Next Article in Journal
Characterization of Single-Nucleus Electrical Properties by Microfluidic Constriction Channel
Next Article in Special Issue
A Novel Capacitance-Based In-Situ Pressure Sensor for Wearable Compression Garments
Previous Article in Journal
Mechanical Property Changes in Breast Cancer Cells Induced by Stimulation with Macrophage Secretions in Vitro
Previous Article in Special Issue
Oscillating U-Shaped Body for Underwater Piezoelectric Energy Harvester Power Optimization
Open AccessArticle

Reliability of Protective Coatings for Flexible Piezoelectric Transducers in Aqueous Environments

1
Istituto Italiano di Tecnologia, Center for Biomolecular Nanotechnologies, 73010 Arnesano (Lecce), Italy
2
Dipartimento di Ingegneria dell’Innovazione, Università del Salento, 73100 Lecce, Italy
3
Piezoskin s.r.l., 73010 Arnesano (Lecce), Italy
*
Author to whom correspondence should be addressed.
Present address: CNR NANOTEC, Institute of Nanotechnology, Via Monteroni, 73100 Lecce, Italy.
Micromachines 2019, 10(11), 739; https://doi.org/10.3390/mi10110739
Received: 11 October 2019 / Revised: 24 October 2019 / Accepted: 29 October 2019 / Published: 31 October 2019
(This article belongs to the Special Issue Piezoelectric Transducers: Materials, Devices and Applications)
Electronic devices used for marine applications suffer from several issues that can compromise their performance. In particular, water absorption and permeation can lead to the corrosion of metal parts or short-circuits. The added mass due to the absorbed water affects the inertia and durability of the devices, especially for flexible and very thin micro-systems. Furthermore, the employment of such delicate devices underwater is unavoidably subjected to the adhesion of microorganisms and formation of biofilms that limit their reliability. Thus, the demand of waterproofing solutions has increased in recent years, focusing on more conformal, flexible and insulating coatings. This work introduces an evaluation of different polymeric coatings (parylene-C, poly-dimethyl siloxane (PDMS), poly-methyl methacrylate (PMMA), and poly-(vinylidene fluoride) (PVDF)) aimed at increasing the reliability of piezoelectric flexible microdevices used for sensing water motions or for scavenging wave energy. Absorption and corrosion tests showed that Parylene-C, while susceptible to micro-cracking during prolonged oscillating cycles, exhibits the best anti-corrosive behavior. Parylene-C was then treated with oxygen plasma and UV/ozone for modifying the surface morphology in order to evaluate the biofilm formation with different surface conditions. A preliminary characterization through a laser Doppler vibrometer allowed us to detect a reduction in the biofilm mass surface density after 35 days of exposure to seawater. View Full-Text
Keywords: waterproof; coating; reliability; flexible micro-devices; piezoelectric transducers; aqueous environments; seawater waterproof; coating; reliability; flexible micro-devices; piezoelectric transducers; aqueous environments; seawater
Show Figures

Figure 1

MDPI and ACS Style

Mariello, M.; Guido, F.; Mastronardi, V.M.; Giannuzzi, R.; Algieri, L.; Qualteri, A.; Maffezzoli, A.; De Vittorio, M. Reliability of Protective Coatings for Flexible Piezoelectric Transducers in Aqueous Environments. Micromachines 2019, 10, 739.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop