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Research Article

In-situ growth of gold nanoparticles on electrospun flexible multilayered PVDF nanofibers for SERS sensing of molecules and bacteria

Dongzhen Chen1,§, Liang Zhang1,§, Pan Ning2, Haozhi Yuan3, Yu Zhang4, Meng Zhang5( ), Tao Fu2( ), Xinhai He1( )
Key laboratory of functional textile sensing fiber and irregular shape weaving technology School of Materials Science & Engineering Xi'an Polytechnic University Xi'an 710048 China
Key Laboratory of Biomedical Information Engineering of Ministry of Education School of Life Science and Technology Xi'an Jiaotong University Xi'an 710049 China
State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University Xi'an 710049 China
Non-equilibrium Condensed Matter and Quantum Engineering Laboratory. The Key Laboratory of Ministry of Education School of Science Xi'an Jiaotong University Xi'an 710049 China
Department of Neurology The First Affiliated Hospital of Xi'an Jiaotong University Xi'an 710061 China

§ Dongzhen Chen and Liang Zhang contributed equally to this work.

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Graphical Abstract

Abstract

Plasmonic surface of flexible multilayered nanofibers possesses special superiority for the surface-enhanced Raman scattering (SERS) sensing of molecules and microbial cells. However, the fabrication of flexible plasmonic nanofibers with high sensitivity and reproducibility is difficult. Herein, we report a smart strategy for fabricating flexible plasmonic fibers, in which compact and homogeneous gold nanoparticles (Au NPs) are in-situ grown on the high-curvature surface of multilayered fibers of electrospun polyvinylidene fluoride (PVDF). Firstly, the surface of PVDF fibers is changed electrically, and Au seeds are deposited on the surface of PVDF fibers using electrostatic driving force. Secondly, a stable AuI4- complex is formed employing coordination between I- and AuCl4- ions, which could decrease the reduction potential of AuCl4- and restrain the self-nucleation, and then the reduction reaction of AuI4- is initiated by introducing PVDF@Au seeds to pull down the barrier of potential energy. Finally, in-situ growth of AuNPs is generated on the high-curvature surface of PVDF nanofibers, and large-scale hotspots are generated by adjacent AuNPs coupling in the three-dimensional (3D) space of multilayered fibers. Membrane of PVDF@Au nanofibers also realizes the sensitive detection of thiram molecules (low limit of detection of 0.1 nM) and good reproducibility (relative standard deviation of 10.6%). Meanwhile, due to the multilayered construction of PVDF@Au nanofibers, a valid SERS signal on 3D surface of bacteria could be generated. 3D distribution of hotspots on multilayered PVDF@Au nanofibers gives a clear advantage for SERS sensing of organic molecules and microbial cells.

Keywords

electrospinning polyvinylidene fluoride (PVDF)in-situ growth of goldthree-dimensional (3D) multilayered nanofibersflexible surface-enhanced Raman scattering (SERS) substratebacteria sensing

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Nano Research
Volume 14 Issue 12,
December 2021
Pages 4885-4893
DOI: 10.1007/s12274-021-3530-9
Cite this article:
Chen D, Zhang L, Ning P, et al. In-situ growth of gold nanoparticles on electrospun flexible multilayered PVDF nanofibers for SERS sensing of molecules and bacteria. Nano Research, 2021, 14(12): 4885-4893. https://doi.org/10.1007/s12274-021-3530-9
Topics:
Raman spectroscopy

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Received: 17 January 2021
Revised: 14 April 2021
Accepted: 20 April 2021
Published: 07 June 2021
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2021
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