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DGIST developed a new material for electrochemical sensing of carbon dioxide

  • 조회. 1454
  • 등록일. 2014.06.13
  • 작성자. Administrator

DGIST developed a new material for electrochemical sensing of carbon dioxide

- Expected to replace the commercial sensors -  

On May 30, DGIST announced that Prof. Nak Cheon Jeong’s research team (Department of Emerging Materials Science) developed a new material that enables to precisely detect the carbon dioxide content in atmosphere.

Through this work, Jeong and colleagues discovered the reversibility of the new material, called metal-organic framework (MOF)*, on its adsorption and desorption of atmospheric carbon dioxide. This work has been achieved by collaboration with a research group led by Prof. Stoddart in Chemistry, Northwestern University.

(*Metal-organic frameworks (MOFs) are an intriguing class of crystalline nanoporous materials that can readily assembled by combining metal ions and multitopic organic ligands.)

The MOF material, comprised of rubidium cations and γ-cyclodextrin, has also shown selectivity for Co₂ on its adsorption behavior. The selectivity could allow the material to detect carbon dioxide at room temperature.

The detection of carbon dioxide could be, in principle, accomplished by monitoring the changes of ionic conductance in the MOF material. For instance, the conductance quasi-exponentially decreases as the quantity of adsorbed carbon dioxide increases.

In contrast to this MOF material, the established sensing technologies, which based on semiconducting materials, has shown limits on the selectivity for Co₂ at room temperature, e.g. in the admixture of Co₂, O₂, and H₂O. Thus, in the traditional technologies, equipping a component for maintaining sensors at high temperature, and thereby, desorb the contaminants from sensor materials, has been necessarily required. This sort of additional equipments have let the sensor devices cumbersome and expensive.

As a potential alternative to replace the traditional, commercialized sensors, the MOF sensor would be expected to show low-temperature operation, high selectivity for Co₂, and economic feasibility, if it could be successful to fabricate in submicron-thick film types.

Professor Jeong said, “Through this work, we have achieved developing a new type of sensor and revealed a sensing mechanism in this material.” He also said, “We hope this work would be a trigger to open a new academic field in the MOF materials area.”

This work is published by JACS (Journal of the American Chemical Society) at June 11, 2014.

Meanwhile, this work has been conducted with the supports from the R&D program sponsored by DGIST and the Basic Science Research Program for Young Faculties sponsored by NRF.