
Vassilios BinasFoundation for Research and Technology Hellas | forth · Institute of Electronic Structure and Laser (IESL)
Vassilios Binas
BSc, MSc, PhD
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76
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Publications (76)
Metal halide perovskites (MHPs) have attracted significant attention owing to their simple manufacturing process and unique optoelectronic properties. Their reversible electrical or optical property changes in response to oxidizing or reducing environments make them prospective materials for gas detection technologies. Despite advancements in perov...
Lead halide perovskites have attracted considerable attention as potential gas sensing elements due to their unique ability to detect and respond to an external stimulus with measurable electrical or optical signals. The distinctive characteristics of these materials lie in their ability to operate upon gas exposure at room temperature. However, th...
Commercial stainless steel is gaining interest as a promising, low-cost electrode material for green hydrogen production through water electrolysis in an alkaline environment. Herein, the electrocatalytic performance of 304-type stainless...
In the present work, symmetrical oxide ion conducting solid oxide single cells with inkjet-printed composite LSM-YSZ electrodes, onto commercially available YSZ dense substrates using GDC as buffer interlayer, were fabricated and characterized. Stable inkjet-printable LSM-YSZ nanoparticle inks were developed based on water solvent, after processing...
Heterogeneous photocatalysis is a promising technology for the degradation of environmental pollutants. In this work, g-C3N4 nanosheets were employed as a visible light photocatalyst to investigate the stability, kinetics and to understand the impact of humidity on the photocatalytic oxidation of nitric oxide (NO). Graphitic carbon nitride (g-C3N4)...
Synthesis of low-cost, eco-friendly, semiconducting solar-energy materials with excellent photocatalytic activity [high surface area, good reactant adsorption, photon harnessing in the visible region, and low charge recombination] for application in pollutant conversion to hydrogen is of great importance from environmental remediation as well as gr...
In this work, a solvent-free mechanochemical route is proposed as a direct salt precursor solid state synthesis for the mixed ionic-electronic conducting (MIEC) Lanthanum Strontium Titanium Manganese oxide perovskite (La0.5Sr0.5Ti0.5Mn0.5O3-δ, LSTM). The resulting mechanochemically synthesized powder is structurally and morphologically characterize...
Vanadium dioxide (VO2) is a well-known phase-changing material that goes from a semiconducting state to a metallic one at a critical temperature of 68 °C, which is the closest to room temperature (25 °C). The electrical transition is also accompanied by structural and optical changes. The optical transition upon heating-also known as thermochromism...
In the present work, the individual or synergistic effect of Ni-based catalysts (Ni/CeO2, Ni/Al2O3) and an eutectic carbonate salt mixture (MS) on the CO2 gasification performance of olive kernels was investigated. It was found that the Ni/CeO2 catalyst presented a relatively superior instant gasification reaction rate (Rco) compared to Ni/Al2O3, i...
Recent advances in atomically thin two dimensional (2D) anisotropic group IVA‐VI metal monochalcogenides (MMCs) and their fascinating intrinsic properties and potential applications are hampered due to an ongoing challenge of monolayer isolation. Among the most promising MMCs, tin (II) sulfide (SnS) is an earth‐abundant layered material with tunabl...
Monoclinic vanadium dioxide VO2(M) is a well-known thermochromic material, with its critical transition temperature (68 °C) being the closest to room temperature (RT). Among the variety of grown methods, hydrothermal synthesis is a simple and cost-effective technique to grow thermochromic VO2 in the form of powder. In the present work, VO2 nanopart...
This paper reports the fabrication of multifunctional composite cryogels that simultaneously remove oil and dye from polluted water through gravity-driven filtration. The cryogels were prepared via cryopolymerization of a poly(sodium acrylate) (PSA) and graphitic carbon nitride nanosheets (CNNs) mixture. Although the different CNNs concentrations t...
Physical processes working in parallel with digital ones have transformed the way we view systems and have led to the creation of applications that boost the quality of people’s lives, increase security as well as decrease production costs of goods. Critical to this evolution is the cost decrease in the components of such systems, among which are g...
The production of either CO or CH4 via the hydrogenation of CO2 is amongst the most promising routes for CO2 utilization. However, kinetic barriers necessitate the use of a catalyst, with Ni/CeO2 being one of the most investigated systems. Nevertheless, surface chemistry fine-tuning via appropriate promotional routes can induce significant modifica...
Solid oxide fuel cells (SOFCs) are high temperature galvanic devices able to electrochemically convert chemical energy of fuels to electrical energy at remarkably high efficiencies. However, several challenges, associated with the complexity, scalability, and cost of the current fabrication processes, remain to be resolved for their large‐scale dep...
Heterogeneous photocatalysis using semiconductor oxides such as TiO2, provides an up-and-coming solution for the degradation of environmental pollutants compared with other technologies. TiO2-containing construction materials and paints activated by UV/solar light destroy the ozone precursors NO and NO2 up to 80% and 30%, respectively. The majority...
The increasing air pollution taking place in virtue of human activity has a novel impact in our health. Heterogeneous photocatalysis is a promising way of degrading volatile organic compounds (VOCs) that makes the quest of new and improved photocatalysts of great importance. Herein, perovskite-related materials ATiO3 with A = Mg, Ni, Co, Zn were sy...
Hydrogen is attractive as an abundant source for clean and renewable energy. However, due to its highly flammable nature in a range of concentrations, the need for reliable and sensitive sensor/monitoring technologies has become acute. Here a solid-state hydrogen sensor based on solution-processable p-type semiconductor copper thiocyanate (CuSCN) i...
Highly-sensitive and stable ozone and hydrogen sensing elements were fabricated based on well-crystalline rounded cube-shaped CsPbBr3 microcrystals, synthesized by a facile solution process performed under ambient conditions. It is shown that such elements demonstrate enhanced room temperature gas sensing ability compared to the previously reported...
Al-doped NiO (NiO:Al) has attracted the interest of researchers due to its excellent optical and electrical properties. In this work, NiO:Al films were deposited on glass substrates by the radio frequencies (rf) sputtering technique at room temperature and they were tested against ozone gas. The Oxygen content in (Ar-O2) plasma was varied from 2% t...
The purpose of this chapter is to present recent developments on novel photocatalytic materials for indoor clean and healthy environments. Since we spend more than c. 85%–90% of our time indoors, substantial efforts have been made to investigate the photocatalytic impact of materials containing (TiO2) or modified (doped) TiO2 towards priority air p...
This mini-review article discusses the critical factors that are likely to affect the performance of solar photocatalysis for environmental applications and, in particular, for the simultaneous degradation of emerging micro-pollutants and the inactivation of microbial pathogens in aqueous matrices. Special emphasis is placed on the control of speci...
Highly stable ozone and hydrogen sensing elements were fabricated based on well-crystalline rounded cube-shaped CsPbBr$_3$ submicron crystals, synthesized by a facile solution process performed under ambient conditions. It is shown that such elements demonstrate enhanced room temperature gas sensing ability compared to the previously reported metal...
Heterogeneous photocatalysis using semiconductors, e.g. TiO2 as photocatalyst is a promising technology for the degradation of environmental pollutants. Preliminary evidence indicates that TiO2 containing construction materials and paints efficiently destroy the ozone precursors NO and NO2 up to 80% and 30% respectively. The materials and paints co...
Al-doped Nickel oxide (Al:NiO) nanostructured thin films, prepared by RF sputtering technique, were tested for NO2 gas detection. The films were deposited on alumina substrates with thicknesses ranging between 52 nm and 167 nm, while the at.% of Al was varied from 5.0% to 6.7%. The effect of the thickness on the morphological, structural and optica...
Porous CoxNi1-xTiO3 nanorods were successfully synthesized through a solution-based method following an ethylene glycol route at room temperature. The effect of calcination temperature from 300 °C to 900 °C for NiTiO3 and CoTiO3 nanorods was studied using X-ray diffractometry and scanning electron microscopy in order to investigate their structural...
Hydrogen (H2) is a well-known reduction gas and for safety reasons is very important to be detected. The most common systems employed along its detection are metal oxide-based elements. However, the latter demand complex and expensive manufacturing techniques, while they also need high temperatures or UV light to operate effectively. In this work,...
This work examined the photocatalytic destruction of sulfamethoxazole (SMX), a widely used antibiotic, under simulated solar radiation using iron-doped titanium dioxide as the photocatalyst. Amongst the various iron/titania ratios examined (in the range 0%–2%), the catalyst at 0.04% Fe/TiO2 molar ratio exhibited the highest photocatalytic efficienc...
Inkjet printing constitutes a cost-effective and energy-efficient deposition method for automated and accurate thin film fabrication and surface patterning, thus making it an advance technology that can be easily integrated into industrial production lines. In this current study the use of inkjet printing for the fabrication of the electrode films...
Vanadium dioxide is a well-studied thermochromic material, with a potential for integration in building materials such as concrete, clay, paints or glazings, in order to improve thermal efficiency on buildings, due to its passive temperature-dependent IR switching property. Major challenges such as cost-effective production, cost-efficient fabricat...
Ligand-free all-inorganic lead halide nanocubes have been investigated as ozone sensing materials operated at room temperature. It is found that the nanocubes, crystallined in the orthorhombic CsPbBr3 structure, can operate at room temperature, be self-powered and exhibit high sensitivity and remarkable repeatability. More important, they demonstra...
The fundamental development on the design of novel self-powered ozone sensing elements operating at room temperature based on p-type metal oxides pave the way to a new class of low cost highly promising gas sensing devices. Here, we synthesize a p-Type Cu2O nanocubes by a simple solution-based method and tested as self-power ozone sensing element,...
Vanadium dioxide (VO2) is a well-known thermochromic material that can potentially be used as a smart coating on glazing systems in order to regulate the internal temperature of buildings. Most growth techniques for VO2 demand high temperatures (>250 °C), making it impossible to comply with flexible (polymeric) substrates. To overcome this problem,...
Vanadium oxide (VxOy) nanostructured films were prepared by Aerosol Spray Pyrolysis technique with different
concentrations of precursor solution (0.005 M, 0.01 M, 0.02 M), using ammonium metavanadate (NH4VO3) as
precursor. The deposition was carried out onto glass substrates (Corning glass) at two different substrate temperatures
(300 °C and 400 °...
The photocatalytic oxidation of gaseous benzene, toluene and xylene (BTX) over un-doped, 0.1 and 1 wt% Mn-TiO2 nanoparticles under ultraviolet and visible irradiation was studied in atmosphere of synthetic air or inert gas. The photocatalytic decomposition efficiency and the oxidation products were determined using a Static Photochemical Reactor co...
This study demonstrates the photocatalytic decomposition of an indoor air pollutant, acetaldehyde (CH3CHO), over 0.04 mol% metal-doped TiO2 (Mn-, Co- and Mn/Co-) nanoparticles activated by ultraviolet and visible irradiation. The photocatalytic activity, the photodegradation kinetics, and the final product analysis were examined using a Static Phot...
For an ideal photocatalytic active building material, the substrate, on which the photocatalytic material is deposited, should neither interfere with nor affect its photocatalytic activity. In the present work, photocatalytic cement based coatings were immobilized on the surface of three different building substrates: gypsum, plywood and glass. The...
Hybrid lead halide spin coated perovskite films have been successfully tested as portable, flexible, operated at room temperature, self-powered and ultra-sensitive ozone sensing elements. The electrical resistance of the hybrid lead mixed halide perovskite (CH3NH3PbI3−xClx) sensing element, was immediately decreased when exposed to an ozone (O3) en...
The photocatalytic degradation of propyl paraben (PP) over Al-doped TiO2 suspensions under simulated solar radiation was investigated. The catalysts were prepared by a co-precipitation method with the dopant content varying from 0.04 to 2wt%. The catalyst with 0.04wt% dopant was more effective than the rest, presumably due to a more efficient separ...
CoxNi1-xTiO3 systems evaluated as photo- and electro-catalytic materials for oxygen evolution reaction (OER) from water have been studied. These materials have shown promising properties for this half-reaction both under (unbiased) visible-light photocatalytic approach in presence of an electron scavenger, and as electrocatalysts in dark conditions...
Hydrogen (H2 and methane (CH4 are two of the most well-known reducing gases with a wide range of uses. As a consequence, their detection becomes essential for safety reasons. Many metal oxides have been used as sensing materials in various sensing techniques, during last decades. In this work, r.f. sputtered p-type NiO thin films were tested agains...
Thermal switching has attracted the research
interest during the last decades. Phase Changing Materials
(PCM) have the ability to vary their electric conductivity upon
external stimuli such as heating and as a result they can be used
as thermal switchers in transmission lines. Vanadium dioxide
(VO2) is a PCM the electrical conductivity of which can...
The high deposition temperature of the order of 400 oC and more is requirement for the growth of the thermochromic phase of vanadium dioxide (VO2), limits the type of substrates that one may grow them on only to rigid ones. In this work, thermochromic VO2 films were successfully deposited on flexible Corning® Willow® glass substrates, without the u...
Advanced multifunctional sponge-type materials are obtained following chemical treatment of a Visible Light Photocatalyst (VLP) with an alkali aqueous solution under selected conditions. The resulting multifunctional material is fully characterized by XRD, SEM/EDX, TEM, FT-IR, RAMAN, and UV-Vis. It is found that the resulting material has high affi...
Ozone (O3) detection is of great interest for public safety and human health. In this work,
zinc oxide (ZnO) films were tested as sensing elements against different ozone concentrations.
The DC Magnetron Sputtering technique was employed to deposit ZnO films of various
thicknesses on both glass as well as commercial transducers, at room temperature...
Photocatalysis with modified titania is a promising approach to improve both air and health quality. Modified titania with novel photocatalytic properties under indoor light irradiation leads to smart coatings, which are benchmark materials suitable for their indoor applications. It is generally accepted that the photocatalytic activity is affected...
Photocatalytic powders in situ exposed on NH3 inside the X-Ray Photoelectron Spectroscopy chamber
The presence of pathogenic microorganisms in wastewater and their resistant nature to antibiotics impose effective disinfection treatment for public health and environmental protection. In this work, photocatalysis with metal-doped titania under artificial and natural sunlight, chlorination and UV-C irradiation were evaluated for their potential to...
Indium oxide (In2O3 thin films prepared by DC magnetron sputtering intended to be used as active layers for ozone sensing, demonstrating very high sensing response, were re-examined seven years after their fabrication date in terms of transmittance, surface structure, transport and sensing properties. Results revealed a noticeable characteristic of...
We report here on an alternative approach for forming p-type transparent conductive oxide ternary alloys Zn-Ir-O (ZIRO) by the means of rf magnetron co-sputtering of Ir and zinc nitride targets in a mixed argon and oxygen plasma. The structural and optical properties of ZIRO thin films formed on both glass and Si (100) substrates have been studied...
Klebsiella pneumoniae is considered an emerging pathogen persistent in extreme environmental and stressed conditions. The aim of the present study is the investigation of inactivation rates of this pathogen in water by means of heterogeneous photocatalytic treatment under solar irradiation and the induced genetic variance applying RAPD-PCR as a mol...
Mn-, Co-, and Mn-Co doped TiO2 ternary and quaternary semiconducting powder materials prepared by using the co-precipitation method and fully characterized by using x-ray diffraction (XRD), scanning electron microscopy-energy dispersive spectroscopy (SEM - EDS) and UV- visible diffuse reflection spectroscopy were utilized for the photocatalytic deg...
Novel hexagonal Periodic Mesoporous Organosilicas (PMOs) and Disordered Mesoporous Organosilicas (DMOs) were synthesized by hydrolysis of 1,4-bis(trialkoxylsilyl) benzene precursor in alkaline aqueous solutions of different alkyl-trimethyl ammonium cations and evaluated for their hydrogen storage capacity. The PMO materials exhibit regular hexagona...
a b s t r a c t Novel hexagonal Periodic Mesoporous Organosilicas (PMOs) and Disordered Mesoporous Organosilicas (DMOs) were synthesized by hydrolysis of 1,4-bis(trialkoxylsilyl) benzene precursor in alkaline aqueous solutions of different alkyl-trimethyl ammonium cations and evaluated for their hydrogen storage capacity. The PMO materials exhibit...
The present work evaluates the environmental impact and energy performance of Phase Change Materials (PCM) and Vacuum Insulations Panels (VIPs) for the first time in a building in Southeastern Europe. A Life Cycle Assessment (LCA) is developed for two Demo houses built in the premises of the Science and Technology Park of Crete (STEP-C) at Heraklio...
The removal of bisphenol A (BPA) under simulated solar irradiation and in the presence of either TiO2 or ZnO catalysts immobilized onto glass plates was investigated. The effect of various operating conditions on degradation was assessed including the amount of the immobilized catalyst (36.1–150.7 mg/cm2 for TiO2 and 0.5–6.8 mg/cm2 for ZnO), initia...
A straight forward, simple and inexpensive process has been developed by sol–gel method for the synthesis of manganese (Mn) doped and undoped TiO2 photocatalysts. X-ray powder diffractometry (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) revealed the presence of structural nanoparticles with an average nanocrys...