Low-Frequency Noise Spectroscopy at Nanoscale: Carbon Nanotube Materials and Devices

Gasparyan, F. V.

doi:10.5772/20026

Cited by 7 publications

(5 citation statements)

References 114 publications

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“…These results suggest that this LF noise can be mostly attributed to the intrinsic thermal noise. In general, this trend has been interpreted using the following noise analytical model, ,where A is the noise amplitude, I is the driving current, and k B and γ are the Boltzmann constant and the frequency exponent, respectively. − The parameter γ was generally found to be close to 1 in a condensed matter system including semiconductor transistors in the quasi-equilibrium state . For the proposed stretchable STL, this parameter ranged from 0.9 to 1.5, depending on the strain.…”

Section: Results and Discussionmentioning

confidence: 99%

“…This was not expected because the passivation layer in the proposed resistance-invariant stretchable STL was thought to exert significant effects only at low strains, where electrical contacts between folded CNT layers do not occur owing to the passivation. One possible explanation for noise suppression in the passivated sample subject to high strains could be that conduction paths are not exposed to air and/or moisture, which are known to induce surface charge fluctuations in the conduction path. ,,, But the fact that alumina passivation did not fully cover the CNT bundles inside the sheet make the above explanation less plausible. Instead, the protection of connected parts between CNTs having van der Waals interaction may also reduce the noise under the assumption that the majority of stresses at high strains are focused on those junctions potentially generating charge fluctuations due to, for example, varying contact resistances.…”

Section: Results and Discussionmentioning

confidence: 99%

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Ultrastretchable Analog/Digital Signal Transmission Line with Carbon Nanotube Sheets

Lee

Joo

et al. 2017

ACS Appl. Mater. Interfaces

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Stretchable conductors can be used in various applications depending on their own characteristics. Here, we demonstrate simple and robust elastomeric conductors that are optimized for stretchable electrical signal transmission line. They can withstand strains up to 600% without any substantial change in their resistance (≤10% as is and ≤1% with passivation), and exhibit suppressed charge fluctuations in the medium. The inherent elasticity of a polymeric rubber and the high conductivity of flexible, highly oriented carbon nanotube sheets were combined synergistically, without losing both properties. The nanoscopic strong adhesion between aligned carbon nanotube arrays and strained elastomeric polymers induces conductive wavy folds with microscopic bending of radii on the scale of a few micrometers. Such features enable practical applications such as in elastomeric length-changeable electrical digital and analog signal transmission lines at above MHz frequencies. In addition to reporting basic direct current, alternating current, and noise characterizations of the elastomeric conductors, various examples as a stretchable signal transmission line up to 600% strains are presented by confirming the capability of transmitting audio and video signals, as well as low-frequency medical signals without information distortion.

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Section: Results and Discussionmentioning

confidence: 99%

Section: Results and Discussionmentioning

confidence: 99%

Ultrastretchable Analog/Digital Signal Transmission Line with Carbon Nanotube Sheets

Lee

Joo

et al. 2017

ACS Appl. Mater. Interfaces

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“…In general, low-frequency noise components in nanomaterials consists of flicker noise (1/f ), generationrecombination noise (GR) and thermal noise. [28][29][30] Thermal noise is generated by the random motion of electrons and it is independent of frequency, thus it appears as horizontal baseline in PSD. GR noise appears as a Lorentzian-shaped curve with corner frequency f c in PSD.…”

Section: Methodsmentioning

confidence: 99%

Spontaneous spike signals originated from redox-active molecules functionalised on carbon nanotubes

Goh

Fujii

Setiadi

et al. 2019

Jpn. J. Appl. Phys.

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Biological computing has always been an interesting and promising field due to its high optimisation and energy frugality in problem-solving. Frequency and timing of the neural spike signal define how the information processing works in biological neural networks. Here, we demonstrate that the addition of redox-active polyoxometalate (POM) molecules to carbon nanotube (CNT) parallel multi-junctions provides an interesting spike signal. The redox state of POM molecules at the junction between CNTs and metal electrodes contributes to the generation of spike signal merely by the use of small DC bias. However, the spike signal from the device was frequently disrupted by the phase transition in the output current. It was elucidated that the lifetime of redox state exhibited by POM is the principal determinant of spike signal generation in a CNT/POM network.

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“…The phenomenon of the low-frequency (LF) fluctuation of electric current in semiconductors and semiconductor devices is the subject of investigations by many researchers and engineers. [26][27][28][29][30][31] Studies have shown that the behavior and magnitude of LF noise in devices based on nanosize silicon structures differs essentially from the noise in devices based on crystalline silicon.…”

Section: Signal-to-noise Ratio (Snr) and Ph Sensitivitymentioning

confidence: 99%

Double-gated Si NW FET sensors: Low-frequency noise and photoelectric properties

Gasparyan

Khondkaryan

Arakelyan

et al. 2016

Journal of Applied Physics

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A pH sensor with a double-gate silicon nanowire field-effect transistor Appl. Phys. Lett. 102, 083701 (2013) The transport, noise, and photosensitivity properties of an array of silicon nanowire (NW) p þ -p-p þ field-effect transistors (FETs) are investigated. The peculiarities of photosensitivity and detectivity are analyzed over a wide spectrum range. The absorbance of p-Si NW shifts to the short wavelength region compared with bulk Si. The photocurrent and photosensitivity reach increased values in the UV range of the spectrum at 300 K. It is shown that sensitivity values can be tuned by the drain-source voltage and may reach record values of up to 2-4 A/W at a wavelength of 300 nm at room temperature. Low-frequency noise studies allow calculating the photodetectivity values, which increase with decreasing wavelength down to 300 nm. We show that the drain current of Si NW biochemical sensors substantially depends on pH value and the signal-to-noise ratio reaches the high value of 10

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Low-Frequency Noise Spectroscopy at Nanoscale: Carbon Nanotube Materials and Devices

Cited by 7 publications

References 114 publications

Ultrastretchable Analog/Digital Signal Transmission Line with Carbon Nanotube Sheets

Ultrastretchable Analog/Digital Signal Transmission Line with Carbon Nanotube Sheets

Spontaneous spike signals originated from redox-active molecules functionalised on carbon nanotubes

Double-gated Si NW FET sensors: Low-frequency noise and photoelectric properties

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