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A dual-channel optical magnetometer based on magnetically responsive inverse opal microspheres

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Abstract

Responsive photonic crystals (RPCs) with tunable optical signals have intrinsic advantages in the construction of colorimetric sensors. Here, we report a dual-channel photonic crystal sensor fabricated by suspending ETPTA-TPM inverse opal microspheres (IOMs) in an aqueous ferrofluid for the detection of magnetic field strength. These nonmagnetic IOMs will quickly arrange into chain structures along the field direction, leading to the quenching of reflection signals in several minutes. Generally, a stronger magnetic field causes a faster quenching and a larger decline of reflection intensity. Based on the above correlation, a dual-channel sensor was fabricated to detect magnetic field strength in a broad range according to reflection quenching time and quenching ratio. The sensing of the magnetic field is accurate, stable and reliable, because the working of the PC sensor only involves magnetic tuning but no magnetic assembly.

Graphical abstract: A dual-channel optical magnetometer based on magnetically responsive inverse opal microspheres

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Publication details

The article was received on 14 May 2017, accepted on 08 Jun 2017 and first published on 09 Jun 2017


Article type: Paper
DOI: 10.1039/C7TC02119D
Citation: J. Mater. Chem. C, 2017, Advance Article
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    A dual-channel optical magnetometer based on magnetically responsive inverse opal microspheres

    Y. Zhang, Y. Jiang, X. Wu and J. Ge, J. Mater. Chem. C, 2017, Advance Article , DOI: 10.1039/C7TC02119D

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