Chemical Identification of Interlayer Contaminants within van der Waals Heterostructures.

ABSTRACT: van der Waals heterostructures (vdWHs) leverage the characteristics of two-dimensional (2D) material building blocks to create a myriad of structures with unique and desirable properties. Several commonly employed fabrication strategies rely on polymeric stamps to assemble layers of 2D materials into vertical stacks. However, the properties of such heterostructures frequently are degraded by contaminants, typically of unknown composition, trapped between the constituent layers. Such contaminants, therefore, impede studies of the intrinsic properties of heterostructures and hinder their application. Here, we use the photothermal induced resonance (PTIR) technique to obtain infrared spectra and maps of the contaminants down to a few attomoles and with nanoscale resolution. Heterostructures c

SUBMITTER: Schwartz JJ 

PROVIDER: S-EPMC6903401 | biostudies-literature | 2019 Jul

REPOSITORIES: biostudies-literature