1 research outputs found
Core–Shell Nanorod Columnar Array Combined with Gold Nanoplate–Nanosphere Assemblies Enable Powerful In Situ SERS Detection of Bacteria
Development
of a label-free ultrasensitive nanosensor for detection of bacteria
is presented. Sensitive assay for Gram-positive bacteria was achieved
via electrostatic attraction-guided plasmonic bifacial superstructure/bacteria/columnar
array assembled in one step. Dynamic optical hotspots were formed
in the hybridized nanoassembly under wet–dry critical state
amplifying efficiently the weak vibrational modes of three representative
food-borne Gram-positive bacteria, that is, Staphylococcus
xylosus, Listeria monocytogenes, and Enterococcus faecium. These
three bacteria with highly analogous Raman spectra can be effectively
differentiated through droplet wet–dry critical SERS approach
combined with 3D PCA statistical analysis so that highly sensitive
discrimination of bacterial species and samples containing mixtures
of bacteria can be achieved