A facile strategy for the growth of high-quality tungsten disulfide crystals mediated by oxygen-deficient oxide precursors

Abstract

Chemical vapor deposition (CVD) has been established as a versatile route for the large-scale synthesis of transition metal dichalcogenides, such as tungsten disulfide (WS2).

Boron Nitride/Ti3C2Tx MXene Nanosheet/WS2 Nanostructure Ternary Composites for All-Solid-State Flexible Asymmetric Supercapacitors

“…Here, Ti–F and Ti–O bonds indicate the surface groups of Ti 3 C 2 T x . The C 1s spectrum is shown in Figure h, showing peaks with binding energies of 283.3, 284.78, 286.0, 287.6, and 286.76 eV, which are attributed to C–Ti, C–C, C–N, and C–O bonds, respectively. , The W 4f region (Figure i) exhibits the characteristics W 4+ doublets at 35.3 and 37.4 eV, representing W 4f 7/2 and W 4f 5/2 peaks, respectively, along with W 6+ doublets at 34.0 and 36.3 eV. , The exposed W 4f peaks are well indexed as the 2H phase of WS 2 . Additionally, the broad peak at 40.7 eV is assigned to W 5p 3/2 .…”

“…The C 1s spectrum is shown in Figure h, showing peaks with binding energies of 283.3, 284.78, 286.0, 287.6, and 286.76 eV, which are attributed to C–Ti, C–C, C–N, and C–O bonds, respectively. , The W 4f region (Figure i) exhibits the characteristics W 4+ doublets at 35.3 and 37.4 eV, representing W 4f 7/2 and W 4f 5/2 peaks, respectively, along with W 6+ doublets at 34.0 and 36.3 eV. , The exposed W 4f peaks are well indexed as the 2H phase of WS 2 . Additionally, the broad peak at 40.7 eV is assigned to W 5p 3/2 . For the S 2p spectrum (Figure j), the peaks at 160.7 and 162.4 eV correspond to 2p 3/2 and 2p 1/2 states, respectively, signifying the existence of S 2– and S 2 2– groups, respectively, in WS 2 , establishing the existence of the M–S bond.…”

“…Additionally, the broad peak at 40.7 eV is assigned to W 5p 3/2 . 54 For the S 2p spectrum (Figure 4j), the peaks at 160.7 and 162.4 eV correspond to 2p 3/2 and 2p 1/2 states, respectively, signifying the existence of S 2− and S 2 2− groups, respectively, in WS 2 , establishing the existence of the M−S bond. Further, the broad peaks at 168.3 and 169.68 eV are assigned to the oxidized sulfur (sulfite and sulfate) species, which are generated because of atmospheric oxygen.…”

“…The corelevel B 1s XPS pattern exhibited in Figure 4e 52,53 The W 4f region (Figure 4i) exhibits the characteristics W 4+ doublets at 35.3 and 37.4 eV, representing W 4f 7/2 and W 4f 5/2 peaks, respectively, along with W 6+ doublets at 34.0 and 36.3 eV. 16,54 The exposed W 4f peaks are well indexed as the 2H phase of WS 2 . Additionally, the broad peak at 40.7 eV is assigned to W 5p 3/2 .…”

Molybdenum Disulfide Nanoribbons with Enhanced Edge Nonlinear Response and Photoresponsivity

“…PLD is a versatile tool that allows a broad tunability of the precursor uniformity, thickness, and stoichiometry, the latter by varying the oxygen content. [28,29] In the second step, the precursor oxide films coated with alkali metal halide (NaF) are sulfurized in an S-rich atmosphere. In contrast to the conventional CVD, our approach allows decoupling evaporation from the growth processes.…”