Gas sensor using metal oxide semiconducting nanofiber sensitized by alkali or alkaline earth metal and noble metal catalysts, and manufacturing method thereof

A method of manufacturing metal oxide nanofibers, the method comprising:

• synthesizing a nanoparticle catalyst inside an apoferritin protein template;
• preparing a spinning solution by stirring the apoferritin template containing the nanoparticle catalyst and an alkali or alkaline earth metal salt with a metal oxide precursor/polymer composite solution;
• electrospinning the spinning solution to synthesize metal oxide precursor/polymer composite nanofibers in which the nanoparticle catalyst and the alkali metal or alkaline metal salt are uniformly distributed;
• and
• synthesizing one-dimensional porous metal oxide nanofibers by performing heat treatment on the synthesized composite nanofibers.