Abstract
In this paper, CNTs@PANi nanocomposites were prepared by in-situ oxidation polymerization of aniline, and their structure, morphology and conductivity were characterized. A mixed solvent of toluene and tetrahydrofuran was used to prepare dispersions of CNTs@PANi and poly(styrene-ethylene-butylene-styrene) (SEBS) triblock copolymer, and bilayer composite film was prepared. According to the solvent phase separation and uneven evaporation flux, CNTs@PANi self-assembled into the interconnected coffee ring structure on the SEBS matrix. The prepared bilayer composite film had excellent stretchability, and the conductivity of the functional layer was close to that of CNTs@PANi, which could light up an LED lamp under 100% strain and restore the topological structure. Electrochemical tests showed that the bilayer film had obvious heterogeneity. The impedance characteristics of the CNTs@PANi functional layer and the SEBS matrix were analyzed, and its heterogeneous corrosion resistance mechanism further discussed.
Highlights
Stretchable electronic devices with sensitive responses have attracted great attention in various fields, such as wearable applications, electronic skins, flexible sensors, and supercapacitors [1,2,3,4].Building a conductive network in a soft matrix is a common method for preparing stretchable electrons [5], but the risk of aggregation usually threatens the effectiveness of the conductive network, and the sensitivity is often reduced according to the encapsulation status in the soft matrix
A mixed solvent was used to prepare dispersions of carbon nanotubes (CNTs)@PANi and SEBS triblock copolymer, and bilayer composite films were prepared by spin coating
CNTs@PANi conductive nanocomposites were prepared by in-situ oxidation polymerization of aniline
Summary
Stretchable electronic devices with sensitive responses have attracted great attention in various fields, such as wearable applications, electronic skins, flexible sensors, and supercapacitors [1,2,3,4]. Traditional conductive metals are difficult to use to form long-term stable conformal interfaces due to their high modulus and severe mechanical mismatch with many soft tissues [18] In this regard, various conductive functional materials have been extensively explored, including carbon nanotubes (CNTs) [19], conductive polymers [20], graphene [21], and metal nanowires [22]. The microphase separation of SEBS triblock copolymer helps to form compliant interfaces with various surface topologies, and can obtain soft–hard transition modulus during solvent evaporation. Driven by solvent phase separation and capillary evaporation, CNTs@PANi were assembled on the SEBS matrix into an interconnected coffee ring structure. Through impedance spectroscopy and Tafel polarization curve, the interface resistance of the CNTs@PANi functional layer and the SEBS matrix of the bilayer composite film were analyzed, and the heterogeneous electrochemical mechanism of the bilayer composite film was discussed
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