Modification of a carbon ionic liquid electrode by using palladium nanoparticles –capped carbon nitride quantum dots for selective determination of dopamine

In this study, we synthesis the Pd nanoparticles (NPs) using graphitic-carbon nitride (g-C3N4) quantum dots (QDs) and photochemical routes [1], and the use of the material in an voltametric sensor to determination of dopamine (DA). Using of Pd-NPs in modified electrodes can resolve the overlapped voltammetric waves of compounds such as Ascorbic acid (AA) and DA into two well-defined voltammetric peaks [2]. It is necessary to load them on the surface of a supporting substrate, which has high conductivity, large surface area, low cost, etc. Graphitic carbon nitride (gC3N4) is a graphite-like layered material that is composed of ordered tri-s-triazine subunits connected by planar tertiary amino groups within layers and weak van der Waals forces between layers [3]. gC3N4 quantum dots (CNQDs) with size of 3 nm contain a very high nitrogen content and abundant dangling bonds [3], and they have potential application as crystal seeds for the growth of Pd to form the gC3N4–Pd heterocomposite. Coupling of ionic liquid and nanomaterials can be improve electrical conductivity bare electrodes for trace analysis of electroactive compounds.