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Influence of strain on Zinc Oxide nanoparticle films on flexible substrates
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This work aims to study the effect of bending to the structural integrity and electrical
properties of ZnO Nanoparticles (NPs) films on a paper substrate. The films were printedby screen printing technique and afterwords the substrates were submitted to bending cycles. In order to evaluate the effect of bending cycles on the film’s morphology, the first characterization technique was Scanning Electron Microscopy (SEM). It was possible to verify that this stress led to crack formation. Other than imaging techniques, mechanical characterization was used, which was nanoindentation. This technique allowed to conclude that bending led to the decrease of Young’s Modulus (E) of the film which was provoked by the unpacking of the NPs which composed the film. In addition, this unpacking was related with the increment of the film’s resistance. At the electrical characterization stage, two different compositions of ZnO inks were used and deposited on two different types of paper. The lowest resistance value achieved was with the ink that contained water in it’s composition printed on an office paper substrate and had a value of around 250M On the other hand, the measured resistance increases about 40 times (to about 10) when the ink contains toluene in it’s composition and is printed on photographic paper. In order to determinate the influence of toluene to the paper’s surface, a study was performed where some pieces of photographic paper were immersed in toluene for different times. Furthermore, the samples were taken to Fourier Transform Infrared Spectroscopy (FTIR) analysis where it was concluded that the paper’s surface is modified.
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Zinc Oxide Nanoparticles Flexible Electronics Paper Nanondentation Bending