Improving Terahertz Sheet Conductivity of Graphene Films Synthesized by Atmospheric Pressure Chemical Vapor Deposition with Acetylene

Qi, Mei; Zhou, Yixuan; Hu, Fangrong; Xu, Xinlong; Li, Weilong; Li, Anran; Bai, Jintao; Ren, Zhaoyu

doi:10.1021/jp502260k

Cited by 20 publications

(17 citation statements)

References 36 publications

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“…1000% for MLG850, 715% for MLG900, 705% for MLG1000, and 1150% for MLG1000PE. A similar high increase is explained by an increase in hole carrier concentration in a study by Qi et al [25]. Besides the doping effect, graphene thickness can also affect the conductivity significantly.…”

Section: Resultssupporting

confidence: 65%

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Multilayer Graphene Broadband Terahertz Modulators with Flexible Substrate

Kaya

Kakenov

Altan

et al. 2018

J Infrared Milli Terahz Waves

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Fabrication of terahertz modulators as simple devices with high modulation depth across a broad bandwidth is still very challenging. In this study, four different chemical vapor deposition grown multilayer graphene (MLG) modulators based on MLG/ionic liquid/gold sandwich structures have been investigated. Flexible substrates (PVC and PE) were chosen as host materials, and devices were fabricated with three different thicknesses. The resultant MLG devices can be operated at low voltages between 0 and 3.4 V providing nearly complete modulation between 0.2 and 1.5 THz with low insertion losses. Even with such low gate voltages, the devices have been doped significantly inducing 7-11-fold improvement in their sheet conductivities depending on device thickness. In addition, sheet conductivity has been improved more than three times as the graphene layer number increased from 30 to 100. With the demonstration of promising device performances, the proposed modulators can be potential candidates for applications in terahertz and related optoelectronic technologies.

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Section: Resultssupporting

confidence: 65%

“…2a) was observed. All changes observed in conductivity are expected to result from a change in carrier density and/or change in scattering time [25]. Therefore, terahertz sheet conductivities (σ sh ) of MLG devices are proportional to the amplitude ratio of reference (PVC or PE) substrate to MLG sample as given in Eq.…”

Section: Methodsmentioning

confidence: 99%

Multilayer Graphene Broadband Terahertz Modulators with Flexible Substrate

Kaya

Kakenov

Altan

et al. 2018

J Infrared Milli Terahz Waves

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“…Growing under the temperature of 850°C, a five-layer graphene film can be obtained [18]. After removing the copper foil by FeNO 3 3 solution, and rinsing in deionized water several times, graphene was transferred onto TFBG directly [19].…”

mentioning

confidence: 99%

Graphene-coated tilted fiber-Bragg grating for enhanced sensing in low-refractive-index region

Jiang

Gan

et al. 2015

Opt. Lett.

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We propose and experimentally demonstrate a method to significantly extend the sensitive window of tilted fiber-Bragg grating (TFBG) into low-refractive-index region with the integration of graphene coating. The coupling between cladding modes of TFBG and graphene coating results in an obvious modification of the cladding-mode envelope, which provides a sensitive regime relying on graphene's complex refractive index. Interacting the graphene-coated TFBG with various aqueous solutions, we observe strongly enhanced sensitivity in the low-refractive-index region of 1-1.428, which is about 10-fold extended from that of the unloaded TFBG. The graphene-coated TFBGs present great potentials in the biochemical sensing window.

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“…7. The intensity ratio can be used to calculate the defects or in-plane crystallite size, calculated according to the Tuinstra-Koenig (TK) relation [47].…”

Section: Meshingmentioning

confidence: 99%

Numerical study of the electrochemical exfoliation of graphite

Muhsan

Lafdi

2019

SN Appl. Sci.

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In this study, graphene was prepared using electrochemical exfoliation method. Numerical study of the exfoliation process of graphite was carried out using COMSEL Multiphysics 5. The homemade graphene was characterized using various microscopy, spectroscopy and X-ray diffraction techniques. The prepared graphene oxide consists of few layers of graphene. The numerical study showed that the concentration of sulfate anions was transported through graphite rod in the range (9.77 × 10 −7 -4.58 × 10 −5 ) mol/m 3 and stresses distribution which resulted from sulfate anions interaction along the graphite rod in the range (3.43 × 10 −8 -5.77 × 10 −7 ) N/m 2 .

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Improving Terahertz Sheet Conductivity of Graphene Films Synthesized by Atmospheric Pressure Chemical Vapor Deposition with Acetylene

Cited by 20 publications

References 36 publications

Multilayer Graphene Broadband Terahertz Modulators with Flexible Substrate

Multilayer Graphene Broadband Terahertz Modulators with Flexible Substrate

Graphene-coated tilted fiber-Bragg grating for enhanced sensing in low-refractive-index region

Numerical study of the electrochemical exfoliation of graphite

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