Research on Structure and Sorption Properties of Affiliative Polymer Piezoelectric Sensor Film Coating

Gu, Yu; Li, Qiang; Tian, Fengzhan; Xu, Bao-Jun

doi:10.1007/978-3-319-04573-3_16

Cited by 4 publications

(4 citation statements)

References 7 publications

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“…The diameter of the sensor is d = 8 mm and the sensor's thickness is δ = 0.170 mm. As transducers, they incorporate two polymer detection layers and transform an interaction, compatible reaction between the polymer layer with the volatile gas of Chinese liquors, into a testing frequency signal based on the Quartz Crystal Microbalance (QCM) principle [28]. …”

Section: Methodsmentioning

confidence: 99%

A 3D CFD Simulation and Analysis of Flow-Induced Forces on Polymer Piezoelectric Sensors in a Chinese Liquors Identification E-Nose

Wang

et al. 2016

Sensors

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Chinese liquors can be classified according to their flavor types. Accurate identification of Chinese liquor flavors is not always possible through professional sommeliers’ subjective assessment. A novel polymer piezoelectric sensor electric nose (e-nose) can be applied to distinguish Chinese liquors because of its excellent ability in imitating human senses by using sensor arrays and pattern recognition systems. The sensor, based on the quartz crystal microbalance (QCM) principle is comprised of a quartz piezoelectric crystal plate sandwiched between two specific gas-sensitive polymer coatings. Chinese liquors are identified by obtaining the resonance frequency value changes of each sensor using the e-nose. However, the QCM principle failed to completely account for a particular phenomenon: we found that the resonance frequency values fluctuated in the stable state. For better understanding the phenomenon, a 3D Computational Fluid Dynamics (CFD) simulation using the finite volume method is employed to study the influence of the flow-induced forces to the resonance frequency fluctuation of each sensor in the sensor box. A dedicated procedure was developed for modeling the flow of volatile gas from Chinese liquors in a realistic scenario to give reasonably good results with fair accuracy. The flow-induced forces on the sensors are displayed from the perspective of their spatial-temporal and probability density distributions. To evaluate the influence of the fluctuation of the flow-induced forces on each sensor and ensure the serviceability of the e-nose, the standard deviation of resonance frequency value (SDF) and the standard deviation of resultant forces (SDFy) in y-direction (Fy) are compared. Results show that the fluctuations of Fy are bound up with the resonance frequency values fluctuations. To ensure that the sensor's resonance frequency values are steady and only fluctuate slightly, in order to improve the identification accuracy of Chinese liquors using the e-nose, the sensors in the sensor box should be in the proper place, i.e., where the fluctuations of the flow-induced forces is relatively small. This plays a significant reference role in determining the optimum design of the e-nose for accurately identifying Chinese liquors.

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Section: Methodsmentioning

confidence: 99%

A 3D CFD Simulation and Analysis of Flow-Induced Forces on Polymer Piezoelectric Sensors in a Chinese Liquors Identification E-Nose

Wang

et al. 2016

Sensors

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“…where K = Nρ p S q , ρ p is the density of the polymer (ρ p = 2.22 g/cm 3 for PTFE polymer ultrafine powder), S q is the area of the deposited polymer on the quartz crystal (cm 2 ), and ∆d is the polymer coating's thickness (10 −4 cm). Equation ( 2) indicates a linear relationship between the frequency change and the change of the polymer coating's thickness.…”

Section: From the Sauerbrey Equation (1) We Can Obtainmentioning

confidence: 99%

“…Polymer coating has high sensitivity for testing microconstituents in Chinese spirits. [3] Due to the polymer materials' diversity and stability, they have become important starting materials for coating preparation. The polymer material can adhere to the surface of the quartz crystal basis.…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of PTFE coating in new polymer quartz piezoelectric crystal sensor for testing liquor products

Gu¹,

Li²

2015

Chinese Phys. B

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A new method was developed based on the electron beam vacuum dispersion (EBVD) technology to prepare the PTFE polymer coating of the new polymer quartz piezoelectric crystal sensor for testing liquor products. The new method was applied in the new EBVD equipment which we designed. A real-time system monitoring the polymer coating’s thickness was designed for the new EBVD equipment according to the quartz crystal microbalance (QCM) principle, playing an important role in preparing stable and uniform PTFE polymer coatings of the same thickness. 30 pieces of PTFE polymer coatings on the surface of the quartz crystal basis were prepared with the PTFE polymer ultrafine powder (purity ≥ 99.99%) as the starting material. We obtained 30 pieces of new PTFE polymer sensors. By using scanning electron microscopy (SEM), the structure of the PTFE polymer coating’s column clusters was studied. One sample from the 30 pieces of new PTFE polymer sensors was analysed by SEM in four scales, i.e., 400×, 1000×, 10000×, and 25000×. It was shown that under the condition of high bias voltage and low bias current, uniformly PTFE polymer coating could be achieved, which indicates that the new EBVD equipment is suitable for mass production of stable and uniform polymer coating.

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“…Whereas, films with uniform thick ness cannot be obtained with this method. Vacuum electron beam dispersion (EBD) coating technology [23] is a good way to gain nanocomposite organic film with controllable uniform thickness, except for additional complexity of devices and material restriction. Therefore, a simple coating method is greatly in need to obtain films with relative uniform thick ness.…”

Section: Introductionmentioning

confidence: 99%

A humidity sensor based on AlN Lamb wave resonator coated with graphene oxide of different concentrations

Pang

et al. 2018

J. Micromech. Microeng.

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A high-performance humidity sensor based on an AlN (aluminum nitride) Lamb wave resonator coated with graphene oxide (GO) is presented in this paper. With the porous structure and oxygen-containing groups of GO as the sensing layer, the humidity sensor exhibits a high sensitivity of 26 kHz/%RH at 10%–90% relative humidity. However, more than half of the frequency variation occurs in the range of 70%RH to 90%RH. In this paper, we propose a vacuum film-coating method to improve the performance of the GO film. With this GO film, the sensitivity is increased by 160% in the humidity range between 10% to 60%RH compared to conventional ones. The sensor also demonstrates a low temperature coefficient of frequency, small hysteresis, and short response (~9 s)/recovery (~11 s) time. Therefore, the humidity sensor with GO shows great potential in practical applications.

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Research on Structure and Sorption Properties of Affiliative Polymer Piezoelectric Sensor Film Coating

Cited by 4 publications

References 7 publications

A 3D CFD Simulation and Analysis of Flow-Induced Forces on Polymer Piezoelectric Sensors in a Chinese Liquors Identification E-Nose

A 3D CFD Simulation and Analysis of Flow-Induced Forces on Polymer Piezoelectric Sensors in a Chinese Liquors Identification E-Nose

Preparation and characterization of PTFE coating in new polymer quartz piezoelectric crystal sensor for testing liquor products

A humidity sensor based on AlN Lamb wave resonator coated with graphene oxide of different concentrations

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