Design of a highly sensitive and selective C2H5OH sensor using p-type Co3O4 nanofibers

作者：Yoon Ji Wook; Choi Joong Ki; Lee Jong Heun^*

来源：Sensors and Actuators B: Chemical , 2012, 161(1): 570-577.

DOI：10.1016/j.snb.2011.11.002

• Co3O4 nanofibers
• Gas sensor
• Electrospinning
• p-type
• Gas sensing mechanism

The Co3O4 nanofibers were prepared by electrospinning and their gas sensing characteristics were investigated. The Co3O4 sensors prepared by heat treatment of as-spun precursor fibers at 500 and 600 degrees C showed well-developed one-dimensional morphologies and exhibited high responses to 100 ppm C2H5OH (R-g/R-a = 51.2 and 45.3; R-g, resistance in gas; R-a, resistance in air) at 301 degrees C with negligible cross-responses to 100 ppm CO, C3H8, and H-2 (R-g/R-a = 1.02-2.7). In contrast, the most of one-dimensional morphology of the Co3O4 specimen was lost and the response to 100 ppm C2H5OH became significantly lower when the heat treatment temperature was increased to 700 degrees C or when the nanofibers were ultrasonically disintegrated into primary particles. The significant decrease of the gas response was explained and discussed in relation to the gas sensing mechanism of a p-type semiconductor, the morphology of specimens, and the connecting configuration between nanoparticles and nanofibers.

• 出版日期2012-1-3