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Citation: LIAO Yu-Zhi, SI Shi-Hui, CHEN Jin-Hua, LU Yang, DU Ming. Portable Quartz Crystal Microbalance Analyzer with Adjustable Reference Frequency Source[J]. Chinese Journal of Analytical Chemistry, ;2019, 47(7): 992-997. doi: 10.19756/j.issn.0253-3820.191039 shu

Portable Quartz Crystal Microbalance Analyzer with Adjustable Reference Frequency Source

LIAO Yu-Zhi ^1, ,
SI Shi-Hui ¹ ,
CHEN Jin-Hua ^1,2 ,
LU Yang ² ,
DU Ming ²

1.
School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China;
2.
State Key Laboratory of Chemical Biosensing and Metrology, Hunan University, Changsha 410082, China

Received Date: 8 January 2019
Revised Date: 12 May 2019

Fund Project: This work was supported by the National Natural Science Foundation of China (No. 21727810).

A quartz crystal microbalance (QCM) instrument was developed on the basis of difference frequency technique. The experimental data showed that the difference frequency between the reference crystal and the detection crystal was in the range of ±10 to ±30 kHz, the accuracy was less than 0.0028% (relative error of the difference frequency data) and the precision was less than 0.2825% (the difference frequency theoretical value and measurement value error). In this work, the direct digital synthesizer (DDS) digital generator was used to generate an adjustable reference frequency source, and the difference frequency value was within the optimal range. A portable quartz crystal microbalance analyzer was based on Arduino microcomputer. The instrument had a 3.5-inch LCD screen to display the dynamic curve, and the SD card synchronously stored the data. The reference frequency could be adjusted according to the experimental conditions. The average frequency drift values of gas phase and pure water were less than 0.13 Hz/min and 0.23 Hz/min, which indicated that the instrument had good stability. The linear relationship of the instrument to different density of sodium chloride was 0.9891. The response experiment with different viscosity glycerol showed that Δf and (η_lρ_l)^1/2 had a linear relationship, which meant that the instrument had good responsiveness. At the same time, the instrument was used in combination with electrochemical workstations for on-line detection of Cu deposition process. The mass response value was 0.61 ng/Hz, which was 82.4% of the theoretical value.
- Quartz crystal microbalance,
- Direct digital synthesizer,
- Difference frequency method
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