An ultrathin stretchable triboelectric nanogenerator with coplanar electrode for energy harvesting and gesture sensing

Stretchable electronics with excellent elastic characteristics are attracting extensive interest in the area of wearable devices and epidermal electronics. Here, we demonstrate an ultrathin stretchable triboelectric nanogenerator (s-TENG) with coplanar electrode for harvesting diverse biomechanical energies and acting as a self-powered gesture sensor. The s-TENG employs electrospun polyurethane nanofibers and conductive nanomaterials as the stretchable electrode. With the coplanar electrode configuration, the device can generate electricity from diverse working situations, such as folding/unfolding of the device and contact/separation with other objects. Facilitated by the increased contact area of nanostructure and paired electrodes design, the s-TENG can generate enhanced instantaneous peak power density of 316.4 μW cm−2 when working in the folding/unfolding situation. When in contact with other objects such as cotton cloth and human skin, peak voltages of 330 V and 286 V are obtained, respectively. Thanks to the ultrathin structure of the device, it can be conformally attached on skin and deforms as the body moves. By adjusting the dimensions of the device, the s-TENG can be used to detect human motion in different body parts, showing its great application prospects in sustainable wearable devices, self-powered electronic skins and smart wireless sensor networks.

[1]  Zhong Lin Wang,et al.  Highly Stretchable 2D Fabrics for Wearable Triboelectric Nanogenerator under Harsh Environments. , 2015, ACS nano.

[2]  Jürgen Brugger,et al.  A silk-fibroin-based transparent triboelectric generator suitable for autonomous sensor network , 2016 .

[3]  K. Hata,et al.  A stretchable carbon nanotube strain sensor for human-motion detection. , 2011, Nature nanotechnology.

[4]  M. Vosgueritchian,et al.  Stretchable Energy‐Harvesting Tactile Electronic Skin Capable of Differentiating Multiple Mechanical Stimuli Modes , 2014, Advanced materials.

[5]  Jie Wang,et al.  Stretchable and Waterproof Self-Charging Power System for Harvesting Energy from Diverse Deformation and Powering Wearable Electronics. , 2016, ACS nano.

[6]  Jie Wang,et al.  A highly shape-adaptive, stretchable design based on conductive liquid for energy harvesting and self-powered biomechanical monitoring , 2016, Science Advances.

[7]  Yu Song,et al.  Omnidirectional Bending and Pressure Sensor Based on Stretchable CNT‐PU Sponge , 2017 .

[8]  M. Willander,et al.  An Ultrathin Flexible Single‐Electrode Triboelectric‐Nanogenerator for Mechanical Energy Harvesting and Instantaneous Force Sensing , 2017 .

[9]  Seung Hwan Ko,et al.  A Hyper‐Stretchable Elastic‐Composite Energy Harvester , 2015, Advanced materials.

[10]  G. Cao,et al.  A Self‐Charging Power Unit by Integration of a Textile Triboelectric Nanogenerator and a Flexible Lithium‐Ion Battery for Wearable Electronics , 2015, Advanced materials.

[11]  Long Lin,et al.  Stretchable‐Rubber‐Based Triboelectric Nanogenerator and Its Application as Self‐Powered Body Motion Sensors , 2015 .

[12]  Guang Zhu,et al.  Triboelectric nanogenerators as a new energy technology: From fundamentals, devices, to applications , 2015 .

[13]  Long Lin,et al.  A Flexible, Stretchable and Shape‐Adaptive Approach for Versatile Energy Conversion and Self‐Powered Biomedical Monitoring , 2015, Advanced materials.

[14]  Haixia Zhang,et al.  Controlled fabrication of nanoscale wrinkle structure by fluorocarbon plasma for highly transparent triboelectric nanogenerator , 2017, Microsystems & Nanoengineering.

[15]  Ying-Chih Lai,et al.  Electric Eel‐Skin‐Inspired Mechanically Durable and Super‐Stretchable Nanogenerator for Deformable Power Source and Fully Autonomous Conformable Electronic‐Skin Applications , 2016, Advanced materials.

[16]  Xiuli Fu,et al.  Machine‐Washable Textile Triboelectric Nanogenerators for Effective Human Respiratory Monitoring through Loom Weaving of Metallic Yarns , 2016, Advanced materials.

[17]  Long Lin,et al.  Theoretical Investigation and Structural Optimization of Single‐Electrode Triboelectric Nanogenerators , 2014 .

[18]  J. Brugger,et al.  Penciling a triboelectric nanogenerator on paper for autonomous power MEMS applications , 2017 .

[19]  Tae Yun Kim,et al.  Nanopatterned textile-based wearable triboelectric nanogenerator. , 2015, ACS nano.

[20]  Yonggang Huang,et al.  Waterproof AlInGaP optoelectronics on stretchable substrates with applications in biomedicine and robotics. , 2010, Nature materials.

[21]  Long Lin,et al.  Sustainable Energy Source for Wearable Electronics Based on Multilayer Elastomeric Triboelectric Nanogenerators , 2017 .