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Synthesis and microbiological analysis of polymer substrates coated with TiO2 and / or Al2O3 ultra-thin films by atomic layer deposition technology


Atomic layer deposition (ALD) has been shown to be an attractive technology to deposit thin films for many advanced applications from nanotechnology to biomedicine. This research project aims to investigate the growth and properties of atomic layer deposited titanium dioxide (TiO2) and/or aluminum oxide (Al2O3) thin films on polyurethane (PU), polydimethylsiloxane (PDMS) and polyvinyl chloride (PVC) substrates, and discusses their effect on the growth and inactivation process, in case of contamination, of the yeast of the genus Candida albicans. These substrates are often used in the synthesis of medical-hospital devices such as the long-term catheter, which may be susceptible to microbiological contamination. For these, the physical, chemical and antifungal assays will be evaluated. In the ALD process of the TiO2 film, TiCl4 and H2O will be used as precursors, whereas for the Al2O3 film, the Al(CH3)3 and H2O precursors will be used. All the processes will be carried out at a fixed temperature of 80 °C, while the number of the reaction cycle for film growth will be varied from 500 to 2000. The effect of the insertion of Al2O3 nanolayers on the TiO2 film will also be investigated. For biological analyses, yeasts of standards trains of C. albicans (ATCC 10231) will be grown on non-coated and coated substrates and then the antifungal and photocatalytic activities of the films will be investigated using colony-forming units (CFU) counts before and after UV-light treatment. Several chemical, physical and physical-chemistry techniques will be used to evaluate the growth kinetics, elemental composition, material structure, chemical bonds, contact angle, work of adhesion and surface morphology of the ALD thin films on both substrates. Finally, the development/construction of a cross-flow type ALD thermal reactor is proposed, as the researcher has acquired, in recent years, sufficient know-how in a commercial ALD machine (Beneq TFS-200, project FAPESP/PRONEX 2011/50773-0). This equipment will be developed considering a future treatment of three-dimensional substrates such as catheters. (AU)

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Scientific publications (8)
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
DIAS, V. M.; CHIAPPIM, W.; FRAGA, M. A.; MACIEL, H. S.; MARCIANO, F. R.; PESSOA, R. S. Atomic layer deposition of TiO2 and Al2O3 thin films for the electrochemical study of corrosion protection in aluminum alloy cans used in beverage. MATERIALS RESEARCH EXPRESS, v. 7, n. 7 JUL 2020. Web of Science Citations: 0.
DE SOUZA, P. R. F.; SOUZA, G. C. C.; PINTO, J. V. F. A.; DORIA, A. C. O. C.; NASCIMENTO, L. M.; GOMES, M. C.; DA SILVA SOBRINHO, A. S.; PETRACONI, G.; SAGAS, J. C.; RODRIGUES, B. V. M.; PESSOA, RODRIGO SAVIO. Effect of Ozone Exposure on Water Uptake and Germination of Lentil (Lens Culinaris) Seeds. OZONE-SCIENCE & ENGINEERING, v. 43, n. 1 APR 2020. Web of Science Citations: 0.
JUNIOR, ARMSTRONG GODOY; PEREIRA, ANDRE; GOMES, MARCILENE; FRAGA, MARIANA; PESSOA, RODRIGO; LEITE, DOUGLAS; PETRACONI, GILBERTO; NOGUEIRA, ADAILTON; WENDER, HEBERTON; MIYAKAWA, WALTER; MASSI, MARCOS; SOBRINHO, ARGEMIRO DA SILVA. Black TiO2 Thin Films Production Using Hollow Cathode Hydrogen Plasma Treatment: Synthesis, Material Characteristics and Photocatalytic Activity. CATALYSTS, v. 10, n. 3 MAR 2020. Web of Science Citations: 0.
CHIAPPIM, WILLIAM; WATANABE, MARCOS; DIAS, VANESSA; TESTONI, GIORGIO; RANGEL, RICARDO; FRAGA, MARIANA; MACIEL, HOMERO; DOS SANTOS FILHO, SEBASTIAO; PESSOA, RODRIGO. MOS Capacitance Measurements for PEALD TiO2 Dielectric Films Grown under Different Conditions and the Impact of Al2O3 Partial-Monolayer Insertion. NANOMATERIALS, v. 10, n. 2 FEB 2020. Web of Science Citations: 0.
GALVAO, NIERLLY; GUERINO, MARCIEL; CAMPOS, TIAGO; GRIGOROV, KORNELI; FRAGA, MARIANA; RODRIGUES, BRUNO; PESSOA, RODRIGO; CAMUS, JULIEN; DJOUADI, MOHAMMED; MACIEL, HOMERO. The Influence of AlN Intermediate Layer on the Structural and Chemical Properties of SiC Thin Films Produced by High-Power Impulse Magnetron Sputtering. MICROMACHINES, v. 10, n. 3 MAR 22 2019. Web of Science Citations: 0.
DIAS, VANESSA; MACIEL, HOMERO; FRAGA, MARIANA; LOBO, ANDERSON O.; PESSOA, RODRIGO; MARCIANO, FERNANDA R. Atomic Layer Deposited TiO2 and Al2O3 Thin Films as Coatings for Aluminum Food Packaging Application. MATERIALS, v. 12, n. 4 FEB 2 2019. Web of Science Citations: 1.
TONELI, D. A.; PESSOA, R. S.; ROBERTO, M.; GUDMUNDSSON, J. T. A global model study of low pressure high density CF4 discharge. PLASMA SOURCES SCIENCE & TECHNOLOGY, v. 28, n. 2 FEB 2019. Web of Science Citations: 1.
GALVAO, NIERLLY; VASCONCELOS, GETULIO; PESSOA, RODRIGO; MACHADO, JOAO; GUERINO, MARCIEL; FRAGA, MARIANA; RODRIGUES, BRUNO; CAMUS, JULIEN; DJOUADI, ABDOU; MACIEL, HOMERO. A Novel Method of Synthesizing Graphene for Electronic Device Applications. MATERIALS, v. 11, n. 7 JUL 2018. Web of Science Citations: 1.

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