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Printed flexible bifunctional electrochemical urea-pH sensor based on multiwalled carbon nanotube/polyaniline electronic ink

  • Qiwen Bao
  • Zhengchun Yang
  • Yanfei Song
  • Meiying Fan
  • Peng PanEmail author
  • Jun LiuEmail author
  • Zhenyu LiaoEmail author
  • Jun Wei
Article
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Abstract

Urea concentration and pH are two crucial parameters in food and clinical analysis. Traditional analytical methods of urea and pH determination are unsuitable for field and involve complex instrumentation or and enzyme-based assays. In this study, we used screen printing technology to prepare an electrochemical sensor with a carbon electrode modified by a multiwalled carbon nanotube/polyaniline (MWCNT/PANi) composite for the simultaneous detection of urea and pH. Urea was detected by a simple current–potential (IV) experiment and its concentration level on the MWCNT/PANi-modified screen-printed carbon electrode (SPCE) surface was determined by cyclic voltammetry. The MWCNT/PANi-modified SPCE had a linear response (R2 = 0.99902), lower detection limit, higher selectivity, and higher sensitivity than reported biosensors. Specifically, the detection limit was 10 µM and the sensitivity was 0.38 mA mM−1 cm−2 in the urea concentration range of 10–50 µM. Chronoamperometry was applied to investigate the changes in voltage on the MWCNT/PANi-modified SPCE with varying solution pH. The sensor exhibited excellent linearity (R2 = 0.99089) and an average sensitivity of 20.63 mV/pH over a wide pH range of 2–11. Thus, the MWCNT/PANi-modified SPCE has a promising field application as a simple, bifunctional non-enzymatic sensor.

Notes

Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant No. 51502203), the Tianjin Young Overseas High-level Talent Plans (Grant No. 01001502), the Tianjin Science and Technology Foundation (Grant No. 17ZXZNGX00090) and Tianjin Development Program for Innovation and Entrepreneurship.

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.School of Electrical and Electronic Engineering, Tianjin Key Laboratory of Film Electronic & Communication Devices, Advanced Materials and Printed Electronics CenterTianjin University of TechnologyTianjinChina
  2. 2.Pony Testing International GroupTianjinChina
  3. 3.Tianjin Food Safety Inspection Technology InstituteTianjinChina
  4. 4.Singapore Institute of Manufacturing Technology, Agency for Science, Technology and Research (A*STAR)SingaporeSingapore

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