Spyros N. Yannopoulos
Foundation for Research & Technology – Hellas
SupercoolingAnalytical chemistryLight scatteringOpticsGlass transitionDynamic light scatteringChemical physicsRaman scatteringNanotechnologyChemistryScatteringMaterials scienceMolecular vibrationCondensed matter physicsChalcogenideRaman spectroscopyMolecular physicsChemical engineeringOptoelectronicsAmorphous solidCrystallography
145Publications
32H-index
2,713Citations
Publications 145
Newest
#1K. Govatsi (FORTH: Foundation for Research & Technology – Hellas)
#2G. Syrrokostas (FORTH: Foundation for Research & Technology – Hellas)H-Index: 12
Last. Stylianos G. Neophytides (FORTH: Foundation for Research & Technology – Hellas)H-Index: 31
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Abstract null null Undoped and aluminum-doped ZnO nanowire (NW) arrays with high aspect ratio and doping concentration up to 2.0 at.% in Al, were prepared by chemical bath deposition (CBD) technique onto FTO/glass substrates. The morphological, structural, and optical properties of the as-grown NWs were investigated by using electron microscopy, diffraction, and spectroscopic techniques. The prepared samples were used as photoanodes in a photoelectrochemical cell and their effectiveness for wate...
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#1Katerina GovatsiH-Index: 5
#2Aspasia AntonelouH-Index: 7
Last. Spyros N. YannopoulosH-Index: 32
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The rational synthesis of semiconducting materials with enhanced photoelectrocatalytic efficiency under visible light illumination is a long-standing issue. ZnO has been systematically explored in this field, as it offers the feasibility to grow a wide range of nanocrystal morphology; however, its wide band gap precludes visible light absorption. We report on a novel method for the controlled growth of semiconductor heterostructures and, in particular, core/sheath ZnO/MoS2 nanowire arrays and th...
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#1Elena Gkantzou (UoI: University of Ioannina)H-Index: 3
#2Katerina Govatsi (FORTH: Foundation for Research & Technology – Hellas)
Last. Haralambos Stamatis (UoI: University of Ioannina)H-Index: 35
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#1Michail Athanasiou (FORTH: Foundation for Research & Technology – Hellas)H-Index: 1
#2Nikolaos Samartzis (FORTH: Foundation for Research & Technology – Hellas)H-Index: 1
Last. Spyros N. Yannopoulos (FORTH: Foundation for Research & Technology – Hellas)H-Index: 32
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Abstract Preparing high-quality graphene-like structures and materials in a consistent and environmentally friendly way is still elusive. Recent advances have revealed that laser irradiation of proper precursors presents great potential and versatility towards realizing high-quality growth of graphene-like materials at low cost. Here, we present a detailed study of the laser-assisted transformation of homogenized dried Corinthian raisins (Vitis vinifera L., var. Apyrena) to graphene-like materia...
5 CitationsSource
#1Brixhilda Domi (UBU: University of Burgos)H-Index: 2
#2Kapil Bhorkar (FORTH: Foundation for Research & Technology – Hellas)H-Index: 3
Last. Juan Antonio Tamayo-Ramos (UBU: University of Burgos)H-Index: 12
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Abstract The utilization of tungsten disulfide (WS2) nanomaterials in distinct applications is raising due to their unique physico-chemical properties, such as low friction coefficient and high strength, which highlights the necessity to study their potential toxicological effects, due to the potential increase of environmental and human exposure. The aim of this work was to analyze commercially available aqueous dispersions of monolayer tungsten disulfide (2D WS2) nanomaterials with distinct la...
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#1Brixhilda Domi (UBU: University of Burgos)H-Index: 2
#2Kapil Bhorkar (FORTH: Foundation for Research & Technology – Hellas)H-Index: 3
Last. Juan Antonio Tamayo-Ramos (UBU: University of Burgos)H-Index: 12
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Boron nitride (BN) nanomaterials have been increasingly explored for potential applications in chemistry and biology fields (e.g., biomedical, pharmaceutical, and energy industries) due to their unique physico-chemical properties. However, their safe utilization requires a profound knowledge on their potential toxicological and environmental impact. To date, BN nanoparticles have been considered to have a high biocompatibility degree, but in some cases, contradictory results on their potential t...
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#1K. N. KoutrasH-Index: 2
#2Ioannis A. NaxakisH-Index: 5
Last. Spyros N. YannopoulosH-Index: 32
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This study addresses the effect of nanoparticles’ conductivity and surface charge on the dielectric performance of insulating nanofluids. Dispersions of alumina and silicon carbide nanoparticles of similar size (~50 nm) and concentration (0.004% w/w) were prepared in natural ester oil. The stability of the dispersions was explored by dynamic light scattering. AC, positive and negative lightning impulse breakdown voltage, as well as partial discharge inception voltage of the nanofluid samples wer...
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#1G. Syrrokostas (FORTH: Foundation for Research & Technology – Hellas)H-Index: 12
#2Alexandros Dokouzis (University of Patras)H-Index: 4
Last. George Leftheriotis (University of Patras)H-Index: 24
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Abstract In the present work, we propose for the first time, the use of a carbon-based perovskite solar cell (PSC) in a “partly covered” photoelectrochromic (PEC) device, with a three-electrode architecture that de-couples the photovoltaic (PV) and electrochromic (EC) operation, thus enabling better control of the device optical modulation. The proposed configuration also permits solar power production when the EC window remains idle at a given coloration state. The PSC unit of the devices consi...
3 CitationsSource
Last. Theophilos IoannidesH-Index: 35
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Thermosetting resins, such as poly (furfuryl alcohol), are efficient precursors for preparation of carbon membranes with molecular sieving properties. Polymerization of furfuryl alcohol is catalyzed by Bronsted or Lewis acids. FeCl3, showing Lewis-acid behavior, is an interesting polymerization catalyst, because it gets reduced into metallic iron during pyrolysis of the resin, promoting transformation of amorphous carbon into graphitic domains. The goal of the present work was to examine whether...
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#1K. N. Koutras (University of Patras)H-Index: 2
#2Ioannis A. Naxakis (University of Patras)H-Index: 5
Last. Spyros N. Yannopoulos (FORTH: Foundation for Research & Technology – Hellas)H-Index: 32
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Abstract The synthesis of insulating nanofluids by integration of nanoparticles in insulating oils has been employed over the last two decades by many researchers in an effort to improve both the dielectric strength and the thermal conductivity of dielectric liquids. In this paper, nanofluids with different volume concentrations of the nanoparticles were prepared by integration of semi-conductive TiO2 nanoparticles into natural ester oil. Ultra-sonication and magnetic stirring were used for prep...
10 CitationsSource