A. G. Chronis (Alexandros G. Chronis)

A. G. Chronis (Alexandros G. Chronis)

University of Patras

H-index: 5

Europe-Greece

About A. G. Chronis (Alexandros G. Chronis)

A. G. Chronis (Alexandros G. Chronis), With an exceptional h-index of 5 and a recent h-index of 5 (since 2020), a distinguished researcher at University of Patras, specializes in the field of Materials Science, Computational study.

His recent articles reflect a diverse array of research interests and contributions to the field:

Corrigendum to'Properties of medium hydrogenated beryllium nanoparticles' Journal of Nuclear Materials 566 (2022) 153782

Optical Properties of ScnYn (Y = N, P As) Nanoparticles

Interpretation of Localized Surface Plasmonic Resonances of Gold Nanoparticles Covered by Polymeric Coatings

Tight-binding method in electronic structure

Properties of medium hydrogenated beryllium nanoparticles

Calculation of the Localized Surface Plasmon Resonances of Au Nanoparticles Embedded in NiO

Structural and optical properties of Be, Mg and Ca nanorods and nanodisks

Structural and optical properties of exotic magnesium monochalcogenide nanoparticles

A. G. Chronis (Alexandros G. Chronis) Information

University

University of Patras

Position

Ph.D. Candidate Department of Materials Science School of Natural Sciences

Citations(all)

64

Citations(since 2020)

54

Cited By

10

hIndex(all)

5

hIndex(since 2020)

5

i10Index(all)

2

i10Index(since 2020)

2

Email

University Profile Page

University of Patras

A. G. Chronis (Alexandros G. Chronis) Skills & Research Interests

Materials Science

Computational study

Top articles of A. G. Chronis (Alexandros G. Chronis)

Corrigendum to'Properties of medium hydrogenated beryllium nanoparticles' Journal of Nuclear Materials 566 (2022) 153782

Authors

Alexandros G Chronis,Michael M Sigalas,François Virot,Marc Barrachin,Emmanuel N Koukaras,Aristides D Zdetsis

Journal

Journal of Nuclear Materials

Published Date

2023/11

The authors regret that Figure 5 was not updated during the Review process. As a result, the labels shown in the figure do not correspond to labels shown in Figure 4 that depict the investigated stable hydrogen insertion sites.

Optical Properties of ScnYn (Y = N, P As) Nanoparticles

Authors

Fotios I Michos,Alexandros G Chronis,Michail M Sigalas

Journal

Nanomaterials

Published Date

2023/9/19

In this work, using Density Functional Theory (DFT) and Time Dependent DFT, the absorption spectrum, the optical gap, and the binding energy of scandium pnictogen family nanoparticles (NPs) are examined. The calculated structures are created from an initial cubic-like building block of the form Sc4Y4, where Y = N, P, As after elongation along one and two perpendicular directions. The existence of stable structures over a wide range of morphologies was one of the main findings of this research, and this led to the study of several exotic NPs. The absorption spectrum of all the studied structures is within the visible spectrum, while the optical gap varies between 1.62 and 3 eV. These NPs could be used in the field in photovoltaics (quantum dot sensitized solar cells) and display applications.

Interpretation of Localized Surface Plasmonic Resonances of Gold Nanoparticles Covered by Polymeric Coatings

Authors

Alkeos Stamatelatos,Maria Tsarmpopoulou,Dimitrios Geralis,Alexandros G Chronis,Vagelis Karoutsos,Dimitrios Ntemogiannis,Dionysios M Maratos,Spyridon Grammatikopoulos,Mihail Sigalas,Panagiotis Poulopoulos

Journal

Photonics

Published Date

2023/4/5

Plasmonic materials currently have a plethora of applications. How would a dielectric matrix, such as diblock copolymers, tune plasmonic properties? In this work, self-assembled gold nanoparticles were fabricated in medium vacuum conditions on heated Corning glass substrates (kept at 440 °C) under the coexistence of argon and air by means of DC magnetron sputtering. These samples were compared structurally and optically to samples deposited at room temperature and post annealed. Subsequently, the better of the two preparations, those deposited on heated glass, were covered with three different polymers, namely: Polystyrene-block-polybutadiene-block-polystyrene (PS-b-PBD-b-PS); Polystyrene-co-methyl methacrylate (PS-co-PMMA); and Polystyrene-block-polyisoprene-block-polystyrene (PS-b-PI-b-PS), by means of spin coating. Localized surface plasmon resonances were recorded and analyzed, respectively, for polymer-covered gold nanoparticles, with the width, intensity, and position of the resonances changing according to multiple factors, such as the nanoparticles size and the refractive index of each polymer. Lastly, for purposes of justification and comparison with the experimental results, rigorous theoretical calculations have been carried out.

Tight-binding method in electronic structure

Authors

DA Papaconstantopoulos,MJ Mehl,AG Chronis,MM Sigalas

Published Date

2022/1/1

The Slater-Koster (SK) method was originally developed as a technique for interpolating first-principles energy bands from a limited number of k-points to a large one, for the purpose of accurately determining Fermi surfaces and densities of states. Numerous applications of the SK method have been made and extensions to include total energy determinations. One extension of the SK approach is the Naval Research Laboratory Tight-Binding (NRL-TB) method which has been very successful in fitting a set of first-principles electronic structure results and in addition being capable to predict properties that were not fitted and to also perform molecular dynamics simulations. This review presents a summary of applications using the NRL-TB scheme which covers most of the elements in the periodic Table and examples for multi-component systems.

Properties of medium hydrogenated beryllium nanoparticles

Authors

Alexandros G Chronis,Michael M Sigalas,François Virot,Marc Barrachin,Emmanuel N Koukaras,Aristides D Zdetsis

Journal

Journal of Nuclear Materials

Published Date

2022/8/1

The dust concern in ITER fusion facility calls for improvement of the knowledge of their fundamental properties because important safety issues are associated with them; including radiological hazard, toxicity as well as chemical reactivity in terms of explosion risks. Additional risk related to the particle class of nanometric size has to be futhermore consider due to their impact on biological environment since their production in fusion facility has been put in evidence. Specifically, although no data has been acquired on beryllium nanoparticles (NPs) and their reactivity within tritium, the aim of this present paper is to establish a first comprehensive picture of beryllium-hydrogen based nanoparticles. The structural and electronic properties of Be n and Be n H m NPs of “medium” sizes are investigated using Density Functional Theory calculations. Starting from bare NPs to find the relevant nanoparticle shape, the insertion …

Calculation of the Localized Surface Plasmon Resonances of Au Nanoparticles Embedded in NiO

Authors

Maria Tsarmpopoulou,Alexandros G Chronis,Mihail Sigalas,Alkeos Stamatelatos,Panagiotis Poulopoulos,Spyridon Grammatikopoulos

Journal

Solids

Published Date

2022/1/28

The present article examined the influence of size and periodicity of simulated gold (Au) nanoparticles (NPs) embedded in Nickel Oxide (NiO) matrix on localized plasmonic resonances (LSPRs). The scope of this work is to comparatively study the theoretical outcomes exhibited against the experimental results delivered from previous works, including a significant number of simulations and testing of numerous NPs diameter values. A comparison between Au and NiO NPs over silver (Ag) and NiO NPs is also reported to investigate whether the nature of noble metal affects its behavior in terms of LSPRs. The computational results strongly support that the appearance and intensity of LSPRs is straightforward to the increase in the diameter of NPs. The simulation results are in a good agreement with the literature of small NPs, offering the opportunity to further understand the LSPR phenomenon and its more effective implementation to opto-electronic applications. Rigorous Coupled Wave Analysis (RCWA) is performed to stimulate the justification and knowledge of the theoretical conclusions.

Structural and optical properties of Be, Mg and Ca nanorods and nanodisks

Authors

AG Chronis,FI Michos,CS Garoufalis,MM Sigalas

Journal

Physical Chemistry Chemical Physics

Published Date

2021

Nanorods and nanodisks of Be, Mg, and Ca with different shapes and sizes have been theoretically studied. Stable structures have been identified and their electronic and optical properties have been thoroughly examined by means of Density Functional Theory (DFT), Time Dependent DFT (TDDFT) and Real Time TDDFT (RT-TDDFT) calculations. The derived properties and trends are systematically compared to the corresponding ones of 0D structures revealing the effect of size and dimensionality. On top of that, the possible emergence of plasmonic behavior for intense resonance peaks of larger nanoparticles is also examined with the help of suitable transition contribution maps (TCM) and induced density isosurface plots.

Structural and optical properties of exotic magnesium monochalcogenide nanoparticles

Authors

Nikos Aravantinos-Zafiris,Alexandros G Chronis,Mihail M Sigalas

Journal

Materials Today Communications

Published Date

2021/9/1

In this work the structural and optical properties of magnesium monochalcogenide nanoparticles were numerically examined. The calculations were carried out by using Density Functional Theory and Time Dependent Density Functional Theory. All nanoparticles were created from an initial cubic-like building block of the form Mg 4 Y 4, where Y= S, Se, Te, after elongation along one, two and three perpendicular directions. Τhe Absorption Spectrum, the Binding Energy together with the highest occupied–lowest unoccupied molecular orbitals (HOMO-LUMO) gap, were included in the calculations of magnesium monochalcogenides. The existence of stable structures, over a wide range of morphologies, was one of the main findings of this research, and lead to the study of several exotic nanoparticles. Those nanoparticles may be used in several technological applications, such as gas storage.

On the localized surface plasmonic resonances of AgPd alloy nanoparticles by experiment and theory

Authors

Dimitrios Ntemogiannis,Maria Tsarmpopoulou,Alexandros G Chronis,Dimitrios I Anyfantis,Alexandros Barnasas,Spyridon Grammatikopoulos,Mihail Sigalas,Panagiotis Poulopoulos

Journal

Coatings

Published Date

2021/7/26

Ag/Pd multilayers and AgPd alloyed ultrathin films were deposited on Corning glass by magnetron sputtering. After being annealed in a furnace in air at 460 °C, self-assembled nanoparticles were formed. Localized surface plasmon resonances were observed only for the Ag-rich samples in the full range of the visible light spectrum. The resonance position was found to depend on the initial film thickness. In order to gain further physical insight, rigorous theoretical calculations were carried out via the rigid coupled-wave analysis method for the entire compositional range between Ag and Pd. Theoretical calculations were proven to be in suitable agreement with the experimental results.

Exotic nanoparticles of group IV monochalcogenides as anode materials for Li-Ion batteries

Authors

AG Chronis,E Karantagli,FI Michos,Christos S Garoufalis,MM Sigalas

Journal

Solid State Communications

Published Date

2021/6/1

By trying to investigate the suitability of 2D and 3D group IV monochalgenides nanoparticles (NPs) as host materials in LiBs, we examine different type of geometries and calculate the Li binding energies of those structures. Calculations based on the Density Functional Theory (DFT) have been used to find the optimized geometries and the adsorption energies for all examined structures. It is observed that the presence of Li in XnSn structures distorts their geometry, while the structures of the form XnYn, where X = Si, Ge, Sn, Pb and Y = Se, Te have a binding energy higher than the cohesive energy of pure Li and at the same time their geometry is not significantly affected by the migration of Li. Also, the diffusion barriers were calculated for selected structures.

Optical interpretation for plasmonic adjustment of nanostructured Ag-NiO thin films

Authors

A Stamatelatos,M Tsarmpopoulou,AG Chronis,N Kanistras,DI Anyfantis,E Violatzi,D Geralis,MM Sigalas,P Poulopoulos,S Grammatikopoulos

Journal

International Journal of Modern Physics B

Published Date

2021/3/10

Ultrathin Ag and Ni/NiO films are sequentially produced on Corning glass and silicon substrates by means of magnetron sputtering. Post annealing treatment in a furnace with air at C and C may lead to the formation of Ag nanostructures in NiO environment. Some of these samples present local surface plasmon resonances (SPRs). The sequence in which each layer is deposited, as well as, the state of the structure on which the layer is deposited, appears to play a pivotal role in the optical properties of these nanostructures, which are attributed to the growth properties of the nanocomposite thin films. Ultimately, rigorous theoretical calculations have been made for comparison and discussion with the experimental results.

Structures and Absorption Spectrum of 1D and 2D ZnS Nanoparticles

Authors

Spyros Papantzikos,Alexandos G Chronis,Fotios I Michos,Mihail M Sigalas

Journal

Current Nanomaterials

Published Date

2020/4/1

Background ZnS nanoparticles (NPs) are attractive for quantum dots applications because they consist of abundant and non-toxic elements. Their major drawback is that they absorb in the UV region, ultimately limiting their applications. Objective In the present study, 1D and 2D ZnS NPs have been found. The goal of this study is to find NPs that have absorption in the visible spectrum. Methods Calculations based on the Density Functional Theory (DFT) have been used to find the optimized geometries. Their absorption spectra have been calculated with the Time-Dependent DFT. Results Several shapes were examined, such as nanorod, and it is observed that these shapes move the absorption spectra in lower energies, into the visible spectrum, while the 3D NPs have absorption edges in the UV region. Conclusion NPs with the shape of nanorod in different directions showed that their absorption spectra moved to …

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A. G. Chronis (Alexandros G. Chronis) FAQs

What is A. G. Chronis (Alexandros G. Chronis)'s h-index at University of Patras?

The h-index of A. G. Chronis (Alexandros G. Chronis) has been 5 since 2020 and 5 in total.

What are A. G. Chronis (Alexandros G. Chronis)'s top articles?

The articles with the titles of

Corrigendum to'Properties of medium hydrogenated beryllium nanoparticles' Journal of Nuclear Materials 566 (2022) 153782

Optical Properties of ScnYn (Y = N, P As) Nanoparticles

Interpretation of Localized Surface Plasmonic Resonances of Gold Nanoparticles Covered by Polymeric Coatings

Tight-binding method in electronic structure

Properties of medium hydrogenated beryllium nanoparticles

Calculation of the Localized Surface Plasmon Resonances of Au Nanoparticles Embedded in NiO

Structural and optical properties of Be, Mg and Ca nanorods and nanodisks

Structural and optical properties of exotic magnesium monochalcogenide nanoparticles

...

are the top articles of A. G. Chronis (Alexandros G. Chronis) at University of Patras.

What are A. G. Chronis (Alexandros G. Chronis)'s research interests?

The research interests of A. G. Chronis (Alexandros G. Chronis) are: Materials Science, Computational study

What is A. G. Chronis (Alexandros G. Chronis)'s total number of citations?

A. G. Chronis (Alexandros G. Chronis) has 64 citations in total.

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