Bacteria-induced changes in the ultrafast plasmonic response of silver nanostructured surfaces

ORAL

Abstract

The antimicrobial properties of silver have been known for millenia, finding use in coinage, cutlery, medical device coatings, and textiles. The consensus regarding the origin of this mechanism is that bacterial metabolism is disrupted by uptake of silver ions following oxidative dissolution at the bacteria-silver interface. The manifestation of this interaction on the plasmonic response of silver nanoparticles is investigated here. Changes in the nanoparticle crystallinity, size, and shape are observed after interaction with E.coli via transient absorption spectroscopy. Bacterial exposure leads to a decrease in the electron-phonon coupling time, an increase in the lattice-environment coupling time, and rapid damping of coherent oscillations. This bacterial action was studied using E.coli, known to be susceptible to silver ion uptake, and was enhanced with a membrane permeability-increasing agent. The changes in the plasmonic response are explained by an increase in the free electron density and amorphization of the silver nanoparticles, as well as modification of the silver nanocrystal film thickness. 

*Fondazione Cariplo (Grant No. 2018–0979), EU Horizon 2020 research/innovation programme (Grant No. 816313), Department of National Defence Discovery (Grant No. CFPMN1–008).

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Publication: Giuseppe M. Paternò, Aaron M. Ross, Silvia M. Pietralunga, Simone Normani, Nicholas Dalla Vedova, Jakkarin Limwongyut, Gaia Bondelli, Liliana Moscardi, Guillermo C. Bazan, Francesco Scotognella, and Guglielmo Lanzani , "The impact of bacteria exposure on the plasmonic response of silver nanostructured surfaces", Chem. Phys. Rev. 2, 021401 (2021) https://doi.org/10.1063/5.0042547

Presenters

  • Aaron M Ross

    • Politecnico di Milano
    • Physics Department, Politecnico di Milano, Piazza L. da Vinci 32, 20133 Milano, Italy

Authors

  • Aaron M Ross

    • Politecnico di Milano
    • Physics Department, Politecnico di Milano, Piazza L. da Vinci 32, 20133 Milano, Italy

  • Giuseppe M Paterno

    • Center for Nano Science and Technology, Istituto Italiano di Tecnologia (IIT), Via Pascoli 10, 20133, Milano, Italy

  • Silvia Pietralunga

    • Center for Nano Science and Technology, Istituto Italiano di Tecnologia (IIT), Via Pascoli 10, 20133, Milano, Italy

  • Simone Normani

    • Center for Nano Science and Technology, Istituto Italiano di Tecnologia (IIT), Via Pascoli 10, 20133, Milano, Italy

  • Nicholas Dalla Vedova

    • Center for Nano Science and Technology, Istituto Italiano di Tecnologia (IIT), Via Pascoli 10, 20133, Milano, Italy

  • Jakkarin Limwongyut

    • Center for Polymers and Organic Solids, Department of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106, USA

  • Gaia Bondelli

    • Center for Nano Science and Technology, Istituto Italiano di Tecnologia (IIT), Via Pascoli 10, 20133, Milano, Italy

  • Liliana Moscardi

    • Center for Nano Science and Technology, Istituto Italiano di Tecnologia (IIT), Via Pascoli 10, 20133, Milano, Italy

  • Guillermo C Bazan

    • Center for Polymers and Organic Solids, Department of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106, USA

  • Francesco Scotognella

    • Politecnico di Milano + Istituto di Fotonica e Nanotecnologie CNR
    • Physics Department, Politecnico di Milano, Piazza L. da Vinci 32, 20133 Milano, Italy
    • Politecnico di Milano

  • Guglielmo Lanzani

    • Politecnico di Milano + CNST @ Istituto Italiano di Tecnologia (IIT)
    • Physics Department, Politecnico di Milano, Piazza L. da Vinci 32, 20133 Milano, Italy