Functionalization of Reduced Graphene Oxide with -cyclodextrin Modified Palladium Nanoparticles for the Detection of Hydrazine in Environmental Water Samples

A sensitive and selective hydrazine sensor was developed by -cyclodextrin modified palladium nanoparticles decorated reduced graphene oxide (PdNPs--CD/rGO) nanocomposite. The PdNPs--CD/rGO hybrid material was prepared by simple electrochemical method. The hydrophobic cavity of -CD ineracts with palladium nanoparticles by hydrophobic interaction and further it is uniformly assembled on the rGO surface through hydrogen bond formation, which is clearly confirmed by FT-IR, FESEM and TEM. The high electrocatalytic activity of hydrazine oxidation was observed at -0.05V (vs. Ag/AgCl) on PdNPs--CD/rGO modified electrode; due to the excellent stabilization, high catalytic activity and large surface area of the PdNPs--CD/rGO composite. The PdNPs--CD/rGO fabricated hydrazine sensor exhibited an excellent analytical performance, including high sensitivity (1.95AM(-1)cm(-2)), lower detection limit (28nM) and a wide linear range (0.05 to 1600M). We also demonstrated that the PdNPs--CD/rGO nanocomposite modified electrode is a highly selective and sensitive sensor towards detection of hydrazine among the various interfering species. Hence, the proposed hydrazine sensor is able to determine hydrazine in different water samples.