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Efficient colorimetric pH sensor based on responsive polymer-quantum dot integrated graphene oxide.

Kwanyeol Paek1, Hyunseung Yang, Junhyuk Lee

  • 1Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 305-701, Republic of Korea.

ACS Nano
|February 20, 2014
PubMed
Summary
This summary is machine-generated.

We developed a versatile graphene oxide (GO)-based optical sensor platform for efficient and stable pH detection. This novel sensor exhibits distinct color changes across a wide pH range, showing great potential for biological and environmental monitoring.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemical Sensing

Background:

  • Graphene oxide (GO) offers excellent signal-to-noise ratio and dispersion stability.
  • Developing stable and efficient optical sensors with distinct responses is crucial for various applications.
  • Hybrid materials integrating quantum dots (QDs) and polymers on GO sheets can enhance sensing capabilities.

Purpose of the Study:

  • To develop a versatile platform for a highly efficient and stable graphene oxide (GO)-based optical sensor.
  • To fabricate a colorimetric, GO-based pH sensor with distinctive ratiometric color responses.
  • To demonstrate the applicability of the platform for biological and environmental sensing.

Main Methods:

  • Fabrication of a multi-quantum dot and GO hybrid material (MQD-GO) using pH-responsive polymers.
  • Utilizing blue and orange color-emitting QDs (BQDs and OQDs) with independent pH-responsive linkers (PAA and P2VP).
  • Investigating pH-dependent Förster resonance energy transfer (FRET) efficiencies and elucidating the sensing mechanism via time-resolved fluorescence and dynamic light scattering.

Main Results:

  • The MQD-GO sensor exhibited a color change from orange to near-white to blue across a wide pH range.
  • The sensing mechanism involves independent control of QD photoluminescence by pH-responsive polymers and FRET to GO.
  • The sensor demonstrated excellent reversibility and high dispersion stability in pure water.

Conclusions:

  • A versatile and stable GO-based optical sensor platform has been successfully developed.
  • The MQD-GO sensor provides a ratiometric colorimetric response to pH changes, suitable for wide-range detection.
  • This platform is ideal for biological and environmental applications and can be expanded for other multifunctional sensors.