# Nanoplasmonics within a biofilm

## TL;DR

This study investigates how biofilm-templated gold nanonetworks facilitate the transition from localized to surface plasmon resonance, revealing insights into plasmonic behavior influenced by biofilm structure and gold precursor concentration.

## Contribution

It demonstrates a novel biofilm-based platform to study plasmon transitions and links optical properties to electrical percolation states in gold nanocomposites.

## Key findings

- Transition from non-percolating to percolating states observed
- Optical plasmon peaks depend on gold precursor concentration
- Electrical properties correlate with metal atom percolation

## Abstract

Biofilm templated gold nanonetwork provide a platform to study the transition of local plasmon to a surface plasmon. The switch from localized surface plasmon resonance (LSPR) to surface plasmon resonance (SPR) is induced by the percolation of metal atoms between gold nano-islands. Formed nano-composites showed a transition in metal percolation state (non-percolating to percolating state), as evident from electrical properties. The optical component of the study followed a previously tested method by our group, in which photonic coherences are induced by biofilms. Peaks were obtained in enhancement spectra that were found to correspond with plasmonic peaks, which in turn depended on Au precursor concentration that had been added.