Tailoring atomic diffusion for in situ fabrication of different heterostructures.

Atomic diffusion has been recognized as a particularly powerful tool in the synthesis of heterostructures. However, controlled atomic diffusion is very difficult to achieve in the fabrication of individual nanostructures. Here, an electrically driven in situ solid-solid diffusion reaction inside a TEM is reported for the controlled fabrication of two different hetero-nanostructures in the Ag-Te system.

Initial stage of MBE growth of MoSe monolayer.

An atomically thin MoSe layer has been synthesized on mica using molecular beam epitaxy (MBE). The polymorphous of the MoSe layer depends on the coverage and the growth temperature. At low coverages and low growth temperature, 1T-MoSe forms in addition to a comparable quantity of 2H-MoSe.

In Situ Observation of Crystalline Silicon Growth from SiO at Atomic Scale.

The growth of crystalline Si (c-Si) via direct electron beam writing shows promise for fabricating Si nanomaterials due to its ultrahigh resolution. However, to increase the writing speed is a major obstacle, due to the lack of systematic experimental explorations of the growth process and mechanisms. This paper reports a systematic experimental investigation of the beam-induced formation of c-Si nanoparticles (NPs) from amorphous SiO under a range of doses and temperatures by in situ transmission electron microscopy at the atomic scale.

Novel Interface in CuAg Nanostructure Induced by Size Effect.

Bimetallic Janus nanostructures (JNs) have been revealed to be valuable materials because they have unique intermetallic interfaces that enable their potential use in a range of applications. However, with the increasing miniaturization of electronic devices, particle sizes influence the structure and orientation of these heterointerfaces, which plays a significant role in their application. Our in situ annealing experiments with high-resolution transmission electron microscopy have shown that for particle sizes in the sub-10 nm range, CuAg JNs preferentially show a Cu(100)/Ag(100) interface, differing from the larger CuAg JNs, where the Cu(111)/Ag(111) interface is favored.

Spring-Like Pseudoelectroelasticity of Monocrystalline CuS Nanowire.

Prediction from the dual-phase nature of superionic conductors-both solid and liquid-like-is that mobile ions in the material may experience reversible extraction-reinsertion by an external electric field. However, this type of pseudoelectroelasticity has not been confirmed in situ, and no details on the microscopic mechanism are known. Here, we in situ monitor the pseudoelectroelasticity of monocrystalline CuS nanowires (NWs) using transmission electron microscopy (TEM).

Atomic Scale Modulation of Self-Rectifying Resistive Switching by Interfacial Defects.

Higher memory density and faster computational performance of resistive switching cells require reliable array-accessible architecture. However, selecting a designated cell within a crossbar array without interference from sneak path currents through neighboring cells is a general problem. Here, a highly doped n Si as the bottom electrode with Ni-electrode/HfO /SiO asymmetric self-rectifying resistive switching device is fabricated.

A Novel Domain-Confined Growth Strategy for In Situ Controllable Fabrication of Individual Hollow Nanostructures.

The manipulation and tailoring of the structure and properties of semiconductor nanocrystals (NCs) is significant particularly for the design and fabrication of future nanodevices. Here, a novel domain-confined growth strategy is reported for controllable fabrication of individual monocrystal hollow NCs (h-NCs) in situ inside a transmission electron microscope, which enables the atomic scale monitoring of the entire reaction. During the process, the preformed carbon shells serve as nanoreaction cells for the formation of CdSeS h-NCs.

Electrically driven cation exchange for in situ fabrication of individual nanostructures.

Cation exchange (CE) has been recognized as a particularly powerful tool for the synthesis of heterogeneous nanocrystals. At present, CE can be divided into two categories, namely ion solvation-driven CE reaction and thermally activated CE reaction. Here we report an electrically driven CE reaction to prepare individual nanostructures inside a transmission electron microscope.

Dynamics of soil available phosphorus and its impact factors under simulated climate change in typical farmland of Taihu Lake region, China.

Global climate change affects the availability of soil nutrients, thereby influencing crop productivity. This research was conducted to investigate the effects of elevated CO2, elevated temperature, and the interaction of the elevated CO2 and temperature on the soil available phosphorus (P) of a paddy-wheat rotation in the Taihu Lake region, China. Winter wheat (Triticum aestivum L.