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Identifier

000457375

Title

Electrical impedance spectroscopy of relative humidity sensors based on NiPS3

Alternative Title

Φασματοσκοπία ηλεκτρικής εμπέδησης αισθητήρων σχετικής υγρασίας βασισμένων σε NiPS3

Author

Αρμάου, Ναταλία Ε.

Thesis advisor

Δεληγεώργης, Γεώργιος

Reviewer

Ηλιόπουλος, Ελευθέριος
Λυμπεράκης, Λιβέριος

Abstract

Resistive humidity sensors have been extensively explored, because of their signal stability and low hysteresis, as well as their uses in medicine, environmental monitoring, and wearable electronics. In recent humidity sensors, research has focused on the study and application of two-dimensional materials, as they present unique properties compared to their three-dimensional counterparts, due to their low surface to volume ratio. A new family of two-dimensional materials, transition metal phosphorus trichalcogenides MPX₃, are important candidates for the fabrication of sensors for various applications. In previous work we observed the structural characteristics of the material by changing parameters in the fabrication process, such as the applied power and the duration of the sonication, and also the solvent in use. Here, we explore the deposition of the material and we perform electrical characterization using I-V measurements and Electrical Impedance Spectroscopy (EIS) in a humidity and temperature controlled environment. EIS is widely used to investigate the electrical behavior of the sensor in a range of frequencies, understand the physical mechanisms of detection that are taking place, and fabricate the equivalent circuit for further integrated electrical analysis. Our goal is to connect the electrical performance with the applied parameters of the fabrication process, and as a result we will be able to fabricate novel relative humidity sensors with improved characteristics such as better sensitivity, shorter response and recovery times, and easy repeatability in manufacturing.

Language

English

Subject

Αισθητήρες σχετικής υγρασίας

Issue date

2023-07-28

Collection

School/Department--School of Sciences and Engineering--Department of Physics--Post-graduate theses

Type of Work--Post-graduate theses

Permanent Link

https://elocus.lib.uoc.gr//dlib/6/7/1/metadata-dlib-1689675360-321405-12476.tkl