Several strong peaks at 13.6 o , 41.7 o , and 56.9 o from the (002), (006), and (008) planes indicate a high crystallinity of 2H-WSe2. (c) XRD pattern of 15% V-doped WSe2.

Here, we report on the synthesis of tungsten diselenide (WSe2) nanosheets using an atmospheric pressure chemical vapor deposition technique via the rapid selenization of thin tungsten films.

The single crystal WSe2 is characterized using: XRD: single crystal and powder X-ray diffraction (D8 Venture Bruker and D8 Advance Bruker) EDX: Energy-dispersive X-ray spectroscopy for stoichiometric analysis Raman: 785 nm Raman system Hall measurement: Extraction of charge carrier density and doping in the Van der Pauw geometry.

Aug 27, 2014 · We present in this work a RRS study of samples of WSe 2 with one, two, and three layers (1L, 2L, and 3L), as well as bulk 2H-WSe 2, using up to 20 different laser lines covering the visible range. The first- and second-order Raman features exhibit different resonant behavior, in agreement with the double (and triple) resonance mechanism (s).

Download scientific diagram | (a) XRD patterns of WSe2 NSs with different sizes. XPS spectra of WSe2 NSs (WSe2−Low) for (b) W 4f and W 5p, and (c) Se 3d.

May 4, 2017 · We present in situ high-pressure synchrotron X-ray diffraction (XRD) and Raman spectroscopy study, and electrical transport measurement of single crystal WSe 2 in diamond anvil cells with pressures...

May 1, 2023 · The global structure of the size selected WSe 2 materials was investigated by the X-ray diffraction technique (XRD), while the local structure was determined by using the Synchrotron X-ray Absorption Spectroscopy technique (XAS), and first-principles calculations for further describe the improved HER activity of WSe 2 nanoflakes.

Transition metal dichalcogenide WSe 2 is a layered structure stacked by weak van der Waals forces, where a single Se–W–Se layer has a covalently bonded hexagonal quasi-two-dimensional lattice formation.

Apr 29, 2024 · The two-dimensional (2D) WSe 2 nanostructure was successfully synthesized via the hydrothermal method and subjected to comprehensive characterization using various spectroscopic techniques. X-ray diffraction (XRD) analysis confirmed the formation of nanosheets with a hexagonal crystal structure having a space symmetry of P 63/ mmc.

Fig. 8 (a) Raman spectra of pre-synthesized bulk-WSe2, and nm-scale WSe2 crystals excited with depolarized lasers at 660 nm and 532 nm. (b) Polarized spectra of bulk and nano-WSe2 excited at 660 nm and measured with step-wise rotation of the laser polarization plane with respect to the crystal and polarization direction of the detector (angles ...