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

J K Shashikumara,Bhimanagouda Kalaburgi,S C Sharma,B E Kumara Swamy,H Nagabhushana,P Lalitha

doi:10.1038/s41598-021-87749-z

J K Shashikumara, Bhimanagouda Kalaburgi + Show 4 more

Open Access

https://doi.org/10.1038/s41598-021-87749-z

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Abstract

The RGO-Y2O3 and RGO-Y2O3: Cr3+ (5 mol %) nanocomposite (NC) synthesized by hydrothermal technique. The structure and morphology of the synthesized NCs were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). Y2O3:Cr3+ displays spherical-shaped particles. Conversely, the surface of the RGO displays a wrinkly texture connecting with the existence of flexible and ultrathin graphene sheets. The photoluminescence (PL) emission spectra showed series of sharp peaks at 490, 591, and 687 nm which corresponding to 4F9/2 → 6H15/2, 4F9/2 → 6H13/2, and 4F9/2 → 6H11/2 transitions and lies in the blue, orange, and red region. The prepared NCs were used for the preparation of modified carbon paste electrodes (MCPE) in the electrochemical detection of dopamine (DA) at pH 7.4. Both modified electrodes provide a good current response towards voltammetric detection of DA. Doping is an effective method to improve the conductivity of Y2O3:Cr3+ and developed a method for the sensor used in analytical applications.

Highlights

The reduced graphene oxide (RGO)-Y2O3 and RGO-Y2O3: Cr3+ (5 mol %) nanocomposite (NC) synthesized by hydrothermal technique
The Graphene oxide (GO) exhibited a distinctive (001) peak at 2θ = 11° (JCPDS No 89-8490) with an interlayer distance of 0.8 nm, which is larger than the interlayer distance of graphite (0.34 nm), revealing that many different oxygen-containing groups were intercalated within the Scientific Reports | (2021) 11:9372 |
Most of the powder X-ray diffraction (PXRD) peaks of the Y 2O3:Cr3+/RGO hybrids were similar to those of the Y 2O3:Cr3+ NPs with minor variations in the peak positions (broadening, change in the intensity of the diffraction profiles, which showed that Y 2O3:Cr3+ is effectively anchored onto RGO which was auxiliary proved by the absence of a sharp (002) diffraction peak in the Y2O3:Cr3+/RGO hybrid

Summary

Introduction

The RGO-Y2O3 and RGO-Y2O3: Cr3+ (5 mol %) nanocomposite (NC) synthesized by hydrothermal technique. The prepared RGO-Y2O3 and RGO-Y2O3: Cr+3 MCPEs provide good selectivity, high sensitivity, and excellent stability and reproducibility over several days.

Results

Conclusion