Droplet-between-electrodes for ultrahigh interfacial capacitive sensing

B. Nie, S. Xing, James D Brandt, Tingrui Pan

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Scopus citations


In this paper we have presented a novel droplet-based interfacial capacitive sensor, achieving ultrahigh mechanical-to-electrical sensitivity (1.58μF/kPa) and resolution (1.8Pa) using a simple device architecture. The miniature transparent droplet sensors consisted of two flexible polymer membranes with conductive coating and a separation layer hosting a sensing chamber for an electrolyte droplet. The sensing principle primarily relied on high elasticity of the sensing droplet and large capacitance presented at the electrode-electrolyte interface. Theoretical analyses and experimental investigations on several design parameters were thoroughly conducted to characterize and optimize the overall sensitivity of the device. Finally, the droplet sensor was successfully applied to detect minute blood pressure variations on the skin surface throughout cardiovascular cycles.

Original languageEnglish (US)
Title of host publicationTechnical Digest - Solid-State Sensors, Actuators, and Microsystems Workshop
PublisherTransducer Research Foundation
Number of pages4
ISBN (Print)9780964002494
StatePublished - 2012
Event2012 Solid-State Sensors, Actuators and Microsystems Workshop, Hilton Head 2012 - Hilton Head, United States
Duration: Jun 3 2012Jun 7 2012


Other2012 Solid-State Sensors, Actuators and Microsystems Workshop, Hilton Head 2012
Country/TerritoryUnited States
CityHilton Head

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Electrical and Electronic Engineering
  • Hardware and Architecture


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