Electrophoretic-deposited HAP nano-layer as a QCM-D sensor coating: effects of suspension concentration and electric-field strength

Liang Zheng; Wei Gong; Yue Tang; Genlei Ma; Jing Zheng; Shi-zhe Chen; Wei-hua Li

Electrophoretic-deposited HAP nano-layer as a QCM-D sensor coating: effects of suspension concentration and electric-field strength

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Author(s): Liang Zheng^{1, 2, 3} ; Wei Gong² ; Yue Tang² ; Genlei Ma² ; Jing Zheng² ; Shi-zhe Chen¹ ; Wei-hua Li³
- Affiliations: 1: Shandong Provincial Key Laboratory of Marine Monitoring Instrument and Equipment Technology , Institute of Oceanographic Instrumentation, Qilu University of Technology (Shandong Academy of Sciences) , Qingdao , People's Republic of China ;
  2: Key Laboratory of Advanced Technologies of Materials , Tribology Research Institute, Ministry of Education, Southwest Jiaotong University , Chengdu 610031 , People's Republic of China ;
  3: Key Laboratory of Marine Environmental Corrosion and Bio-fouling , Institute of Oceanology, Chinese Academy of Sciences , Qingdao 266071 , People's Republic of China
Source: Volume 4, Issue 3, September 2018, p. 79 – 84
DOI: 10.1049/bsbt.2018.0020 , Online ISSN 2405-4518

This is an open access article published by the IET and Southwest Jiaotong University under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/)

Received 09/07/2018, Accepted 02/08/2018, Revised 01/08/2018, Published 06/08/2018

This study investigates the fabrication of hydroxyapatite (HAP) nano-coating on a gold–quartz crystal sensor used for quartz crystal microbalance with dissipation (QCM-D) measurement using an electrophoretic deposition technique. Surface morphology and thickness of the HAP coating are examined via scanning electron microscopy and nano-indention testing. Its repeatability is verified via QCM-D testing. Results show that electrophoretic deposition with ultrasonic treatment is feasible and cost-effective for fabricating nano-thick HAP coatings on a QCM-D gold–quartz crystal sensor surface. Both suspension concentration and electric-field strength influence the compactness of HAP coatings. There exists a non-linear relationship between HAP coating compactness and the suspension concentration/electric-field strength. When the HAP suspension concentration is 30 g/l and the applied electric-field strength is 150 V/cm, the HAP coating on the QCM-D gold–quartz crystal sensor surface is uniform and compact with a thickness of 35 nm and is tightly bonded to the sensor surface. The obtained HAP-coated sensor is thus suitable for QCM-D measurement.

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Electrophoretic-deposited HAP nano-layer as a QCM-D sensor coating: effects of suspension concentration and electric-field strength

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