The porous Co 3 O 4 nanowires have been successfully synthesized via modified template method. A possible growth mechanism governing the formation of such 1D nanowires is proposed. The as-prepared products have been characterized by X-ray Powder Diffraction (XRD), Extended X-ray Absorption Fine-structure (EXAFS), High-resolution Transmission Electron Microscopy (HRTEM) and N 2 adsorption/desorption analysis. Our systematic studies have revealed that the porous Co 3 O 4 nanowires show excellent gas sensing performances, which demonstrate the potential application of the 1D nanostructured Co 3 O 4 in the detection of the ethanol gas as a sensor material. The improved performances are owing to its large specific surface area and porous morphology. [4][5][6][7]. In particular, the thermal conversion of cobalt nitrate hexahydrate in silica templates to nanowires has proven to be promising. Thus, it is worthwhile to study the gas-sensing characteristics of one-dimensional (1D) Co 3 O 4 nanowires. The extended X-ray absorption fine-structure (EXAFS) technique is a powerful tool for probing the local atomic structures because of its element specificity and independence of the long-range order of materials [8]. The EXAFS spectra have provided many quantitative structural parameters such as interatomic distance, co-ordination number, and Debye-Waller factor [9]. EXAFS study is an indispensable method for investigate the local structure in the interior and at the surface, as well as bonding information of a variety of solid-state materials [10]. Herein, we report on a template synthesis leading to porous Co 3 O 4 nanowires using SBA-15 as hard templates. Moreover, the local structure in the interior and at the surface of the Co 3 O 4 nanowires and the bulk Co 3 O 4 were studied by EXAFS. The gas-sensing application of the as-prepared porous Co 3 O 4 nanowires was systematically investigated in detail.
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