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Small. 2017 Nov;13(44). doi: 10.1002/smll.201702645. Epub 2017 Sep 29.

Ultrathin, Washable, and Large-Area Graphene Papers for Personal Thermal Management.

Author information

1
State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai, 201620, P. R. China.
2
Center for Nanotechnology and Molecular Materials, Department of Physics, Wake Forest University, Winston-Salem, NC, 27109, USA.
3
Department of Physics, Wake Forest University, Winston-Salem, NC, 27109, USA.
4
Fashion Art Design Institute, Donghua University, Shanghai, 200051, P. R. China.
5
College of Textiles, North Carolina State University, Raleigh, NC, 27695, USA.

Abstract

Freestanding, flexible/foldable, and wearable bifuctional ultrathin graphene paper for heating and cooling is fabricated as an active material in personal thermal management (PTM). The promising electrical conductivity grants the superior Joule heating for extra warmth of 42 °C using a low supply voltage around 3.2 V. Besides, based on its high out-of-plane thermal conductivity, the graphene paper provides passive cooling via thermal transmission from the human body to the environment within 7 s. The cooling effect of graphene paper is superior compared with that of the normal cotton fiber, and this advantage will become more prominent with the increased thickness difference. The present bifunctional graphene paper possesses high durability against bending cycles over 500 times and wash time over 1500 min, suggesting its great potential in wearable PTM.

KEYWORDS:

blade-coating; graphene papers; personal thermal management; thermal conductivity; wearable

PMID:
28961386
DOI:
10.1002/smll.201702645

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