AVS 66th International Symposium & Exhibition
    2D Materials Wednesday Sessions
       Session 2D+EM+MN+NS-WeA

Paper 2D+EM+MN+NS-WeA7
Chemical Vapor Sensing with Transition Metal Dichalcogenides via Photoluminescence Modulation

Wednesday, October 23, 2019, 4:20 pm, Room A216

Session: 2D Device Physics and Applications
Presenter: Aubrey T. Hanbicki, U.S. Naval Research Laboratory
Authors: A.T. Hanbicki, U.S. Naval Research Laboratory
P.M. Campbell, U.S. Naval Research Laboratory
S.V. Sivaram, U.S. Naval Research Laboratory
A.J. Kusterbeck, Nova Research, Inc.
V.K. Nguyen, U.S. Naval Research Laboratory
R.A. McGill, U.S. Naval Research Laboratory
K.M. McCreary, U.S. Naval Research Laboratory
B.T. Jonker, U.S. Naval Research Laboratory
E.D. Cobas, U.S. Naval Research Laboratory
F.K. Perkins, U.S. Naval Research Laboratory
A.L. Friedman, Laboratory for Physical Sciences
Correspondent: Click to Email
Two-dimensional transition metal dichalcogenides (TMDs) such as MoS2 and MoSe2 are promising materials for chemical vapor sensing applications. Their potential includes straightforward fabrication, readily available materials, and good selectivity, sensitivity, and speed of response. We previously showed [1] that monolayer TMDs are sensitive to and selective for vapors of strong electron donors and/or strong electron acceptors in concentrations as low as 1 part per million (ppm). Another attractive aspect is that TMDs have been shown to detect chemical vapors and gases in several ways, for instance via changes in electrical conductance or photoluminescence (PL) [2]. Sensors commonly have been fabricated based on the chemiresistive device properties, but here we will discuss our recent studies implementing TMD sensors using the PL as the core element of the sensor. We show that the PL intensity of monolayer CVD-grown WS2 can rapidly (<< 1sec) detect triethylamine (TEA), a decomposition byproduct of the VX series of nerve agents, in concentrations <<1 ppm. The optical response is similar to the electrical response of other TMDs previously shown [1]. We shall discuss the mechanisms determining the size and shape of the optical responses. We envision suites of different TMDs using both optical and conductance sensing to rapidly and selectively detect chemical agents.

This research was performed while S.V.S held a National Research Council fellowship at NRL. This work was supported by core programs at NRL.

References

[1] A.L. Friedman et al., Sci. Reports 7, 3836 (2017)

[2] P.M. Campbell et al., Appl. Phys. Lett. 113, 163106 (2018)