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Epidermal Differential Impedance Sensor for Conformal Skin Hydration Monitoring

Journal Article · · Biointerphases
 [1];  [2];  [2];  [2]
  1. Univ. of Illinois at Urbana-Champaign, IL (United States); University of Illinois
  2. Univ. of Illinois at Urbana-Champaign, IL (United States)

We present the design and use of an ultrathin, stretchable sensor system capable of conformal lamination onto the skin, for precision measurement and spatial mapping of levels of hydration. This device, which we refer to as a class of ‘epidermal electronics’ due to its ‘skin-like’ construction and mode of intimate integration with the body, contains miniaturized arrays of impedance-measurement electrodes arranged in a differential configuration to compensate for common-mode disturbances. Experimental results obtained with different frequencies and sensor geometries demonstrate excellent precision and accuracy, as benchmarked against conventional, commercial devices. The reversible, non-invasive soft contact of this device with the skin makes its operation appealing for applications ranging from skin care, to athletic monitoring to health/wellness assessment.

Research Organization:
Univ. of Illinois at Urbana-Champaign, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division
Grant/Contract Number:
FG02-07ER46471; FG02-07ER46453
OSTI ID:
1875150
Journal Information:
Biointerphases, Journal Name: Biointerphases Journal Issue: 1 Vol. 7; ISSN 1934-8630
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

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Flexible and stretchable microneedle patches with integrated rigid stainless steel microneedles for transdermal biointerfacing text January 2016
Materials and Designs for Wireless Epidermal Sensors of Hydration and Strain journal March 2014
Ferromagnetic, Folded Electrode Composite as a Soft Interface to the Skin for Long‐Term Electrophysiological Recording journal September 2016
A Wearable Hydration Sensor with Conformal Nanowire Electrodes journal January 2017
High-Performance Biodegradable/Transient Electronics on Biodegradable Polymers journal April 2014
“Cut-and-Paste” Manufacture of Multiparametric Epidermal Sensor Systems journal September 2015
Flexible and Stretchable Physical Sensor Integrated Platforms for Wearable Human-Activity Monitoringand Personal Healthcare journal February 2016
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Recent advances in flexible sensors for wearable and implantable devices: Review journal June 2013
Application of Microfluidics in Wearable Devices journal November 2019
Temperature sensor based on exfoliated graphene sheets produced by microwave assisted freezing induced volumetric expansion of carbonated water journal February 2019
Epidermal radio frequency electronics for wireless power transfer journal October 2016
Multimodal epidermal devices for hydration monitoring journal June 2017
Imperceptible electrooculography graphene sensor system for human–robot interface journal July 2018
Wearable multifunctional sensors using printed stretchable conductors made of silver nanowires journal January 2014
Robust epidermal tattoo electrode platform for skin physiology monitoring journal January 2019
Thermal analysis of epidermal electronic devices integrated with human skin considering the effects of interfacial thermal resistance journal May 2018
Effect of AuNP-AuNP vdW interaction on the mechanics and piezoresistivity of AuNP-polymer nanocomposite journal May 2019
A novel sandwich structure for the flexible photonic device to meet the biosensing requirements journal June 2018
Nanocellulose–polyurethane substrate material with tunable mechanical properties for wearable electronics journal November 2018
Review of Modern Techniques for the Assessment of Skin Hydration journal March 2019
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