A pseudo one-dimensional molecular electronic network consisting of segments of gold nanowires separated by 1−3 nm wide gaps and
interconnected by thiol endcapped oligo(phenenylenevinylene)s (OPVs, 1.3 nm − 1.9 nm long) has been fabricated by lipid templated self-assembly. The electronic properties of the networks have been characterized in three situations in which: (i) only lipid molecules reside in
the gap between gold wire segments or (ii) OPV molecules which are too short to bridge the gap or (iii) OPV molecules that are long enough
to bridge the gap. The resulting network conductivity increases by 2−3 orders of magnitude with increasing covalent contact between OPV
molecules and electrodes. An order of magnitude estimate of the low-bias conductance reveals G ≈ 50 nS for one OPV molecule which is
long enough to covalently bind to both electrodes bridging the gap.
One important requirement for future applications of carbon nanotube
electronic devices is the ability to controllably grow carbon nanotubes on
metal electrodes. Here we show that it is possible to grow small diameter
(<10 nm) vertically aligned carbon nanotubes on different metal underlayers using
plasma-enhanced chemical vapour deposition. A crucial component is the insertion of a thin
silicon layer between the metal and the catalyst particle. The electrical integrity of the
metal electrode layer after plasma treatment and the quality of the metals as interconnects
are also investigated.
The noise properties at room temperature of multiwalled carbon nanotubes under forward bias, for frequencies between 10 Hz–10 kHz, have been investigated. The noise measurements were made for one individual multiwalled carbon nanotube (1 MW) and two crossing multiwalled carbon nanotubes (2 CMW). The excess noise found in 1 MW is consistently 1/f-like. However, 2 CMW shows higher noise level, and the noise spectrum has an unusual dependence on the current. The main origin of noise in 2 CMW was attributed to the diffusion noise.
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