Ultrastable tip-enhanced hyperspectral optical nanoimaging for defect analysis of large-sized WS₂ layers.

ABSTRACT: Optical nanoimaging techniques, such as tip-enhanced Raman spectroscopy (TERS), are nowadays indispensable for chemical and optical characterization in the entire field of nanotechnology and have been extensively used for various applications, such as visualization of nanoscale defects in two-dimensional (2D) materials. However, it is still challenging to investigate micrometer-sized sample with nanoscale spatial resolution because of severe limitation of measurement time due to drift of the experimental system. Here, we achieved long-duration TERS imaging of a micrometer-sized WS₂ sample for 6 hours in a reproducible manner. Our ultrastable TERS system enabled to reveal the defect density on the surface of tungsten disulfide layers in large area equivalent to the device scale.

SUBMITTER: Kato R 

PROVIDER: S-EPMC9286508 | biostudies-literature | 2022 Jul

REPOSITORIES: biostudies-literature