Artificial intelligent skins hold the potential to revolutionize artificial intelligence, health monitoring, soft robotics, biomedicine, flexible, and wearable electronics. Present artificial skins can be characterized into electronic skins (e-skins) that convert external stimuli into electrical signals and photonic skins (p-skins) that convert deformations into intuitive optical feedback. Merging both electronic and photonic functions in a single skin is highly desirable, but challenging and remains yet unexplored. We report herein a brand-new type of artificial intelligent skin, an optoelectronic skin (o-skin), which combines the advantages of both e-skins and p-skins in a single skin device based on one-dimensional photonic crystal-based hydrogels. Taking advantage of its anisotropic characteristics, the resulting o-skin can easily distinguish vector stimuli such as stress type and movement direction to meet the needs of multi-dimensional perception. Furthermore, the o-skin also demonstrates advanced functions such as full-color displays and intelligent response to the environment in the form of self-adaptive camouflage. This work represents a substantial advance in using the molecular engineering strategy to achieve artificial intelligent skins with multiple anisotropic responses that can be integrated on the skin of a soft body to endow superior functions, just like the natural organisms that inspire us.
References
1.
T.
Cheng
, Y. Z.
Zhang
, W.-Y.
Lai
, and W.
Huang
, “Stretchable thin-film electrodes for flexible electronics with high deformability and stretchability
,” Adv. Mater.
27
(22
), 3349
–3376
(2015
).2.
D. D.
Li
, W.-Y.
Lai
, Y.-Z.
Zhang
, and W.
Huang
, “Printable transparent conductive films for flexible electronics
,” Adv. Mater.
30
(10
), 1704738
(2018
).3.
L.
Gu
, H. F.
Shi
, L. F.
Bian
, M. X.
Gu
, K.
Ling
, X.
Wang
, H. L.
Ma
, S. Z.
Cai
, W. H.
Ning
, L. S.
Fu
, H.
Wang
, S.
Wang
, Y. R.
Gao
, W.
Yao
, F. W.
Huo
, Y. T.
Tao
, Z. F.
An
, X. G.
Liu
, and W.
Huang
, “Colour-tunable ultra-long organic phosphorescence of a single-component molecular crystal
,” Nat. Photonics
13
(6
), 406
–411
(2019
).4.
C. X.
Bao
, W. D.
Xu
, J.
Yang
, S.
Bai
, P. P.
Teng
, Y.
Yang
, J. P.
Wang
, N.
Zhao
, W. J.
Zhang
, W.
Huang
, and F.
Gao
, “Bidirectional optical signal transmission between two identical devices using perovskite diodes
,” Nat. Electron.
3
(3
), 156
–164
(2020
).5.
W.
Hui
, L. F.
Chao
, H.
Lu
, F.
Xia
, Q.
Wei
, Z. H.
Su
, T. T.
Niu
, L.
Tao
, B.
Du
, D. L.
Li
, Y.
Wang
, H.
Dong
, S. W.
Zuo
, B.
Li
, W.
Shi
, X. Q.
Ran
, P.
Li
, H.
Zhang
, Z. B.
Wu
, C. X.
Ran
, L.
Song
, G. C.
Xing
, X. Y.
Gao
, J.
Zhang
, Y. D.
Xia
, Y. H.
Chen
, and W.
Huang
, “Stabilizing black-phase formamidinium perovskite formation at room temperature and high humidity
,” Science
371
(6536
), 1359
–1364
(2021
).6.
Y.
Cao
, N. N.
Wang
, H.
Tian
, J. S.
Guo
, Y. Q.
Wei
, H.
Chen
, Y. F.
Miao
, W.
Zou
, K.
Pan
, Y. R.
He
, H.
Cao
, Y.
Ke
, M. M.
Xu
, Y.
Wang
, M.
Yang
, K.
Du
, Z. W.
Fu
, D. C.
Kong
, D. X.
Dai
, Y. Z.
Jin
, G. Q.
Li
, H.
Li
, Q. M.
Peng
, J. P.
Wang
, and W.
Huang
, “Perovskite light-emitting diodes based on spontaneously formed submicrometre-scale structures
,” Nature
562
(7726
), 249
–253
(2018
).7.
M.
Zhu
, Z.
Zhang
, Q. F.
Shi
, T.
He
, H.
Liu
, T.
Chen
, and C. K.
Lee
, “Haptic-feedback smart glove as a creative human–machine interface (HMI) for virtual/augmented reality applications
,” Sci. Adv.
6
(19
), eaaz8693
(2020
).8.
Z. Y.
Lei
and P. Y.
Wu
, “A supramolecular biomimetic skin combining a wide spectrum of mechanical properties and multiple sensory capabilities
,” Nat. Commun.
9
, 1134
(2018
).9.
M.
Khatib
, O.
Zohar
, W.
Saliba
, and H.
Haick
, “Multifunctional electronic skin empowered with damage mapping and autonomic acceleration of self‐healing in designated locations
,” Adv. Mater.
32
(17
), 2000246
(2020
).10.
R.
Dahiya
, “E-skin: From humanoids to humans
,” Proc. IEEE
107
(2
), 247
–252
(2019
).11.
I.
You
, B.
Kim
, J.
Park
, K.
Koh
, S.
Shin
, S.
Jung
, and U.
Jeong
, “Stretchable e-skin apexcardiogram sensor
,” Adv. Mater.
28
(30
), 6359
–6364
(2016
).12.
X.
Peng
, K.
Dong
, C. Y.
Ye
, Y.
Jiang
, S. Y.
Zhai
, R. W.
Cheng
, D.
Liu
, X. P.
Gao
, J.
Wang
, and Z. L.
Wang
, “A breathable, biodegradable, antibacterial, and self-powered electronic skin based on all-nanofiber triboelectric nanogenerators
,” Sci. Adv.
6
(26
), eaba9624
(2020
).13.
B.
Shih
, D.
Shah
, J.
Li
, T. G.
Thuruthel
, Y.-L.
Park
, F.
Iida
, Z.
Bao
, R.
Kramer-Bottiglio
, and M. T.
Tolley
, “Electronic skins and machine learning for intelligent soft robots
,” Sci. Robot.
5
(41
), eaaz9239
(2020
).14.
H. R.
Lee
, C. C.
Kim
, and J.-Y.
Sun
, “Stretchable ionics—A promising candidate for upcoming wearable devices
,” Adv. Mater.
30
(42
), 1704403
(2018
).15.
C.
Yang
and Z. G.
Suo
, “Hydrogel ionotronics
,” Nat. Rev. Mater.
3
(6
), 125
–142
(2018
).16.
M. A.
Darabi
, A.
Khosrozadeh
, R.
Mbeleck
, Y. Q.
Liu
, Q.
Chang
, J. Z.
Jiang
, J.
Cai
, Q.
Wang
, G. X.
Luo
, and M.
Xing
, “Skin-inspired multifunctional autonomic-intrinsic conductive self-healing hydrogels with pressure sensitivity, stretchability, and 3D printability
,” Adv. Mater.
29
(31
), 1700533
(2017
).17.
Y.
Jin
, Y. L.
Lin
, A. D.
Kiani
, I.
Joshipura
, M. Q. D.
Ge
, and M.
Dickeye
, “Materials tactile logic via innervated soft thermochromic elastomers
,” Nat. Commun.
10
, 4187
(2019
).18.
B.
Zuo
, M.
Wang
, B. P.
Lin
, and H.
Yang
, “Visible and infrared three-wavelength modulated multi-directional actuators
,” Nat. Commun.
10
, 4539
(2019
).19.
H. S.
Kang
, S. W.
Han
, C.
Park
, S. W.
Lee
, H.
Eoh
, J.
Baek
, D.-G.
Shin
, T. H.
Park
, J.
Huh
, H.
Lee
, D-. E.
Kim
, D. Y.
Ryu
, E. L.
Thomas
, W.-G.
Koh
, and C.
Park
, “3D touchless multiorder reflection structural color sensing display
,” Sci. Adv.
6
(30
), eabb5769
(2020
).20.
M. L.
Hammock
, A.
Chortos
, B. C.
Tee
, J. B.
Tok
, and Z. N.
Bao
, “25th anniversary article: The evolution of electronic skin (e-skin): A brief history, design considerations, and recent progress
,” Adv. Mater.
25
(2
), 5997
–6038
(2013
).21.
C.
Wong
, B.
Lo
, and G.-Z.
Yang
, “Wearable sensing for solid biomechanics: A review
,” IEEE Sens. J.
15
(5
), 2747
–2760
(2015
).22.
M.
Clementine
, M. N.
Boutry
, J.
Mikael
, V.
Orestis
, C.
Alex
, K.
Oussama
, and Z. N.
Bao
, “A hierarchically patterned, bioinspired e-skin able to detect the direction of applied pressure for robotics
,” Sci. Robot.
3
(24
), eaau6914
(2018
).23.
J.
Ramon-Azcon
, S.
Ahadian
, M.
Estili
, X. B.
Liang
, S.
Ostrovidov
, H.
Kaji
, H.
Shiku
, M.
Ramalingam
, K.
Nakajima
, Y.
Sakka
, A.
Khademhosseini
, and T.
Matsue
, “Dielectrophoretically aligned carbon nanotubes to control electrical and mechanical properties of hydrogels to fabricate contractile muscle myofibers
,” Adv. Mater.
25
(29
), 4028
–4034
(2013
).24.
M. J.
Liu
, Y.
Ishida
, Y.
Ebina
, T.
Sasaki
, T.
Hikima
, M.
Takata
, and T.
Aida
, “An anisotropic hydrogel with electrostatic repulsion between cofacially aligned nanosheets
,” Nature
517
(7532
), 68
–72
(2015
).25.
W.
Kong
, C.
Wang
, C.
Jia
, Y.
Kuang
, G.
Pastel
, C.
Chen
, G. G.
Chen
, S. M.
He
, H.
Huang
, J. H.
Zhang
, S.
Wang
, and L. B.
Hu
, “Muscle-inspired highly anisotropic, strong, ion-conductive hydrogels
,” Adv. Mater.
30
(39
), 1801934
(2018
).26.
H.
Arslan
, A.
Nojoomi
, J.
Jeon
, and K.
Yum
, “3D printing of anisotropic hydrogels with bioinspired motion
,” Adv. Sci.
6
(2
), 1800703
(2019
).27.
O.
Kose
, A.
Tran
, L.
Lewis
, W. Y.
Hamad
, and M. J.
MacLachlan
, “Unwinding a spiral of cellulose nanocrystals for stimuli-responsive stretchable optics
,” Nat. Commun.
10
, 510
(2019
).28.
M.
Qin
, M.
Sun
, R.
Bai
, Y.
Mao
, X.
Qian
, D.
Sikka
, and X.
He
, “Bioinspired hydrogel interferometer for adaptive coloration and chemical sensing
,” Adv. Mater.
30
(21
), 1800468
(2018
).29.
J.
Niu
, D.
Wang
, H. L.
Qin
, X.
Xiong
, P. L.
Tan
, Y. Y.
Li
, R.
Liu
, X. X.
Lu
, J.
Wu
, T.
Zhang
, W. H.
Ni
, and J.
Jin
, “Novel polymer-free iridescent lamellar hydrogel for two-dimensional confined growth of ultrathin gold membranes
,” Nat. Commun.
5
, 3313
(2014
).30.
K.
Sano
, Y.
Ishida
, and T.
Aida
, “Synthesis of anisotropic hydrogels and their applications
,” Angew. Chem. Int. Ed.
57
(10
), 2532
–2543
(2018
).31.
C. H.
Zhang
, H. Y.
Dong
, C.
Zhang
, Y. Q.
Fan
, J. N.
Yao
, and Y. S.
Zhao
, “Photonic skins based on flexible organic microlaser arrays
,” Sci. Adv.
7
(31
), eabh3530
(2021
).32.
F. F.
Fu
, L. R.
Shang
, Z. Y.
Chen
, Y. R.
Yu
, and Y. J.
Zhao
, “Bioinspired living structural color hydrogels
,” Sci. Robot.
3
(16
), eaar8580
(2018
).33.
Y.
Wang
, Y. R.
Yu
, J. H.
Guo
, Z. H.
Zhang
, X. X.
Zhang
, and Y. J.
Zhao
, “Bio-inspired stretchable, adhesive, and conductive structural color film for visually flexible electronics
,” Adv. Funct. Mater.
30
(32
), 2000151
(2020
).34.
Y.
Wang
, L. R.
Shang
, G. P.
Chen
, L. Y.
Sun
, X. X.
Zhang
, and Y. J.
Zhao
, “Bioinspired structural color patch with anisotropic surface adhesion
,” Sci. Adv.
6
(4
), eaax8258
(2020
).35.
K.
Zhong
, J. Q.
Li
, L. W.
Liu
, S. V.
Cleuvenbergen
, K.
Song
, and K.
Clays
, “Instantaneous, simple, and reversible revealing of invisible patterns encrypted in robust hollow sphere colloidal photonic crystals
,” Adv. Mater.
30
(25
), 1707246
(2018
).36.
M. A.
Haque
, G.
Kamita
, T.
Kurokawa
, K.
Tsujii
, and J. P.
Gong
, “Unidirectional alignment of lamellar bilayer in hydrogel: One-dimensional swelling, anisotropic modulus, and stress/strain tunable structural color
,” Adv. Mater.
22
(45
), 5110
–5114
(2010
).37.
Y. F.
Yue
, M. A.
Haque
, T.
Kurokawa
, T.
Nakajima
, and J. P.
Gong
, “Lamellar hydrogels with high toughness and ternary tunable photonic stop-band
,” Adv. Mater.
25
(22
), 3106
–3110
(2013
).38.
Y. F.
Yue
, T.
Kurokawa
, M. A.
Haque
, T.
Nakajima
, T.
Nonoyama
, X. F.
Li
, I.
Kajuwara
, and J. P.
Gong
, “Mechano-actuated ultrafast full-colour switching in layered photonic hydrogels
,” Nat. Commun.
5
, 4659
(2014
).39.
A.
Cirillo
, P.
Cirillo
, G.
De Maria
, C.
Natale
, and S.
Pirozzi
, “An artificial skin based on optoelectronic technology
,” Sens. Actuators A: Phys.
212
, 110
–122
(2014
).40.
H.-J.
Kim
, Y. X.
Jin
, S.
Achavananthadith
, R. Z.
Lin
, and J. S.
Ho
, “A wireless optoelectronic skin patch for light delivery and thermal monitoring
,” iScience
24
(11
), 103284
(2021
).41.
G.
Gang
, L.
Yao
, X. Y.
Qu
, W.
Zhao
, Y. F.
Ren
, W. J.
Wang
, W.
Huang
, and X. C.
Dong
, “Muscle-inspired self-healing hydrogels for strain and temperature sensor
,” ACS Nano
14
, 218
–228
(2020
).© 2022 Author(s). Published under an exclusive license by AIP Publishing.
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