Abstract
Transition metal dichalcogenides (TMDCs) are emerging to be an exciting class of 2D materials apart from graphene or hexagonal boron nitride (h-BN). They are a class of layered materials that exhibit inspiring properties which are worth exploring, among them PtSe2 is fairly a new addition. Although bulk PtSe2 was first synthesized more than a century ago, the study of its layer-dependent properties is still at a nascent stage. The monolayer of PtSe2 exhibits a band gap between 1.2 and 1.8 eV, the band gap starts to decrease with an increase in the number of layers thus transforming into semimetal type. Among all other 2D materials it shows the highest electron mobility of about 3000 cm2 V−1 s−1 and unlike other TMDCs, it is strikingly stable in ambient conditions. Owing to its stability and tunable properties, it has great potential in the fields of optoelectronics, spintronics, sensorics, and many more. In this book chapter, we report the thickness dependent spectroscopic properties of mechanically exfoliated PtSe2. We have explored low temperature Raman spectroscopy as well as polarized Raman spectroscopy to study in detail the vibrational properties of PtSe2. Raman spectroscopy is also employed to determine its thermal conductivity. We hope that this work will provide a fresh overview of PtSe2 from a spectroscopic perspective.
Highlights
Due to the unique properties and momentous potential of 2D materials, the research world jumped into the foray
The surge of discovery didn’t stop with graphene, it gathered pace, and “2D materials” like hexagonal boron nitride (h-BN), transition metal dichalcogenides (TMDCs), and several other layered materials came into existence
Its unique and exciting properties are worth exploring. It has a wide range of applications like photodetectors, gas sensing, electronics, Chalcogenides - Preparation and Applications piezoresistive sensors, and electrocatalysis [3–6]. Another interesting fact about PtSe2 is that it can be grown under relatively low temperatures when compared to other
Summary
Once a forbidden material, one atom thick material came into existence with the discovery of graphene in 2004 by Novoselov et al [1]. The surge of discovery didn’t stop with graphene, it gathered pace, and “2D materials” like h-BN, transition metal dichalcogenides (TMDCs), and several other layered materials came into existence This present work deals with one of the less explored TMDCs, i.e. PtSe2. In bilayer PtSe2, two prominent peaks are observed which are centred at 179 and 207 cm−1 These peaks are associated with first order phonon emission of in-plane and out of plane vibrational modes i.e. Eg and A1g modes. This low intensity peak arises due to the longitudinal optical mode and can be separated into two vibrations These two vibrations correspond to first order two phonon emission for out of plane (A2u) and in plane (Eu) vibrations of Pt and Se atoms [14]. The differences between theoretically derived (previously discussed) phonon modes and experimentally recorded ones can be attributed to the fact that PtSe2 layers are not pristine with definite thickness [15]
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
