A Novel Chemical Sensor Using CH/sub3/Si(OCH/sub3/)Sol-gel Thin Film Coated Quartz-resonator Microbalance

Nanto, Hidehito; Tsubakino, Shiro; Habara, Masaaki; Kondo, Ken‐ichi; Morita, Takashi; Douguchi, Yoshiteru; Nakazumi, Hiroyuki; Waite, Ruth I.

doi:10.1109/sensor.1995.721945

Cited by 1 publication

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“…Quartz crystal microbalance (QCM) is best suitable for this requisite since it is highly sensitive to mass changes [4][5][6]. QCM has been widely used as a mass sensor by measuring the shift in resonance frequency due to mass loading [4][5][6][7][8][9]. The change in mass (Δ ) of the QCM can be estimated by measuring the shift in the resonance frequency (Δ ) and is given by Sauerbrey equation [9,10]:…”

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confidence: 99%

Humidity Detection Using Metal Organic Framework Coated on QCM

et al. 2016

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Quartz crystal microbalance (QCM) coated with poly-4-vinylpyridine (PVP) and metal organic framework HKUST-1 are investigated and compared for humidity sensing. Drop casting method is employed to coat the PVP and HKUST-1 solutions onto the surface of a quartz crystal microbalance. The resonance frequencies of these sensors with varying relative humidity (RH) from 22% RH to 69% RH are measured using impedance analysis method. The sensitivity, humidity hysteresis, response, and recovery times of these sensors are studied. The sensitivities of uncoated, PVP, and HKUST-1 coated QCM sensors are 7 Hz, 48 Hz, and 720 Hz, respectively, in the range of 22% RH-69% RH. The extraction of desorption rate and adsorption energy associated with the adsorption and desorption of water molecules on these surfaces reveals that HKUST-1 has better sensing properties than PVP and uncoated QCM sensors. In this work, the HKUST-1 coated QCM is shown to be a promising material for moisture detection.

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