Iontronic microdroplet array for flexible ultrasensitive tactile sensing

Baoqing Nie, Ruya Li, James D Brandt, Tingrui Pan

Research output: Contribution to journalArticle

49 Citations (Scopus)

Abstract

An iontronic microdroplet array (IMA) device, using an ultra-large interfacial capacitance at the highly elastic droplet-electrode contact, has been proposed for flexible tactile sensing applications. The transparent IMA sensors consist of an array of nanoliter droplets sandwiched between two polymeric membranes with patterned transparent electrodes, forming the electrical double layers with remarkable unit-area capacitance. Under external loading, the membrane deformation results in the circumferential expansion at the highly elastic droplet-electrode contact, which offers a completely new capacitive sensing scheme with a dramatic increase in sensitivity. Under the simple device architecture, the IMA has achieved device sensitivity of 0.43 nF kPa-1 and a minimal detectable pressure of 33 Pa, the highest reported values for its dimension. In addition, the hysteresis of the droplet deformation has been reduced by introducing a layer of hydrophobic coating to the conductive electrode surface, ensuring a fast mechanical response (on the order of several milliseconds). To demonstrate the utility of the transparent flexible IMA sensor, it has been successfully mounted onto a fingertip setting to map different surface topologies and embedded into a wristband to resolve dynamic pressure waves throughout cardiovascular cycles.

Original languageEnglish (US)
Pages (from-to)1107-1116
Number of pages10
JournalLab on a Chip - Miniaturisation for Chemistry and Biology
Volume14
Issue number6
DOIs
StatePublished - Mar 21 2014

Fingerprint

Touch
Electrodes
Sensor arrays
Equipment and Supplies
Contacts (fluid mechanics)
Capacitance
Pressure
Polymeric membranes
Membranes
Hysteresis
Topology
Coatings

ASJC Scopus subject areas

  • Biochemistry
  • Chemistry(all)
  • Bioengineering
  • Biomedical Engineering

Cite this

Iontronic microdroplet array for flexible ultrasensitive tactile sensing. / Nie, Baoqing; Li, Ruya; Brandt, James D; Pan, Tingrui.

In: Lab on a Chip - Miniaturisation for Chemistry and Biology, Vol. 14, No. 6, 21.03.2014, p. 1107-1116.

Research output: Contribution to journalArticle

@article{8c3d194152e847e596bb80903c642dbf,
title = "Iontronic microdroplet array for flexible ultrasensitive tactile sensing",
abstract = "An iontronic microdroplet array (IMA) device, using an ultra-large interfacial capacitance at the highly elastic droplet-electrode contact, has been proposed for flexible tactile sensing applications. The transparent IMA sensors consist of an array of nanoliter droplets sandwiched between two polymeric membranes with patterned transparent electrodes, forming the electrical double layers with remarkable unit-area capacitance. Under external loading, the membrane deformation results in the circumferential expansion at the highly elastic droplet-electrode contact, which offers a completely new capacitive sensing scheme with a dramatic increase in sensitivity. Under the simple device architecture, the IMA has achieved device sensitivity of 0.43 nF kPa-1 and a minimal detectable pressure of 33 Pa, the highest reported values for its dimension. In addition, the hysteresis of the droplet deformation has been reduced by introducing a layer of hydrophobic coating to the conductive electrode surface, ensuring a fast mechanical response (on the order of several milliseconds). To demonstrate the utility of the transparent flexible IMA sensor, it has been successfully mounted onto a fingertip setting to map different surface topologies and embedded into a wristband to resolve dynamic pressure waves throughout cardiovascular cycles.",
author = "Baoqing Nie and Ruya Li and Brandt, {James D} and Tingrui Pan",
year = "2014",
month = "3",
day = "21",
doi = "10.1039/c3lc50994j",
language = "English (US)",
volume = "14",
pages = "1107--1116",
journal = "Lab on a Chip - Miniaturisation for Chemistry and Biology",
issn = "1473-0197",
publisher = "Royal Society of Chemistry",
number = "6",

}

TY - JOUR

T1 - Iontronic microdroplet array for flexible ultrasensitive tactile sensing

AU - Nie, Baoqing

AU - Li, Ruya

AU - Brandt, James D

AU - Pan, Tingrui

PY - 2014/3/21

Y1 - 2014/3/21

N2 - An iontronic microdroplet array (IMA) device, using an ultra-large interfacial capacitance at the highly elastic droplet-electrode contact, has been proposed for flexible tactile sensing applications. The transparent IMA sensors consist of an array of nanoliter droplets sandwiched between two polymeric membranes with patterned transparent electrodes, forming the electrical double layers with remarkable unit-area capacitance. Under external loading, the membrane deformation results in the circumferential expansion at the highly elastic droplet-electrode contact, which offers a completely new capacitive sensing scheme with a dramatic increase in sensitivity. Under the simple device architecture, the IMA has achieved device sensitivity of 0.43 nF kPa-1 and a minimal detectable pressure of 33 Pa, the highest reported values for its dimension. In addition, the hysteresis of the droplet deformation has been reduced by introducing a layer of hydrophobic coating to the conductive electrode surface, ensuring a fast mechanical response (on the order of several milliseconds). To demonstrate the utility of the transparent flexible IMA sensor, it has been successfully mounted onto a fingertip setting to map different surface topologies and embedded into a wristband to resolve dynamic pressure waves throughout cardiovascular cycles.

AB - An iontronic microdroplet array (IMA) device, using an ultra-large interfacial capacitance at the highly elastic droplet-electrode contact, has been proposed for flexible tactile sensing applications. The transparent IMA sensors consist of an array of nanoliter droplets sandwiched between two polymeric membranes with patterned transparent electrodes, forming the electrical double layers with remarkable unit-area capacitance. Under external loading, the membrane deformation results in the circumferential expansion at the highly elastic droplet-electrode contact, which offers a completely new capacitive sensing scheme with a dramatic increase in sensitivity. Under the simple device architecture, the IMA has achieved device sensitivity of 0.43 nF kPa-1 and a minimal detectable pressure of 33 Pa, the highest reported values for its dimension. In addition, the hysteresis of the droplet deformation has been reduced by introducing a layer of hydrophobic coating to the conductive electrode surface, ensuring a fast mechanical response (on the order of several milliseconds). To demonstrate the utility of the transparent flexible IMA sensor, it has been successfully mounted onto a fingertip setting to map different surface topologies and embedded into a wristband to resolve dynamic pressure waves throughout cardiovascular cycles.

UR - http://www.scopus.com/inward/record.url?scp=84894277936&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84894277936&partnerID=8YFLogxK

U2 - 10.1039/c3lc50994j

DO - 10.1039/c3lc50994j

M3 - Article

C2 - 24480933

AN - SCOPUS:84894277936

VL - 14

SP - 1107

EP - 1116

JO - Lab on a Chip - Miniaturisation for Chemistry and Biology

JF - Lab on a Chip - Miniaturisation for Chemistry and Biology

SN - 1473-0197

IS - 6

ER -