Seeing two-dimensional sheets on arbitrary substrates by fluorescence quenching microscopy

Abstract

Fluorescence quenching microscopy (FQM) is demonstrated as a low-cost and high-throughput technique for seeing graphene-like 2D sheets such as MoS2 . FQM provides high contrast and layer resolution comparable to those of scanning electron microscopy, but allows the imaging of samples deposited on arbitrary substrates, including non-conductive substrates such as quartz. Solution fluorescence quenching studies suggest that FQM should be feasible for many other 2D materials such as WS2 , Bi2 Te3 , MoSe2 , NbSe2 , and TaS2 .

Keywords: 2D materials; Förster resonance energy transfer; fluorescence quenching microscopy; graphene; molybdenum disulfide.