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Diameter-optimized high-order waveguide nanorods for fluorescence enhancement applied in ultrasensitive bioassays

Research output: Contribution to journalArticle

Original languageEnglish
Pages (from-to)14322-14329
Number of pages8
JournalNanoscale
DOIs
DateAccepted/In press - 15 Jun 2019
DatePublished (current) - 19 Jul 2019

Abstract

Development of fluorescence enhancement (FE) platforms based on ZnO nanorods (NRs) has sparked considerable interest, thanks to their well-demonstrated potential in chemical and biological detection. Among the multiple factors determining the FE performance, high-order waveguide modes are specifically promising in boosting the sensitivity and realizing selective detection. However, quantitative experimental studies on the influence of the NR diameter, substrate, and surrounding medium, on the waveguide-based FE properties remain lacking. In this work, we have designed and fabricated a FE platform based on patterned and well-defined arrays of vertical, hexagonal prism ZnO NRs with six distinct diameters. Both direct experimental evidence and theoretical simulations demonstrate that high-order waveguide modes play a crucial role in FE, and are strongly dependent on the NR diameter, substrate, and surrounding medium. Using the optimized FE platform, a significant limit of detection (LOD) of 10-16 mol L-1 for Rhodamine-6G probe detection is achieved. Especially, a LOD as low as 10-14 g mL-1 is demonstrated for a prototype biomarker of carcinoembryonic antigen, which is improved by one order compared with the best LOD ever reported using fluorescence-based detection. This work provides an efficient path to design waveguiding NRs-based biochips for ultrasensitive and highly-selective biosensing.

    Research areas

  • NANORODS, ZnO, BIOASSAYS, Sensing platforms, fluorescence, fluorescence enhancement, waveguides

Documents

Documents

  • Full-text PDF (accepted author manuscript)

    Rights statement: This is the accepted author manuscript (AAM). The final published version (version of record) is available online via The Royal Society of Chemistry at https://doi.org/10.1039/C9NR02330E . Please refer to any applicable terms of use of the publisher.

    Accepted author manuscript, 833 KB, PDF document

    Embargo ends: 19/07/20

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    Licence: Other

  • Supplementary information PDF

    Rights statement: This is the accepted author manuscript (AAM). The final published version (version of record) is available online via the Royal Society of Chemistry at https://doi.org/10.1039/C9NR02330E . Please refer to any applicable terms of use of the publisher.

    Accepted author manuscript, 1 MB, PDF document

    Embargo ends: 19/07/20

    Request copy

    Licence: Other

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