期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 27, 页码 30643-30651出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c06050
关键词
few-layered graphene; bulk thermoelectric generator; high output power; flexible substrate; organic
资金
- WEFO
- SPECIFIC Innovation and Knowledge Centre [EP/N020863/1]
- Welsh Government
- European Regional Development Fund (ERDF)
- SMART Expertise Wales
- COATED2 [EPSRC EP/L015099/1]
- EPSRC [EP/M028267/1, EP/N020863/1] Funding Source: UKRI
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 nontoxic 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). First, FLG nanoflakes were produced by a novel dry physical grinding technique followed by graphene nanoflake liberation using plasma treatment. The resultant material is highly pure with very low defects, possessing 3 to 5-layer stacks 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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