Radio Frequency Carbon Nanotube Thin-Film Bolometer

Gasper, Michael R.; Toonen, Ryan C.; Hirsch, Samuel; Ivill, M.; Richter, Hanz; Ramesh, Sivarajan

doi:10.1109/tmtt.2017.2677444

Cited by 4 publications

(2 citation statements)

References 14 publications

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“…10. The improved graphene detectors exceed the sensitivity of previously reported graphene detectors, 0.86 mV/mW [2], as well as previously explored carbon nanotube bolometers, 0.36 mV/mW, [16], [17]. We attribute microwave power detection in the material system under test primarily to the thermoelectric effect [3] with possible contributions of signal rectification due to the nonlinear conduction of the the voltage-gated graphene device.…”

Section: Power Detectionmentioning

confidence: 53%

Microwave Power Detection With Voltage-Gated Graphene

Gasper

Toonen

Varaljay

et al. 2020

IEEE Open J. Nanotechnol.

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Commercially available, chemical vapor deposition grown, graphene has been used to realize voltage-gate tunable, microwave power detectors. Corbino disc structures with chrome/gold contacts have been fabricated on top of graphene deposited on P-type silicon substrates with silicon dioxide gate oxides. Devices of varying sizes were used to detect a 433.92 MHz signal. These test structures exhibited a peak power detection sensitivity of 3.25 mV/mW at 292 K and 5.43 mV/mW at 80 K. The improved graphene detectors exceed the sensitivity of previously reported graphene detectors, 0.86 mV/mW, as well as previously explored carbon nanotube bolometers, 0.36 mV/mW.

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Section: Power Detectionmentioning

confidence: 53%

Microwave Power Detection With Voltage-Gated Graphene

Gasper

Toonen

Varaljay

et al. 2020

IEEE Open J. Nanotechnol.

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“…The obtained films demonstrate a high TCR over a wide temperature range, up to −2.8%K −1 , however, those values were measured at temperatures much lower than room temperature, i.e., at liquid nitrogen temperature [18]. On the other hand, reported work indicates that a radio frequency bolometer was implemented using a thermistor fabricated from a carbon nanotube thin film deposited on a sapphire substrate, with the thermistor held at a temperature of 15 • C. The bolometer sensitivity at 915 MHz was found to be 0.36 mV/mW, however these values of data points were collected while sweeping the bias up from 1 to 30 V [19].…”

Section: Introductionmentioning

confidence: 99%

Tuning Bolometric Parameters of Sierpinski Fractal Antenna-Coupled Uncracked/Cracked SWCNT Films by Thermoelectric Characterization at UHF Frequencies

et al. 2022

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In this work, the bolometric parameters of Sierpinski fractal antenna-coupled SWCNT semi-metallic films are obtained by thermoelectric characterization, this in order to find out the performance as bolometer. The method was based on an experimental setup considering a line-of-sight wireless link between two identical planar fractal antennas, infrared thermography, and electrical resistance measurements. The experimental setup considered the antennas resonant frequencies. Both the transmitting and receiving antenna were third-iteration Sierpinski fractal dipoles designed to work at UHF frequencies. Films made either of cracked or uncracked SWCNT films were each separately coupled to the receiving fractal antenna. Measurements showed that the receiving antenna that was impinged with radiation at UHF frequencies coming from the transmitting antenna, experienced as it was expected an induction of electric current, the induced current flowed through the film producing a temperature change, which in turn caused changes in the radiated heat of the film, as well as changes in the electrical resistance known as Temperature Coefficient of Resistance TCR. The maximum value of TCR for uncracked SWCNT films was −3.6%K−1, higher than the one observed for cracked SWCNT films which exhibited a maximum value of −1.46%K−1. Measurements for conversion of incident radiation to electrical signals known as the Voltage Responsivity ℜv, exhibited values of 9.4 mV/W and 1.4 mV/W for uncracked SWCNT films and cracked SWCNT films, respectively.

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