| 초록 |
Chemical and biological sensor technologies have received much attension in the last decade and undergone much developments because of a profound impact on personal safety, detection of toxic pollutants, and recently, on the realization of the internet of things (IOT).[1-3] So far, most of works have focused on the developement of sensor technologies with high sensitivity and selectivity. Many groups have successfully demonstrated such sensors by fabricating a variety of multicomponent sensor arrays, known as electronic noses.[4-6] With recent advances in wearable electronics, the electronic nose is expected to provide us with reliable and sustainable healthcare services through big data processing. This approach will speed-up the commercialization success of the electronic nose technologies. However, a large number of sensors in array brings about more power supply although many innovative ways to reduce power consumption were suggested.[7,8] Therefore, the realization of self-powered sensors that are capable of detecting several gases without the need of external power sources is critical to performance of the electronic nose. Here, a self-powered electronic nose strategy with highly selective gas detection is described. The electronic nose is a two-dimensional microarray based on the triboelectrification between ZnO nanowires and dielectric layers, and heterogeneous catalytic reaction occurring on the nanowires and on the NiO nanoparticles. The electronic noses show their ability to distinguish four VOCs gases (methanol, ethanol, acetone, and toluene) with a detection limit of 0.1 % at room temperature with no external power source. |
