Fine Art of Thermoelectricity

Брус, В. В.; Gluba, Marc A.; Rappich, Jörg; Lang, Felix; Maryanchuk, P. D.; Nickel, N. H.

doi:10.1021/acsami.7b17491

Cited by 31 publications

(30 citation statements)

References 42 publications

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“…Higher thermal sensitivities of about 35-40 lV K À1 have been reported in graphene based devices [1,15]. Similar improvements in the sensitivity can be expected from the present graphite based devices through the use of proper dopants [19]. In conclusion, the present study shows that these simple graphite trace patterns can convert a piece of paper into a thermal mapping device.…”

Section: Validation and Characterisationsupporting

confidence: 84%

Sensors-on-paper: Fabrication of graphite thermal sensor arrays on cellulose paper for large area temperature mapping

Mulla¹,

Dunnill²

2022

HardwareX

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Section: Validation and Characterisationsupporting

confidence: 84%

Sensors-on-paper: Fabrication of graphite thermal sensor arrays on cellulose paper for large area temperature mapping

Mulla¹,

Dunnill²

2022

HardwareX

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“…59 Our devices yielded reasonably higher output power up to the temperature gradient of 50 K, which is higher than most organic TEGs reported to date, as shown in Figure 5. [60][61][62][63][64][65][66][67][68][69][70] However, for the practical application of FLG nano-flakes based bulk material, device performance is desired to be improved. Such as, by optimizing the device structure (e.g.…”

Section: Performance Evaluation Of Flg Nano-flakes Based Tegsmentioning

confidence: 99%

Lightweight and Bulk Organic Thermoelectric Generators Employing Novel P-Type Few-Layered Graphene Nanoflakes

Rafique

Burton

Badiei

et al. 2020

ACS Appl. Mater. Interfaces

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Graphene exhibits both high electrical conductivity and large elastic modulus, which makes it an ideal material candidate for many electronic devices. At present not much work has been conducted on using graphene to construct thermoelectric devices, particularly due to its high thermal conductivity and lack of bulk fabrication. Films of graphene-based materials, however, and their nanocomposites have been shown to be promising candidates for thermoelectric energy generation. Exploring methods to enhance the thermoelectric performance of graphene and produce bulk samples can significantly widen its application in thermoelectrics. Realization of bulk organic materials in the thermoelectric community is highly desired to develop cheap, Earth-Abundant, light, and non-toxic thermoelectric generators. In this context, this work reports a new approach using pressed pellets bars of few layered graphene (FLG) nanoflakes employed in thermoelectric generators (TEGs). Firstly, FLG nano-flakes were produced by a novel dry physical grinding technique followed by graphene nano-flakes liberation using plasma treatment. The resultant material is highly pure with very low defects, possessing 3 to 5-layers stack as proved by Raman spectroscopy, X-ray diffraction measurement and scanning electron microscopy. The thermal and electronic properties confirm the anisotropy of the material and hence the varied performance characteristics parallel to and perpendicular to the pressing direction of the pellets. The full thermoelectric properties were characterized both parallel and perpendicular to the pressing direction, and the proof of concept thermoelectric generators were fabricated with variable amounts of legs.

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“…Мінімальні значення пропускання при 250 нм пояснюються розсіюванням світла на дефектах, які утворюються на границях зерен [13]. Електричні властивості тонких плівок графіту Результати вимірювання температурної залежності електричного опору досліджуваних тонких плівок графіту представлені на рисунку 4а показали, що опір зменшується при зростанні температури, що вказує на напівпровідниковий тип провідності.…”

Section: оптичні властивості тонких плівок графітуunclassified

Optical and Electrical Properties of Graphite Thin Films Prepared by Different Methods

Solovan

Yamrozyk

Brus

et al. 2020

EEJP

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The paper reports on the structural, optical and electrical properties of graphite thin films prepared by two methods: the vacuum-free method "Pencil-on-semiconductor" and via the electron beam evaporation. Graphite thin films prepared by the non-vacuum method has annealed at a temperature of 920K.The transmission spectra of the investigated graphite films and the electrical properties of these thin films were measured at T = 300 K. The value of the height of barriers Eb at the grain boundaries and the temperature dependence of the electrical conductivity in the range ln(σ·T1/2) = f(103/T) were determined, It is established that the height of the barrier at the grain boundaries for the drawn graphite films is Eb = 0.03 eV, for annealed Eb = 0.01 eV and for the graphite films deposited by the electron beam evaporation Eb = 0.04 eV, ie for annealed film the barrier height is the smallest. It is shown that graphite films deposited by the electron beam evaporation reveals the highest transmittance (T550 ≈ 60%), and the transmission of drawn films is the lowest, annealing leads to its increase. The minimum values of transmission at a wavelength λ = 250nm are due to the scattering of light at the defects that are formed at the grain boundaries. Annealed graphite films have been found to possess the best structural perfection because they have the lowest resistivity compared to non-annealed films and electron-beam films and have the lowest barrier height. Simultaneous increase of transmission in the whole spectral range, increase of specific electrical conductivity and decrease of potential barrier at grain boundaries of the annealed drawn graphite film clearly indicate ordering of drawn graphite flakes transferred onto anew substrate, which led to the reduction of light scattering and the improvement of charge transport due to the larger area of overlap between graphite flakes.

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Fine Art of Thermoelectricity

Cited by 31 publications

References 42 publications

Sensors-on-paper: Fabrication of graphite thermal sensor arrays on cellulose paper for large area temperature mapping

Sensors-on-paper: Fabrication of graphite thermal sensor arrays on cellulose paper for large area temperature mapping

Lightweight and Bulk Organic Thermoelectric Generators Employing Novel P-Type Few-Layered Graphene Nanoflakes

Optical and Electrical Properties of Graphite Thin Films Prepared by Different Methods

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