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1. (WO2018017524) 2H TO 1T PHASE BASED TRANSITION METAL DICHALCOGENIDE SENSOR FOR OPTICAL AND ELECTRONIC DETECTION OF STRONG ELECTRON DONOR CHEMICAL VAPORS

Pub. No.:    WO/2018/017524    International Application No.:    PCT/US2017/042504
Publication Date: Fri Jan 26 00:59:59 CET 2018 International Filing Date: Wed Jul 19 01:59:59 CEST 2017
IPC: G01N 27/12
G01N 21/25
C07C 211/05
C01G 39/06
Applicants: THE GOVERNMENT OF THE UNITED STATES OF AMERICA, AS REPRESENTED BY THE SECRETARY OF THE NAVY
FRIEDMAN, Adam, L.
PERKINS, F., Keith
CULBERTSON, James, C.
HANBICKI, Aubrey, T.
CAMPBELL, Paul, M.
Inventors: FRIEDMAN, Adam, L.
PERKINS, F., Keith
CULBERTSON, James, C.
HANBICKI, Aubrey, T.
CAMPBELL, Paul, M.
Title: 2H TO 1T PHASE BASED TRANSITION METAL DICHALCOGENIDE SENSOR FOR OPTICAL AND ELECTRONIC DETECTION OF STRONG ELECTRON DONOR CHEMICAL VAPORS
Abstract:
Optical and electronic detection of chemicals, and particularly strong electron-donors, by 2H to IT phase-based transition metal dichalcogenide (TMD) films, detection apparatus incorporating the TMD films, methods for forming the detection apparatus, and detection systems and methods based on the TMD films are provided. The detection apparatus includes a 2H phase TMD film that transitions to the IT phase under exposure to strong electron donors. After exposure, the phase state can be determined to assess whether all or a portion of the TMD has undergone a transition from the 2H phase to the IT phase. Following detection, TMD films in the IT phase can be converted back to the 2H phase, resulting in a reusable chemical sensor that is selective for strong electron donors.