Synthesis of nonstoichiometric CeO2@CNT core/shell nanowire arrays and their applications in biosensing

摘要

Nonstoichiometric CeO2@CNT core/shell nanowire arrays (NWAs) were synthesized by hydrothermal method in combination with chemical vapor deposition. Morphology and microstructure of the core/shell NWAs were characterized by SEM, XRD, TEM and Raman spectrum techniques. The novel nonstoichiometric CeO2@CNT core/shell NWAs were employed as substrates to construct cholesterol electrochemical biosensors. They showed high sensitivity of 336.6 mu A cm(-2) mM(-1) and low detection limit of 7.4 mu m towards cholesterol detection at working potential of -0.4 V due to synergistic effect of nonstoichiometric CeO2 and CNT, and they also demonstrated excellent selectivity towards interferents co-existing with cholesterol in blood serum.