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Dual-Channel Quartz-Crystal Microbalance for Sensing Under UV Radiation

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2 Author(s)
Abe, Takashi ; Dept. of Bioeng. & Robotics, Tohoku Univ., Sendai ; Xinghua Li

In situ measurements of interfacial phenomena with subatomic resolution under environmental disturbances have been a major goal of engineers and scientists engaged in the development of a microbalance sensor. Here, we demonstrate in situ measurements of the photooxidization process of alkanethiol self-assembled monolayers using dual-channel quartz-crystal microbalance (D-QCM) sensor that uses spherically contoured resonators to acoustically separate sensing channels for simultaneous compensation of environmental disturbances. Using a photolithographic method to make the D-QCM, the reference channel used in parallel with the sensing channel has almost the same resonant frequency and temperature coefficient of frequency. As a result, mass changes of 10-pg order accuracy were observed under ultraviolet radiation over four days

Published in:

Sensors Journal, IEEE  (Volume:7 ,  Issue: 3 )