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A multitude of existing technologies are based on the ability of converting light into electrical signals. Graphene has demonstrated a number of optical and transport properties [1] which are promising for this type of optoelectronic applications and great efforts have been devoted to the development of graphene-based photodetectors. Being a gapless semiconductor, graphene enables light absorption...
We present spatially resolved Raman studies on individual single-walled carbon nanotubes (SWNTs). Samples were comprised of microheaters with integrated and suspended SWNTs. We found the phonon frequency to depend on temperature by domega/dT = -0.0305 cm-1/K. The highest measured local temperature in a SWNT was about 1000 K. Further studies emphasize the effect of temperature on the energy shift of...
We report on the fabrication and measurements of the first NO2 gas sensors based on individual suspended single-walled carbon nanotubes (SWNTs). We analyze the transient current response of two types of SWNTs when exposed to NO2 in dry and humid air. Furthermore, we analyze the change in the gate characteristic of the SWNTs due to NO2 and propose two different transduction mechanisms in suspended...
We report on the (opto-)mechanical properties of integrated single-walled carbon nanotubes. Individual nanotubes were integrated into micro-actuators by a simple location-controlled integration process. These structures allowed for reproducible strain-dependent Raman analysis of individual nanotubes under various levels of tensile strain. The nanotubes were suspended in air, reducing the support interaction...
We report on nano electromechanical transducers based on single-walled -carbon nanotubes (SWNTs) in order to investigate the piezoresistance of individual SWNTs, which are at present one of the most studied nano structures, showing promising physical properties. We show a theoretical and experimental analysis of electromechanical properties of SWNTs, highlighting their extraordinary potential and...
We investigated the growth of individual single-walled carbon nanotubes (SWNTs) by low pressure chemical vapor deposition (LPCVD) on Ferritin-based Fe catalyst. According to Ferritin adsorption measurements, we show that the SWNT density on the surface can be controlled by the Ferritin concentration in the adsorption solution. The grown SWNTs were contacted by Cr/Au layers, structured by electron...
We present a fabrication technique for discrete, released carbon-nanotube-based nanomechanical force sensors. The fabrication technique uses prepatterned coordinate markers to align the device design to predeposited single-walled carbon nanotubes (SWNTs): Atomic force microscope (AFM) images are recorded to determine spatial orientation and location of each discrete nanotube to be integrated in a...
We report on the performance of a multi-purpose strain sensor for embedded carbon nanotubes (CNT). The sensor is based on a microactuator operable in various environments including in situ scanning electron microscopy (SEM) and Raman microscopy from the same tube. The fabrication of the MEMS was outsourced to a foundry process first and then post-processed to integrate the nanotubes and to complete...
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