Growth of WS2 flakes on Ti3C2Tx Mxene Using Vapor Transportation Routine

Abstract

Two-dimensional dichalcogenides (TMDs) and mxene junctions had been predicted to possess distinct tunable electronic properties. However, direct synthesis of WS 2 on Ti 3 C 2 T x mxene is still challenging. Herein, we successfully deposited WS 2 onto the surface of Ti 3 C 2 T x mxene by employing the vapor transportation (VT) routine. By modulating pressure and source-sample distance, multilayer and monolayer (1 L) WS 2 flakes were deposited onto the lateral side and top surface of Ti 3 C 2 T x flakes. The 1 L WS 2 flakes growing on lateral side of Ti 3 C 2 T x flake have much higher photoluminescence (PL) intensity than 1 L flakes growing on the top surface. Our study has the potential to benefit the design and preparation of novel electronic and electrochemical devices based on TMDs/mxene junctions.

Enhancing Nonradiative Energy Transfer between Nitridized Carbon Quantum Dots and Monolayer WS2

“…The peak position of the prominent peak located at 417 cm –1 (assigned to A 1 ′ mode) agrees well with the reported value for 1L-WS 2 . , In the PL spectrum (Figure S4b), a strong single PL peak is found at 619 nm (corresponding to the A exciton), indicating the PL transition of the direct band structure of 1L-WS 2 . , An atomic force microscopy (AFM) topographic image of an uncoated flake is shown in Figure S4c. The typical height is determined to be 0.73 nm from the height profile along a dashed line across the edge and agrees well with the reported typical height of 1L-WS 2 . These Raman, PL, and AFM features signify that the flakes with light purple contrast are indeed 1L-WS 2 .…”

Stoichiometry-Modulated Resonant Raman Spectroscopy of WS2(1–x)Se2x-Alloyed Monolayer Nanosheets

“…The flake thickness can be determined to be ∼1 nm, which agrees with the reported thickness of the alloyed 1L flakes, indicating that the mauve flakes are 1Ls . The white particles outside the flake can be tentatively assigned to the usually seen nanocrystallites grown during the VT deposition. , …”

“…19 The white particles outside the flake can be tentatively assigned to the usually seen nanocrystallites grown during the VT deposition. 42,43 The PL spectra of all the WS 2(1−x) Se 2x 1L samples excited by 532 and 488 nm lasers are presented in Figure 2a,b, respectively. At the excitation laser wavelength of 532 nm, the pure WS 2 and WSe 2 flakes present single-wavelet PL peaks with energies centered at 1.95 and 1.6 eV, respectively, indicating A excitonic transition and verifying the 1L nature of these mauve flakes.…”

Atypical Defect-Mediated Photoluminescence and Resonance Raman Spectroscopy of Monolayer WS2

“…The AFM topographic images of samples T1–T4 are shown in Figure S2d–f of the Supporting Information and Figure c, respectively. A large number of nanocrystals can be seen on the surface of these four samples, which is a common feature in VT-deposited WS 2 and WSe 2 . Line profiles across the edges along the marked positions are shown as insets in the corresponding topographic images.…”