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Visco‐Poroelastic Electrochemiluminescence Skin with Piezo‐Ionic Effect
Author(s) -
Lee Jong Ik,
Choi Hanbin,
Kong Seok Hwan,
Park Sangsik,
Park Dongmok,
Kim Joo Sung,
Kwon Sung Hyun,
Kim Jungwook,
Choi Soo Hyung,
Lee Seung Geol,
Kim Do Hwan,
Kang Moon Sung
Publication year - 2021
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.202100321
Subject(s) - materials science , electrochemiluminescence , luminophore , ionic bonding , nanotechnology , stress (linguistics) , fabrication , optoelectronics , electrode , composite material , ion , medicine , linguistics , chemistry , physics , philosophy , alternative medicine , quantum mechanics , pathology , luminescence
Following early research efforts devoted to achieving excellent sensitivity of electronic skins, recent design schemes for these devices have focused on strategies for transduction of spatially resolved sensing data into straightforward user‐adaptive visual signals. Here, a material platform capable of transducing mechanical stimuli into visual readout is presented. The material layer comprises a mixture of an ionic transition metal complex luminophore and an ionic liquid (capable of producing electrochemiluminescence (ECL)) within a thermoplastic polyurethane matrix. The proposed material platform shows visco‐poroelastic response to mechanical stress, which induces a change in the distribution of the ionic luminophore in the film, which is referred to as the piezo‐ionic effect. This piezo‐ionic effect is exploited to develop a simple device containing the composite layer sandwiched between two electrodes, which is termed “ECL skin”. Emission from the ECL skin is examined, which increases with the applied normal/tensile stress. Additionally, locally applied stress to the ECL skin is spatially resolved and visualized without the use of spatially distributed arrays of pressure sensors. The simple fabrication and unique operation of the demonstrated ECL skin are expected to provide new insights into the design of materials for human–machine interactive electronic skins.