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. 2019 Oct 11;19(20):4395. doi: 10.3390/s19204395

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

PMC Copyright notice

(A) Image of 195 MHz HFF-QCM from KVG Quartz Crystal Technology GmbH, (Neckarbischofsheim, Germany). The quartz crystal has diameter of approximately 5 mm, adapted from [93]. (B) A 150 MHz HFF-QCM manufactured by Advanced Wave Sensors (AWS) S. L. (Paterna, Spain). The device is integrated in a customized printed circuit board (PCB) to improve handling, PCB has dimension of 17.5 × 14 mm² with thickness 1.55 mm, adapted from [94].