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Mihai C, Jipa F, Socol G, Kiss AE, Zamfirescu M, Velea A. Fs Laser Patterning of Amorphous As 2S 3 Thin Films. Materials (Basel) 2024; 17:798. [PMID: 38399048 PMCID: PMC10890152 DOI: 10.3390/ma17040798] [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] [Subscribe] [Scholar Register] [Received: 01/13/2024] [Revised: 02/03/2024] [Accepted: 02/06/2024] [Indexed: 02/25/2024]
Abstract
This study investigates the morphological changes induced by femtosecond (fs) laser pulses in arsenic trisulfide (As2S3) thin films and gold-arsenic trisulfide (Au\As2S3) heterostructures, grown by pulsed laser deposition (PLD). By means of a direct laser writing experimental setup, the films were systematically irradiated at various laser power and irradiation times to observe their effects on surface modifications. AFM was employed for morphological and topological characterization. Our results reveal a clear transition threshold between photoexpansion and photoevaporation phenomena under different femtosecond laser power regimes, occurring between 1 and 1.5 mW, irrespective of exposure time. Notably, the presence of a gold layer in the heterostructure minimally influenced this threshold. A maximum photoexpansion of 5.2% was obtained in As2S3 films, while the Au\As2S3 heterostructure exhibited a peak photoexpansion of 0.8%. The study also includes a comparative analysis of continuous-wave (cw) laser irradiation, confirming the efficiency of fs laser pulses in inducing photoexpansion effects.
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Affiliation(s)
- Claudia Mihai
- National Institute of Materials Physics, Atomistilor 405A, 077125 Magurele, Romania;
| | - Florin Jipa
- National Institute for Lasers, Plasma and Radiation Physics, Atomistilor 409, 077125 Magurele, Romania; (F.J.); (G.S.); (M.Z.)
| | - Gabriel Socol
- National Institute for Lasers, Plasma and Radiation Physics, Atomistilor 409, 077125 Magurele, Romania; (F.J.); (G.S.); (M.Z.)
| | - Adrian E. Kiss
- National Institute for Optoelectronics, INOE 2000, Atomistilor 409, 077125 Magurele, Romania;
| | - Marian Zamfirescu
- National Institute for Lasers, Plasma and Radiation Physics, Atomistilor 409, 077125 Magurele, Romania; (F.J.); (G.S.); (M.Z.)
| | - Alin Velea
- National Institute of Materials Physics, Atomistilor 405A, 077125 Magurele, Romania;
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Pana I, Parau AC, Dinu M, Kiss AE, Constantin LR, Vitelaru C. Development and Evaluation of Copper Based Transparent Heat Reflectors Obtained by Magnetron Sputtering. Nanomaterials (Basel) 2022; 12:3544. [PMID: 36234670 PMCID: PMC9565434 DOI: 10.3390/nano12193544] [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] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/13/2022] [Revised: 10/04/2022] [Accepted: 10/06/2022] [Indexed: 06/16/2023]
Abstract
Within the next few years climate change is likely to become a major concern for mankind. In addition, the current electronic components shortage crisis has led to an urgent need for alternative solutions in the main industry sectors (the raw materials, manufacturing, and construction industries). The current trends of research are focused on developing smart materials with functional properties, using abundant raw materials. The energy saving efforts are sustained in the glazing industries by several approaches based on dielectric-metal-dielectric multilayer structures. The use of silver to achieve a high reflectivity in near-infrared spectral range has been proposed and is already adopted as a commercially available solution. This work is focused on developing a transparent heat reflector (THR) with prefigured optical properties, using copper as a reflective layer, a material that is more abundant and cheaper than silver. The conductive copper layers obtained by the High Power Impulse Magnetron Sputtering (HiPIMS) method were interposed between two silicon nitride layers deposited by the Radio-Frequency Magnetron Sputtering (RFMS) technique. The structural, optical, and elemental composition of monolayers was investigated, qualifying each individual material for use in the multilayer structure. The time stability of films deposited on microscope glass substrates was also investigated, as an important criterion for the selection of monolayers. The obtained results revealed that the SiNx/Cu/SiNx with the Cu layer deposited by using a negative substrate bias of -100 V showed the most stable behavior over time. Optical modeling was performed to design a THR multilayer structure, which was successfully obtained experimentally. A maximum optical transparency as high as 75% in the visible range and a reflectivity of ~ 85% in near infrared spectral interval was confirmed for the experimentally obtained multilayer structures.
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Adochițe CȘ, Vițelaru C, Parau AC, Kiss AE, Pană I, Vlădescu A, Costinaș S, Moga M, Muntean R, Badea M, Idomir M. Synthesis and Investigation of Antibacterial Activity of Thin Films Based on TiO 2-Ag and SiO 2-Ag with Potential Applications in Medical Environment. Nanomaterials (Basel) 2022; 12:902. [PMID: 35335715 PMCID: PMC8955416 DOI: 10.3390/nano12060902] [Citation(s) in RCA: 2] [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] [Subscribe] [Scholar Register] [Received: 01/28/2022] [Revised: 03/02/2022] [Accepted: 03/05/2022] [Indexed: 12/14/2022]
Abstract
Multiple antibiotic resistance has now become a major obstacle to the treatment of infectious diseases. In this context, the application of nanotechnology in medicine is a promising alternative for the prevention of infections with multidrug-resistant germs. The use of silver as a powerful antibacterial agent has attracted much interest. TiO2 and SiO2 thin films enhanced with Ag particles have been developed with the aim of maintaining the transparency of the polymer films. Antibacterial activity was evaluated for a Gram-negative species-Escherichia coli-in concentrations of 105 and 104 CFU/mL in different conditions-activation by UV irradiation, single layer and double layer. Increased antibacterial efficacy of TiO2-deposited foil was found for the tests that had been exposed to UV activation. In the case of bilayer tests, the efficiency was higher compared to those in a single layer, as the contact surface between the films and the bacterial suspension increased. Films can be used as a potential method to limit bacterial growth on hospital surfaces, such as telephone screens and medical equipment, given their optimized characteristics and proven antibacterial efficacy.
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Affiliation(s)
- Cristina-Ș. Adochițe
- Faculty of Medicine, Transilvania University of Brasov, B-dul Eroilor nr 29, 500036 Brasov, Romania; (C.-Ș.A.); (S.C.); (M.M.); (M.I.)
| | - Cătălin Vițelaru
- National Institute of Research and Development for Optoelectronics-INOE 2000, 077125 Magurele, Romania; (A.C.P.); (A.E.K.); (I.P.); (A.V.)
| | - Anca C. Parau
- National Institute of Research and Development for Optoelectronics-INOE 2000, 077125 Magurele, Romania; (A.C.P.); (A.E.K.); (I.P.); (A.V.)
| | - Adrian E. Kiss
- National Institute of Research and Development for Optoelectronics-INOE 2000, 077125 Magurele, Romania; (A.C.P.); (A.E.K.); (I.P.); (A.V.)
| | - Iulian Pană
- National Institute of Research and Development for Optoelectronics-INOE 2000, 077125 Magurele, Romania; (A.C.P.); (A.E.K.); (I.P.); (A.V.)
| | - Alina Vlădescu
- National Institute of Research and Development for Optoelectronics-INOE 2000, 077125 Magurele, Romania; (A.C.P.); (A.E.K.); (I.P.); (A.V.)
- Physical Materials Science and Composite Materials Centre, Research School of Chemistry & Applied Biomedical Sciences, National Research Tomsk Polytechnic University, Lenin Avenue 43, 634050 Tomsk, Russia
| | - Sarah Costinaș
- Faculty of Medicine, Transilvania University of Brasov, B-dul Eroilor nr 29, 500036 Brasov, Romania; (C.-Ș.A.); (S.C.); (M.M.); (M.I.)
| | - Marius Moga
- Faculty of Medicine, Transilvania University of Brasov, B-dul Eroilor nr 29, 500036 Brasov, Romania; (C.-Ș.A.); (S.C.); (M.M.); (M.I.)
| | - Radu Muntean
- Faculty of Civil Engineering, Transilvania University of Brasov, B-dul Eroilor nr 29, 500036 Brasov, Romania;
| | - Mihaela Badea
- Faculty of Medicine, Transilvania University of Brasov, B-dul Eroilor nr 29, 500036 Brasov, Romania; (C.-Ș.A.); (S.C.); (M.M.); (M.I.)
| | - Mihaela Idomir
- Faculty of Medicine, Transilvania University of Brasov, B-dul Eroilor nr 29, 500036 Brasov, Romania; (C.-Ș.A.); (S.C.); (M.M.); (M.I.)
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