Status and Prospects of ZnO-Based Resistive Switching Memory Devices

In the advancement of the semiconductor device technology, ZnO could be a prospective alternative than the other metal oxides for its versatility and huge applications in different aspects. In this review, a thorough overview on ZnO for the application of resistive switching memory (RRAM) devices has been conducted. Various efforts that have been made to investigate and modulate the switching characteristics of ZnO-based switching memory devices are discussed. The use of ZnO layer in different structure, the different types of filament formation, and the different types of switching including complementary switching are reported. By considering the huge interest of transparent devices, this review gives the concrete overview of the present status and prospects of transparent RRAM devices based on ZnO. ZnO-based RRAM can be used for flexible memory devices, which is also covered here. Another challenge in ZnO-based RRAM is that the realization of ultra-thin and low power devices. Nevertheless, ZnO not only offers decent memory properties but also has a unique potential to be used as multifunctional nonvolatile memory devices. The impact of electrode materials, metal doping, stack structures, transparency, and flexibility on resistive switching properties and switching parameters of ZnO-based resistive switching memory devices are briefly compared. This review also covers the different nanostructured-based emerging resistive switching memory devices for low power scalable devices. It may give a valuable insight on developing ZnO-based RRAM and also should encourage researchers to overcome the challenges

Synthesis, characterization, and properties of silicon (IV) compounds containing <i>N,N'</i>-symmetrically alkyl substituted 1,3-diketimine ligands and their potential as CVD precursor material

<p></p> <p>A family of silicon (IV) compounds containing <i>N,N'</i>-symmetrically alkyl substituted 1,3-diketimine ligands as chemical vapor deposition (CVD) precursors for silicon-based films has been reported and characterized by ¹H, ¹³C, and ²⁹Si NMR, EI-MS and elemental analysis where necessary. The compounds were synthesized by reaction of corresponding lithium salt of the diketimine ligands and SiMe₃Cl according to a general procedure. Theoretical simulation was performed in order to understand their structures. Thermal stability, transport behavior and vapor pressures were evaluated by simultaneous thermal analyses (STA). Chemical vapor deposition was accomplished in a hot wall CVD reactor system to further demonstrate the ability of these compounds as CVD precursors. Characterization (SEM and XPS) of the as-grown films proved that the family indeed possesses the potential to fabricate silicon-based films with compact and uniform structure.</p

Synthesis, characterization, and thermal properties of silicon(IV) compounds containing amidinate ligands as CVD precursors

<p>The title compounds of the type R-C(=N^<i>i</i>Pr) (-N′ ^<i>i</i>PrSiMe₃) (with R = Me or ^<i>n</i>Bu) as potential chemical vapor deposition (CVD) precursors have been synthesized and characterized by ¹H, ¹³C, and ²⁹Si NMR spectroscopy as well as by EI-MS and elemental analysis where necessary. Thermal properties, including stability, volatility, transport behavior, and vapor pressure, were evaluated by thermogravimetric analysis to confirm that they are suitable for the CVD procedure. Deposition was accomplished in a hot wall CVD reactor system, which qualitatively verified the ability of these compounds as CVD precursors.</p

Survey of ship platoon cooperative control

The ship platoon will become an important form of water transport in the future. This paper analyzes the characteristics and control principle of ship platoon cooperative control, and analyzes the current situation and methods in the four aspects of ship-shore cooperative platoon, platoon control model, platoon motion control and typical platoon applications. The current bottlenecks of ship platoon control technology are summarized, including human-machine fusion control, platoon motion control uncertainty modeling, platoon cooperative consistency control modeling, robust control under communication constraints and consistency control. In the future development of ship platoons, we should focus on solving the problems of platoon motion modeling based on data-driven and mechanism fusion, ship platoon control based on the biological group mechanism and the application of hierarchical control in ship platoon control

Synthesis of two aminosilanes as CVD precursors of SiC_xN_y films: Tuning film composition by Molecular Structures

<p></p> <p>Two aminosilanes derived from hexamethyldisilazane as chemical vapor deposition (CVD) precursors for SiC_xN_y and relevant films have been reported and characterized by ¹H, ¹³C, and ²⁹Si NMR as well as by EI-MS and elemental analysis, where necessary. Thermal stability, transport behavior and vapor pressures were evaluated by simultaneous thermal analyses (STA). Chemical vapor deposition was accomplished in a hot wall CVD reactor system to further demonstrate the ability of these compounds as CVD precursors. Most importantly, characterization (XPS) of the as-grown films proved that the composition of the films can be controlled by the molecular structure of the precursors. The result suggests future strategy for the design of CVD precursors for SiC_xN_y and related films.</p

Mesenchymal stem cells and porous β-tricalcium phosphate composites prepared through stem cell screen-enrich-combine(−biomaterials) circulating system for the repair of critical size bone defects in goat tibia

Abstract Background Efficacious bone substitute is essential for the treatment of a critical size bone defect. Currently, the bone substitutes commonly used in clinical practice lack osteogenic capacity and the therapeutic efficacy is not ideal. Herein, a novel stem cell screen-enrich-combine(−biomaterials) circulating system (SECCS) was introduced to provide the substitutes with osteogenic ability. The stem cell screening, enrichment, and recombination with substitutes could be integrated during the surgical operation. Using SECCS, the bioactive mesenchymal stem cells (MSCs) and porous β-tricalcium phosphate (β-TCP) composites (MSCs/β-TCP) were rapidly prepared for critical size bone defect repair and validated in goat models of critical size tibia defects. Methods Twelve goats with right hind limb tibia defects of 30 mm were randomly divided into two groups: six (the experimental group) were treated with MSCs/β-TCP prepared by SECCS and the other six goats (the control group) were treated with pure porous β-TCP. The repair effect was assessed by x-ray, computed tomography (CT), micro-CT, histology and histomorphology 6 months after the operation. In addition, the enrichment efficacy of MSCs and the characteristics of the MSCs/β-TCP prepared by SECCS were evaluated. Results The SECCS could compound about 81.3 ± 3.0% of the MSCs in bone marrow to the porous β-TCP without affecting the cell viability. The average number of MSCs for retransplantation was 27,655.0 ± 5011.6 for each goat from the experimental group. In vitro, satisfactory biocompatibility of the MSCs/β-TCP was performed, with the MSCs spreading adequately, proliferating actively, and retaining the osteogenic potential. In vivo, the defect repair by MSCs/β-TCP with good medullary cavity recanalization and cortical remodeling was significantly superior to that of pure porous β-TCP. Conclusions The MSCs/β-TCP prepared through SECCS demonstrated significant therapeutic efficacy in goat models of critical size bone defect. This provides a novel therapeutic strategy for critical size bone defects caused by severe injury, infection, and bone tumor resection with a high profile of safety, effectiveness, simplicity, and ease