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Inkjet-printed paper-based sensor array for highly accurate pH sensing.

Yanqi Li1, Yu Wang2, Shuqin Chen1

  • 1Department of Instrumentation and Analytical Chemistry, CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, PR China; University of Chinese Academy of Sciences, Beijing, 100049, PR China.

Analytica Chimica Acta
|March 19, 2021
PubMed
Summary
This summary is machine-generated.

A new inkjet-printed paper sensor array uses polyethylene glycol (PEG) to detect pH across a wide range (1.00-13.60) with high resolution. This novel colorimetric sensor offers accurate pH measurements for aqueous samples.

Keywords:
Indicating range extensionIndicator immobilizationInkjet-printingPaper-based sensor arraypH sensing

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Area of Science:

  • Analytical Chemistry
  • Materials Science

Background:

  • Accurate pH monitoring is crucial in various scientific and industrial applications.
  • Existing pH sensing methods can be complex or limited in scope.
  • Development of simple, portable, and high-resolution pH sensors is needed.

Purpose of the Study:

  • To develop a novel paper-based colorimetric sensor array for high-resolution pH detection.
  • To utilize inkjet printing and a polyethylene glycol (PEG) immobilization system for sensor fabrication.
  • To evaluate the sensor array's performance across a broad pH range and in real aqueous samples.

Main Methods:

  • Fabrication of a 3x3 sensor array on mixed cellulose ester (MCE) paper using inkjet printing.
  • Immobilization of eight pH indicators with polyethylene glycol (PEG-400) in mixed inks.
  • Colorimetric analysis of aqueous samples across a wide pH range.

Main Results:

  • The sensor array successfully detected pH in the range of 1.00-13.60 with a resolution of 0.20 pH units.
  • Polyethylene glycol (PEG-400) facilitated homogeneous indicator immobilization and extended indicator ranges.
  • The sensor array demonstrated excellent discrimination ability for both standard buffers and real aqueous samples.

Conclusions:

  • The developed paper-based sensor array offers a robust and high-resolution method for pH detection.
  • Inkjet printing combined with PEG immobilization provides an effective platform for creating advanced colorimetric sensors.
  • This technology has potential applications in environmental monitoring, chemical analysis, and point-of-care diagnostics.