Terahertz conductivity studies in carbon nanotube networks prepared by the vacuum filtration method

Lamela, Horacio; Dadrasnia, Ehsan; Lee, Dong-Mok; Baik, Seunghyun; Kuppam, Mohan Babu; Garet, Frédéric; Coutaz, Jean‐Louis

doi:10.1117/12.931511

Cited by 7 publications

(8 citation statements)

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“…The refractive index of MWCNT1 is seen to be higher than MWCNT2. As seen, the values obtained using the NRW method are consistent with the results achieved by the THZ-TDS method [14]. The frequency dependent conductivity values obtained from the imaginary part of permittivity, using σ = ε 2 ε 0 ω, for both sets of samples are also shown.…”

Section: Extraction Of Parameterssupporting

confidence: 85%

Sub‐THz characterisation of multi‐walled carbon nanotube thin films using vector network analyser

et al. 2014

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A vector network analyser is used to study the electrical properties of multi-walled carbon nanotube (MWCNT) thin films deposited on a fused quartz substrate in the sub-terahertz (THz) frequency ranges of 220-325 GHz (WR3.4) and 325-500 GHz (WR2.2). The experiment is performed in free space. The complex permittivity of the MWCNT thin films is extracted using the Nicholson-Ross-Weir method. The refractive index and conductivity are then determined from the extracted permittivity. The method is validated by comparison with values obtained using THz time-domain spectroscopy

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Section: Extraction Of Parameterssupporting

confidence: 85%

Sub‐THz characterisation of multi‐walled carbon nanotube thin films using vector network analyser

et al. 2014

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“…The THz responses of the samples have been characterized using a conventional THz-TDS setup [22,23]. The samples are located at the waist of the THz beam: at any frequency of the available THz signal, the Rayleigh length of the beam is much larger than the bare or covered substrate; therefore, the sample can be considered as illuminated at normal incidence by a plane wave.…”

Section: Time-domain Spectroscopy and Thz Signalsmentioning

confidence: 99%

Determination of the DC Electrical Conductivity of Multiwalled Carbon Nanotube Films and Graphene Layers from Noncontact Time-Domain Terahertz Measurements

Dadrasnia

Lamela

Kuppam

et al. 2014

Advances in Condensed Matter Physics

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Measuring the DC conductivity of very thin films could be rather difficult because of the electrical contact issue. This DC conductivity can, however, be extracted from noncontact measurements at GHz and THz frequencies using elaborated conductivity models that nicely fit the experimental data. Here we employ this technique to study the DC conductivity of fragile nanometer-thick films of multiwalled carbon nanotubes and monolayer graphene. The THz response of the films is measured by THz time-domain spectroscopy. We show that the THz conductivity of the samples is well fitted by either Drude-Lorentz model or Drude-Smith model, giving information on the physics of electrical conductivity in these materials. This extraction procedure is validated by the good agreement between the so-obtained DC conductivity and the one measured with a classical 4-point probe in-line contact method.

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“…The fused quartz substrates are of thickness 2.15 mm with a refractive index of about 1.95. The absorption coefficient of the substrate is nearly zero in the frequency range of 225–500 GHz . The sample is treated as an effective medium.…”

Section: Resultsmentioning

confidence: 99%

Optical properties of carbon nanotube thin films in subterahertz frequency regime

Puthukodan

Dadrasnia

Vinod

et al. 2014

Microw. Opt. Technol. Lett.

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values of length, width, and position parameters of the ground slot is obtained. The antenna presents three single wide band states and two dual band states including UWB states. The proposed configuration was first optimized using the IE3D software [6] followed by experimental verification. Due to multiband functionality and low profile nature, the proposed antenna is suitable for the applications in wireless multiradio systems.ABSTRACT: Multiwalled carbon nanotube (MWCNT) thin films deposited on fused quartz substrates are characterized by continuous wave subterahertz free space technique using a vector network analyzer (VNA). The scattering (S) parameters are measured by a VNA in the frequency range of 220-325 GHz (G-band) and 325-500 GHz (Y-band). The complex refractive index is extracted with the help of Nicholson-Ross-Weir method. The transmission and absorption of the thin films are also studied. VNA offers a good spectral resolution and a dynamic range of 60-70 dB around 500 GHz. The experimental technique and material parameter extraction procedures are described. The refractive ABSTRACT: The utilization of UHF Radio Frequency Identification tag to monitor the tire history in automotive tire applications is presented. This article presents a new design structure antenna and miniaturization techniques. The resonance frequency, the total gain is observed at 915 MHz, 2.3 dB respectively. This letter illustrates the mechanism of miniaturization and key dimension parameter analysis. An optimized design with 50% size reduction was fabricated and measured, where very good agreement between simulation and measurement was obtained.

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Terahertz conductivity studies in carbon nanotube networks prepared by the vacuum filtration method

Cited by 7 publications

References 0 publications

Sub‐THz characterisation of multi‐walled carbon nanotube thin films using vector network analyser

Sub‐THz characterisation of multi‐walled carbon nanotube thin films using vector network analyser

Determination of the DC Electrical Conductivity of Multiwalled Carbon Nanotube Films and Graphene Layers from Noncontact Time-Domain Terahertz Measurements

Optical properties of carbon nanotube thin films in subterahertz frequency regime

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