Porous carbon nanowire array for surface-enhanced Raman spectroscopy

Nan Chen, Ting-Hui Xiao (), Zhenyi Luo, Yasutaka Kitahama, Kotaro Hiramatsu, Naoki Kishimoto, Tamitake Itoh, Zhenzhou Cheng and Keisuke Goda ()
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Nan Chen: The University of Tokyo
Ting-Hui Xiao: The University of Tokyo
Zhenyi Luo: The University of Tokyo
Yasutaka Kitahama: The University of Tokyo
Kotaro Hiramatsu: The University of Tokyo
Naoki Kishimoto: Tohoku University
Tamitake Itoh: National Institute of Advanced Industrial Science and Technology
Zhenzhou Cheng: The University of Tokyo
Keisuke Goda: The University of Tokyo

Nature Communications, 2020, vol. 11, issue 1, 1-8

Abstract: Abstract Surface-enhanced Raman spectroscopy (SERS) is a powerful tool for vibrational spectroscopy as it provides several orders of magnitude higher sensitivity than inherently weak spontaneous Raman scattering by exciting localized surface plasmon resonance (LSPR) on metal substrates. However, SERS can be unreliable for biomedical use since it sacrifices reproducibility, uniformity, biocompatibility, and durability due to its strong dependence on “hot spots”, large photothermal heat generation, and easy oxidization. Here, we demonstrate the design, fabrication, and use of a metal-free (i.e., LSPR-free), topologically tailored nanostructure composed of porous carbon nanowires in an array as a SERS substrate to overcome all these problems. Specifically, it offers not only high signal enhancement (~106) due to its strong broadband charge-transfer resonance, but also extraordinarily high reproducibility due to the absence of hot spots, high durability due to no oxidization, and high compatibility to biomolecules due to its fluorescence quenching capability.

Date: 2020
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DOI: 10.1038/s41467-020-18590-7

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