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Proposal for dark exciton based chemical sensors.

Abstract：

:The rapidly increasing use of sensors throughout different research disciplines and the demand for more efficient devices with less power consumption depends critically on the emergence of new sensor materials and novel sensor concepts. Atomically thin transition metal dichalcogenides have a huge potential for sensor development within a wide range of applications. Their optimal surface-to-volume ratio combined with strong light-matter interaction results in a high sensitivity to changes in their surroundings. Here, we present a highly efficient sensing mechanism to detect molecules based on dark excitons in these materials. We show that the presence of molecules with a dipole moment transforms dark states into bright excitons, resulting in an additional pronounced peak in easy accessible optical spectra. This effect exhibits a huge potential for sensor applications, since it offers an unambiguous optical fingerprint for the detection of molecules-in contrast to common sensing schemes relying on small peak shifts and intensity changes.

journal_name

Nat Commun

journal_title

Nature communications

authors

Feierabend M,Berghäuser G,Knorr A,Malic E

doi

10.1038/ncomms14776

subject

Has Abstract

pub_date

2017-03-15 00:00:00

pages

14776

issn

2041-1723

pii

ncomms14776

journal_volume

8

pub_type

杂志文章

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