Thermal conductivity measurement of few layer graphene film by a micropipette sensor with laser point heating source

Jeong, Jae Young; Lee, K M; Shrestha, Ramesh; Horne, Kyle; Das, Santanu; Choi, Wonbong; Kim, M; Choi, Tae-Youl

doi:10.1088/2053-1591/3/5/055004

Cited by 11 publications

(5 citation statements)

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“…The utilized FLG was sourced from a novel dry physical grinding technique followed by graphene nanoflakes liberation using plasma treatment and intercalation with dielectric barrier discharge (DBD) utilizing both atmospheric and vacuum process. Most importantly, our synthesized FLG possessed significantly lower κ compared to other values reported for FLG, , which makes it suitable for thermoelectric applications. In addition, HB pencil traces comprise nanocomposites of graphite nanoparticles and multilayer sheets of graphene and clay .…”

Section: Introductionmentioning

confidence: 99%

Paper Thermoelectrics by a Solvent-Free Drawing Method of All Carbon-Based Materials

et al. 2021

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As practical interest in the flexible or wearable thermoelectric generators (TEGs) has increased, the demand for the high-performance TEGs based on ecofriendly, mechanically resilient, and economically viable TEGs as alternatives to the brittle inorganic materials is growing. Organic or hybrid thermoelectric (TE) materials have been employed in flexible TEGs; however, their fabrication is normally carried out using wet processing such as spin-coating or screen printing. These techniques require materials dissolved or dispersed in solvents; thus, they limit the substrate choice. Herein, we have rationally designed solvent-free, all carbon-based TEGs dry-drawn on a regular office paper using few-layered graphene (FLG). This technique showed very good TE parameters, yielding a power factor of 97 μW m–1 K–2 at low temperatures. The p-type only device exhibited an output power of up to ∼19.48 nW. As a proof of concept, all carbon-based p-n TEGs were created on paper with the addition of HB pencil traces. The HB pencil exhibited low Seebeck coefficients (−7 μV K–1), and the traces were highly resistive compared to FLG traces, which resulted in significantly lower output power compared to the p-type only TEG. The demonstration of all carbon-based TEGs drawn on paper highlights the potential for future low-cost, flexible, and almost instantaneously created TEGs for low-power applications.

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Section: Introductionmentioning

confidence: 99%

Paper Thermoelectrics by a Solvent-Free Drawing Method of All Carbon-Based Materials

et al. 2021

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“…Several interesting results have been obtained in the field of thermal transport in few-layer graphene (FLG) during the last few years. [91,[96][97][98][99][100][101][102][103][104][105][106][107][108][109][110] A series of independent measurements of thermal conductivity in FLG has been performed. [91,[96][97][98] Ghosh et al [91] reported on the measurements of thicknessdependent thermal conductivity in FLG.…”

Section: Thermal Transport In Few-layer Graphenementioning

confidence: 99%

“…[91,[96][97][98][99][100][101][102][103][104][105][106][107][108][109][110] A series of independent measurements of thermal conductivity in FLG has been performed. [91,[96][97][98] Ghosh et al [91] reported on the measurements of thicknessdependent thermal conductivity in FLG. Rapid decrease of TC with increase of number of layers from 1 up to 4 was observed and explained theoretically by increase in phase space allowed for three-phonon Umklapp scattering.…”

Section: Thermal Transport In Few-layer Graphenementioning

confidence: 99%

“…The drop of TC was explained by emergence of many additional hybrid folded phonons in T-BLG, resulting in more intensive phonon scattering. [60,[102][103][104] Jeong et al [97] reported the TC of 2868 ± 932 W/m•K at RT for CVD large-scale freestanding FLG in which a micropipette temperature sensor with an inbuilt laser point heating source was used. The large uncertainty of 32% in TC measurement was attributed mainly to the non-uniform thickness of the film in the range 1-10 layers with an average thickness around 7 layers.…”

Section: Thermal Transport In Few-layer Graphenementioning

confidence: 99%

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Thermal transport in semiconductor nanostructures, graphene, and related two-dimensional materials

2018

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We review experimental and theoretical results on thermal transport in semiconductor nanostructures (multilayer thin films, core/shell and segmented nanowires), single-and few-layer graphene, hexagonal boron nitride, molybdenum disulfide and black phosphorus. Different possibilities of phonon engineering for optimization of electrical and heat conductions are discussed. The role of the phonon energy spectra modification on the thermal conductivity in semiconductor nanostructures is revealed. The dependence of thermal conductivity in graphene and related two-dimensional (2D) materials on temperature, flake size, defect concentration, edge roughness and strain is analyzed. PACS: 63.22.Rc, 63.22-m, 65.80.Ck, 65.80.-g 1 Corresponding author (DLN): dlnika@yahoo.com 2 Thermal transport in semiconductor nanostructuresRapid miniaturization of electronic devices to nanoscale range requires new approaches for efficient management of their heat and electrical conductions. One of these approaches, referred to as phonon engineering [1], is related to optimization of thermal and electronic properties of nanodimensional structures due to modification of their phonon properties [1][2][3]. At the end of the previous century several research groups have demonstrated that many phonon confined branches appear in energy spectra of homogeneous semiconductor thin films and nanowires [4][5][6][7][8][9], leading to change in phonon density of states and reduction of average phonon group velocity in comparison with corresponding bulk materials [7][8][9]. The latter together with enhanced phonon boundary scattering results in decreasing of lattice thermal conductivity (TC). Balandin and Wang [7] have theoretically predicted that lattice thermal conductivity of 10-nm-wide silicon film is by an order of magnitude smaller than that in bulk silicon at room temperature (RT). Fivetimes drop of lattice thermal conductivity was also theoretically predicted for Si nanowire with a diameter of 20 nm [10]. Subsequent independent theoretical studies [11][12][13][14][15][16][17] and experimental measurements of thermal conductivity in several nm-thick free-standing Si films and nanowires [18][19][20][21] confirmed the initial predictions: strong reduction of lattice thermal conductivity as compared with bulk material was revealed.More precise tuning of phonon properties and heat conduction at nanoscale can be realized in multilayer films (MFs) and core/shell nanowires (NWs) [22][23][24][25][26][27][28][29][30][31][32][33]. The evolution of phonon energies in homogeneous silicon films and silicon films covered by diamond claddings is illustrated in Figure 1, where we show the dispersion relations for the dilatation (SA) phonon modes in the freestanding Si film (a); Diamond/Si/Diamond heterostructures with the different thickness of the diamond (D) barrier layer (b-c); and Si film with the clamped external surfaces (d), which correspond to a film embedded in the "absolutely" rigid material. The thickness of the Si layer in all cases is 2 nm to insure the ...

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“…For example, recently Ramos et al and Bonaldi et al have, respectively, developed silicon nitride membrane resonators to probe optomechanical characterization of nanoscale microdrum resonators, which further indicates the advantage of optomechanical detection and actuation [19,20]. Furthermore, the availability of graphene acting as an excellent material with extraordinary opto-electronic properties and extremely high thermal conductivity [21,22,23,24] can provide the possibility of exploring the ability to absorb the light for optoelectronics application, along with the benefit of the ease of being optically tunable in intensity and frequency [25,26]. For example, in 2008, Ghosh et al measured the thermal conductivity of graphene suspended across on Si/SiO 2 wafer actuated by a laser with a wavelength of 488 nm, therefore suggesting graphene’s application as thermal management material in nanoelectromechanical system (NEMS) [27].…”

Section: Introductionmentioning

confidence: 99%

Opto-thermally Excited Fabry-Perot Resonance Frequency Behaviors of Clamped Circular Graphene Membrane

Shi

Fan

et al. 2019

Nanomaterials

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An opto-thermally excited optical fiber Fabry-Perot (F-P) resonant probe with suspended clamped circular graphene diaphragm is presented in this paper. Then, the dependence of resonance frequency behaviors of graphene diaphragm upon opto-mechanical factors including membrane properties, laser excitation parameters and film boundary conditions are investigated via COMSOL Multiphysics simulation. The results show that the radius and thickness of membrane will linearly affect the optical fiber light-induced temperature distribution, thus resulting in rapidly decreasing resonance frequency changes with the radius-to-thickness ratio. Moreover, the prestress can be regulated in the range of 108 Pa to 109 Pa by altering the environmental temperature with a scale factor of 14.2 MPa/K. It is important to note that the availability of F-P resonant probe with a defective clamped circular graphene membrane can be improved notably by fabricating the defected circular membrane to a double-end clamped beam, which gives a broader perspective to characterize the resonance performance of opto-thermally excited F-P resonators.

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Thermal conductivity measurement of few layer graphene film by a micropipette sensor with laser point heating source

Cited by 11 publications

References 28 publications

Paper Thermoelectrics by a Solvent-Free Drawing Method of All Carbon-Based Materials

Paper Thermoelectrics by a Solvent-Free Drawing Method of All Carbon-Based Materials

Thermal transport in semiconductor nanostructures, graphene, and related two-dimensional materials

Opto-thermally Excited Fabry-Perot Resonance Frequency Behaviors of Clamped Circular Graphene Membrane

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