Large-area, flexible, and conductive porous film of interlinked carbon nanospheres for UV light filter and resistive heater
Abstract
Conductive and flexible thin film is promising for wearable electronic devices, and is challenging in fabrication due to its multiple requirements on structural and functional integration. Here, we present a chemical method for the preparation of large-area carbon film by in situ linking uniform carbon nanospheres that derived from stiff-shell polymeric crystals. The proof-of-concept interlinked carbon film features a dual-porous structure, consisting of the intrinsic micropores within the nodes of carbon spheres and the in-plane macropores within the interlinked carbon spheres patterned in mono-/few layer. The success in preparation of such interlinked carbon film relies on the unique combination of the liquid-solid configuration of polymeric stiff-shell and soft core, which induce a series of dynamic transformation from phase expansion, fusion, linking, and eventually form large-area interlinked porous carbon nanospheres patterned in one layer. Such thin carbon films can be transferred onto various rigid or flexible substrates, and perform well as light filter that can block > 90% UV light, as electrical-heating material that delivered a heating efficiency up to 45.8 oC/μm. This work provides a smart engineering platform and benefit the design of future electronic skin and intelligent wearable devices.
