Two-dimensional (2D) transition-metal dichalcogenides (TMDs) have emerged as promising capacitive materials for supercapacitor devices owing to their intrinsically layered structure and large surface areas. Hierarchically integrating 2D TMDs with other functional nanomaterials has recently been pursued improve electrochemical performances; however, it often suffers from limited cyclic stabilities capacitance losses due the poor structural integrity at interfaces of randomly assembled...

Neuromorphic visual systems emulating biological retina functionalities have enormous potential for in-sensor computing, with prospects of making artificial intelligence ubiquitous. Conventionally, information is captured by an image sensor, stored memory units, and eventually processed the machine learning algorithm. Here, we present optoelectronic synapse device multifunctional integration all processes required real time object identification. Ultraviolet–visible wavelength-sensitive MoS2...

Phase-change materials undergo rapid and reversible crystalline-to-amorphous structural transformation are being used for nonvolatile memory devices. However, the mechanism remains poorly understood. We have studied effect of electrical pulses on phase change in a single-crystalline Ge(2)Sb(2)Te(5) (GST) nanowire device by situ transmission electron microscopy. show that produce dislocations crystalline GST, which become mobile glide direction hole-carrier motion. The continuous increase...

Abstract Two-dimensional (2D) van der Waal (vdW) heterostructures composed of vertically-stacked multiple transition metal dichalcogenides (TMDs) such as molybdenum disulfide (MoS 2 ) and tungsten (WS are envisioned to present unprecedented materials properties unobtainable from any other material systems. Conventional fabrications these hybrid have relied on the low-yield manual exfoliation stacking individual 2D TMD layers, which remain impractical for scaled-up applications. Attempts...

Transition metal dichalcogenide (TMDC) monolayers are considered to be potential materials for atomically thin electronics due their unique electronic and optical properties. However, large-area uniform growth of TMDC with large grain sizes is still a considerable challenge. This report presents simple but effective approach large-scale highly crystalline molybdenum disulfide using solution-processed precursor deposition. The low supersaturation level, triggered by the evaporation an...

Two-dimensional (2D) transition-metal dichalcogenides (2D TMDs) in the form of MX2 (M: transition metal, X: chalcogen) exhibit intrinsically anisotropic layered crystallinity wherein their material properties are determined by constituting M and X elements. 2D platinum diselenide PtSe2) is a relatively unexplored class TMDs with noble-metal Pt as M, offering distinct advantages over conventional such higher carrier mobility lower growth temperatures. Despite projected promise, much its...

We first report that two-dimensional (2D) metal (NbSe2)-semiconductor (WSe2)-based flexible, wearable, and launderable gas sensors can be prepared through simple one-step chemical vapor deposition of prepatterned WO3 Nb2O5. Compared to a control device with Au/WSe2 junction, gas-sensing performance the 2D NbSe2/WSe2 was significantly enhanced, which might have resulted from formation NbxW1-xSe2 transition alloy junction lowering Schottky barrier height. This would make it easier collect...

With the ever-increasing demand for low power electronics, neuromorphic computing has garnered huge interest in recent times. Implementing hardware will be a severe boost applications involving complex processes such as image processing and pattern recognition. Artificial neurons form critical part circuits, have been realized with complementary metal-oxide-semiconductor (CMOS) circuitry past. Recently, metal-insulator-transition materials used to realize artificial neurons. Although...

A globally imminent shortage of freshwater has been demanding viable strategies for improving desalination efficiencies with the adoption cost- and energy-efficient membrane materials. The recently explored 2D transition metal dichalcogenides (2D TMDs) near atomic thickness have envisioned to offer notable advantages as high-efficiency membranes owing their structural uniqueness; that is, extremely small intrinsic porosity. Despite theoretically projected advantages, experimental realization...

In this work, we use a two-terminal 2D MoS <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> -based memristive device to emulate an artificial neuron. The Au/MoS /Ag exhibits volatile resistance switching characteristics with low threshold voltage and high ON-OFF ratio of 10 <sup xmlns:xlink="http://www.w3.org/1999/xlink">6</sup> , originating from Ag diffusion-based filamentary process. leaky integrate-and-fire neuron implemented...

Recent advancements in MoS2 nanofilms have aided the development for important water-related environmental applications. However, a nanofilm-coated sensor has yet to been applied heavy metal detection samples. In this study, novel vertically aligned two-dimensional (2D) (edge exposed) nanofilm was situ lead ion (Pb2+) detection. The developed showed an excellent linear relationship toward Pb2+ between 0 and 20 ppb at −0.45 V vs Ag/AgCl using square wave anodic stripping voltammetry (SWASV)...

Brain-inspired computing enabled by memristors has gained prominence over the years due to nanoscale footprint and reduced complexity for implementing synapses neurons. The demonstration of complex neuromorphic circuits using conventional materials systems been limited high cycle-to-cycle device-to-device variability. Two-dimensional (2D) have used realize transparent, flexible, ultra-thin memristive computing, but with knowledge on statistical variation devices. In this work, we demonstrate...

Heterostructures of compositionally and electronically variant two-dimensional (2D) atomic layers are viable building blocks for ultrathin optoelectronic devices. We show that the composition interfacial transition region between semiconducting WSe2 layer channels metallic NbSe2 contact can be engineered through doping with Nb atoms. WxNb1-xSe2 regions considerably lower potential barrier height junction, significantly improving performance corresponding WSe2-based field-effect transistor...

Two-dimensional transition-metal dichalcogenide (2D TMD) layers are highly attractive for emerging stretchable and foldable electronics owing to their extremely small thickness coupled with extraordinary electrical optical properties. Although intrinsically large strain limits projected in them (i.e., several times greater than silicon), integrating 2D TMDs pristine forms does not realize superior mechanical tolerance greatly demanded high-end devices of unconventional form factors. In this...

Platinum diselenide (PtSe2) is an emerging class of two-dimensional (2D) transition-metal dichalcogenide (TMD) crystals recently gaining substantial interest, owing to its extraordinary properties absent in conventional 2D TMD layers. Most interestingly, it exhibits a thickness-dependent semiconducting-to-metallic transition, i.e., thick PtSe2 layers, which are intrinsically metallic, become semiconducting with their thickness reduced below certain point. Realizing both and metallic phases...

Abstract Two-dimensional (2D) transition metal dichalcogenide (2D TMD) layers present an unusually ideal combination of excellent opto-electrical properties and mechanical tolerance projecting high promise for a wide range emerging applications, particularly in flexible stretchable devices. The prerequisite realizing such opportunities is to reliably integrate large-area 2D TMDs well-defined dimensions on mechanically pliable materials with targeted functionalities by transferring them from...

Emulating the human brain's circuitry composed of neurons and synapses is an emerging area research in mitigating “von Neumann bottleneck” present computer architectures. The building block these neuromorphic systems—the synapse—is commonly realized with oxide-based or phase change material-based devices, whose operation limited by high programming currents reset currents. In this work, we have nonvolatile resistive switching MoS2/graphene devices that exhibit multiple conductance states at...

Platinum ditelluride (PtTe2) is an emerging semimetallic two-dimensional (2D) transition-metal dichalcogenide (TMDC) crystal with intriguing band structures and unusual topological properties. Despite much devoted efforts, scalable controllable synthesis of large-area 2D PtTe2 well-defined layer orientation has not been established, leaving its projected structure-property relationship largely unclarified. Herein, we report a low-temperature growth layers on area greater than few square...

Herein, first, we synthesize a multifunctional photocatalyst via metal oxides loaded (Co/Pd) on acid-treated TiO2 nanorods (ATO) and further introduce hydrogen annealing treatment. The treatment introduces converted into bimetallic form delays the photogenerated charge recombination process. Also, oxygen vacancies are formed due to partial reduction of Ti4+ Ti3+ sites. In addition, help improve photocatalytic degradation antibacterial activity. hydrogen-treated (Pd(1)Co(1)/ATO (red))...

Abstract Memristors for neuromorphic computing have gained prominence over the years implementing synapses and neurons due to their nano-scale footprint reduced complexity. Several demonstrations show two-dimensional (2D) materials as a promising platform realization of transparent, flexible, ultra-thin memristive synapses. However, unsupervised learning in spiking neural network (SNN) facilitated by linearity symmetry synaptic weight update has not been explored thoroughly using 2D...

Abstract Two-dimensional molybdenum disulfide (2D MoS 2 ) presents extraordinary optical, electrical, and chemical properties which are highly tunable by engineering the orientation of constituent 2D layers. films with vertically-aligned layers exhibit numerous edge sites predicted to offer superior reactivity owing their enriched dangling bonds. This enhanced coupled band gap energy can render vertical unique opportunities for environmental applications that go beyond conventional...

Abstract Although theoretical studies and experimental investigations have demonstrated the presence of space-charge-induced dopant segregation, most work has been confined largely to crystal-free surface some special grain boundaries, best our knowledge there no systematic comparison understand how segregation varies at different types interfaces in polycrystals. Here, through atomic-column resolved scanning transmission electron microscopy real polycrystalline samples, we directly...

The development of highly efficient flexible transparent electrodes (FTEs) supported on polymer substrates is great importance to the realization portable and bendable photovoltaic devices. Highly conductive, low-cost Cu has attracted attention as a promising alternative for replacing expensive indium tin oxide (ITO) Ag. However, efficient, Cu-based FTEs are currently unavailable because absence an means attaining atomically thin, completely continuous film that simultaneously exhibits...

Two-dimensional (2D) platinum diselenide (PtSe2) layers are a new class of near-atom-thick 2D crystals in van der Waals-assembled structure similar to previously explored many other transition-metal dichalcogenides (2D TMDs). They exhibit distinct advantages over conventional TMDs for electronics and optoelectronics applications such as metallic-to-semiconducting transition, decently high carrier mobility, low growth temperature. Despite superiority, much their electrical properties have...