The development of intrinsic ferromagnetism in two-dimensional (2D) limit is at the core of ultra-compact spintronic applications. However, direct synthesis of non-layered 2D magnets with strong ferromagnetic order is still in infancy. Here we report the phasecontrollable synthesis of trigonal and monoclinic Cr5Te8 flakes via a facile chemical vapor deposition route. Both phases exhibit robust ferromagnetism with strong perpendicular anisotropy down to a few nanometers, as confirmed by both magneto-optical and 2 magnetotransport measurements. High Curie temperature up to 200 K is obtained by manipulating the phase structure and thickness. Remarkably, a colossal anomalous Hall effect is observed in the more distorted monoclinic Cr5Te8 with an enhanced anomalous Hall conductivity of 650 Ω -1 cm -1 and anomalous Hall angle of 5% achieved simultaneously. Our work paves the way for the scalable synthesis of 2D magnetic materials and highlights the great potential of Cr5Te8 for engineering future spintronic devices.

Knowing the correlation of reaction parameters in the preparing process of carbon dots (CDs) is essential for optimizing the synthesis strategy, exploring exotic properties, and exploiting potential applications. However, the integrated screening experimental data on the synthesis of CDs are huge and noisy. Machine learning (ML) has recently been successfully used

No abstract

Compared with 2D S-based and Se-based transition metal dichalcogenides (TMDs), Te-based TMDs display much better electrical conductivities, which will be beneficial to enhance the capacitances in supercapacitors. However, to date, the reports about the applications of Te-based TMDs in supercapacitors are quite rare. Herein, the first supercapacitor example of the Te-based TMD is reported: the type-II Weyl semimetal 1Td WTe . It is demonstrated that single crystals of 1Td WTe can be exfoliated into the nanosheets with 2-7 layers by liquid-phase exfoliation, which are assembled into air-stable films and further all-solid-state flexible supercapacitors. The resulting supercapacitors deliver a mass capacitance of 221 F g and a stack capacitance of 74 F cm . Furthermore, they also show excellent volumetric energy and power densities of 0.01 Wh cm and 83.6 W cm , respectively, superior to the commercial 4V/500 µAh Li thin-film battery and the commercial 3V/300 µAh Al electrolytic capacitor, in association with outstanding mechanical flexibility and superior cycling stability (capacitance retention of ≈91% after 5500 cycles). These results indicate that the 1Td WTe nanosheet is a promising flexible electrode material for high-performance energy storage devices.

Epitaxial synthesis of monolayer PtSe2 single crystal on MoSe2 with strong interlayer coupling