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Microsystem Technologies

, Volume 24, Issue 9, pp 3623–3630 | Cite as

Self-assembled graphene and copper nanoparticles composite sensor for nitrate determination

  • Li Wang
  • Jungyoon Kim
  • Tianhong Cui
Technical Paper

Abstract

A new sensor based on decorated copper nanoparticles and self-assembled graphene was fabricated and exemplified with the determination of nitrate solutions. Traditionally, graphene is coated on the sensor by drop-casting, leading to poor adhesion between graphene and the sensor. The self-assembled graphene proposed in this paper not only have a firm connection with the substrate, but also provide a three-dimensional network structure for copper nanoparticles. Copper was found as an effective catalyst for nitrate reduction. The combination of copper nanoparticles and self-assembled graphene can greatly enhance the sensitivity. Thus, low detection limit of 7.89 µM is obtained for nitrate, which to our knowledge, is among the lowest reported in the literatures. This method was employed for the determination of nitrate in lake water and the results were in good agreement with those obtained from a standard analytical procedure.

Notes

Acknowledgements

One of the authors acknowledges the support from China Scholarship Council. The devices are fabricated at Minnesota Nano Center, Minneapolis, MN, USA.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision InstrumentTsinghua UniversityBeijingChina
  2. 2.Department of Mechanical EngineeringUniversity of MinnesotaMinneapolisUSA

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