The different Raman vibrational modes and phonon calculation based on the density functional theory (DFT) were performed to understand the stability of the 1T '-WSe2 phase. The flower-like 1T '-WSe2 nanosheet shows better catalytic activity for the hydrogen evolution reaction (HER) with an ...
过渡金属硫化物的新型1T′晶相在HER电催化反应中具有优异的性能,但是1T′晶相容易转变为更加稳定的2H晶相,这降低了催化活性和稳定性。 有鉴于此,西北工业大学刘正清副教授、西安交通大学曲晓艳副教授等报道首先合成Cu1.94S@TMDs异质结,包括1T′-MoS2, Mo...
(eV) 1T' WSe2 2H WSe2 53 0.8 B B' A 0.6 0.4 0.5 0.0 Orthorhombic 1T' (Pnm21) Monoclinic 1T' (P21/m) 10 20 30 40 2 (degrees) 1 0 100 150 200 250 300 Raman shift (cm–1) 0.2 0.0 300 400 500 600 700 800 900 1000 Wavelength (nm) Fig. 2 1T' to 2H phase ...
然后,他们利用合成的4H-Au纳米线作为模板,在其表面通过湿化学方法实现了四种1T′-TMD单层(包括WS2、WSe2、MoS2和MoSe2)的准外延生长,形成了4H-Au@1T′-TMD核壳型纳米线。在图1中,a部分展示了准外延生长的示意图。b部分是典型的4H-Au@1T′-WS2纳米线的HAADF-STEM图像,显示WS2单层均匀生长在4H-Au纳米线上。
实现了单层1T′相TMDs (包括WS2、WSe2、MoS2和MoSe2)在4H相Au上的准外延生长[12]. 这类单层1T′相TMDs不仅具有超高的相纯度(~100%), 还表现出优异的热稳定性. 本方法合成的4H-Au@1T′-TMD核-壳结构还可用于超灵敏表面增强拉曼散射(surface-enhanced Raman scattering, SERS)检测. 相关研究成果发表于Nature...
Two-dimensional (2D) MoS2, which has great potential for optoelectronic and other applications, is thermodynamically stable and hence easily synthesized in its semiconducting 2H phase. In contrast, growth of its metastable 1T and 1T′ phases is hampered
Finally, as far as the two type-III bilayers are concerned, 1T-SnSe2/2H-WSe2and 1T-ZrS2/2H-WSe2, both present a shift in the valence band of about ~0.3 eV, with an analogous shift of ~0.3 eV found in the conduction band of 1T-ZrS2/2H-WSe2. Such large deviation is not unexpec...
The Mott-Schottky analysis used 0.5 M Na2SO4 as the electrolyte with Ag/AgCl (3.5 M KCl) reference electrode and Pt counter electrode at 1.0 kHz. The working electrodes were prepared by drop-casting the catalysts. Raman analysis was performed using a Raman spectrometer, Nicolet Almega XR (...
Dynamic tuning of terahertz atomic lattice vibration via cross-scale mode coupling to nanomechanical resonance in WSe2membranes Using a custom-built setup capable of simultaneously detecting Raman and motional signals, we accomplish cross-scale mode coupling between the THz crystal ... Bo Xu,Zejuan ...
Here we report that 4H-Au nanowires (NWs), when used as templates, can induce the quasi-epitaxial growth of high-phase-purity and stable 1T′-TMD MLs, including WS2, WSe2, MoS2and MoSe2, via a facile and rapid wet-chemical method. The as-synthesized 4H-Au@1T′-TMD core–shell NWs ...