Issue 22, 2014

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

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

Supplementary files

Article information

Article type
Communication
Submitted
31 May 2014
Accepted
27 Aug 2014
First published
28 Aug 2014

Lab Chip, 2014,14, 4324-4328

Author version available

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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