Skin‐Inspired Electronics and Its Applications in Advanced Intelligent Systems

Recent interdisciplinary progress in flexible materials, devices, and system designs has brought about an emerging paradigm of skin‐like multifunctional electronic platforms named skin‐inspired electronics. Featured with excellent flexible mechanical properties, thin and conformal devices, and integrated sensing functions similar to those of human skin, skin‐inspired electronics exhibit great potential in the application fields of wearable electronics and human–machine interfaces. Many real‐world implementations of the intelligent system of skin‐inspired electronics in healthcare monitoring, artificial prosthetics via the creation of sensitive skin, and robot tactile perception are demonstrated. Combined with the technologies of wireless data transmission, self‐powered supply modules, and signal‐processing circuits, skin‐inspired electronics are expected to achieve improved portability, multifunctional integration, on‐site analysis, and in‐time feedback. Herein, recent advances in skin‐inspired electronics, its promising solutions to engineering challenges, and opinions on future research directions are discussed.

[1]  Brett E. Bouma,et al.  A Bio-Inspired Swellable Microneedle Adhesive for Mechanical Interlocking with Tissue , 2013, Nature Communications.

[2]  Jeonghyun Kim,et al.  Materials and Device Designs for an Epidermal UV Colorimetric Dosimeter with Near Field Communication Capabilities , 2017 .

[3]  Chiara Bartolozzi,et al.  Robots with a sense of touch. , 2016, Nature materials.

[4]  James J. S. Norton,et al.  Materials and Optimized Designs for Human‐Machine Interfaces Via Epidermal Electronics , 2013, Advanced materials.

[5]  Phillip Won,et al.  A soft, wearable microfluidic device for the capture, storage, and colorimetric sensing of sweat , 2016, Science Translational Medicine.

[6]  Xiaojie Xu,et al.  A Real‐Time Wearable UV‐Radiation Monitor based on a High‐Performance p‐CuZnS/n‐TiO2 Photodetector , 2018, Advanced materials.

[7]  Yihui Huang,et al.  Development of dopant-free conductive bioelastomers , 2016, Scientific Reports.

[8]  Oussama Khatib,et al.  A hierarchically patterned, bioinspired e-skin able to detect the direction of applied pressure for robotics , 2018, Science Robotics.

[9]  Xuewen Wang,et al.  Flexible Capacitive Tactile Sensor Based on Micropatterned Dielectric Layer. , 2016, Small.

[10]  N. Sammel,et al.  Prediction of serious arrhythmic events after myocardial infarction: signal-averaged electrocardiogram, Holter monitoring and radionuclide ventriculography. , 1987, Journal of the American College of Cardiology.

[11]  Nicholas V. Annetta,et al.  A Conformal, Bio-Interfaced Class of Silicon Electronics for Mapping Cardiac Electrophysiology , 2010, Science Translational Medicine.

[12]  Peng Sun,et al.  Tailorable and Wearable Textile Devices for Solar Energy Harvesting and Simultaneous Storage. , 2016, ACS nano.

[13]  Q. Pei,et al.  A Water‐Based Silver‐Nanowire Screen‐Print Ink for the Fabrication of Stretchable Conductors and Wearable Thin‐Film Transistors , 2016, Advanced materials.

[14]  Z. Lou,et al.  Recent Advances in Smart Wearable Sensing Systems , 2018, Advanced Materials Technologies.

[15]  Jung Woo Lee,et al.  Multifunctional Skin‐Like Electronics for Quantitative, Clinical Monitoring of Cutaneous Wound Healing , 2014, Advanced healthcare materials.

[16]  Z. Jane Wang,et al.  Novel Tactile Sensor Technology and Smart Tactile Sensing Systems: A Review , 2017, Sensors.

[17]  Zhenan Bao,et al.  Stretchable Polymer Semiconductors for Plastic Electronics , 2018 .

[18]  Unyong Jeong,et al.  Conducting Polymer Dough for Deformable Electronics , 2016, Advanced materials.

[19]  Zhaona Wang,et al.  Eardrum‐Inspired Active Sensors for Self‐Powered Cardiovascular System Characterization and Throat‐Attached Anti‐Interference Voice Recognition , 2015, Advanced materials.

[20]  Ryan B. Wicker,et al.  3D Printing multifunctionality: structures with electronics , 2014 .

[21]  Yuhao Liu,et al.  Lab-on-Skin: A Review of Flexible and Stretchable Electronics for Wearable Health Monitoring. , 2017, ACS nano.

[22]  Chin-Teng Lin,et al.  Development of Wireless Brain Computer Interface With Embedded Multitask Scheduling and its Application on Real-Time Driver's Drowsiness Detection and Warning , 2008, IEEE Transactions on Biomedical Engineering.

[23]  Youngjin Park,et al.  A wet-tolerant adhesive patch inspired by protuberances in suction cups of octopi , 2017, Nature.

[24]  J. Windmiller,et al.  Electrochemical tattoo biosensors for real-time noninvasive lactate monitoring in human perspiration. , 2013, Analytical chemistry.

[25]  Claire M. Lochner,et al.  Monitoring of Vital Signs with Flexible and Wearable Medical Devices , 2016, Advanced materials.

[26]  Nan Sun,et al.  Modular and Reconfigurable Wireless E‐Tattoos for Personalized Sensing , 2019, Advanced Materials Technologies.

[27]  Wenlong Cheng,et al.  Resistive electronic skin , 2017 .

[28]  Rachit Patel,et al.  Noninvasive Gluco Pulse Watch , 2018, International Conference on Advanced Computing Networking and Informatics.

[29]  C. Grigoropoulos,et al.  All-inkjet-printed flexible electronics fabrication on a polymer substrate by low-temperature high-resolution selective laser sintering of metal nanoparticles , 2007 .

[30]  Jung-Yong Lee,et al.  Wearable textile battery rechargeable by solar energy. , 2013, Nano letters.

[31]  Yong Zhu,et al.  Nanomaterial‐Enabled Wearable Sensors for Healthcare , 2018, Advanced healthcare materials.

[32]  M. Takamiya,et al.  Sheet-Type Flexible Organic Active Matrix Amplifier System Using Pseudo-CMOS Circuits With Floating-Gate Structure , 2012, IEEE Transactions on Electron Devices.

[33]  B. Lu,et al.  High-Performance Piezoelectric Nanogenerators with Imprinted P(VDF-TrFE)/BaTiO3 Nanocomposite Micropillars for Self-Powered Flexible Sensors. , 2017, Small.

[34]  T. Someya,et al.  Printable elastic conductors by in situ formation of silver nanoparticles from silver flakes. , 2017, Nature materials.

[35]  Wenlong Jin,et al.  A Flexible Self‐Powered Sensing Element with Integrated Organic Thermoelectric Generator , 2019, Advanced Materials Technologies.

[36]  Carmel Majidi,et al.  An autonomously electrically self-healing liquid metal–elastomer composite for robust soft-matter robotics and electronics , 2018, Nature Materials.

[37]  Zhenan Bao,et al.  Self-healing soft electronics , 2019, Nature Electronics.

[38]  Allister F. McGuire,et al.  A skin-inspired organic digital mechanoreceptor , 2015, Science.

[39]  Jayoung Kim,et al.  Simultaneous Monitoring of Sweat and Interstitial Fluid Using a Single Wearable Biosensor Platform , 2018, Advanced science.

[40]  Shuye Zhang,et al.  An Ultrastable Ionic Chemiresistor Skin with an Intrinsically Stretchable Polymer Electrolyte , 2018, Advanced materials.

[41]  Siti Anom Ahmad,et al.  Pressure Sensor: State of the Art, Design, and Application for Robotic Hand , 2015, J. Sensors.

[42]  Hye Rim Cho,et al.  A graphene-based electrochemical device with thermoresponsive microneedles for diabetes monitoring and therapy. , 2016, Nature nanotechnology.

[43]  Ki H. Chon,et al.  Novel Conductive Carbon Black and Polydimethlysiloxane ECG Electrode: A Comparison with Commercial Electrodes in Fresh, Chlorinated, and Salt Water , 2015, Annals of Biomedical Engineering.

[44]  Youngjin Jeong,et al.  Highly Sensitive and Multimodal All‐Carbon Skin Sensors Capable of Simultaneously Detecting Tactile and Biological Stimuli , 2015, Advanced materials.

[45]  Zhong Lin Wang,et al.  A universal self-charging system driven by random biomechanical energy for sustainable operation of mobile electronics , 2015, Nature Communications.

[46]  Yao-Feng Chang,et al.  “Cut‐and‐Paste” Manufacture of Multiparametric Epidermal Sensor Systems , 2015, Advanced materials.

[47]  Jang-Yeon Kwon,et al.  A Highly Sensitive Tactile Sensor Using a Pyramid‐Plug Structure for Detecting Pressure, Shear Force, and Torsion , 2018, Advanced Materials Technologies.

[48]  Zhong Lin Wang,et al.  Flexible hybrid energy cell for simultaneously harvesting thermal, mechanical, and solar energies. , 2013, ACS nano.

[49]  Yonggang Huang,et al.  Stretchable and Foldable Silicon Integrated Circuits , 2008, Science.

[50]  Sabine Szunerits,et al.  Transdermal skin patch based on reduced graphene oxide: A new approach for photothermal triggered permeation of ondansetron across porcine skin , 2017, Journal of controlled release : official journal of the Controlled Release Society.

[51]  Benjamin C. K. Tee,et al.  25th Anniversary Article: The Evolution of Electronic Skin (E‐Skin): A Brief History, Design Considerations, and Recent Progress , 2013, Advanced materials.

[52]  Zhong Lin Wang,et al.  Self-powered textile for wearable electronics by hybridizing fiber-shaped nanogenerators, solar cells, and supercapacitors , 2016, Science Advances.

[53]  Yonggang Huang,et al.  Multifunctional Epidermal Electronics Printed Directly Onto the Skin , 2013, Advanced materials.

[54]  Manoj Kumar Gupta,et al.  Transparent flexible stretchable piezoelectric and triboelectric nanogenerators for powering portable electronics , 2015 .

[55]  Liu Wang,et al.  Multiscale Hierarchical Design of a Flexible Piezoresistive Pressure Sensor with High Sensitivity and Wide Linearity Range. , 2018, Small.

[56]  Jonathan A. Fan,et al.  Materials and Designs for Wireless Epidermal Sensors of Hydration and Strain , 2014 .

[57]  He Tian,et al.  An intelligent artificial throat with sound-sensing ability based on laser induced graphene , 2017, Nature Communications.

[58]  Jianxin He,et al.  Highly sensitive, self-powered and wearable electronic skin based on pressure-sensitive nanofiber woven fabric sensor , 2017, Scientific Reports.

[59]  Michiel Steyaert,et al.  A Fully Integrated $\Delta \Sigma$ ADC in Organic Thin-Film Transistor Technology on Flexible Plastic Foil , 2011, IEEE Journal of Solid-State Circuits.

[60]  Nabil Ahmed Sultan,et al.  Reflective thoughts on the potential and challenges of wearable technology for healthcare provision and medical education , 2015, Int. J. Inf. Manag..

[61]  Yihui Zhang,et al.  Binodal, wireless epidermal electronic systems with in-sensor analytics for neonatal intensive care , 2019, Science.

[62]  Yi Yang,et al.  Epidermis Microstructure Inspired Graphene Pressure Sensor with Random Distributed Spinosum for High Sensitivity and Large Linearity. , 2018, ACS nano.

[63]  Yi Shi,et al.  Highly Sensitive, Printable Nanostructured Conductive Polymer Wireless Sensor for Food Spoilage Detection. , 2018, Nano letters (Print).

[64]  Xian Jun Loh,et al.  Using Artificial Skin Devices as Skin Replacements: Insights into Superficial Treatment. , 2019, Small.

[65]  R. Potts,et al.  Glucose monitoring by reverse iontophoresis , 2002, Diabetes/metabolism research and reviews.

[66]  G. G. Stokes "J." , 1890, The New Yale Book of Quotations.

[67]  Ravinder Dahiya,et al.  Energy autonomous electronic skin , 2019, npj Flexible Electronics.

[68]  Timothy M Swager,et al.  Wireless gas detection with a smartphone via rf communication , 2014, Proceedings of the National Academy of Sciences.

[69]  John A. Rogers,et al.  Recent progress in flexible and stretchable piezoelectric devices for mechanical energy harvesting, sensing and actuation , 2016 .

[70]  Jeong Sook Ha,et al.  Stretchable, Skin-Attachable Electronics with Integrated Energy Storage Devices for Biosignal Monitoring. , 2019, Accounts of chemical research.

[71]  B. Cho,et al.  A wearable thermoelectric generator fabricated on a glass fabric , 2014 .

[72]  E. O. Polat,et al.  Energy‐Autonomous, Flexible, and Transparent Tactile Skin , 2017 .

[73]  Zhong Lin Wang,et al.  Flexible triboelectric generator , 2012 .

[74]  John A Rogers,et al.  Soft Elastomers with Ionic Liquid-Filled Cavities as Strain Isolating Substrates for Wearable Electronics. , 2017, Small.

[75]  Wenlong Cheng,et al.  Toward Soft Skin‐Like Wearable and Implantable Energy Devices , 2017 .

[76]  Ying-Chih Lai,et al.  Actively Perceiving and Responsive Soft Robots Enabled by Self‐Powered, Highly Extensible, and Highly Sensitive Triboelectric Proximity‐ and Pressure‐Sensing Skins , 2018, Advanced materials.

[77]  Taeghwan Hyeon,et al.  Cephalopod‐Inspired Miniaturized Suction Cups for Smart Medical Skin , 2016, Advanced healthcare materials.

[78]  Weiqing Yang,et al.  Cowpea-structured PVDF/ZnO nanofibers based flexible self-powered piezoelectric bending motion sensor towards remote control of gestures , 2019, Nano Energy.

[79]  Dong Jun Lee,et al.  Transparent and Stretchable Interactive Human Machine Interface Based on Patterned Graphene Heterostructures , 2015 .

[80]  Jan G. Korvink,et al.  Printed electronics: the challenges involved in printing devices, interconnects, and contacts based on inorganic materials , 2010 .

[81]  Zhenan Bao,et al.  Pursuing prosthetic electronic skin. , 2016, Nature materials.

[82]  Taeghwan Hyeon,et al.  Ultrathin Quantum Dot Display Integrated with Wearable Electronics , 2017, Advanced materials.

[83]  Ayesha Sultana,et al.  Human skin interactive self-powered wearable piezoelectric bio-e-skin by electrospun poly-l-lactic acid nanofibers for non-invasive physiological signal monitoring. , 2017, Journal of materials chemistry. B.

[84]  Dan Dan Zhu,et al.  Insulin delivery systems combined with microneedle technology. , 2018, Advanced drug delivery reviews.

[85]  Jung Woo Lee,et al.  Self-assembled three dimensional network designs for soft electronics , 2017, Nature Communications.

[86]  Timothy M. Swager,et al.  Wireless Hazard Badges to Detect Nerve-Agent Simulants. , 2016, Angewandte Chemie.

[87]  Yongzhi Wu,et al.  A nanofiber based artificial electronic skin with high pressure sensitivity and 3D conformability. , 2016, Nanoscale.

[88]  Amay J. Bandodkar,et al.  Wearable Chemical Sensors: Present Challenges and Future Prospects , 2016 .

[89]  Wojciech Matusik,et al.  Learning the signatures of the human grasp using a scalable tactile glove , 2019, Nature.

[90]  Sam Emaminejad,et al.  Fully integrated wearable sensor arrays for multiplexed in situ perspiration analysis , 2016, Nature.

[91]  Qingjun Liu,et al.  Battery‐Free and Wireless Epidermal Electrochemical System with All‐Printed Stretchable Electrode Array for Multiplexed In Situ Sweat Analysis , 2019, Advanced Materials Technologies.

[92]  R. Potts,et al.  Correlation between sweat glucose and blood glucose in subjects with diabetes. , 2012, Diabetes technology & therapeutics.

[93]  Jeonghyun Kim,et al.  Battery-free, skin-interfaced microfluidic/electronic systems for simultaneous electrochemical, colorimetric, and volumetric analysis of sweat , 2019, Science Advances.

[94]  Rong Zhu,et al.  Electronic Skin with Multifunction Sensors Based on Thermosensation , 2017, Advanced materials.

[95]  Michael C. McAlpine,et al.  Graphene-based wireless bacteria detection on tooth enamel , 2012, Nature Communications.

[96]  Carmel Majidi,et al.  Hydroprinted Electronics: Ultrathin Stretchable Ag-In-Ga E-Skin for Bioelectronics and Human-Machine Interaction. , 2018, ACS applied materials & interfaces.

[97]  Xiaodan Gu,et al.  Intrinsically stretchable and healable semiconducting polymer for organic transistors , 2016, Nature.

[98]  Yu Tian,et al.  Recent developments in gecko-inspired dry adhesive surfaces from fabrication to application , 2019, Surface Topography: Metrology and Properties.

[99]  Wen Cheng,et al.  Advanced electronic skin devices for healthcare applications. , 2019, Journal of materials chemistry. B.

[100]  Sanat S Bhole,et al.  Soft Microfluidic Assemblies of Sensors, Circuits, and Radios for the Skin , 2014, Science.

[101]  Tse Nga Ng,et al.  Highly sensitive tactile sensors integrated with organic transistors , 2012 .

[102]  Takao Someya,et al.  Inflammation-free, gas-permeable, lightweight, stretchable on-skin electronics with nanomeshes. , 2017, Nature nanotechnology.

[103]  Boris Murmann,et al.  Highly stretchable polymer semiconductor films through the nanoconfinement effect , 2017, Science.

[104]  J. Y. Sim,et al.  Microstructured Porous Pyramid-Based Ultrahigh Sensitive Pressure Sensor Insensitive to Strain and Temperature. , 2019, ACS applied materials & interfaces.

[105]  John A Rogers,et al.  Soft, Skin-Interfaced Microfluidic Systems with Wireless, Battery-Free Electronics for Digital, Real-Time Tracking of Sweat Loss and Electrolyte Composition. , 2018, Small.

[106]  S. Ko,et al.  Highly Stretchable and Highly Conductive Metal Electrode by Very Long Metal Nanowire Percolation Network , 2012, Advanced materials.

[107]  Benjamin C. K. Tee,et al.  Flexible polymer transistors with high pressure sensitivity for application in electronic skin and health monitoring , 2013, Nature Communications.

[108]  Boris Murmann,et al.  Skin electronics from scalable fabrication of an intrinsically stretchable transistor array , 2018, Nature.

[109]  Zheng Lou,et al.  Flexible and transparent capacitive pressure sensor with patterned microstructured composite rubber dielectric for wearable touch keyboard application , 2018, Science China Materials.

[110]  Sam Emaminejad,et al.  Autonomous sweat extraction and analysis applied to cystic fibrosis and glucose monitoring using a fully integrated wearable platform , 2017, Proceedings of the National Academy of Sciences.

[111]  Seyed Ali Mousavi Shaegh,et al.  Microfluidics for Advanced Drug Delivery Systems , 2015, Current opinion in chemical engineering.

[112]  Wei Gao,et al.  Wearable Microsensor Array for Multiplexed Heavy Metal Monitoring of Body Fluids , 2016 .

[113]  John A Rogers,et al.  Soft, stretchable, fully implantable miniaturized optoelectronic systems for wireless optogenetics , 2015, Nature Biotechnology.

[114]  Takao Someya,et al.  Toward a new generation of smart skins , 2019, Nature Biotechnology.

[115]  Jeonghyun Kim,et al.  An Epidermal Stimulation and Sensing Platform for Sensorimotor Prosthetic Control, Management of Lower Back Exertion, and Electrical Muscle Activation , 2016, Advanced materials.

[116]  Mahbub Hassan,et al.  A Survey of Wearable Devices and Challenges , 2017, IEEE Communications Surveys & Tutorials.

[117]  John A Rogers,et al.  Miniaturized Battery‐Free Wireless Systems for Wearable Pulse Oximetry , 2017, Advanced functional materials.

[118]  Tao Dong,et al.  A Review of Wearable Technologies for Elderly Care that Can Accurately Track Indoor Position, Recognize Physical Activities and Monitor Vital Signs in Real Time , 2017, Sensors.

[119]  Jinxin Zhang,et al.  Self-Powered Analogue Smart Skin. , 2016, ACS nano.

[120]  Zhong Lin Wang,et al.  Recent Progress in Electronic Skin , 2015, Advanced science.

[121]  Timothy Bretl,et al.  Large-area MRI-compatible epidermal electronic interfaces for prosthetic control and cognitive monitoring , 2019, Nature Biomedical Engineering.

[122]  R. Dahiya,et al.  Stretchable wireless system for sweat pH monitoring. , 2018, Biosensors & bioelectronics.

[123]  Sihong Wang,et al.  Self‐Powered Trajectory, Velocity, and Acceleration Tracking of a Moving Object/Body using a Triboelectric Sensor , 2014 .

[124]  Zhenan Bao,et al.  Skin-Inspired Electronics: An Emerging Paradigm. , 2018, Accounts of chemical research.

[125]  Zhenan Bao,et al.  Second Skin Enabled by Advanced Electronics , 2019, Advanced science.

[126]  Metin Sitti,et al.  Recent Advances in Wearable Transdermal Delivery Systems , 2018, Advanced materials.

[127]  Minjeong Ha,et al.  Triboelectric generators and sensors for self-powered wearable electronics. , 2015, ACS nano.

[128]  Nitish V. Thakor,et al.  Wireless Power Delivery to Flexible Subcutaneous Implants Using Capacitive Coupling , 2017, IEEE Transactions on Microwave Theory and Techniques.

[129]  Christofer Hierold,et al.  Skin Conformal Polymer Electrodes for Clinical ECG and EEG Recordings , 2018, Advanced healthcare materials.

[130]  Alex Chortos,et al.  A Sensitive and Biodegradable Pressure Sensor Array for Cardiovascular Monitoring , 2015, Advanced materials.

[131]  Yiin Kuen Fuh,et al.  Self-Powered Pressure Sensor with fully encapsulated 3D printed wavy substrate and highly-aligned piezoelectric fibers array , 2017, Scientific Reports.

[132]  Robert Langer,et al.  First-in-Human Testing of a Wirelessly Controlled Drug Delivery Microchip , 2012, Science Translational Medicine.

[133]  H-S Philip Wong,et al.  Continuous wireless pressure monitoring and mapping with ultra-small passive sensors for health monitoring and critical care , 2014, Nature Communications.

[134]  Sung Youb Kim,et al.  Tactile-direction-sensitive and stretchable electronic skins based on human-skin-inspired interlocked microstructures. , 2014, ACS nano.

[135]  Zhong Lin Wang,et al.  Flexible Weaving Constructed Self‐Powered Pressure Sensor Enabling Continuous Diagnosis of Cardiovascular Disease and Measurement of Cuffless Blood Pressure , 2018, Advanced Functional Materials.

[136]  Nae-Eung Lee,et al.  An All‐Elastomeric Transparent and Stretchable Temperature Sensor for Body‐Attachable Wearable Electronics , 2016, Advanced materials.

[137]  Zhenan Bao,et al.  A bioinspired flexible organic artificial afferent nerve , 2018, Science.

[138]  Nitish V. Thakor,et al.  Enabling Wireless Powering and Telemetry for Peripheral Nerve Implants , 2015, IEEE Journal of Biomedical and Health Informatics.

[139]  John A. Rogers,et al.  Waterproof, electronics-enabled, epidermal microfluidic devices for sweat collection, biomarker analysis, and thermography in aquatic settings , 2019, Science Advances.

[140]  Zhong Lin Wang,et al.  Skin-inspired highly stretchable and conformable matrix networks for multifunctional sensing , 2018, Nature Communications.

[141]  Takao Someya,et al.  A 100-V AC Energy Meter Integrating 20-V Organic CMOS Digital and Analog Circuits With a Floating Gate for Process Variation Compensation and a 100-V Organic pMOS Rectifier , 2012, IEEE Journal of Solid-State Circuits.

[142]  Sunjin Kim,et al.  Highly Sensitive Tactile Shear Sensor Using Spatially Digitized Contact Electrodes , 2019, Sensors.

[143]  Jung-Hwan Park,et al.  Microneedles for drug and vaccine delivery. , 2012, Advanced drug delivery reviews.

[144]  Minsu Kang,et al.  Multifunctional Smart Skin Adhesive Patches for Advanced Health Care , 2018, Advanced healthcare materials.

[145]  J. Brouwers Advanced and controlled drug delivery systems in clinical disease management , 1996, Pharmacy World and Science.

[146]  Xue Feng,et al.  Breathable and Stretchable Temperature Sensors Inspired by Skin , 2015, Scientific Reports.

[147]  Yaping Zang,et al.  Flexible and self-powered temperature–pressure dual-parameter sensors using microstructure-frame-supported organic thermoelectric materials , 2015, Nature Communications.

[148]  Naser El-Sheimy,et al.  Smartphone-Based Indoor Localization with Bluetooth Low Energy Beacons , 2016, Sensors.

[149]  Chin-Teng Lin,et al.  An Intelligent Telecardiology System Using a Wearable and Wireless ECG to Detect Atrial Fibrillation , 2010, IEEE Transactions on Information Technology in Biomedicine.

[150]  Young-Geun Park,et al.  Smart Sensor Systems for Wearable Electronic Devices , 2017, Polymers.

[151]  E. Sanchez-Sinencio,et al.  Challenges of printed electronics on flexible substrates , 2012, 2012 IEEE 55th International Midwest Symposium on Circuits and Systems (MWSCAS).

[152]  Joong Tark Han,et al.  Stretchable and Multimodal All Graphene Electronic Skin , 2016, Advanced materials.

[153]  K. Lee,et al.  Self-adhesive epidermal carbon nanotube electronics for tether-free long-term continuous recording of biosignals , 2014, Scientific Reports.