Measurements of synthesized graphene oxides electrophoresed deposition for ultrasensitive humidity detection

Different synthesized GO materials were electrophoresed deposition on QCM for humidity detection. Impedance incorporated with oscillation frequency measurements were done for precise analysis and comparison in different humidity environments. [Display omitted] •GO synthesis methods including reducta...

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Bibliographic Details
Published in:Materials science & engineering. B, Solid-state materials for advanced technology Solid-state materials for advanced technology, 2019-04, Vol.243, p.149-157
Main Authors: Hsieh, Cheng Pu, Ho, Ching-Yuan, Huang, Shih-Ming, Yang, T.I., Chang, Yaw-Jen
Format: Article
Language:English
Subjects:
Desorption
Electron diffraction
Electrophoresis
Field emission
Fourier transforms
Functional groups
Graphene
Graphene oxide
Humidity
Infrared spectra
Langmuir model
Microbalances
Morphology
Parameter sensitivity
Quartz crystal microbalance
Quartz crystals
Related humidity
Resonant frequencies
Sensitivity
Synthesis
Temperature control
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Summary:Different synthesized GO materials were electrophoresed deposition on QCM for humidity detection. Impedance incorporated with oscillation frequency measurements were done for precise analysis and comparison in different humidity environments. [Display omitted] •GO synthesis methods including reductants, temperature controls are evaluated.•Electrophoretic deposition of GO were coated on QCM for humidity sensor study.•Humidity sensor was analyzed by both electrical and frequency methods.•Kinetic parameters for adsorption/desorption were extracted by Langmuir mode.•Na2NO3 reductant, temperature control and 3 V electrophoresis are the best for sensor. Two types of synthesized graphene oxide (GO) were electrophoresed using various reductants and temperature controls on the Au electrode of a quartz crystal microbalance (QCM) device for humidity detection. Characteristics of the synthesized GO, its surface morphology, and its functional groups were investigated by SEM images based on EDS and Fourier transform infrared spectra (FTIR). Structure and lattice were clear resolved using 80 kV field emission gun TEM (FEG-TEM) and electron diffraction (SAED), respectively. The resonant frequency and impedance were complementary utility to illustrate the sensitivity of various GO loaded QCM sensors. The kinetic parameters of the adsorption-desorption at a related humidity of 23–95% were extracted using the Langmuir isotherm model. In this experiment, the GOTC synthesized by a strong reductant NaNO3 and temperature control was demonstrated to exhibit excellent humidity sensing sensitivity with a fast absorption-desorption rate, making it a potential candidate for moisture detection.
ISSN:0921-5107
1873-4944
DOI:10.1016/j.mseb.2019.04.012