Subnanometer-resolved chemical imaging via multivariate analysis of tip-enhanced Raman maps.

ABSTRACT: Tip-enhanced Raman spectroscopy (TERS) is a powerful surface analysis technique that can provide subnanometer-resolved images of nanostructures with site-specific chemical fingerprints. However, due to the limitation of weak Raman signals and the resultant difficulty in achieving TERS imaging with good signal-to-noise ratios (SNRs), the conventional single-peak analysis is unsuitable for distinguishing complex molecular architectures at the subnanometer scale. Here we demonstrate that the combination of subnanometer-resolved TERS imaging and advanced multivariate analysis can provide an unbiased panoramic view of the chemical identity and spatial distribution of different molecules on surfaces, yielding high-quality chemical images despite limited SNRs in individual pixel-level spectra. Th

SUBMITTER: Jiang S 

PROVIDER: S-EPMC6062048 | biostudies-literature | 2017 Nov

REPOSITORIES: biostudies-literature