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This thesis examines a novel class of flexible electronic material
with great potential for use in the construction of stretchable
amplifiers and memory elements. Most remarkably the composite
material produces spontaneous oscillations that increase in
frequency when pressure is applied to it. In this way, the material
mimics the excitatory response of pressure-sensing neurons in the
human skin. The composites, formed of silicone and graphitic
nanoparticles, were prepared in several allotropic forms and
functionalized with naphthalene diimide molecules. A systematic
study is presented of the negative differential resistance (NDR)
region of the current-voltage curves, which is responsible for the
material's active properties. This study was conducted as a
function of temperature, graphite filling fraction, scaling to
reveal the break-up of the samples into electric field domains at
the onset of the NDR region, and an electric-field induced
metal-insulator transition in graphite nanoparticles. The effect of
molecular functionalization on the miscibility threshold and the
current-voltage curves is demonstrated. Room-temperature and
low-temperature measurements were performed on these composite
films under strains using a remote-controlled, custom-made step
motor bench.
This thesis examines a novel class of flexible electronic material
with great potential for use in the construction of stretchable
amplifiers and memory elements. Most remarkably the composite
material produces spontaneous oscillations that increase in
frequency when pressure is applied to it. In this way, the material
mimics the excitatory response of pressure-sensing neurons in the
human skin. The composites, formed of silicone and graphitic
nanoparticles, were prepared in several allotropic forms and
functionalized with naphthalene diimide molecules. A systematic
study is presented of the negative differential resistance (NDR)
region of the current-voltage curves, which is responsible for the
material's active properties. This study was conducted as a
function of temperature, graphite filling fraction, scaling to
reveal the break-up of the samples into electric field domains at
the onset of the NDR region, and an electric-field induced
metal-insulator transition in graphite nanoparticles. The effect of
molecular functionalization on the miscibility threshold and the
current-voltage curves is demonstrated. Room-temperature and
low-temperature measurements were performed on these composite
films under strains using a remote-controlled, custom-made step
motor bench.
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