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Electrochemical characterization of reduced graphene oxide as an ion-to-electron transducer and application of screen-printed all-solid-state potassium ion sensors

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Abstract

We report potentiometric performances of ion-to-electron transducer based on reduced graphene oxide (RGO) for application of all-solid-state potassium ion sensors. A large surface area and pore structure of RGO are obtained by a hydrothermal self-assembly of graphene oxide. The extensive electrochemical characterization of RGO solid contact at the interface of ion-selective membrane and gold electrode shows that the potassium ion-selective electrode based on RGO had a high sensitivity (53.34 mV/log[K+]), a low detection of limit (− 4.24 log[K+], 0.06 mM) a good potential stability, and a high resistance to light and gas interferences. The potentiometric K+-sensor device was fabricated by combining of screen-printed electrodes and a printed circuit board. The K+-sensor device accurately measures the ion concentration of real samples of commercial sports drinks, coke and orange juice, and then transfers the collected data to a mobile application through a Bluetooth module. The screen-printed ion sensors based on RGO solid contact show a great potential for real-time monitoring and point-of-care devices in human health care, water-treatment process, and environmental and chemical industries.

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Acknowledgements

This research was supported by the Bio & Medical Technology Development Program of the National Research Foundation (NRF) and funded by the Korean government (MSIP) (Nos. 2015M3A9D7067457, 2018R1C1B3001553).

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  1. Jo Hee Yoon and Hong Jun Park have contributed equally to this work.

Authors and Affiliations

  1. Department of Chemical Engineering, Kangwon National University, 346 Joongang-ro, Samcheok, Gangwon-do, 25913, Republic of Korea

    Jo Hee Yoon, Hong Jun Park, Seung Hwa Park & Bong Gill Choi

  2. Nano-bio Application Team, National Nanofab Center, 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea

    Kyoung G. Lee

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  1. Jo Hee Yoon
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  2. Hong Jun Park
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Correspondence to Kyoung G. Lee or Bong Gill Choi.

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Yoon, J.H., Park, H.J., Park, S.H. et al. Electrochemical characterization of reduced graphene oxide as an ion-to-electron transducer and application of screen-printed all-solid-state potassium ion sensors. Carbon Lett. 30, 73–80 (2020). https://doi.org/10.1007/s42823-019-00072-6

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