Fig. 6

A Highly branched flower-like Fe₃O₄@SiO₂@Ag nano-hybrid for bacteria detection: Schematic of the synthesis of Fe₃O₄@SiO₂@Ag micro-flowers and corresponding SEM images at each step and SERS spectra for the detection of different concentrations of Staphylococcus Aureus using the nanohybrid; B Schematic of the synthesis of PEI-modified nanohybrids for the capture and enrichment of bacteria, SEM of Fe₃O₄@Au@PEI-Escherichia coli complex and corresponding SERS spectra and PCA differentiation between Escherichia Coli BL21 and Staphylococcus Aureus 24018. C Schematic illustration of Fe₃O₄/Au/Ag nano-hybrids for adenosine sensing and SERS spectra illustrating the detection with the sensing array (B) Reprinted with permission from ref. [171] (A); [95] (B) and [172] (C).