Mechanochemical activation of 2D MnPS for sub-attomolar sensing.

Molecular detection is important in biosensing, food safety, and environmental surveillance. The high biocompatibility, superior mechanical stability, and low cost make plasmon-free surface-enhanced Raman scattering (SERS) a promising sensing technique, the ultrahigh sensitivity of which is urgently pursued for realistic applications. As a proof of concept, we report a mechanochemical strategy, which combines the wrinkling and chemical functionalization, to fabricate a plasmon-free SERS platform based on 2D MnPS with a sub-attomolar detection limit.

Controlled Growth of Wafer-Scale Transition Metal Dichalcogenides with a Vertical Composition Gradient for Artificial Synapses with High Linearity.

Artificial synapses are promising for dealing with large amounts of data computing. Great progress has been made recently in terms of improving the on/off current ratio, the number of states, and the energy efficiency of synapse devices. However, the nonlinear weight update behavior of a synapse caused by the uncertain direction of the conductive filament leads to complex weight modulation, which degrades the delivery accuracy of information.

Carrier Trapping in Wrinkled 2D Monolayer MoS for Ultrathin Memory.

Atomically thin two-dimensional (2D) semiconductors are promising for next-generation memory to meet the scaling down of semiconductor industry. However, the controllability of carrier trapping status, which is the key figure of merit for memory devices, still halts the application of 2D semiconductor-based memory. Here, we introduce a scheme for 2D material based memory using wrinkles in monolayer 2D semiconductors as controllable carrier trapping centers.

A Scalable Artificial Neuron Based on Ultrathin Two-Dimensional Titanium Oxide.

A spiking neural network consists of artificial synapses and neurons and may realize human-level intelligence. Unlike the widely reported artificial synapses, the fabrication of large-scale artificial neurons with good performance is still challenging due to the lack of a suitable material system and integration method. Here, we report an ultrathin (less than10 nm) and inch-size two-dimensional (2D) oxide-based artificial neuron system produced by a controllable assembly of solution-processed 2D monolayer TiO nanosheets.

Realization of a non-markov chain in a single 2D mineral RRAM.

The non-Markov process exists widely in thermodymanic process, while it usually requires the packing of many transistors and memories with great system complexity in a traditional device structure to minic such functions. Two-dimensional (2D) material-based resistive random access memory (RRAM) devices have the potential for next-generation computing systems with much-reduced complexity. Here, we achieve a non-Markov chain in an individual RRAM device based on 2D mineral material mica with a vertical metal/mica/metal structure.

Confined van der Waals Epitaxial Growth of Two-Dimensional Large Single-Crystal InSe for Flexible Broadband Photodetectors.

The controllable growth of two-dimensional (2D) semiconductors with large domain sizes and high quality is much needed in order to reduce the detrimental effect of grain boundaries on device performance but has proven to be challenging. Here, we analyze the precursor concentration on the substrate surface which significantly influences nucleation density in a vapor deposition growth process and design a confined micro-reactor to grow 2D InSe with large domain sizes and high quality. The uniqueness of this confined micro-reactor is that its size is ~10-10 times smaller than that of a conventional reactor.

Sprayed, Scalable, Wearable, and Portable NO Sensor Array Using Fully Flexible AgNPs-All-Carbon Nanostructures.

Flexible chemical sensors usually require transfer of prepared layers or whole device onto special flexible substrates and further attachment to target objects, limiting the practical applications. Herein, a sprayed gas sensor array utilizing silver nanoparticles (AgNPs)-all-carbon hybrid nanostructures is introduced to enable direct device preparation on various target objects. The fully flexible device is formed using metallic single-walled carbon nanotubes as conductive electrodes and AgNPs-decorated reduced graphene oxide as sensing layers.

Hybrid graphene/cadmium-free ZnSe/ZnS quantum dots phototransistors for UV detection.

Graphene-based optoelectronic devices have attracted much attention due to their broadband photon responsivity and fast response time. However, the performance of such graphene-based photodetectors is greatly limited by weak light absorption and low responsivity induced by the gapless nature of graphene. Here, we achieved a high responsivity above 10 AW for Ultraviolet (UV) light in a hybrid structure based phototransistor, which consists of CVD-grown monolayer graphene and ZnSe/ZnS core/shell quantum dots.

Lateral multilayer/monolayer MoS heterojunction for high performance photodetector applications.

Inspired by the unique, thickness-dependent energy band structure of 2D materials, we study the electronic and optical properties of the photodetector based on the as-exfoliated lateral multilayer/monolayer MoS heterojunction. Good gate-tunable current-rectifying characteristics are observed with a rectification ratio of 10 at V  = 10 V, which may offer an evidence on the existence of the heterojunction. Upon illumination from ultraviolet to visible light, the multilayer/monolayer MoS heterojunction shows outstanding photodetective performance, with a photoresponsivity of 10 A/W, a photosensitivity of 1.

Organic Dye-Sensitized CHNHPbI Hybrid Flexible Photodetector with Bulk Heterojunction Architectures.

A flexible photodetector based on the bulk heterojunction of an organometallic halide perovskites CHNHPbI and an organic dye Rhodamine B (RhB) has been fabricated via a solution casting process. It showed a high responsivity (R = 43.6 mA/W) to visible lights, short response time (t ≈ 60 ms, t ≈ 40 ms), high on-off ratio (I/I ≈ 287) and satisfactory stability because of its Schottky barrier structure and the dye enhanced light absorption.

A Flexible UV-Vis-NIR Photodetector based on a Perovskite/Conjugated-Polymer Composite.

A lateral photodetector based on the bilayer composite film of a perovskite and a conjugated polymer is reported. It exhibits significantly enhanced responsivity in the UV-vis region and sensitive photoresponse in the near-IR (NIR) region at a low applied voltage. This broadband photodetector also shows excellent mechanical flexibility and improved environmental stability.

NO2-induced performance enhancement of PEDOT:PSS/Si hybrid solar cells with a high efficiency of 13.44.

Unlabelled: Using poly (3,4-ethylene-dioxythiophene): poly(styrenesulfonate) (

Pedot: PSS) as an effective hole collecting layer, high-efficiency

Pedot: PSS/n-Si hybrid solar cells are fabricated and a power conversion efficiency (PCE) of 12.13% is obtained. After being treated by HNO3 vapor, the PCE value of

Pedot: PSS/n-Si hybrid solar cells enhances from 12.