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Issue 22, 2014
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Time capsule: an autonomous sensor and recorder based on diffusion–reaction

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Abstract

We describe the use of chemical diffusion and reaction to record temporally varying chemical information as spatial patterns without the need for external power. Diffusion of chemicals acts as a clock, while reactions forming immobile products possessing defined optical properties perform sensing and recording functions simultaneously. The spatial location of the products reflects the history of exposure to the detected substances of interest. We refer to our device as a time capsule and show an initial proof of principle in the autonomous detection of lead ions in water.

Graphical abstract: Time capsule: an autonomous sensor and recorder based on diffusion–reaction

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Publication details

The article was received on 31 May 2014, accepted on 27 Aug 2014 and first published on 28 Aug 2014


Article type: Communication
DOI: 10.1039/C4LC00640B
Author version available: Download Author version (PDF)
Citation: Lab Chip, 2014,14, 4324-4328
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    Time capsule: an autonomous sensor and recorder based on diffusion–reaction

    L. C. Gerber, L. Rosenfeld, Y. Chen and S. K. Y. Tang, Lab Chip, 2014, 14, 4324
    DOI: 10.1039/C4LC00640B

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