Abstract

Colorimetry is a powerful sensing principle that detects a target analyte based on a reaction-induced color change. The approach can be highly sensitive and selective when a sensing material that reacts specifically with the analyte is found, but the specific reaction is usually accompanied by slow recovery and irreversibility, making continuous monitoring of air quality difficult. Consequently, colorimetry is often one-time only and single-point measurement. To overcome the difficulty, the present work reports a combined microfluidic and colorimetric approach that measures time evolution of a color gradient along a microfluidic channel via a complementary metal-oxide-semiconductor (CMOS) imager. The change of the color gradient provides continuous monitoring of the analyte concentration over many hours, and the principle and capability of the approach is demonstrated by theoretical simulation, and experimental validation with real samples.

Original languageEnglish (US)
Article number6064866
Pages (from-to)1529-1535
Number of pages7
JournalIEEE Sensors Journal
Volume12
Issue number5
DOIs
StatePublished - 2012

Fingerprint

Microfluidics
colorimetry
Colorimetry
Color
color
Monitoring
sensors
Sensors
gradients
air quality
Air quality
Image sensors
CMOS
recovery
Recovery
Metals
simulation

Keywords

  • Chemical sensors
  • colorimetry
  • environmental sensors
  • nitrogen oxides
  • ozone

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Instrumentation

Cite this

A microfluidic-colorimetric sensor for continuous monitoring of reactive environmental chemicals. / Wang, Rui; Prabhakar, Amlendu; Iglesias, Rodrigo A.; Xian, Xiaojun; Shan, Xiaonan; Tsow, Francis; Forzani, Erica; Tao, Nongjian.

In: IEEE Sensors Journal, Vol. 12, No. 5, 6064866, 2012, p. 1529-1535.

Research output: Contribution to journalArticle

Wang, Rui ; Prabhakar, Amlendu ; Iglesias, Rodrigo A. ; Xian, Xiaojun ; Shan, Xiaonan ; Tsow, Francis ; Forzani, Erica ; Tao, Nongjian. / A microfluidic-colorimetric sensor for continuous monitoring of reactive environmental chemicals. In: IEEE Sensors Journal. 2012 ; Vol. 12, No. 5. pp. 1529-1535.
@article{79c7f713918d452b910a8c6efdbbc0f4,
title = "A microfluidic-colorimetric sensor for continuous monitoring of reactive environmental chemicals",
abstract = "Colorimetry is a powerful sensing principle that detects a target analyte based on a reaction-induced color change. The approach can be highly sensitive and selective when a sensing material that reacts specifically with the analyte is found, but the specific reaction is usually accompanied by slow recovery and irreversibility, making continuous monitoring of air quality difficult. Consequently, colorimetry is often one-time only and single-point measurement. To overcome the difficulty, the present work reports a combined microfluidic and colorimetric approach that measures time evolution of a color gradient along a microfluidic channel via a complementary metal-oxide-semiconductor (CMOS) imager. The change of the color gradient provides continuous monitoring of the analyte concentration over many hours, and the principle and capability of the approach is demonstrated by theoretical simulation, and experimental validation with real samples.",
keywords = "Chemical sensors, colorimetry, environmental sensors, nitrogen oxides, ozone",
author = "Rui Wang and Amlendu Prabhakar and Iglesias, {Rodrigo A.} and Xiaojun Xian and Xiaonan Shan and Francis Tsow and Erica Forzani and Nongjian Tao",
year = "2012",
doi = "10.1109/JSEN.2011.2174218",
language = "English (US)",
volume = "12",
pages = "1529--1535",
journal = "IEEE Sensors Journal",
issn = "1530-437X",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
number = "5",

}

TY - JOUR

T1 - A microfluidic-colorimetric sensor for continuous monitoring of reactive environmental chemicals

AU - Wang, Rui

AU - Prabhakar, Amlendu

AU - Iglesias, Rodrigo A.

AU - Xian, Xiaojun

AU - Shan, Xiaonan

AU - Tsow, Francis

AU - Forzani, Erica

AU - Tao, Nongjian

PY - 2012

Y1 - 2012

N2 - Colorimetry is a powerful sensing principle that detects a target analyte based on a reaction-induced color change. The approach can be highly sensitive and selective when a sensing material that reacts specifically with the analyte is found, but the specific reaction is usually accompanied by slow recovery and irreversibility, making continuous monitoring of air quality difficult. Consequently, colorimetry is often one-time only and single-point measurement. To overcome the difficulty, the present work reports a combined microfluidic and colorimetric approach that measures time evolution of a color gradient along a microfluidic channel via a complementary metal-oxide-semiconductor (CMOS) imager. The change of the color gradient provides continuous monitoring of the analyte concentration over many hours, and the principle and capability of the approach is demonstrated by theoretical simulation, and experimental validation with real samples.

AB - Colorimetry is a powerful sensing principle that detects a target analyte based on a reaction-induced color change. The approach can be highly sensitive and selective when a sensing material that reacts specifically with the analyte is found, but the specific reaction is usually accompanied by slow recovery and irreversibility, making continuous monitoring of air quality difficult. Consequently, colorimetry is often one-time only and single-point measurement. To overcome the difficulty, the present work reports a combined microfluidic and colorimetric approach that measures time evolution of a color gradient along a microfluidic channel via a complementary metal-oxide-semiconductor (CMOS) imager. The change of the color gradient provides continuous monitoring of the analyte concentration over many hours, and the principle and capability of the approach is demonstrated by theoretical simulation, and experimental validation with real samples.

KW - Chemical sensors

KW - colorimetry

KW - environmental sensors

KW - nitrogen oxides

KW - ozone

UR - http://www.scopus.com/inward/record.url?scp=84860194406&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84860194406&partnerID=8YFLogxK

U2 - 10.1109/JSEN.2011.2174218

DO - 10.1109/JSEN.2011.2174218

M3 - Article

VL - 12

SP - 1529

EP - 1535

JO - IEEE Sensors Journal

JF - IEEE Sensors Journal

SN - 1530-437X

IS - 5

M1 - 6064866

ER -