Carbon nanotube, the smallest nanoelectronic materials, has been extensively used as electric materials for chip-scale electronics due to their high electronics conductivity, desirable mechanical properties, and easy surface functionalization. Also the conductive polymer, well-known for its high work function, real-time responsiveness, easy film-formation ability and stretchability. Herein, we combine the carbon nanotube-doped hydrophilic materials with conductive polymer via two-photon hydrogelation for conductivity-tunable functional devices. Taking advantage non-covalent π-π effect, we interpenetrated π-conjugated poly (3,4-ethylenedioxythiophene) into multiwall carbon nanotube-embedded mesoscopic hydrogels, which sustains electronic conductivity, hydrogel-like mechanical properties and desirable tolerance to humid/acid environments. Some reliable, nanostructured, metal-free electronic circuits and interdigital capacitors were fabricated and identified. Carbon nanotube-doped electric hydrogels successfully breaks current limitations by making better use of two photon hydrogelation and intermolecular force with conductive polymer. Moreover, a fast-speed two-photon fluorescence imaging technique using same optical system was deployed to detect the distribution of conductive polymer around electric patterns. Keywords: multi-wall carbon nanotube, conductive polymer, two-photon hydrogelation, mesoscopic electric hydrogels.
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