Electrooculogram (EOG) is a measurement technique to record the biopotential signals induced by the movement of the eyeballs and EOG signals are critical for the development of wearable medical sensors and interfaces for human-computer interaction. Unlike traditional “wet” electrodes which profoundly hinder the development of wearable EOG sensors, in this study, we report for the first time the use of graphene-coated fabric electrodes for EOG acquisition and overcome the limitations of conventional “wet” electrodes. We demonstrate the proof-of-concept of graphene textile electrodes for EOG acquisition with a side-by-side comparison to conventional Ag/AgCl electrodes.

1. WEARABLE GRAPHENE NANOTEXTILES FOR
MONITORING AND PROCESSING OF
BIOPOTENTIALS
Murat Kaya Yapici 1,2,3*
, Ata Jedari Golparvar 1
, Gizem Acar 1
, Özberk Öztürk 1
SU-MEMS
mems.sabanciuniv.edu
1
Faculty of Engineering and Natural Sciences, Sabanci University, Istanbul 34956, Turkey
2
Department of Electrical Engineering, University of Washington, Seattle, WA 98195, USA
3
Sabanci University Nanotechnology Research and Application Center, Istanbul 34956, Turkey
Pioneers of Graphene Textiles for Biopotential Monitoring and Processing
− Enabling Next Generation Technology for Wearables −
Abstract: We report the synthesis and application of graphene
e-textiles towards the development of wearable sensors for acquisi-
tion, routine monitoring and processing of biopotential signals. The
functionality of the developed graphene-coated textiles have been
demonstrated by non-invasive measurement of electrocardiography
(ECG) and electrooculography (EOG) signals. Excellent cross correla-
tion of up to 97% was achieved between signals measured with the
new textile electrode and that of a commercial silver/silver-chloride
(Ag/AgCl) electrode. Our pioneering efforts in this field will be
demonstrated by soft, functional nanotextile platforms with embed-
ded electronics; otherwise referred to as smart garments, which can
be employed in a variety of applications ranging from personalized
healthcare to human-computer interaction.
nylon
cotton
polyester
SYNTHESIS AND CHARACTERIZATION OF GRAPHENE TEXTILE ELECTRODES
G. Acar, O. Ozturk, M. K. Yapici* "Wearable Graphene Nanotextile Embedded Smart Armband for Cardiac Monitoring," Proc. of IEEE Sensors Conference, New Delhi, India, Oct.29-Nov.1, 2018.
A.J. Golparvar, M.K. Yapici*, “Electrooculography by Wearable Graphene Textiles,” IEEE Sensors, IEEE Sensors Journal, vol. 18, pp. 8971- 8978, 2018.
A.J. Golparvar, M.K. Yapici*, “Graphene-coated wearable textiles for EOG-based human-computer interaction,” Proc. of IEEE 15th Int. Conf. on Wearable and Implantable Body Sensor Networks (BSN), Las Vegas, USA, March 4-7, 2018.
A.J. Golparvar, M.K. Yapici*, “Wearable graphene textile-enabled EOG sensing,” Proc. of IEEE Sensors Conference, Glasgow, UK, Oct.29-Nov.1, 2017.
M.K. Yapici*, “Biopotential Monitoring With Graphene-coated Wearable Nanotextiles,” NanoTR, Antalya, Oct.22-25, 2017.
M.K. Yapici*, T. Alkhidir, “Intelligent Medical Garments with Graphene Functionalized Smart-Cloth ECG Sensors,” Sensors, vol.17 (4), 875, 2017.
M. K. Yapici*, "Wearable graphene textile sensors for biopotential monitoring", 5th Int. Conference on Bio-Sensing Technology, Riva Del Garda, Italy, May 7-10, 2017.
M. K. Yapici*, "Graphene-coated E-textile Smart Garments for Wearable Health Monitoring," 3rd USA Int. Conference on Surfaces, Coatings and NanoStructured Materials, NANOSMAT (Invited), Arlington, TX, USA, May 18-20, 2016.
M.K. Yapici*, T. Alkhidir, Y.A. Samad, K. Liao, “Graphene-Clad Textile Electrodes for Electrocardiogram Monitoring,” Sensors and Actuators B. Chemical, vol. 221, pp. 1469-1474, 2015.
T. Alkhidir, A. Sluzek, M.K. Yapici*, “Simple Method for Adaptive Filtering of Motion Artifacts in E-Textile Wearable ECG Sensors,” Proc. of 37th Int. Conf. of IEEE Engineering in Medicine and Biology Society, Milan, Italy, August 25-29, 2015.
T. Alkhidir, Y.A. Samad, Y. Li, K. Liao, M.K. Yapici*, “Graphene-Clad Textile Sensors for Intelligent Medical Garments,” Proc. of 2nd IEEE EMBS Micro and Nanotechnology in Medicine Conference (MNMC), Oahu, Hawaii, USA, Dec. 8-12, 2014.
Skin-electrode Contact Impedance Conductivity vs. Washability
Graphene Cladding Around the Fiber Conductive
Flexible
Washable
Weaveable
Wearable
Scalable
ACQUISITION, MONITORING AND PROCESSING OF BIOPOTENTIALS FOR WEARABLE,
PERSONALIZED HEALTHCARE, CONTROL AND INTERACTION WITH OBJECTS
*Contact: Murat Kaya Yapici, mkyapici@sabanciuniv.edu
Conventional Wet Electrode Graphene Textile Electrode 2015
2017
Typical
electrocardiogram
(ECG) waveform
Ag/AgCI electrodes,
patch-type, requires gel
Conventional ECG electrode
12 - electrode measurement configuration
CURRENT METHOD
OUR TECHNOLOGY
2019
Correlation of 91.3% over
durations up to 100 s.
Wearable graphene textiles for brain computer
interfaces (BCI) and human computer interaction (HCI).
97% Overlap
in Signals
EOG signals acquired using conventional Ag/AgCl electrodes (left figure) and graphene textile electrodes
(right figure) while eyes are positioned at different locations.