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

Authors
Wang, Rui; Prabhakar, Amlendu; Iglesias, Rodrigo Alejandro; Xian, Xiaojun; Shan, Xiaonan; Tsow, Francis; Forzani, Erica S.; Tao, Nongjian
Publication Year
2011
Language
English
Format
article
Status
Published version
Description
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.
Fil: Wang, Rui. Arizona State University; Estados Unidos
Fil: Prabhakar, Amlendu. Arizona State University; Estados Unidos
Fil: Iglesias, Rodrigo Alejandro. Arizona State University; Estados Unidos. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; Argentina
Fil: Xian, Xiaojun. Arizona State University; Estados Unidos
Fil: Shan, Xiaonan. Arizona State University; Estados Unidos
Fil: Tsow, Francis. Arizona State University; Estados Unidos
Fil: Forzani, Erica S.. Arizona State University; Estados Unidos
Fil: Tao, Nongjian. Arizona State University; Estados Unidos
Subject
CHEMICAL SENSORS
COLORIMETRY
ENVIRONMENTAL SENSORS
NITROGEN OXIDES
OZONE
Química Analítica
Ciencias Químicas
CIENCIAS NATURALES Y EXACTAS
Ingeniería Eléctrica y Electrónica
Ingeniería Eléctrica, Ingeniería Electrónica e Ingeniería de la Información
INGENIERÍAS Y TECNOLOGÍAS
Access level
Restricted access
License
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repository
CONICET Digital (CONICET)
Institution
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identifier
oai:ri.conicet.gov.ar:11336/82704