Sheath-Core Graphite/Silk Fiber Made by Dry-Meyer-Rod-Coating for Wearable Strain Sensors.

Recent years have witnessed the explosive development of flexible strain sensors. Nanomaterials have been widely utilized to fabricate flexible strain sensors, because of their high flexibility and electrical conductivity. However, the fabrication processes for nanomaterials and the subsequent strain sensors are generally complicated and are manufactured at high cost. In this work, we developed a facile dry-Meyer-rod-coating process to fabricate sheath-core-structured single-fiber strain sensors using ultrafine graphite flakes as the sheath and silk fibers as the core by virtue of their flexibility, high production, and low cost. The fabricated strain sensor exhibits a high sensitivity with a gauge factor of 14.5 within wide workable strain range up to 15%, and outstanding stability (up to 3000 cycles). The single-fiber-based strain sensors could be attached to a human body to detect joint motions or easily integrated into the multidirectional strain sensor for monitoring multiaxial strain, showing great potential applications as wearable strain sensors.

[1]  Yei Hwan Jung,et al.  Stretchable silicon nanoribbon electronics for skin prosthesis , 2014, Nature Communications.

[2]  Babak Ziaie,et al.  Highly stretchable and sensitive unidirectional strain sensor via laser carbonization. , 2015, ACS applied materials & interfaces.

[3]  Taeghwan Hyeon,et al.  Wearable Electronics: Transparent and Stretchable Interactive Human Machine Interface Based on Patterned Graphene Heterostructures (Adv. Funct. Mater. 3/2015) , 2015 .

[4]  Lim Wei Yap,et al.  Highly Stretchy Black Gold E‐Skin Nanopatches as Highly Sensitive Wearable Biomedical Sensors , 2015 .

[5]  Jie Xiong,et al.  Polymer‐Embedded Carbon Nanotube Ribbons for Stretchable Conductors , 2010, Advanced materials.

[6]  L. Qu,et al.  All‐Graphene Core‐Sheath Microfibers for All‐Solid‐State, Stretchable Fibriform Supercapacitors and Wearable Electronic Textiles , 2013, Advanced materials.

[7]  Bin Sun,et al.  Recent advances in flexible and stretchable electronic devices via electrospinning , 2014 .

[8]  E. Wang,et al.  Super-elastic graphene ripples for flexible strain sensors. , 2011, ACS nano.

[9]  Fuh-Gwo Yuan,et al.  Carbon nanotube yarn strain sensors , 2010, Nanotechnology.

[10]  Lain‐Jong Li,et al.  Plasma-assisted electrochemical exfoliation of graphite for rapid production of graphene sheets , 2014 .

[11]  Bo Wang,et al.  Graphene/polydimethylsiloxane nanocomposite strain sensor. , 2013, The Review of scientific instruments.

[12]  I. Park,et al.  Ultra-stretchable and skin-mountable strain sensors using carbon nanotubes–Ecoflex nanocomposites , 2015, Nanotechnology.

[13]  Sang-Gook Kim,et al.  Extremely Elastic Wearable Carbon Nanotube Fiber Strain Sensor for Monitoring of Human Motion. , 2015, ACS nano.

[14]  Miao Yu,et al.  Patterned, highly stretchable and conductive nanofibrous PANI/PVDF strain sensors based on electrospinning and in situ polymerization. , 2016, Nanoscale.

[15]  Hyungdong Lee,et al.  Directly printed stretchable strain sensor based on ring and diamond shaped silver nanowire electrodes , 2015 .

[16]  Bin Hu,et al.  Stretchable Self‐Powered Fiber‐Based Strain Sensor , 2015 .

[17]  Stéphanie P. Lacour,et al.  Extended cyclic uniaxial loading of stretchable gold thin-films on elastomeric substrates , 2009 .

[18]  I. Park,et al.  Stretchable, Skin‐Mountable, and Wearable Strain Sensors and Their Potential Applications: A Review , 2016 .

[19]  Shuo-Hung Chang,et al.  Fabrication of single-walled carbon nanotube flexible strain sensors with high sensitivity , 2008 .

[20]  Yong Zhu,et al.  Highly Conductive and Stretchable Silver Nanowire Conductors , 2012, Advanced materials.

[21]  Ja Hoon Koo,et al.  Conductive Fiber‐Based Ultrasensitive Textile Pressure Sensor for Wearable Electronics , 2015, Advanced materials.

[22]  C. Hierold,et al.  Spatially resolved Raman spectroscopy of single- and few-layer graphene. , 2006, Nano letters.

[23]  Jong-Hyun Ahn,et al.  Graphene-based transparent strain sensor , 2013 .

[24]  Yan Zhang,et al.  A self-powered piezotronic strain sensor based on single ZnSnO3 microbelts , 2013 .

[25]  Inkyu Park,et al.  Carbon nanotubes-ecoflex nanocomposite for strain sensing with ultra-high stretchability , 2015, 2015 28th IEEE International Conference on Micro Electro Mechanical Systems (MEMS).

[26]  Yuan Cheng,et al.  Structures, mechanical properties and applications of silk fibroin materials , 2015 .

[27]  Chanseok Lee,et al.  Ultrasensitive mechanical crack-based sensor inspired by the spider sensory system , 2014, Nature.

[28]  N. Lee,et al.  Stretchable, Transparent, Ultrasensitive, and Patchable Strain Sensor for Human-Machine Interfaces Comprising a Nanohybrid of Carbon Nanotubes and Conductive Elastomers. , 2015, ACS nano.

[29]  Genevieve Dion,et al.  Natural Fiber Welded Electrode Yarns for Knittable Textile Supercapacitors , 2015 .

[30]  Yongan Huang,et al.  Non-wrinkled, highly stretchable piezoelectric devices by electrohydrodynamic direct-writing. , 2014, Nanoscale.

[31]  Miao Zhu,et al.  Ultra-sensitive graphene strain sensor for sound signal acquisition and recognition , 2015, Nano Research.

[32]  Qinqin Zhou,et al.  Small and light strain sensors based on graphene coated human hairs. , 2015, Nanoscale.

[33]  Mark J. Schulz,et al.  A carbon nanotube strain sensor for structural health monitoring , 2006 .

[34]  S. Lacour,et al.  Soft metal constructs for large strain sensor membrane , 2015 .

[35]  Yue Zhang,et al.  Flexible piezoresistive strain sensor based on single Sb-doped ZnO nanobelts , 2010 .

[36]  Bernardo Zuccarello,et al.  Local Reinforcement Effect of a Strain Gauge Installation on Low Modulus Materials , 2005 .

[37]  Taeghwan Hyeon,et al.  Oxide Nanomembrane Hybrids with Enhanced Mechano‐ and Thermo‐Sensitivity for Semitransparent Epidermal Electronics , 2015, Advanced healthcare materials.

[38]  Steve F. A. Acquah,et al.  Carbon nanotubes on a spider silk scaffold , 2013, Nature Communications.

[39]  Satish Nagarajaiah,et al.  Nanotube film based on single-wall carbon nanotubes for strain sensing , 2004 .

[40]  Yi Cui,et al.  A transparent electrode based on a metal nanotrough network. , 2013, Nature nanotechnology.