Effect of RGO-Y(2)O(3) and RGO-Y(2)O(3):Cr(3+) nanocomposite sensor for dopamine

The RGO-Y(2)O(3) and RGO-Y(2)O(3): Cr(3+) (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). Y(2)O(3):Cr(3+) 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 (4)F(9/2) → (6)H(15/2), (4)F(9/2) → (6)H(13/2,) and (4)F(9/2) → (6)H(11/2) 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 Y(2)O(3):Cr(3+) and developed a method for the sensor used in analytical applications.