Raman characterization of platinum diselenide thin films

Abstract

and duesberg@tcd.ie Platinum diselenide (PtSe 2 ) is a newly discovered 2D material which is of great interest for applications in electronics and catalysis. PtSe 2 films were synthesized by thermally-assisted selenization of predeposited platinum films and scanning transmission electron microscopy revealed the crystal structure of these films to be 1T. Raman scattering of these films was studied as a function of film thickness, laser wavelength and laser polarization. E g and A 1gRaman active modes were identified using polarization measurements in the Raman setup.These modes were found to display a clear position and intensity dependence with film thickness, for multiple excitation wavelengths, and their peak positions agree with simulated phonon dispersion curves for PtSe 2 . These results highlight the practicality of using Raman spectroscopy as a prime characterization technique for newly-synthesized 2D materials.

Large‐area high quality PtSe2 thin film with versatile polarity

“…The observed shift is similar to other TMDCs, such as MoS 2 , which can be attributed to the Coulombic interactions and possible stacking‐induced changes of the interlayer bonding . The A 1g peak's relative intensity also increases and the ratio of A 1g /E g shows a clear change from 0.3 to 1.1 because of the increased van der Waals interactions for more layers . (Figure S2D).…”

“…We also explored the thickness dependent Raman shift . In Figure B, atomic force microscopy (AFM) reveals the 2D feature and the thickness of PtSe 2 on the SiO 2 /Si substrate.…”

“…We also explored the thickness dependent Raman shift. 29,30 In Figure 2B, atomic force microscopy (AFM) reveals the 2D feature and the thickness of PtSe 2 on the SiO 2 / F I G U R E 2 The characterization of PtSe 2 film. A, Raman spectra of PtSe 2 films on different substrate, insets are vibration models of E g and A1 g Raman active modes.…”

“…31 The A 1g peak's relative intensity also increases and the ratio of A 1g /E g shows a clear change from 0.3 to 1.1 because of the increased van der Waals interactions for more layers. 29 ( Figure S2D).…”

PtSe 2 grown directly on polymer foil for use as a robust piezoresistive sensor

“…PtSe 2 thin films were grown on polyimide substrates by a TAC process as depicted in Figure 1(a) and described in more detail in our previous reports [7][8] . Substrates were typically ~2 cm x 4 cm in area, as shown in Figure 1(b), but larger or smaller substrates could readily be made.…”