“…[7][8][9][10][11][12][13][14] To optimize the gas performance of Co 3 O 4 , a large amount of effort has been made to control the morphology and size of Co 3 O 4 in the previous studies. 8,13,15,16 The synthesis of various nanostructures of Co 3 O 4 such as nanoparticles, 17 nanorods, 6,7 nanobers, 10,18,19 nanosheets 20 and hollow nanospheres 9 has been carried out by using varieties of techniques including electrospinning, 18 hydrothermal methods, 12 solid state thermal decomposition, etc. 17,20 Among these Co 3 O 4 based nanomaterials, a one-dimensional nanowire array is considered to be a promising architecture with a high chemical response.…”