摘要
Precise measurements of the piezoelectric signals are essential for tailoring the properties of ZnO nanowire(NW)based energy conversion devices.We characterize three-dimensional piezoelectric potential profiles of NW arrays using a kelvin probe force microscope(KPFM).A specific device composed of vertically aligned ZnO NWs and thermal responsive polymers is designed for the KPFM test to eliminate surface roughness influence and to avoid mechanical vibrations.The KPFM images show increasing contrasts between the NW and polymer area with the rising temperature,revealing the accumulation of piezoelectric charges.The piezoelectric signals measured by KPFM are around 10 times larger than those measured using external electric circuits.
作者
王现英
谢澍梵
陈晓冬
刘洋洋
WANG Xian-Ying;XIE Shu-Fan;CHEN Xiao-Dong;LIU Yang-Yang(School of Materials Science and Technology,University of Shanghai for Science and Technology,Shanghai 200093)
基金
the National Natural Science Foundation of China(51072119)
the Innovation Program of Shanghai Municipal Education Commission(12ZZ139)
SRF for ROCS,SEM.