2, Korea Research Institute of Bioscience & Biotechnology (KRIBB), Daejeon, , Korea (the Republic of)
High-performance flexible transparent heaters are very useful for the anti-fogging, anti-icing and de-icing of optics and optoelectronic devices such as outdoor displays, light emitting diode (LED) automobile headlamps, windows, mirrors and camera lenses. Here, we report the uniformly interconnected metal (CuNi, CuMg, AgNi, Ni etc.) micromesh/nanomesh structures on various polymer substrates (Polyethersulfone (PES), Polyimide (PI), Polyethylene terephthalate (PET) etc.) which have been fabricated using room-temperature transfer printing method. These metal micromesh/nanomesh structures on diverse substrates showed effective and rapid heating performance at low input voltage (below DC 9V), and high long-term stability to oxidation, heat, and chemicals. Furthermore, the metal micromesh/nanomesh film heater exhibited high reliability for outer bending and electrical switching cycle test. These results demonstrate that the high-performance is attributed to the creation of a high quality network over the whole surface area and strong adhesion to its substrate. The heating performance of the flexible transparent film heater improved with Pt-decoration, and oxygen (O2) plasma and self-assembled monolayer (SAM) treatment. In addition, the convection phenomenon by our flexible film heater was investigated for the consistent and sensitive detection of target materials (particulate matter (PM) or gases). Therefore, the flexible transparent heater based on the metal micromesh/nanomesh is considered suitable operations as defogging/deicing systems for an automobile side-view mirror and camera lens, transparent heating block systems for polymerase chain reaction (PCR) devices, and particulate matter (PM) detecting systems for PM2.5 sensors.