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Sensors 2017, 17(5), 1136; doi:10.3390/s17051136

Development of a Flow Injection Based High Frequency Dual Channel Quartz Crystal Microbalance

1
Key Laboratory of Micro-Inertial Instrument and Advanced Navigation Technology, Ministry of Education, School of Instrument Science and Engineering, Southeast University, Nanjing 210096, China
2
Research Center of the Graduate school of IPS, Waseda University, Kitakyushu 808-0135, Japan
*
Author to whom correspondence should be addressed.
Academic Editor: Vittorio M. N. Passaro
Received: 15 March 2017 / Revised: 4 May 2017 / Accepted: 10 May 2017 / Published: 16 May 2017
View Full-Text   |   Download PDF [2317 KB, uploaded 16 May 2017]   |  

Abstract

When the quartz crystal microbalance (QCM) is used in liquid for adsorption or desorption monitoring based bio- or chemical sensing applications, the frequency shift is not only determined by the surface mass change, but also by the change of liquid characteristics, such as density and viscosity, which are greatly affected by the liquid environmental temperature. A monolithic dual-channel QCM is designed and fabricated by arranging two QCM resonators on one single chip for cancelling the fluctuation induced by environmental factors. In actual applications, one QCM works as a specific sensor by modifying with functional membranes and the other acts as a reference, only measuring the liquid property. The dual-channel QCM is designed with an inverted-mesa structure, aiming to realize a high frequency miniaturized chip and suppress the frequency interference between the neighbored QCM resonators. The key problem of dual-channel QCMs is the interference between two channels, which is influenced by the distance of adjacent resonators. The diameter of the reference electrode has been designed into several values in order to find the optimal parameter. Experimental results demonstrated that the two QCMs could vibrate individually and the output frequency stability and drift can be greatly improved with the aid of the reference QCM. View Full-Text
Keywords: dual-channel; QCM; high frequency; frequency interference; reference; flow cell dual-channel; QCM; high frequency; frequency interference; reference; flow cell
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Liang, J.; Zhang, J.; Zhou, W.; Ueda, T. Development of a Flow Injection Based High Frequency Dual Channel Quartz Crystal Microbalance. Sensors 2017, 17, 1136.

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