The loss of sulfur cathode material as a result polysulfide dissolution causes significant capacity fading in rechargeable lithium/sulfur cells. Here, we use chemical approach to immobilize and lithium polysulfides via the reactive functional groups on graphene oxide. This enabled us obtain uniform thin (around tens nanometers) coating oxide sheets by simple reaction-deposition strategy subsequent low-temperature thermal treatment process. Strong interaction between or demonstrate cells with...

A graphene/n‐type silicon (n‐Si) heterojunction has been demonstrated to exhibit strong rectifying behavior and high photoresponsivity, which can be utilized for the development of high‐performance photodetectors. However, graphene/n‐Si photodetectors reported previously suffer from relatively low specific detectivity due large dark current. Here, by introducing a thin interfacial oxide layer, current reduced two orders magnitude at zero bias. At room temperature, photodetector with exhibits...

Abstract To address the urgent need for clean and sustainable energy, rapid development of hydrogen‐based technologies has started to revolutionize use earth‐abundant noble‐metal‐free catalysts hydrogen evolution reaction (HER). Like active sites hydrogenases, cation pyrite‐type transition‐metal dichalcogenides have been suggested be in HER. Herein, we synthesized electrodes based on a Se‐enriched NiSe 2 nanosheet array explored relationship between anion improved activity through...

The atomic layer of hybridized hexagonal boron nitride (h-BN) and graphene has attracted a great deal attention after the pioneering work P. M. Ajayan et al. on Cu foils because their unusual electronic properties (Ci, L. J.; Nat. Mater. 2010, 9, 430-435). However, many fundamental issues are still not clear, including in-plane continuity as well edge type at boundary h-BN domains. To clarify these issues, we have successfully grown perfect single-layer h-BN-graphene (BNC) patchwork selected...

Using first-principles GW Bethe-Salpeter equation calculations and the k·p theory, we unambiguously show that for two-dimensional (2D) semiconductors, there exists a robust linear scaling law between quasiparticle band gap (E_{g}) exciton binding energy (E_{b}), namely, E_{b}≈E_{g}/4, regardless of their lattice configuration, bonding characteristic, as well topological property. Such parameter-free universality is never observed in three-dimensional counterparts. By deriving simple...

Abstract Two-dimensional metallic transition metal dichalcogenides are emerging as prototypes for uncovering fundamental physical phenomena, such superconductivity and charge-density waves, well engineering-related applications. However, the batch production of envisioned remains challenging, which has hindered aforementioned explorations. Herein, we fabricate thickness-tunable tantalum disulfide flakes centimetre-sized ultrathin films on an electrode material gold foil via a facile chemical...

Interest in wearable and stretchable multifunctional sensors has grown rapidly recent years. The sensing elements must accurately detect external stimuli to expand their applicability as sensors. However, the sensor's self-healing adhesion a target object have been major challenges developing such practical versatile devices. In this study, we prepared hydrogel (LM-SA-PAA) composed of liquid metal (LM), sodium alginate (SA), poly(acrylic acid) (PAA) with ultrastretchable, excellent...

We report a high-performance field-effect transistor (FET) and phototransistor based on back-gated multilayer GaTe nanosheets. Through both electrical transport measurements at variable temperatures first-principles calculations, we find Ga ion vacancy is the critical factor that causes high off-state current, low on/off ratio, large hysteresis of FET room temperature. By suppressing thermally activated defects liquid nitrogen temperature, nanosheet with ratio ∼10(5), current ∼10(-12) A,...

Abstract Developing low‐cost, highly efficient, and robust earth‐abundant electrocatalysts for hydrogen evolution reaction (HER) is critical the scalable production of clean sustainable fuel through electrochemical water splitting. This study presents a facile approach synthesis nanostructured pyrite‐phase transition metal dichalcogenides as active, catalysts in production. Iron disulfide (FeS 2 ) nanoparticles are situ loaded stabilized on reduced graphene oxide (RGO) current‐induced...

For increasing scalability and reducing cost, transition metal dichalcogenides‐based electrocatalysts presently have been proposed as substitutes for noble metals to generate hydrogen, but these alternatives usually suffer from inferior performance. Here, a Ravenala leaf‐ like W x C@WS 2 heterostructure is grown via carbonizing WS nanotubes, whose outer walls being partially unzipped along with the C “leaf‐valves” attached inner tubes during carbonization process. This exhibits catalytic...

In-plane heterostructure of hexagonal boron nitride and graphene (h-BN-G) has become a focus research owing to its tunable bandgap intriguing properties. We report herein the synthesis quasi-freestanding h-BN-G monolayer on weakly coupled Ir(111) substrate, where h-BN possess distinctly different heights surface corrugations. An atomically sharp zigzag type boundary been found dominate patching interface between h-BN, as evidenced by high-resolution Scanning tunneling microscopy...

Abstract The existence of defects in 2D semiconductors has been predicted to generate unique physical properties and markedly influence their electronic optoelectronic properties. In this work, it is found that the monolayer MoS 2 prepared by chemical vapor deposition nearly defect‐free after annealing under ultrahigh vacuum conditions at ≈400 K, as evidenced scanning tunneling microscopy observations. However, thermal process ≈900 dominant single sulfur vacancies relatively rare vacancy...

Contribution of a $d$ electron to ferroelectricity type-II multiferroics causes strong magnetoelectric coupling and distinguishes them from the conventional type-I multiferroics. However, their therein polarization is too small because merely derivative magnetic order. Here we report class multiferroic materials, monolayer $\mathrm{VO}{X}_{2}$ ($X=\mathrm{Cl}$, Br, I), which combine advantages Both magnetism arise same V cation, where filled orbital perpendicular an priori ferroelectric thus...

We study the feasibility of alkali-metal (AM = Li, Na, K)-doped B80 fullerenes for hydrogen storage using first-principles calculations. It is found that AM atoms are strongly attached at centers pentagons B80, forming B80AMm complexes (1 ≤ m 12). This bonding can be attributed to charge transfer between and fullerenes, such as case C60AM. The redistribution induces an electric field mainly around positively charged atoms, which polarizes H2 molecules but does not make them dissociate....

Abstract To address the urgent need for clean and sustainable energy, rapid development of hydrogen‐based technologies has started to revolutionize use earth‐abundant noble‐metal‐free catalysts hydrogen evolution reaction (HER). Like active sites hydrogenases, cation pyrite‐type transition‐metal dichalcogenides have been suggested be in HER. Herein, we synthesized electrodes based on a Se‐enriched NiSe 2 nanosheet array explored relationship between anion improved activity through...

Dendritic patterns generated in non‐equilibrium growth processes are prevalent nature while their formation mechanisms far from fully understood. Here, we report a coverage‐dependent fractal degree evolution of monolayer 2H‐MoS 2 dendrites synthesized on symmetry‐disparate substrate SrTiO 3 (001). Surprisingly, various characterizations have revealed that the featured with orthogonal backbones single crystalline, possessing both peculiar adlayer‐substrate interaction and abnormal indirect...

A unique cage growth of graphene is developed by using carbon nanotube (CNT) spider webs as porous templates, resulting in CNT/graphene hybrids with high conductivity and mechanical flexibility. Furthermore, monolithic all-carbon transistors active elements contacts interconnects are directly formed chemical synthesis, flexible bioelectronics subsequently demonstrated for vivo mapping cardiac signals.

It is highly desirable to integrate graphene into existing semiconductor technology, where the combined system thermodynamically stable yet maintain a Dirac cone at Fermi level. Firstprinciples calculations reveal that certain transition metal (TM) intercalated graphene/SiC(0001), such as strongly-bound graphene/intercalated-Mn/SiC, could be system. Different from free-standing graphene, hybridization between and Mn/SiC leads formation of dispersive primarily TM d characters. The...

The prospect of a Dirac half metal, material which is characterized by bandstructure with gap in one spin channel but cone the other, both fundamental interest and natural candidate for use spin-polarized current applications. However, while possibility such has been reported based on model calculations[H. Ishizuka Y. Motome, Phys. Rev. Lett. 109, 237207 (2012)], it remains unclear what system might realize an exotic state. Using first-principles calculations, we show that experimentally...

During graphene growth on various transition metals in the periodic table, metal carbides always emerge to behave as complex intermediates. On VIII metals, metastable usually evolve and then transform into along phase interfaces, even no can form IB-IIB metals. In contrast, during group IVB-VIB are generated before evolution of stably exist throughout whole process. However, for remaining e.g., VIIB, located between VIII, interplay carbide is still vague. Herein, Re(0001) (VIIB), we have...

While various excitonic insulators have been studied in the literature, due to perceived too-small spin splitting, spin-triplet insulator is rare. In two-dimensional systems such as a semihydrogenated graphene (known graphone), however, it possible, revealed by first-principles calculations coupled with Bethe-Salpeter equation. The critical temperature, given an effective Hamiltonian, 11.5 K. detecting still daunting challenge, condensation of triplet excitons will result superfluidity,...