Ecofriendly Filtration of Silver Nanoparticles for Ultrasensitive Surface-Enhanced (Resonance) Raman Spectroscopy-Based Detection.

ABSTRACT: In this study, a widely used colloid of Creighton AgNPs (ORI, 1-100 nm, mostly ≤ 40 nm, ∼10 μg mL^-1) was rapidly manipulated via tangential flow filtration (TFF) for highly reproducible surface-enhanced (resonance) Raman spectroscopy (SE(R)RS) experiments down to the single-molecule (SM) level. The quasi-spherical AgNPs were size-selected, purified, and concentrated in two TFF fractions of a cutoff diameter of ∼40 nm: AgNP ≤ 40 (∼900 μg mL^-1) and AgNP ≥ 40 (∼100 μg mL^-1). The SE(R)S-based sensing capabilities of the two TFF fractions were then tested under pre-resonance (632.8 nm) and resonance (532.1 nm) excitation conditions for rhodamine 6G (R6G, 10^-6-10^-15 M). Both TFF isolates, AgNP ≤ 40 and AgNP ≥ 40, were more effective in adsor

SUBMITTER: Dorney KM 

PROVIDER: S-EPMC11457218 | biostudies-literature | 2024 Oct

REPOSITORIES: biostudies-literature