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Effect of RGO-Y2O3 and RGO-Y2O3:Cr3+ nanocomposite sensor for dopamine.

J K Shashikumara1, Bhimanagouda Kalaburgi2, B E Kumara Swamy3

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Researchers developed a graphene-based nanocomposite for electrochemical dopamine detection. This novel sensor shows promise for analytical applications due to enhanced conductivity and current response.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Electrochemistry

Background:

  • Graphene-based nanocomposites offer unique properties for sensor development.
  • Yttrium oxide doped with chromium (Y2O3:Cr3+) exhibits distinct photoluminescent characteristics.
  • Developing sensitive and selective electrochemical sensors is crucial for analytical applications.

Purpose of the Study:

  • To synthesize and characterize reduced graphene oxide (RGO) and RGO-Y2O3:Cr3+ nanocomposites (NCs).
  • To investigate the structural, morphological, and photoluminescent properties of the synthesized NCs.
  • To evaluate the performance of the NCs in modified carbon paste electrodes (MCPEs) for the electrochemical detection of dopamine (DA).

Main Methods:

  • Hydrothermal synthesis technique for NC preparation.
  • X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) for characterization.
  • Fabrication of MCPEs using the synthesized NCs for electrochemical sensing.

Main Results:

  • The RGO-Y2O3:Cr3+ NCs exhibited a wrinkly texture with ultrathin graphene sheets and spherical Y2O3:Cr3+ particles.
  • Photoluminescence emission spectra showed distinct peaks in blue, orange, and red regions, corresponding to specific electronic transitions.
  • The MCPEs demonstrated a good current response for the voltammetric detection of dopamine at pH 7.4.

Conclusions:

  • Doping Y2O3:Cr3+ with Cr3+ effectively enhances conductivity.
  • The RGO-Y2O3:Cr3+ NCs are suitable for developing modified electrodes for electrochemical sensing.
  • The developed sensor shows potential for analytical applications in dopamine detection.