Abstract
Zinc oxide (ZnO) nanowires were synthesised through two different methods; the vapour liquid solid (VLS) method and an aqueous solution method. Each method had its own set of parameters and changes in those parameters influenced the output voltage of a nanogenerator. Changes in output voltage occurred as a result of variations in the resistance and the carrier concentration of grown nanowires as the piezoelectric charges were screened or trapped. An optimal value for both the resistance and the carrier concentration was determined in order to optimise the output voltage.
Highlights
Research into zinc oxide (ZnO) thin films and nanowires have been increasing over the last couple of years
The chemicals react within the solution to form ZnO nanowires on the pretreated substrates that are floating on top of the solution [13,14]
Summary ZnO nanowires were prepared via two different methods, vapour liquid solid (VLS) and an aqueous solution method
Summary
Research into zinc oxide (ZnO) thin films and nanowires have been increasing over the last couple of years. The research has led to the development of numerous ZnO thin film and nanowire based devices ranging from surface acoustic wave filters [1], photonic crystals [2], light emitting diodes [3], photodetectros [4], photodiodes [5], gas sensors [6] and solar cells [7], to name a few This is due to the unique properties of ZnO including a wide bandgap (3.37 eV) as well as specific electrical and optoelectrical properties of the II-VI semiconductor group [2,3,4]. In the process of manufacturing the nanogenerators, the nanowires are synthesised by various methods and on various substrates
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