2h to 1t phase based transition metal dichalcogenide sensor for optical and electronic detection of strong electron donor chemical vapors

A system for detecting whether a chemical vapor comprises a strong electron donor, comprising:

• at least one sensor comprising a transition metal chalcogenide thin film comprising at least one region having a 2H phase;
• an apparatus for evaluating the transition metal chalcogenide thin film comprising at least one region having a 2H phase to assess whether the phase of the at least one region is 2H or 1T;
• and
• a transmitter that generates a signal indicating that the chemical vapor comprises a strong electron donor if the phase of the at least one region of the transition metal chalcogenide thin film has changed from 2H to 1T.

A sensor for detecting strong electron donors, comprising:

• a substrate;
• a transition metal dichalcogenide thin film comprising at least one first region having a 2H phase;
• and
• at least two electrically-conductive leads,
• wherein at least two second regions of the transition metal dichalcogenide thin film that are directly in contact with the at least two electrically-conductive leads have a 1T phase.