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Electroless-Deposited Platinum Antennas for Wireless Surface Acoustic Wave Sensors

  • In an effort to develop a cost-efficient technology for wireless high-temperature surface acoustic wave sensors, this study presents an evaluation of a combined method that integrates physical vapor deposition with electroless deposition for the fabrication of platinum-based planar antennas. The proposed manufacturing process becomes attractive for narrow, thick, and sparse metallizations for antennas in the MHz to GHz frequency range. In detail, narrow platinum-based lines of a width down to 40 μm were electroless-deposited on γ-Al2O3 substrates using different seed layers. At first, the electrolyte chemistry was optimized to obtain the highest deposition rate. Films with various thickness were prepared and the electrical resistivity, microstructure, and chemical composition in the as-prepared state and after annealing at temperatures up to 1100 ∘C were evaluated. Using these material parameters, the antenna was simulated with an electromagnetic full-wave simulation tool and then fabricated. The electrical parameters, including theIn an effort to develop a cost-efficient technology for wireless high-temperature surface acoustic wave sensors, this study presents an evaluation of a combined method that integrates physical vapor deposition with electroless deposition for the fabrication of platinum-based planar antennas. The proposed manufacturing process becomes attractive for narrow, thick, and sparse metallizations for antennas in the MHz to GHz frequency range. In detail, narrow platinum-based lines of a width down to 40 μm were electroless-deposited on γ-Al2O3 substrates using different seed layers. At first, the electrolyte chemistry was optimized to obtain the highest deposition rate. Films with various thickness were prepared and the electrical resistivity, microstructure, and chemical composition in the as-prepared state and after annealing at temperatures up to 1100 ∘C were evaluated. Using these material parameters, the antenna was simulated with an electromagnetic full-wave simulation tool and then fabricated. The electrical parameters, including the S-parameters of the antenna, were measured. The agreement between the simulated and the realized antenna is then discussed.show moreshow less

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Metadaten
Author: Erik BrachmannORCiD, Marietta SeifertORCiD, Niels NeumannORCiD, Nidal Alshwawreh, Margitta Uhlemann, Siegfried Menzel, Jörg AckerORCiDGND, Steven HeroldORCiD, Volker Hoffmann, Thomas GemmingORCiD
URL:https://www.mdpi.com/1996-1944/12/7/1002
DOI:https://doi.org/10.3390/ma12071002
ISSN:1996-1944
Title of the source (English):Materials
Document Type:Scientific journal article peer-reviewed
Language:English
Year of publication:2019
Tag:antenna; electroless deposition; high-temperature; platinum film; wireless SAW sensor
Volume/Year:12
Issue number:7
First Page:1002
Last Page:1014
Faculty/Chair:Fakultät 2 Umwelt und Naturwissenschaften / FG Physikalische Chemie
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