Journal of Sensor Science and Technology (센서학회지)

The Korean Sensors Society (한국센서학회)
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Quantitative Analysis of SO2 and NO2 Adsorption and Desorption on Quartz Crystal Microbalance Coated with Cobalt Gallate Metal-Organic Framework

  • Junhyuck Ahn (Department of Advanced Science and Technology Convergence, Kyungpook National University (KNU)) ;
  • Taewook Kim (Department of Advanced Science and Technology Convergence, Kyungpook National University (KNU)) ;
  • Sunghwan Park (Department of Advanced Science and Technology Convergence, Kyungpook National University (KNU)) ;
  • Young-Sei Lee (Department of Advanced Science and Technology Convergence, Kyungpook National University (KNU)) ;
  • Changyong Yim (Department of Advanced Science and Technology Convergence, Kyungpook National University (KNU))
  • Received : 2023.05.03
  • Accepted : 2023.05.22
  • Published : 2023.05.31
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Abstract

Metal-organic frameworks (MOFs) of cobalt gallate were synthesized and deposited on gold electrodes using self-assembly monolayers (SAMs) and hydrothermal processing. These MOF films exhibit strong adsorption capabilities for gaseous particulates, and the use of SAMs allows the synthesis and deposition processes to be completed in a single step. When cobalt gallate is mixed with SAMs, a coordination bond is formed between the cobalt ion and the carboxylate or hydroxyl groups of the SAMs, particularly under hydrothermal conditions. Additionally, the quartz crystal microbalance (QCM) gas sensor accurately measures the number of particulates adsorbed on the MOF films in real-time. Thus, the QCM gas sensor is a valuable tool for quantitatively measuring gases, such as SO2, NO2, and CO2. Furthermore, the QCM MOF film gas sensor was more effective for gas adsorption than the MOF particles alone and allowed the accurate modeling of gas adsorption. Moreover, the QCM MOF films accurately detect the adsorption-desorption mechanisms of SO2 and NO2, which exist as gaseous particulate matter, at specific gas concentrations.

Keywords

Acknowledgement

This study was supported by the National Research Foundation of Korea (NRF) grant funded by the Korean Government (MSIT) (No. NRF-2021R1A5A8033165).

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