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Issue 4, 2018
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Real-time subcellular imaging based on graphene biosensors

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Non-invasive living cell microscopy in real time is essential for a wide variety of biomedical research. Here, we present a subcellular refractive index imaging technique for living cells based on a graphene biosensor system. Owing to the optical reflectivity differences of graphene to s- and p-polarizations, a 45° generalized-cylindrical-vector-polarized laser beam is employed to demodulate the reflected cylindrical vector beam for differential detecting. Benefitting from the vector beam-enabled common-path graphene biosensor, the imaging spatial resolution and refractive index sensitivity are noticeably improved. Subcellular refractive index mapping of live human colonic cancer cells is perfectly achieved without inducing any cell damage. Furthermore, real-time monitoring of an individual cell is also performed with the disassembly of the cell nucleolus clearly observed. This technique would be a promising tool for the study of living cell morphology, kinetics, and pathology, and for other biomedical research.

Graphical abstract: Real-time subcellular imaging based on graphene biosensors

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The article was received on 09 Oct 2017, accepted on 09 Dec 2017 and first published on 14 Dec 2017

Article type: Paper
DOI: 10.1039/C7NR07479D
Citation: Nanoscale, 2018,10, 1759-1765
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    Real-time subcellular imaging based on graphene biosensors

    L. Sun, Y. Zhang, Y. Wang, Y. Yang, C. Zhang, X. Weng, S. Zhu and X. Yuan, Nanoscale, 2018, 10, 1759
    DOI: 10.1039/C7NR07479D

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