A rapidly growing interest in wearable electronics has led to the development of stretchable and transparent heating films that can replace the conventional brittle and opaque heaters. Herein, we describe the rapid production of large-area, stretchable and transparent electrodes using electrospun ultra-long metal nanofibers (mNFs) and demonstrate their potential use as wirelessly operated wearable heaters. These mNF networks provide excellent optoelectronic properties (sheet resistance of ~ 1.3 Ω per sq with an optical transmittance of ~ 90%) and mechanical reliability (90% stretchability). The optoelectronic properties can be controlled by adjusting the area fraction of the mNF networks, which also enables the modulation of the power consumption of the heater. For example, the low sheet resistance of the heater presents an outstanding power efficiency of 0.65 W cm− 2 (with the temperature reaching 250 °C at a low DC voltage of 4.5 V), which is ~ 10 times better than the properties of conventional indium tin oxide-based heaters. Furthermore, we demonstrate the wireless fine control of the temperature of the heating film using Bluetooth smart devices, which suggests substantial promise for the application of this heating film in next-generation wearable electronics.
|Journal||NPG Asia Materials|
|Publication status||Published - 2017|
Bibliographical noteFunding Information:
This work was supported by the Ministry of Science, ICT & Future Planning and the Ministry of Trade, Industry and Energy (MOTIE) of Korea through the National Research Foundation (2016R1A2B3013592 and 2016R1A5A1009926), the Nano Material Technology Development Program (2015M3A7B4050308 and 2016M3A7B4910635), the Convergence Technology Development Program for Bionic Arm (NRF-2014M3C1B2048198), and the Pioneer Research Center Program (NRF-2014M3C1A3001208). Additionally, the authors gratefully received financial support through the Development Program of Manufacturing Technology for Flexible Electronics with High Performance (SC0970) funded by the Korea Institute of Machinery and Materials, and through the Development Program of Internet of Nature System (1.150090.01) funded by UNIST. JJ and BGH designed and performed the experiment, fabricated the devices and analyzed the data. SJ and EC contributed to the sample preparation and data analysis. BWA and WHC designed the wireless control circuit and conducted the wireless operation experiments. J-UP oversaw all research phases and revised the manuscript. All authors discussed and commented on the manuscript.
© The Author(s) 2017.
All Science Journal Classification (ASJC) codes
- Modelling and Simulation
- Materials Science(all)
- Condensed Matter Physics