Atomic Layer Deposited TiO2 and Al2O3 Thin Films as Coatings for Aluminum Food Packaging Application

Abstract

Titanium dioxide (TiO2) and aluminum oxide (Al2O3) coatings have been investigated in a wide range of bio-applications due to their biodegradation and biocompatibility properties, that are key parameters for their use in the food packaging and biomedical devices fields. The present study evaluates and compares the electrochemical behavior of the non-coated, commercial resin-coated, TiO2-coated and Al2O3-coated aluminum in commercial beer electrolyte. For this, TiO2 and Al2O3 thin films were deposited on aluminum (Al) substrates using atomic layer deposition (ALD). The evaluation of the corrosion barrier layer properties was performed by linear sweep voltammetry (LSV) during 10 min and electrochemical impedance spectroscopy (EIS). In addition, profilometry, grazing incidence X-ray diffractometry (GIXRD), scanning electron microscopy (SEM) and Fourier-transform infrared spectroscopy (FT-IR) analyses were performed to investigate the physical and chemical properties of the pristine and / or corroded samples. TiO2 and Al2O3 films presented an amorphous structure, a morphology that follows Al substrate surface, and a thickness of around 100 nm. Analysis of LSV data showed that ALD coatings promoted a considerable increase in corrosion barrier efficiency being 86.3% for TiO2-coated Al and 80% for Al2O3-coated Al in comparison with 7.1% of commercial resin-coated Al. This is mainly due to the lower electrochemical porosity, 11.4% for TiO2-coated Al and 20.4% for Al2O3-coated Al in comparison with 96% of the resin-coated Al, i.e. an increase of up to twofold in the protection of Al when coated with TiO2 compared to Al2O3. The EIS results allow us to complement the discussions about the reduced corrosion barrier efficiency of the Al2O3 film for beer electrolyte once SEM and FT-IR analyzes did not show drastic changes in both investigated ALD films after the corrosion assays. The above results indicate that ALD TiO2 and Al2O3 films may be a viable alternative to replace the synthetic resin coatings frequently used in aluminum cans of use in the food industry.

Facile Synthesis of Potassium-Doped Titanium Oxide Nanostructure (KTiOxs)/AlO(OH) Composites for Enhanced Photocatalytic Performance

“…The strong band at 3000-3400 cm −1 and the weak band at 1600-1700 cm −1 can be assigned to the stretching and bending modes of the adsorbed water [48]. Other absorption peaks were observed at around 480-500 cm −1 after the steam coating process, which could be attributed to Al-O symmetric stretching and ring vibration mode in Al-O tetraheda formed through the oxygen atom [49]. In particular, the KTiO x s/AlO(OH) composite reveled the stretching vibration mode of Ti-O (580 cm −1 ) and Ti-O-Ti (720 cm −1 ) with Al-O bonding [50].…”

“…Catalysts 2021, 11, x FOR PEER REVIEW 9 of 15 the steam coating process, which could be attributed to Al-O symmetric stretching and ring vibration mode in Al-O tetraheda formed through the oxygen atom [49]. In particular, the KTiOxs/AlO(OH) composite reveled the stretching vibration mode of Ti-O (580 cm −1 ) and Ti-O-Ti (720 cm −1 ) with Al-O bonding [50].…”

A highly efficient surface modified separator fabricated with atmospheric atomic layer deposition for high temperature lithium ion batteries

“…The diffusion of lithium ions in LIB cell is done in active electrode material which shows inclined line in the region where low frequency is applied, whereas, in the middle of frequency range, semi‐circle is formed. This represents the charge transfer resistance as in parallel to lithium ions movement between the electrodes using the interface of electrolyte 34 . The ionic conductivity of cell is attributed to the Ohmic resistance as depicted in the EIS profile in the form of x‐intercepts which are formed in high frequency region.…”

MOS Capacitance Measurements for PEALD TiO2 Dielectric Films Grown under Different Conditions and the Impact of Al2O3 Partial-Monolayer Insertion

“…Titanium dioxide (TiO 2 ) thin films and nanolaminates have a significant number of promising applications in different areas, such as microelectronics [1][2][3][4][5][6], photovoltaics [7,8], photocatalysis [9][10][11] fuel cells [12], sensors [13][14][15][16], anti-reflective coating applications [17], biomedical coatings [18,19] and food packaging applications [20]. The properties and applicability of TiO 2 thin films are intrinsically related to their crystal structure.…”