Gradient-Based Colorimetric Sensors for Continuous Gas Monitoring. Lin, C., Zhu, Y., Yi, J., Qin, X., Xian, X., Tsow, F., Forzani, E. S., Wang, D., & Tao, N. Analytical Chemistry, 90(8):5375–5380, April, 2018. ![Gradient-Based Colorimetric Sensors for Continuous Gas Monitoring [link]](https://bibbase.org/img/filetypes/link.svg "link")
Paper doi abstract bibtex 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.
@article{lin_gradient-based_2018,
title = {Gradient-{Based} {Colorimetric} {Sensors} for {Continuous} {Gas} {Monitoring}},
volume = {90},
url = {https://pubs.acs.org/doi/10.1021/acs.analchem.8b00506},
doi = {10.1021/acs.analchem.8b00506},
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.},
number = {8},
journal = {Analytical Chemistry},
author = {Lin, Chenwen and Zhu, Yin and Yi, Jingjing and Qin, Xingcai and Xian, Xiaojun and Tsow, Francis and Forzani, Erica S. and Wang, Di and Tao, Nongjian},
month = apr,
year = {2018},
pages = {5375--5380},
}
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