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Wan Z, Zhang TF, Ding JC, Kim CM, Park SW, Yang Y, Kim KH, Kwon SH. Enhanced Corrosion Resistance of PVD-CrN Coatings by ALD Sealing Layers. NANOSCALE RESEARCH LETTERS 2017; 12:248. [PMID: 28381072 PMCID: PMC5380549 DOI: 10.1186/s11671-017-2020-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/04/2017] [Accepted: 03/22/2017] [Indexed: 06/01/2023]
Abstract
Multilayered hard coatings with a CrN matrix and an Al2O3, TiO2, or nanolaminate-Al2O3/TiO2 sealing layer were designed by a hybrid deposition process combined with physical vapor deposition (PVD) and atomic layer deposition (ALD). The strategy was to utilize ALD thin films as pinhole-free barriers to seal the intrinsic defects to protect the CrN matrix. The influences of the different sealing layers added in the coatings on the microstructure, surface roughness, and corrosion behaviors were investigated. The results indicated that the sealing layer added by ALD significantly decreased the average grain size and improved the corrosion resistance of the CrN coatings. The insertion of the nanolaminate-Al2O3/TiO2 sealing layers resulted in a further increase in corrosion resistance, which was attributed to the synergistic effect of Al2O3 and TiO2, both acting as excellent passivation barriers to the diffusion of corrosive substances.
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Affiliation(s)
- Zhixin Wan
- The Institute of Materials Technology, Pusan National University, Busan, 46241 South Korea
| | - Teng Fei Zhang
- National Core Research Center for Hybrid Materials Solution, Pusan National University, Busan, 46241 South Korea
| | - Ji Cheng Ding
- School of Convergence Science, Pusan National University, Busan, 46241 South Korea
| | - Chang-Min Kim
- School of Materials Science and Engineering, Pusan National University, Busan, 46241 South Korea
| | - So-Won Park
- School of Materials Science and Engineering, Pusan National University, Busan, 46241 South Korea
| | - Yang Yang
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing, 210009 China
| | - Kwang-Ho Kim
- National Core Research Center for Hybrid Materials Solution, Pusan National University, Busan, 46241 South Korea
- School of Materials Science and Engineering, Pusan National University, Busan, 46241 South Korea
| | - Se-Hun Kwon
- School of Materials Science and Engineering, Pusan National University, Busan, 46241 South Korea
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Nica IC, Stan MS, Popa M, Chifiriuc MC, Pircalabioru GG, Lazar V, Dumitrescu I, Diamandescu L, Feder M, Baibarac M, Cernea M, Maraloiu VA, Popescu T, Dinischiotu A. Development and Biocompatibility Evaluation of Photocatalytic TiO₂/Reduced Graphene Oxide-Based Nanoparticles Designed for Self-Cleaning Purposes. NANOMATERIALS (BASEL, SWITZERLAND) 2017; 7:E279. [PMID: 28925946 PMCID: PMC5618390 DOI: 10.3390/nano7090279] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/04/2017] [Revised: 09/11/2017] [Accepted: 09/14/2017] [Indexed: 11/16/2022]
Abstract
Graphene is widely used in nanotechnologies to amplify the photocatalytic activity of TiO₂, but the development of TiO₂/graphene composites imposes the assessment of their risk to human and environmental health. Therefore, reduced graphene oxide was decorated with two types of TiO₂ particles co-doped with 1% iron and nitrogen, one of them being obtained by a simultaneous precipitation of Ti3+ and Fe3+ ions to achieve their uniform distribution, and the other one after a sequential precipitation of these two cations for a higher concentration of iron on the surface. Physico-chemical characterization, photocatalytic efficiency evaluation, antimicrobial analysis and biocompatibility assessment were performed for these TiO₂-based composites. The best photocatalytic efficiency was found for the sample with iron atoms localized at the sample surface. A very good anti-inhibitory activity was obtained for both samples against biofilms of Gram-positive and Gram-negative strains. Exposure of human skin and lung fibroblasts to photocatalysts did not significantly affect cell viability, but analysis of oxidative stress showed increased levels of carbonyl groups and advanced oxidation protein products for both cell lines after 48 h of incubation. Our findings are of major importance by providing useful knowledge for future photocatalytic self-cleaning and biomedical applications of graphene-based materials.
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Affiliation(s)
- Ionela Cristina Nica
- Department of Biochemistry and Molecular Biology, Faculty of Biology, University of Bucharest, 91-95 Splaiul Independentei, 050095 Bucharest, Romania.
| | - Miruna S Stan
- Department of Biochemistry and Molecular Biology, Faculty of Biology, University of Bucharest, 91-95 Splaiul Independentei, 050095 Bucharest, Romania.
| | - Marcela Popa
- Department of Botanic-Microbiology, Faculty of Biology, University of Bucharest, 1-3 Aleea Portocalelor, 060101 Bucharest, Romania.
- Research Institute of the University of Bucharest-ICUB, University of Bucharest, 91-95 Splaiul Independentei, 050095 Bucharest, Romania.
| | - Mariana Carmen Chifiriuc
- Department of Botanic-Microbiology, Faculty of Biology, University of Bucharest, 1-3 Aleea Portocalelor, 060101 Bucharest, Romania.
- Research Institute of the University of Bucharest-ICUB, University of Bucharest, 91-95 Splaiul Independentei, 050095 Bucharest, Romania.
| | - Gratiela G Pircalabioru
- Department of Botanic-Microbiology, Faculty of Biology, University of Bucharest, 1-3 Aleea Portocalelor, 060101 Bucharest, Romania.
- Research Institute of the University of Bucharest-ICUB, University of Bucharest, 91-95 Splaiul Independentei, 050095 Bucharest, Romania.
| | - Veronica Lazar
- Department of Botanic-Microbiology, Faculty of Biology, University of Bucharest, 1-3 Aleea Portocalelor, 060101 Bucharest, Romania.
| | - Iuliana Dumitrescu
- National R&D Institute for Textiles and Leather Bucharest (INCDTP), 16 Lucretiu Patrascanu, 030508 Bucharest, Romania.
| | - Lucian Diamandescu
- National Institute of Materials Physics (NIMP), Atomistilor 405A, 077125 Bucharest-Magurele, Romania.
| | - Marcel Feder
- National Institute of Materials Physics (NIMP), Atomistilor 405A, 077125 Bucharest-Magurele, Romania.
| | - Mihaela Baibarac
- National Institute of Materials Physics (NIMP), Atomistilor 405A, 077125 Bucharest-Magurele, Romania.
| | - Marin Cernea
- National Institute of Materials Physics (NIMP), Atomistilor 405A, 077125 Bucharest-Magurele, Romania.
| | - Valentin Adrian Maraloiu
- National Institute of Materials Physics (NIMP), Atomistilor 405A, 077125 Bucharest-Magurele, Romania.
| | - Traian Popescu
- National Institute of Materials Physics (NIMP), Atomistilor 405A, 077125 Bucharest-Magurele, Romania.
| | - Anca Dinischiotu
- Department of Biochemistry and Molecular Biology, Faculty of Biology, University of Bucharest, 91-95 Splaiul Independentei, 050095 Bucharest, Romania.
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