Abstract
Optoelectronically active viscous liquids are ideal for fabricating foldable/stretchable electronics owing to their excellent deformability and predictable π-unit–based optoelectronic functions, which are independent of the device shape and geometry. Here we show, unprecedented ‘liquid electret’ devices that exhibit mechanoelectrical and electroacoustic functions, as well as stretchability, have been prepared using solvent-free liquid porphyrins. The fluidic nature of the free-base alkylated-tetraphenylporphyrins was controlled by attaching flexible and bulky branched alkyl chains at different positions. Furthermore, a subtle porphyrin ring distortion that originated from the bulkiness of alkyl chains was observed. Its consequences on the electronic perturbation of the porphyrin-unit were precisely elucidated by spectroscopic techniques and theoretical modelling. This molecular design allows shielding of the porphyrin unit by insulating alkyl chains, which facilitates its corona-charged state for a long period under ambient conditions.
Highlights
Active viscous liquids are ideal for fabricating foldable/stretchable electronics owing to their excellent deformability and predictable π-unit–based optoelectronic functions, which are independent of the device shape and geometry
A novel strategy involving the use of a shielded π-unit of liquid porphyrins with trapped charge as an unprecedented ‘liquidelectret’ has been reported
The fluidic nature of these liquids provided sufficient deformability that can be granted for device stretchability
Summary
Active viscous liquids are ideal for fabricating foldable/stretchable electronics owing to their excellent deformability and predictable π-unit–based optoelectronic functions, which are independent of the device shape and geometry. Its consequences on the electronic perturbation of the porphyrin-unit were precisely elucidated by spectroscopic techniques and theoretical modelling This molecular design allows shielding of the porphyrin unit by insulating alkyl chains, which facilitates its corona-charged state for a long period under ambient conditions. The present strategy of creating a liquid-electret material involves shielding of a π-conjugate molecular unit with insulating and flexible bulky-alkyl chains[14], wherein porphyrin was chosen as the charge-storing π-unit. Because of attaching highly bulky and flexible alkyl chain moieties, a subtle porphyrin ring distortion was observed The impact of this distortion on the electronic perturbations have been investigated in detail. As a proof-ofconcept, the shielded π-units of porphyrin and their inherent liquid nature were considered together and revealed unconventional liquid-electret-based flexible and stretchable mechanoelectrical devices, which are of practical importance for the development of wearable electret[20] and nanogenerator[21] applications
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