University of Illinois Urbana-Champaign

Smart-phone-based electrochemical sensor for environmental applications

Wang, Xinhao

Content Files
WANG-THESIS-2015.pdf

Permalink

https://hdl.handle.net/2142/78601

Description

Title
Smart-phone-based electrochemical sensor for environmental applications
Author(s)
Wang, Xinhao
Issue Date
2015-04-13
Department of Study
Electrical & Computer Eng
Discipline
Electrical & Computer Engr
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
M.S.
Degree Level
Thesis
Date of Ingest
2015-07-22T22:33:12Z
Keyword(s)
  • electrochemistry
  • impedance
  • smart-phone
Abstract
We demonstrated a mobile phone sensing platform, MoboSens, with integrated plug-n-play microelectronic ionic sensor that performs electrochemical measurement by using audio jack of a smart phone. This platform was used to measure nitrate concentration using a few microliter liquid samples on field along with providing geospatial map locations through a wireless network. This compact MoboSens platform (~65 gram), based on a smart phone, is able to detect nitrate concentration in water with a detection limit of 0.2 ppm within 1 minute. The nitrate ion detection on MoboSens platform is performed by a microfabricated microfluidic sensor utilizing a cyclic voltammetry based electrochemical process. The stability of the measurements was verified by performing the experiments under varying temperature, pH and ion interference conditions. The mobile phone app reports the quantitative nitrate sensing results along with user-input metadata. The results can be automatically saved on secure cloud servers or can be pushed on public social media, e.g., Twitter. Finally, the digital sensing information can be retrieved with geospatial information tagged on an internet map service, e.g., Bing Map, for public sharing and viewing. We tested this lab-on-a-chip mobile sensing platform for field water quality measurement and confirmed our mobile sensing results with other existing analytical testing methods.
Graduation Semester
2015-5
Type of Resource
text
Permalink
http://hdl.handle.net/2142/78601
Copyright and License Information
Copyright 2015 Xinhao Wang

Owning Collections

Graduate Dissertations and Theses at Illinois PRIMARY
Graduate Theses and Dissertations at Illinois
Dissertations and Theses - Electrical and Computer Engineering
Dissertations and Theses in Electrical and Computer Engineering