scholarly journals Dimensional transformation of chemical bonding during crystallization in a layered chalcogenide material

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Yuta Saito ◽  
Shogo Hatayama ◽  
Yi Shuang ◽  
Paul Fons ◽  
Alexander V. Kolobov ◽  
...  
Keyword(s):  
Chemical Bonding ◽  
Crystalline Phase ◽  
Three Dimensional ◽  
Atomic Layer ◽  
Unusual Behavior ◽  
Weakly Bound ◽  
Covalently Bonded ◽  
Non Volatile Memory ◽  
Device Applications ◽  
Memory Applications

AbstractTwo-dimensional (2D) van der Waals (vdW) materials possess a crystal structure in which a covalently-bonded few atomic-layer motif forms a single unit with individual motifs being weakly bound to each other by vdW forces. Cr2Ge2Te6 is known as a 2D vdW ferromagnetic insulator as well as a potential phase change material for non-volatile memory applications. Here, we provide evidence for a dimensional transformation in the chemical bonding from a randomly bonded three-dimensional (3D) disordered amorphous phase to a 2D bonded vdW crystalline phase. A counterintuitive metastable “quasi-layered” state during crystallization that exhibits both “long-range order and short-range disorder” with respect to atomic alignment clearly distinguishes the system from conventional materials. This unusual behavior is thought to originate from the 2D nature of the crystalline phase. These observations provide insight into the crystallization mechanism of layered materials in general, and consequently, will be useful for the realization of 2D vdW material-based functional nanoelectronic device applications.

scholarly journals Hysteresis Behavior of the Donor–Acceptor-Type Ambipolar Semiconductor for Non-Volatile Memory Applications

Micromachines ◽  
2021 ◽  
Vol 12 (3) ◽  
pp. 301
Author(s):  
Young Jin Choi ◽  
Jihyun Kim ◽  
Min Je Kim ◽  
Hwa Sook Ryu ◽  
Han Young Woo ◽  
...  
Keyword(s):  
Organic Semiconductor ◽  
Field Effect ◽  
Field Effect Transistor ◽  
Memory Device ◽  
Non Volatile Memory ◽  
Device Applications ◽  
Donor Acceptor ◽  
Effect Transistor ◽  
Volatile Memory ◽  
Memory Applications

Donor–acceptor-type organic semiconductor molecules are of great interest for potential organic field-effect transistor applications with ambipolar characteristics and non-volatile memory applications. Here, we synthesized an organic semiconductor, PDPPT-TT, and directly utilized it in both field-effect transistor and non-volatile memory applications. As-synthesized PDPPT-TT was simply spin-coated on a substrate for the device fabrications. The PDPPT-TT based field-effect transistor showed ambipolar electrical transfer characteristics. Furthermore, a gold nanoparticle-embedded dielectric layer was used as a charge trapping layer for the non-volatile memory device applications. The non-volatile memory device showed clear memory window formation as applied gate voltage increases, and electrical stability was evaluated by performing retention and cycling tests. In summary, we demonstrate that a donor–acceptor-type organic semiconductor molecule shows great potential for ambipolar field-effect transistors and non-volatile memory device applications as an important class of materials.

Plasma Enhanced Atomic Layer Deposited HfO2 Ferroelectric Films for Non-volatile Memory Applications

2019 ◽  
Vol 49 (2) ◽  
pp. 1445-1453
Author(s):  
Rajesh Kumar Jha ◽  
Prashant Singh ◽  
Manish Goswami ◽  
B. R. Singh
Keyword(s):  
Atomic Layer ◽  
Ferroelectric Films ◽  
Non Volatile Memory ◽  
Volatile Memory ◽  
Memory Applications

Atomic-Layer Deposition of Lutetium Aluminate Thin Films for Non-Volatile Memory Applications

2019 ◽  
Vol 34 (1) ◽  
pp. 473-478 ◽  
Author(s):  
Christoph Adelmann ◽  
Johan Swerts ◽  
Thierry Conard ◽  
Bert Brijs ◽  
Alexis Franquet ◽  
...  
Keyword(s):  
Thin Films ◽  
Atomic Layer Deposition ◽  
Atomic Layer ◽  
Layer Deposition ◽  
Non Volatile Memory ◽  
Volatile Memory ◽  
Memory Applications

scholarly journals Hemp (Cannabis sativa L.) Seed Protein–EGCG Conjugates: Covalent Bonding and Functional Research

Foods ◽  
2021 ◽  
Vol 10 (7) ◽  
pp. 1618
Author(s):  
Xin-Hui Pang ◽  
Yang Yang ◽  
Xin Bian ◽  
Bing Wang ◽  
Li-Kun Ren ◽  
...  
Keyword(s):  
Particle Size ◽  
Fluorescence Spectroscopy ◽  
Cannabis Sativa ◽  
Three Dimensional ◽  
Epigallocatechin Gallate ◽  
Particle Size Analysis ◽  
Size Analysis ◽  
Particle Size Data ◽  
Covalently Bonded ◽  
Covalently Linked

In order to make HPI have a wide application prospect in the food industry, we used EGCG to modify HPI. In this study, we prepared different concentrations (1, 2, 3, 4, and 5 mM) of (−)-epigallocatechin gallate (EGCG) covalently linked to HPI and use methods such as particle size analysis, circular dichroism (CD), and three-dimensional fluorescence spectroscopy to study the changes in the structure and functional properties of HPI after being covalently combined with EGCG. The particle size data indicated that the covalent HPI-EGCG complex was larger than native HPI, and the particle size was mainly distributed at about 200 μm. CD and three-dimensional fluorescence spectroscopy analyses showed that the conformation of the protein was changed by conjugation with EGCG. The β-sheet content decreased from 82.79% to 66.67% after EGCG bound to the protein, and the hydrophobic groups inside the protein were exposed, which increased the hydrophobicity of the protein and changed its conformation. After HPI and 1 mM of EGCG were covalently bonded, the solubility and emulsifying properties of the covalent complex were improved compared with native HPI. These results indicated that HPI-EGCG conjugates can be added in some foods.

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