Stochastic resonance (SR) is an intrinsic noise usage system for small-signal sensing found in various living creatures. The noise-enhanced signal transmission and detection system, which is probabilistic but consumes low power, has not been used in modern electronics. We demonstrated SR in a summing network based on a single-walled carbon nanotube (SWNT) device that detects small subthreshold signals with very low current flow. The nonlinear current-voltage characteristics of this SWNT device, which incorporated Cr electrodes, were used as the threshold level of signal detection. The adsorption of redox-active polyoxometalate molecules on SWNTs generated additional noise, which was utilized as a self-noise source. To form a summing network SR device, a large number of SWNTs were aligned parallel to each other between the electrodes, which increased the signal detection ability. The functional capabilities of the present small-size summing network SR device, which rely on dense nanomaterials and exploit intrinsic spontaneous noise at room temperature, offer a glimpse of future bio-inspired electronic devices.
Single walled carbon nanotube-based stochastic resonance device with molecular self-noise source
Hayato Fujii, Agung Setiadi, Yuji Kuwahara, Megumi Akai-Kasaya; Single walled carbon nanotube-based stochastic resonance device with molecular self-noise source. Appl. Phys. Lett. 25 September 2017; 111 (13): 133501. https://doi.org/10.1063/1.4986812
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