Dual response mimetic enzyme of novel CoS/CoO composite nanotube for antibacterial application.

Novel CoS/CoO composite nanotubes were first time successfully synthesized through the control of NaS treatment of Co(CO)Cl(OH) precursor and testified to having both oxidase-like and peroxidase-like catalytic activities. Through nanoscale Kirkendall effect, acicular precursor was vulcanized to form CoS/CoO nanotubes (NTs). CoS/CoO NTs exhibit great properties such as smaller K and higher V than natural horseradish peroxidase, favorable selectivity and ideal stability. CoS/CoO NTs with promising biocompatibility can realize spectral sterilization towards Escherichia coli and Staphylococcus sciuri in the presence of low level HO. It turned to be that superoxide anion radical catalyzed by CoS/CoO NTs not only oxidizes 3, 3', 5, 5'-tetramethylbenzidine in the catalytic process but also eliminates gram-bacteria during sterilization. The successful synthesis of biofunctional CoS/CoO NTs can serve as significant applications of new energy and environmental catalysis.