Light-emitting nanostructures made by conjugated polymers show interesting emission and electronic properties. In this work we report on novel approaches for the fabrication and control of light-emitting nanofibers by electrospinning. The shape, size and light-emitting properties of the fibers can be specifically tailored by acting on the composition of the solution used for the electrospinning process, an approach allowing for obtaining fibers ranging from micrometer-sized ribbons to almost cylindrical fibers with diameters down to few hundreds of nanometers. Moreover, following proper process optimization these fibers can also be precisely positioned in ordered arrays by near-field electrospinning, a method that exploits the stable region of the polymer jet. The possibility of precisely shaping the conjugated polymer fibers and of assembling the fiber in ordered arrays, combined with enhanced emission properties, opens interesting perspectives for developing novel emitting flexible nanomaterials suitable for light sourcing and optical sensing.
Scanning Auger Microscopy has been applied to study two typical problems in microelectronic features: depth profile analysis and defects. We have performed Auger depth profiles with and without the sample rotation during the sputtering and we have compared the results in terms of interface width and uniformity of the sputtered surface. Atomic Force Microscopy has been used to characterize the surface morphology and its results have been correlated to Auger map data. Microelectronics structures with a sizes of about 400 nm have been studied by means of Auger high resolution maps before and after electrical tests, in order to determine the effects of the tests on their structure.
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