High Anisotropic Optoelectronics in Monolayer Binary M₈X₁₂ (M = Mo, W; X = S, Se, Te)

Abstract

Exploring high performance and excellent ambient stability in two-dimensional (2D) monolayer photoelectric materials is motivated by not only practical applications but also scientific interest. Here, a new 2D monolayer W8Se12 structure is synthesized via in situ electron-beam irradiation on 2D WSe2. Moreover, we systematically studied the photoelectric properties of the class of monolayer M8X12 (M = Mo, W; X = S, Se, and Te) materials by first principles. The results indicated that Mo8S12, Mo8Se12, W8S12, and W8Se12 monolayers possess desirable direct band gaps and remarkable anisotropic optical absorption in visible light, while Mo8Te12 and W8Te12 monolayers are metals. Impressively, the monolayer W8Se12 can result in a direct–indirect-metal transition under uniaxial strain. In addition, they show high anisotropic carrier mobilities (up to 104 cm2 V–1 s–1), significantly over those of transition-metal dichalcogenides. These new binary monolayer M8X12 structures can effectively broaden the 2D material family and may provide four potential candidates in photoelectric applications.

Bridging Evolution of the Solvation Sheath to Rigid‐Soft Coupling and Low‐Resistance Solid Electrolyte Interface for Fast‐Charging and Ultrastable Bi Anode

“…B) Ultralong cycling performance at 2.6 C. D) Cycling performances and C,E) the corresponding discharge–charge curves of Bi/Bi 2 O 3 @C anode at 5.2 C. F) Ultralong cycling performance at 7.8 C. G) A comparison of the volumetric capacity of Bi/Bi 2 O 3 @C composites with other representative anodes reported (a, [ 16 ] b, [ 17 ] c, [ 18 ] d [ 19 ] ). H) A comparison of the capacity of Bi/Bi 2 O 3 @C composites with other Bi‐based anodes reported (a, [ 3c ] b, [ 11a ] c, [ 11b ] d, [ 11c ] e [ 20 ] ).…”

“…To our knowledge, the Bi anode, protected by the multifunctional SEI structure, exhibits the unprecedented electrochemical cycling stability (94.4% capacity retention at 2.6 C after 1000 cycles and 89.6% capacity retention at 5.2 C after 1300 cycles) among the reported Bi‐based LIB anodes. [ 3c,11 ] In addition, when the Bi anode is coupled with LiFePO 4 cathode, this full cell delivers a superior capacity retention of 85.2% at 0.6 C after 100 cycles with coulombic efficiencies approaching 100% from the 2nd cycle, which is better than previously reported Bi‐based full cells (≈60% capacity retention after 90 cycles with unsatisfactory coulombic efficiencies (≈90–95%) in the initial ten cycles). [ 7 ] This research not only facilitates constructing the stable alloying Bi anodes for next‐generation and low‐cost energy storage systems, but also provides a new way for designing multifunctional SEI layer used in other high‐volume‐expansion electrodes.…”

Self‐Assembled Peptide‐Based Nanodrugs: Molecular Design, Synthesis, Functionalization, and Targeted Tumor Bioimaging and Biotherapy

“…demonstrated the synthesis of lipoic acid (LA)‐modified PEG‐modified MoS 2 , which was further functionalized with pH‐responsive charge‐switching peptide LA‐K11 as cancer therapeutic application. [ 109 ] MoS 2 acted as a carrier and a photothermal agent in the synthesized composite, and the positively charged photosensitizer, toluidine blue O (TBO), was conjugated onto MoS 2 by physisorption. Under acidic conditions, LA‐K11 (LA‐GKKKKKKKKKKK‐NH 2 ) was converted from negatively charged to positively charged, which was then released due to the effect of repulsion and competition.…”

High mobility and excellent thermoelectric performance monolayer ZnX2Z4 (X = In, Al, Ga; Z = S, Se, Te) materials

“…BP has an appropriate direct band gap and high carrier mobility, but it is prone to oxidative degradation in air, which seriously hinders its application. 15 Besides, many other 2D layered optoelectronic materials have been experimentally synthesized, including the synthesis of ultrathin (2.4 nm) layered PbSnS 2 by a vapor deposition process (CVD), 16 transition metal chalcogenides (GeS, SnS, InSe, GaSe 2 , and W 8 Se 12 ) [17][18][19][20][21] and Ti 2 C; 22 these corresponding monolayer structures exhibit suitable band gaps and ultra-high carrier mobilities (up to B10 4 cm 2 V À1 s À1 ). Furthermore, BP and other 2D monolayer (KAgSe, SeSn, TlO 2 , MgIn 2 Se 4 , and BaIn 2 Te 4 ) [23][24][25][26][27] have been reported to have good thermoelectric properties with relatively high ZT values.…”