P.); (E.S.); (S.P.); (F.K.K.)
| | - Sergios Papageorgiou
- Institute of Nanoscience and Nanotechnology, National Centre of Scientific Research ‘‘Demokritos”, 15310 Aghia Paraskevi, Greece; (N.S.H.); (G.K.); (K.M.L.); (K.N.P.); (A.P.); (E.S.); (S.P.); (F.K.K.)
| | - Antonios Kouloumpis
- Department of Material Science & Engineering, University of Ioannina, 45110 Ioannina, Greece; (A.K.); (D.G.)
| | - Dimitrios Gournis
- Department of Material Science & Engineering, University of Ioannina, 45110 Ioannina, Greece; (A.K.); (D.G.)
| | - Fotios K. Katsaros
- Institute of Nanoscience and Nanotechnology, National Centre of Scientific Research ‘‘Demokritos”, 15310 Aghia Paraskevi, Greece; (N.S.H.); (G.K.); (K.M.L.); (K.N.P.); (A.P.); (E.S.); (S.P.); (F.K.K.)
| | - Kostas Stamatakis
- Institute of Biosciences and Applications, National Centre of Scientific Research ‘‘Demokritos”, 15310 Aghia Paraskevi, Greece;
| | - Zili Sideratou
- Institute of Nanoscience and Nanotechnology, National Centre of Scientific Research ‘‘Demokritos”, 15310 Aghia Paraskevi, Greece; (N.S.H.); (G.K.); (K.M.L.); (K.N.P.); (A.P.); (E.S.); (S.P.); (F.K.K.)
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12
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Stagni V, Kaminari A, Sideratou Z, Sakellis E, Vlahopoulos SA, Tsiourvas D. Targeting breast cancer stem-like cells using chloroquine encapsulated by a triphenylphosphonium-functionalized hyperbranched polymer. Int J Pharm 2020; 585:119465. [PMID: 32497731 DOI: 10.1016/j.ijpharm.2020.119465] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2020] [Revised: 05/19/2020] [Accepted: 05/20/2020] [Indexed: 01/07/2023]
Abstract
Cancer stem cells (CSCs) have garnered increasing attention over the past decade, as they are believed to play a crucial role in tumor progression and drug resistance. Accumulating evidence provides insight into the function of autophagy in maintenance and survival of CSCs. Here, we studied the impact of a mitochondriotropic triphenylphosphonium-functionalized dendrimeric nanocarrier on cultured breast cancer cell lines, grown either as adherent cells or as mammospheres that mimic a stem-like phenotype. The nanocarrier manifested a substantial cytotoxicity both alone as well as after encapsulation of chloroquine, a well-known autophagy inhibitor. The cytotoxic effects of the nanocarrier could be ascribed to interference with mitochondrial function. Importantly, mammospheres were selectively sensitive to encapsulated chloroquine and this depends on the expression of the gene encoding ATM kinase. Ataxia-telangiectasia mutated (ATM) kinase is an enzyme that functions as an essential signaling mediator that enables growth of cancer stem cells through the regulation of autophagy. We noted that this ATM-dependent sensitivity of mammospheres to encapsulated chloroquine was independent of the status of the tumor suppressor gene p53. Our study suggests that breast cancer stem cells, as they are modeled by mammospheres, are sensitive to encapsulated chloroquine, depending on the expression of the ATM kinase, which is thereby characterized as a potential biomarker for sensitivity to this type of treatment.
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Affiliation(s)
- Venturina Stagni
- Laboratory of Cell Signaling, Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS) Fondazione Santa Lucia, Rome, Italy; Institute of Molecular Biology and Pathology, National Research Council (CNR), Via DegliApuli 4, 00185 Rome, Italy.
| | - Archontia Kaminari
- Institute of Nanoscience and Nanotechnology, NCSR "Demokritos", 15310 Aghia Paraskevi, Greece
| | - Zili Sideratou
- Institute of Nanoscience and Nanotechnology, NCSR "Demokritos", 15310 Aghia Paraskevi, Greece
| | - Elias Sakellis
- Institute of Nanoscience and Nanotechnology, NCSR "Demokritos", 15310 Aghia Paraskevi, Greece
| | - Spiros A Vlahopoulos
- Ηoremeio Research Laboratory, First Department of Paediatrics, National and Kapodistrian University of Athens, 11527 Athens, Greece
| | - Dimitris Tsiourvas
- Institute of Nanoscience and Nanotechnology, NCSR "Demokritos", 15310 Aghia Paraskevi, Greece.
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Subrati A, Kim Y, Al Wahedi Y, Tzitzios V, Alhassan S, Kim HJ, Lee S, Sakellis E, Boukos N, Stephen S, Lee SM, Lee JB, Fardis M, Papavassiliou G. Monitoring the multiphasic evolution of bismuth telluride nanoplatelets. CrystEngComm 2020. [DOI: 10.1039/d0ce00719f] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Bismuth telluride hexagonal nanoplatelets originate from electronically distinct thicker Bi-rich triangular nanoplatelets while being centrally knitted by Te nanorods.
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Balis N, Zaky AA, Athanasekou C, Silva AMT, Sakellis E, Vasilopoulou M, Stergiopoulos T, Kontos AG, Falaras P. Investigating the role of reduced graphene oxide as a universal additive in planar perovskite solar cells. J Photochem Photobiol A Chem 2020. [DOI: 10.1016/j.jphotochem.2019.112141] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Papadakis D, Diamantopoulou A, Pantazopoulos PA, Palles D, Sakellis E, Boukos N, Stefanou N, Likodimos V. Nanographene oxide-TiO 2 photonic films as plasmon-free substrates for surface-enhanced Raman scattering. Nanoscale 2019; 11:21542-21553. [PMID: 31687726 DOI: 10.1039/c9nr07680h] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The development of nanostructured semiconductors with tailored morphology and electronic properties for surface-enhanced Raman scattering (SERS) has been attracting significant attention as a promising alternative to conventional coinage metal SERS substrates. In this work, functionalized TiO2 photonic crystals by graphene oxide nanocolloids (nanoGO) are demonstrated as highly sensitive, recyclable, plasmon-free SERS substrates that combine slow-photon amplification effects with the high adsorption capacity and surface reactivity of GO nanosheets. Comparative evaluation of photonic band gap engineered nanoGO-TiO2 inverse opal films was performed on methylene blue SERS detection under different laser excitations in combination with rigorous theoretical simulations of the photonic band structure. A very low detection limit of 6 × 10-7 M and an enhancement factor of 5 × 104 along with excellent self-cleaning performance and reusability could be achieved by the interplay of slow-photon effects assisted by interfacial charge transfer between the analyte and the nanoGO-TiO2 semiconducting substrate. Slow-photon management in combination with judicious engineering of chemical enhancement in photonic nanostructures is accordingly proposed as an advanced approach for the design of efficient dielectric SERS substrates.
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Affiliation(s)
- Dimitrios Papadakis
- Section of Solid State Physics, Department of Physics, National and Kapodistrian University of Athens, Panepistimiopolis, 15784, Greece.
| | - Angeliki Diamantopoulou
- Section of Solid State Physics, Department of Physics, National and Kapodistrian University of Athens, Panepistimiopolis, 15784, Greece.
| | - Petros Andreas Pantazopoulos
- Section of Solid State Physics, Department of Physics, National and Kapodistrian University of Athens, Panepistimiopolis, 15784, Greece.
| | - Dimitrios Palles
- Theoretical and Physical Chemistry Institute, National Hellenic Research Foundation, 48 Vassileos Constantinou Avenue, 11635 Athens, Greece
| | - Elias Sakellis
- Institute of Nanoscience and Nanotechnology, National Center for Scientific Research "Demokritos", 15341 Agia Paraskevi, Athens, Greece
| | - Nikos Boukos
- Institute of Nanoscience and Nanotechnology, National Center for Scientific Research "Demokritos", 15341 Agia Paraskevi, Athens, Greece
| | - Nikolaos Stefanou
- Section of Solid State Physics, Department of Physics, National and Kapodistrian University of Athens, Panepistimiopolis, 15784, Greece.
| | - Vlassis Likodimos
- Section of Solid State Physics, Department of Physics, National and Kapodistrian University of Athens, Panepistimiopolis, 15784, Greece.
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Theodosiou M, Boukos N, Sakellis E, Zachariadis M, Efthimiadou EK. Gold nanoparticle decorated pH-sensitive polymeric nanocontainers as a potential theranostic agent. Colloids Surf B Biointerfaces 2019; 183:110420. [DOI: 10.1016/j.colsurfb.2019.110420] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2019] [Revised: 07/29/2019] [Accepted: 08/02/2019] [Indexed: 01/06/2023]
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Diamantopoulou A, Sakellis E, Gardelis S, Tsoutsou D, Glenis S, Boukos N, Dimoulas A, Likodimos V. Advanced Photocatalysts Based on Reduced Nanographene Oxide-TiO 2 Photonic Crystal Films. Materials (Basel) 2019; 12:ma12162518. [PMID: 31394874 PMCID: PMC6720929 DOI: 10.3390/ma12162518] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/30/2019] [Revised: 07/31/2019] [Accepted: 08/05/2019] [Indexed: 02/05/2023]
Abstract
Surface functionalization of TiO2 inverse opals by graphene oxide nanocolloids (nanoGO) presents a promising modification for the development of advanced photocatalysts that combine slow photon-assisted light harvesting, surface area, and mass transport of macroporous photonic structures with the enhanced adsorption capability, surface reactivity, and charge separation of GO nanosheets. In this work, post-thermal reduction of nanoGO–TiO2 inverse opals was investigated in order to explore the role of interfacial electron transfer vs. pollutant adsorption and improve their photocatalytic activity. Photonic band gap-engineered TiO2 inverse opals were fabricated by the coassembly technique and were functionalized by GO nanosheets and reduced under He at 200 and 500 °C. Comparative performance evaluation of the nanoGO–TiO2 films on methylene blue photodegradation under UV-VIS and visible light showed that thermal reduction at 200 °C, in synergy with slow photon effects, improved the photocatalytic reaction rate despite the loss of nanoGO and oxygen functional groups, pointing to enhanced charge separation. This was further supported by photoluminescence spectroscopy and salicylic acid UV-VIS photodegradation, where, in the absence of photonic effects, the photocatalytic activity increased, confirming that fine-tuning of interfacial coupling between TiO2 and reduced nanoGO is a key factor for the development of highly efficient photocatalytic films.
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Affiliation(s)
- Angeliki Diamantopoulou
- Section of Solid State Physics, Department of Physics, National and Kapodistrian University of Athens, Panepistimiopolis, 15784 Ilissia, Greece
| | - Elias Sakellis
- Institute of Nanoscience and Nanotechnology, National Center for Scientific Research "Demokritos", 15310 Agia Paraskevi, Greece
| | - Spiros Gardelis
- Section of Solid State Physics, Department of Physics, National and Kapodistrian University of Athens, Panepistimiopolis, 15784 Ilissia, Greece
| | - Dimitra Tsoutsou
- Institute of Nanoscience and Nanotechnology, National Center for Scientific Research "Demokritos", 15310 Agia Paraskevi, Greece
| | - Spyridon Glenis
- Section of Solid State Physics, Department of Physics, National and Kapodistrian University of Athens, Panepistimiopolis, 15784 Ilissia, Greece
| | - Nikolaos Boukos
- Institute of Nanoscience and Nanotechnology, National Center for Scientific Research "Demokritos", 15310 Agia Paraskevi, Greece
| | - Athanasios Dimoulas
- Institute of Nanoscience and Nanotechnology, National Center for Scientific Research "Demokritos", 15310 Agia Paraskevi, Greece
| | - Vlassis Likodimos
- Section of Solid State Physics, Department of Physics, National and Kapodistrian University of Athens, Panepistimiopolis, 15784 Ilissia, Greece.
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Arfanis MK, Athanasekou CP, Sakellis E, Boukos N, Ioannidis N, Likodimos V, Sygellou L, Bouroushian M, Kontos AG, Falaras P. Photocatalytic properties of copper—Modified core-shell titania nanocomposites. J Photochem Photobiol A Chem 2019. [DOI: 10.1016/j.jphotochem.2018.10.051] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
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19
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Topoglidis E, Kolozoff PA, Tiflidis C, Papavasiliou J, Sakellis E. Adsorption and electrochemical behavior of Cyt-c on carbon nanotubes/TiO2 nanocomposite films fabricated at various annealing temperatures. Colloid Polym Sci 2018. [DOI: 10.1007/s00396-018-4358-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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