Carbon fiber e.g. multi-walled nano fiber, upper surface etching method for e.g. biosensor, involves functionalizing upper surface of carbon nanofibers by oxidative treatment, where fibers are made of polyacrynitrile

摘要

The method involves functionalizing an upper surface of carbon nanofibers by oxidative treatment, where the fibers are made of polyacrynitrile. Metal particles such as iron, cobalt and nickel, are separated on the functionalized upper surface. The upper surface is etched by treating with water vapor in helium atmosphere. The metal particles are removed by acid treatment. The oxidative treatment is carried out by heating with oxidizing acid or oxygen plasma treatment.