Sensitive electrochemical determination of rhodamine B based on cyclodextrin-functionalized nanogold/hollow carbon nanospheres

Due to being harmful to the human health, the qualitative and quantitative determination of rhodamine B (RhB) is of great significance. In this paper, per-6-thio-beta-cyclodextrin functionalized nanogold/hollow carbon nanospheres (beta-CD-AuNPs/HCNS) nanohybrids were prepared and then applied successfully for the highly sensitive electrochemical detection of RhB. Due to the synergetic effects from the HCNS (excellent electrochemical properties and large surface area), beta-CD (high host-guest recognition and water-solubility) and AuNPs (excellent electrocatalytic activity), the oxidation peak currents of RhB on the beta-CD-AuNPs/HCNS modified glassy carbon electrode (GCE) are much higher than those on the AuNPs/HCNS/GCE and bare GCE. The beta-CD-AuNPs/HCNS/GCE has a linear response range of 4.79-958.00 mu g L-1 with a detection limit of 0.96 mg L-1 for RhB.