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ACS Nano. 2017 Jun 27;11(6):5318-5324. doi: 10.1021/acsnano.7b00370. Epub 2017 Feb 21.

Smart Contact Lenses with Graphene Coating for Electromagnetic Interference Shielding and Dehydration Protection.

Author information

1
Graphene Research Center, Advanced Institute of Convergence Technology & Department of Chemistry, Seoul National University , Gwanakro-1, Seoul 08826, Republic of Korea.
2
Materials & Production Engineering Research Institute, LG Electronics , LGro-222, Pyeongtaek 451-713, Republic of Korea.
3
Advanced Nano-Surface Research Group, Korea Basic Science Institute , 169-148 Gwahak-ro, Yuseong-gu, Daejeon 34133, Republic of Korea.
4
Interojo, Inc., 28 & 25 Sandan-ro 15, Pyeongtaek 17744, Republic of Korea.
5
Graphene Square, Inc., Inter-University Semiconductor Research Center, 1 Gwanak-ro, Seoul 08826, Republic of Korea.

Abstract

Recently, smart contact lenses with electronic circuits have been proposed for various sensor and display applications where the use of flexible and biologically stable electrode materials is essential. Graphene is an atomically thin carbon material with a two-dimensional hexagonal lattice that shows outstanding electrical and mechanical properties as well as excellent biocompatibility. In addition, graphene is capable of protecting eyes from electromagnectic (EM) waves that may cause eye diseases such as cataracts. Here, we report a graphene-based highly conducting contact lens platform that reduces the exposure to EM waves and dehydration. The sheet resistance of the graphene on the contact lens is as low as 593 Ω/sq (±9.3%), which persists in an wet environment. The EM wave shielding function of the graphene-coated contact lens was tested on egg whites exposed to strong EM waves inside a microwave oven. The results show that the EM energy is absorbed by graphene and dissipated in the form of thermal radiation so that the damage on the egg whites can be minimized. We also demonstrated the enhanced dehydration protection effect of the graphene-coated lens by monitoring the change in water evaporation rate from the vial capped with the contact lens. Thus, we believe that the graphene-coated contact lens would provide a healthcare and bionic platform for wearable technologies in the future.

KEYWORDS:

graphene EMI shielding; graphene WVTR; graphene contact lens; graphene heat; graphene moisturizing

PMID:
28199121
DOI:
10.1021/acsnano.7b00370

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