Abstract

Colorimetry detects a color change resulted from a chemical reaction or molecular binding. Despite its widespread use in sensing, continuous monitoring of analytes with colorimetry is difficult, especially when the color-producing reaction or binding is irreversible. Here, we report on a gradient-based colorimetric sensor (GCS) to overcome this limitation. Lateral transport of analytes across a colorimetric sensor surface creates a color gradient that shifts along the transport direction over time, and GCS tracks the gradient shift and converts it into analyte concentration in real time. Using a low cost complementary metal-oxide semiconductor imager and imaging processing algorithm, we show submicrometer gradient shift tracking precision and continuous monitoring of ppb-level ozone.

Original languageEnglish (US)
Pages (from-to)5375-5380
Number of pages6
JournalAnalytical Chemistry
Volume90
Issue number8
DOIs
StatePublished - Apr 17 2018

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Colorimetry
Gases
Color
Monitoring
Sensors
Ozone
Image sensors
Chemical reactions
Metals
Imaging techniques
Processing
Costs
Direction compound
Oxide semiconductors

ASJC Scopus subject areas

  • Analytical Chemistry

Cite this

Gradient-Based Colorimetric Sensors for Continuous Gas Monitoring. / Lin, Chenwen; Zhu, Ying; Yu, Jingjing; Qin, Xingcai; Xian, Xiaojun; Tsow, Francis; Forzani, Erica; Wang, Di; Tao, Nongjian.

In: Analytical Chemistry, Vol. 90, No. 8, 17.04.2018, p. 5375-5380.

Research output: Contribution to journalArticle

Lin, Chenwen ; Zhu, Ying ; Yu, Jingjing ; Qin, Xingcai ; Xian, Xiaojun ; Tsow, Francis ; Forzani, Erica ; Wang, Di ; Tao, Nongjian. / Gradient-Based Colorimetric Sensors for Continuous Gas Monitoring. In: Analytical Chemistry. 2018 ; Vol. 90, No. 8. pp. 5375-5380.
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