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In situ probing of electromechanical properties



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APPLIED PHYSICS LETTERS 95 172106 2009 In situ probing of electromechanical properties of an individual ZnO nanobelt Anjana Asthana 1 a Kasra Momeni 1 Abhishek Prasad 2 Yoke Khin Yap 2 a and Reza Shahbazian Yassar1 a 1 Department of Mechanical Engineering Engineering Mechanics Michigan Technological University Houghton Michigan 49931 USA 2 Department of Physics Michigan Technological University Houghton Michigan 49931 USA Received 12 August 2009 accepted 1 September 2009 published online 29 October 2009 We report here an investigation on electrical and structural microstructural properties of an individual ZnO nanobelt via in situ transmission electron microscopy using an atomic force microscopy AFM system The I V characteristics of the ZnO nanobelt just in contact with the AFM tip indicates the insulating behavior however it behaves like a semiconductor under applied stress Analysis of the high resolution lattice images and the corresponding electron diffraction patterns shows that each ZnO nanobelt is a single crystalline having wurtzite hexagonal structure a 0 324 nm c 0 520 66 nm with a general growth direction of 101 0 2009 American Institute of Physics doi 10 1063 1 3241075 Nanogenerators 1 piezoelectric field effect transistors 2 and piezoelectric diodes3 were recently developed based on the unique coupling of piezoelectric and semiconducting properties of ZnO nanowires The emergence of this nanopeizotronic area4 requires further understanding on the electromechanical behavior of ZnO nanostructures Although there were a few reports on the electromechanical behavior of ZnO nanowires 5 8 no studies are devoted on the study of ZnO nanobelts which are structurally different Here we present the study on the electrical and structural properties of an individual nanobelt via in situ high resolution transmission electron microscopy TEM atomic force microscopy AFM system All the measurements were carried out on a single tilt AFM TEM holder Nanofactory Instruments in a



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