Rational Design of Hierarchical CoO/NiO Nanosheets on Conductive Polypyrrole Nanotubes for Peroxidase Mimicking and Sensing Application

Abstract

Recently, hybrid biocatalysts with a unique interfacial structure have attracted significant attention for enzyme mimicking due to their superior catalytic activity compared with the single component catalyst. In this work, novel sheet-on-tube heterostructured polypyrrole (PPy)@CoO/NiO nanotubes (NTs) are synthesized via an in situ growth strategy and are utilized for enzyme mimicking and sensing applications. The as-prepared PPy@CoO/NiO NTs can catalyze H2O2 into ·OH and realize the 3,3′,5,5′-tetramethylbenzidine (TMB) oxidation, showing an excellent peroxidase-like property. Thanks to the synergistic effect between PPy NTs and CoO/NiO nanosheets, the catalytic performance of the resultant PPy@CoO/NiO NTs is superior to individual PPy NTs and bare CoO/NiO sheets as well as their physical mixture. In addition, the PPy@CoO/NiO NTs can also catalyze the H2O2 decomposing to generate O2, possessing a catalase-like property. Then, we perform a simple visual method for sensitively detecting H2O2 and ascorbic acid (AA). This work demonstrates a distinctive route to promote the catalytic performance of enzyme-like nanomaterials for huge potentials in biotechnology and environment fields.

Fiber-in-Tube Design of a CuFe2O4@Conducting Polymer with Synergistically Enhanced Peroxidase-like Activity for Total Antioxidant Capacity Assays

“…For comparison, pristine PPy nanotubes have also been prepared by using PAN nanofibers as templates. 33 Typically, PAN nanofibers were prepared with a common electrospinning strategy. Then, 50 mg of PAN nanofibers was put into 50 mL of water.…”

“…Subsequently, the vacuum desiccator was vacuumed until the HCl solution starting boiling and then placed at room temperature for 2, 3, and 4 h. Finally, the CuFe 2 O 4 @PPy hybrids with different morphologies were obtained (marked as CuFe 2 O 4 @PPy-2h, CuFe 2 O 4 @PPy-3h, and CuFe 2 O 4 @PPy-4h). For comparison, pristine PPy nanotubes have also been prepared by using PAN nanofibers as templates . Typically, PAN nanofibers were prepared with a common electrospinning strategy.…”

Electrospun Aspirin/Eudragit/Lipid Hybrid Nanofibers for Colon-targeted Delivery Using an Energy-saving Process

“…Electrospinning, an abbreviation of electrostatic spinning, belongs to an electrohydrodynamic atomization(EHDA) method [1][2][3] . Based on the strong, intensive and fast interactions between the electrostatic energy and the electrospinnable polymeric fluid, solid nanofibers can be generated within the time scale of several milliseconds [4][5][6][7][8][9] .…”

Transition metal sulfides meet electrospinning: versatile synthesis, distinct properties and prospective applications

“…Recently, conducting polymers have been proved to significant enhance the enzyme-like property of nanozymes. [231][232][233] The abundant functional groups of conducting polymers offer a better affinity of the hybrid nanozyme, providing an excellent kinetic process. In addition, the…”