Výsledky vyhledávání - "Laura Velicu"

Akademický článek

Tantalum Oxynitride Thin Films: Assessment of the Photocatalytic Efficiency and Antimicrobial Capacity

Autor: Daniel Cristea, Luis Cunha, Camelia Gabor, Ioana Ghiuta, Catalin Croitoru, Alexandru Marin, Laura Velicu, Alexandra Besleaga, Bogdan Vasile

Publikováno v: Nanomaterials, Vol 9, Iss 3, p 476 (2019)

Tantalum oxynitride thin films have been deposited by reactive magnetron sputtering, using a fixed proportion reactive gas mixture (85% N2 + 15% O2). To produce the films, the partial pressure of the mixture in the working atmosphere was varied. The

Externí odkaz: https://doaj.org/article/333b1ec815944f60892171a05fb0940a

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Akademický článek

Band-gap engineering of zirconia by nitrogen doping in reactive HiPIMS: a step forward in developing innovative technologies for photocatalysts synthesis

Autor: Teodora Matei, Vasile Tiron, Roxana Jijie, Georgiana Bulai, Ioana-Laura Velicu, Daniel Cristea, Valentin Crăciun

Publikováno v: Frontiers in Chemistry, Vol 11 (2023)

In the global context of climate change and carbon neutrality, this work proposes a strategy to improve the light absorption of photocatalytic water-splitting materials into the visible spectrum by anion doping. In this framework, reactive high power

Externí odkaz: https://doaj.org/article/fd69c91434d74be8a1b5dfc5ca7e64a5

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Akademický článek

Room Temperature Deposition of Nanocrystalline SiC Thin Films by DCMS/HiPIMS Co-Sputtering Technique

Autor: Vasile Tiron, Elena-Laura Ursu, Daniel Cristea, Georgiana Bulai, George Stoian, Teodora Matei, Ioana-Laura Velicu

Publikováno v: Nanomaterials, Vol 12, Iss 3, p 512 (2022)

Due to an attractive combination of chemical and physical properties, silicon carbide (SiC) thin films are excellent candidates for coatings to be used in harsh environment applications or as protective coatings in heat exchanger applications. This w

Externí odkaz: https://doaj.org/article/92d094c5d20d494d9b6d0a1b68e4ad26

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Chlorine doping impact on the photocatalytic and antibacterial activity of sprayed In2S3 films

Autor: Mohamed Toumi, Belgacem Tiss, Noureddine Bouguila, Daniel Cristea, Catalin Croitoru, Ioana Ghiuta, Alexandru Horia Marin, Ioana Laura Velicu, Vasile Tiron, Valentin Craciun, Mabrouk Kraini, Sahbi Alaya, Cacilda Moura, Luis Cunha

Publikováno v: Surface Innovations. :1-13

In this study, the surface chemistry and morphology and the photocatalytic and antibacterial potential of pure and chlorine (Cl)-doped indium sulfide (In2S3) thin films, produced by spray pyrolysis, were analyzed. The root-mean-square roughness seeme

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::c3c426011f8b1413794f13670707d2e2
https://doi.org/10.1680/jsuin.22.01040

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Tantalum-Titanium Oxynitride Thin Films Deposited by DC Reactive Magnetron Co-Sputtering: Mechanical, Optical, and Electrical Characterization

Autor: Ioana-Laura Velicu, Eduardo Alves, Daniel Cristea, Valentin Craciun, Luís Cunha, Nuno Pessoa Barradas

Publikováno v: Coatings, Vol 12, Iss 36, p 36 (2022)
Coatings; Volume 12; Issue 1; Pages: 36
Repositório Científico de Acesso Aberto de Portugal
Repositório Científico de Acesso Aberto de Portugal (RCAAP)
instacron:RCAAP

The possibility to tune the elemental composition and structure of binary Me oxynitride-type compounds (Me1Me2ON) could lead to attractive properties for several applications. For this work, tantalum-titanium oxynitride (TaTiON) thin films were depos

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5c844e6144f2f331e22e150cadeeab5e
https://www.mdpi.com/2079-6412/12/1/36

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On the chemistry, photocatalytical, and corrosion behavior of co-sputtered tantalum and titanium oxynitride thin films

Autor: Daniel Cristea, Cătălin Croitoru, Alexandru Marin, Marius Dobromir, Elena Laura Ursu, Ioana Laura Velicu, Vasile Tiron, Valentin Crăciun, Luis Cunha

Direct current magnetron co-sputtered titanium and tantalum based oxynitride coatings (TaTiON) were analyzed in terms of their chemistry, surface morphology, surface energy, photocatalytic activity, and corrosion resistance. The variable parameter fo

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0f0115c9ea27805c9803924d4d80fca9
https://hdl.handle.net/1822/78979

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Effect of Pulsing Configuration and Magnetic Balance Degree on Mechanical Properties of CrN Coatings Deposited by Bipolar-HiPIMS onto Floating Substrate

Autor: Vasile Tiron, Mihai Alexandru Ciolan, Georgiana Bulai, Daniel Cristea, Ioana-Laura Velicu

Publikováno v: Coatings; Volume 11; Issue 12; Pages: 1526
Coatings, Vol 11, Iss 1526, p 1526 (2021)

Despite its great potential for thin films deposition and technological applications, the HiPIMS technology has its own limitations including the control of ion energy and flux towards the substrate when coping with the deposition of electrical insul

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::be58deca1a899cd6f5ceea818414508a

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Overcoming the insulating materials limitation in HiPIMS: Ion-assisted deposition of DLC coatings using bipolar HiPIMS

Autor: A. Ceban, Daniel Cristea, Daniel Munteanu, Ioana-Laura Velicu, Georgiana Bulai, Elena Laura Ursu, Vasile Tiron

Publikováno v: Applied Surface Science. 494:871-879

The present study aims to demonstrate that operating the HiPIMS discharge in bipolar regime (BP-HiPIMS) enables an energy-enhanced deposition process of high-quality hydrogen-free DLC thin films (high hardness, low coefficient of friction, good wear

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::6107a91df3df34328d33f1aad627ddff
https://doi.org/10.1016/j.apsusc.2019.07.239

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Energy-enhanced deposition of copper thin films by bipolar high power impulse magnetron sputtering

Autor: Alin Velea, Ilarion Mihaila, Daniel Cristea, Corneliu Porosnicu, Ioana-Laura Velicu, I. Burducea, Gabriela-Theodora Ianoş, Daniel Munteanu, Vasile Tiron

Publikováno v: Surface and Coatings Technology

Bipolar Pulse High Power Impulse Magnetron Sputtering (BP-HiPIMS) was investigated and used in this work to control the ion bombardment process of growing thin films and to improve their structure and properties. Energy-resolving mass spectroscopy wa

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5ea92840e77108e54faf6d13cccfa966
https://doi.org/10.1016/j.surfcoat.2018.12.079

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The effect of vacuum and air annealing in the physical characteristics and photocatalytic efficiency of In2S3:Ag thin films produced by spray pyrolysis

Autor: Luís Miguel Cunha, Daniel Cristea, B. Tiss, V. Craciun, Catalin Croitoru, P. Prepelita, M. Benfraj, M. Kraini, C.G. Moura, Ioana-Laura Velicu, N. Bouguila, D. Craciun, Vasile Tiron, S. Alaya

Publikováno v: Repositório Científico de Acesso Aberto de Portugal
Repositório Científico de Acesso Aberto de Portugal (RCAAP)
instacron:RCAAP

Indium sulfide thin films, doped with silver, were synthesized by spray pyrolysis technique. These samples were subsequently annealed in air and in vacuum, at the temperature of 400 ◦C, for 2 h. This work reports the effect of the thermal treatment

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::74aead1c28851e60466d855310d5665b

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