Smartphone based portable bacteria pre-concentrating microfluidic sensor and impedance sensing system

Jing Jiang, Xinhao Wang, Ran Chao, Yukun Ren, Chengpeng Hu, Zhida Xu, Gang Logan Liu

Research output: Contribution to journalArticlepeer-review


Portable low-cost sensors and sensing systems for the identification and quantitative measurement of bacteria in field water are critical in preventing drinking water from being contaminated by bacteria. In this article, we reported the design, fabrication and testing of a low-cost, miniaturized and sensitive bacteria sensor based on electrical impedance spectroscopy method using a smartphone as the platform. Our design of microfluidics enabled the pre-concentration of the bacteria which lowered the detection limit to 10 bacterial cells per milliliter. We envision that our demonstrated smartphone-based sensing system will realize highly-sensitive and rapid in-field quantification of multiple species of bacteria and pathogens.

Original languageEnglish (US)
Pages (from-to)653-659
Number of pages7
JournalSensors and Actuators, B: Chemical
StatePublished - Mar 31 2014
Externally publishedYes


  • Bacteria sensing
  • Impedance spectroscopy
  • Smartphone sensor
  • Wireless sensor

ASJC Scopus subject areas

  • Instrumentation
  • Materials Chemistry
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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