scholarly journals Physical mechanisms involved in the formation and operation of memory devices based on a monolayer of gold nanoparticle-polythiophene hybrid materials

2019 ◽  
Vol 1 (7) ◽  
pp. 2718-2726
Author(s):  
T. Zhang ◽  
D. Guérin ◽  
F. Alibart ◽  
D. Troadec ◽  
D. Hourlier ◽  
...  
Keyword(s):  
Gold Nanoparticle ◽  
Hybrid Materials ◽  
Memory Device ◽  
Memory Devices ◽  
Resistive Memory ◽  
Forming Process ◽  
Chemical Mechanisms ◽  
Physical Mechanisms ◽  
Physical And Chemical

Understanding the physical and chemical mechanisms occurring during the forming process and operation of an organic resistive memory device is a requisite for better performance.

scholarly journals Changes in Optical Properties upon Dye–Clay Interaction: Experimental Evaluation and Applications

Nanomaterials ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 197
Author(s):  
Giorgia Giovannini ◽  
René M. Rossi ◽  
Luciano F. Boesel
Keyword(s):  
Optical Properties ◽  
Hybrid Materials ◽  
High Performance ◽  
Fluorescent Properties ◽  
Chemical Mechanisms ◽  
Strong Electrostatic Interaction ◽  
Potential Applications ◽  
Photochemical Properties ◽  
Physical And Chemical ◽  
The Relationship

The development of hybrid materials with unique optical properties has been a challenge for the creation of high-performance composites. The improved photophysical and photochemical properties observed when fluorophores interact with clay minerals, as well as the accessibility and easy handling of such natural materials, make these nanocomposites attractive for designing novel optical hybrid materials. Here, we present a method of promoting this interaction by conjugating dyes with chitosan. The fluorescent properties of conjugated dye–montmorillonite (MMT) hybrids were similar to those of free dye–MMT hybrids. Moreover, we analyzed the relationship between the changes in optical properties of the dye interacting with clay and its structure and defined the physical and chemical mechanisms that take place upon dye–MMT interactions leading to the optical changes. Conjugation to chitosan additionally ensures stable adsorption on clay nanoplatelets due to the strong electrostatic interaction between chitosan and clay. This work thus provides a method to facilitate the design of solid-state hybrid nanomaterials relevant for potential applications in bioimaging, sensing and optical purposes.

Experimental and Theoretical Investigation of Minimization of Forming-Induced Variability in Resistive Memory Devices

2015 ◽  
Vol 1729 ◽  
pp. 53-58
Author(s):  
Brian L. Geist ◽  
Dmitri Strukov ◽  
Vladimir Kochergin
Keyword(s):  
Metal Oxide ◽  
Diffusion Processes ◽  
Memory Device ◽  
Device Fabrication ◽  
Oxide Material ◽  
Memory Devices ◽  
Resistive Memory ◽  
Conductive Filament ◽  
Metal Metal ◽  
Metal Oxide Layer

ABSTRACTResistive memory materials and devices (often called memristors) are an area of intense research, with metal/metal oxide/metal resistive elements a prominent example of such devices. Electroforming (the formation of a conductive filament in the metal oxide layer) represents one of the often necessary steps of resistive memory device fabrication that results in large and poorly controlled variability in device performance. In this contribution we present a numerical investigation of the electroforming process. In our model, drift and Ficks and Soret diffusion processes are responsible for movement of vacancies in the oxide material. Simulations predict filament formation and qualitatively agreed with a reduction of the forming voltage in structures with a top electrode. The forming and switching results of the study are compared with numerical simulations and show a possible pathway toward more repeatable and controllable resistive memory devices.

Flexible nonvolatile resistive memory devices based on SrTiO3 nanosheets and polyvinylpyrrolidone composites

2017 ◽  
Vol 5 (37) ◽  
pp. 9799-9805 ◽  
Author(s):  
Guilin Chen ◽  
Peng Zhang ◽  
Lulu Pan ◽  
Lin Qi ◽  
Fucheng Yu ◽  
...  
Keyword(s):  
Memory Effect ◽  
Resistive Switching ◽  
Memory Device ◽  
Memory Devices ◽  
Resistive Memory ◽  
Resistive Switching Memory ◽  
Switching Memory

A non-volatile resistive switching memory effect was observed in flexible memory device based on SrTiO3 nanosheets and polyvinylpyrrolidone composites.

A solution processed metal–oxo cluster for rewritable resistive memory devices

2019 ◽  
Vol 7 (4) ◽  
pp. 843-852 ◽  
Author(s):  
Kui Zhou ◽  
Guanglong Ding ◽  
Chen Zhang ◽  
Ziyu Lv ◽  
Shenghuang Luo ◽  
...  
Keyword(s):  
Activation Energy ◽  
Resistive Switching ◽  
Memory Device ◽  
Memory Devices ◽  
Resistive Memory ◽  
Solution Processed ◽  
Switching Behaviour

A memory device based on metal–oxo cluster-assembled materials demonstrates a redox-based resistive switching behaviour which is correlated with the migration of hydroxide ions with low activation energy.

scholarly journals Memory Devices: In Situ Tuning of Switching Window in a Gate-Controlled Bilayer Graphene-Electrode Resistive Memory Device (Adv. Mater. 47/2015)

2015 ◽  
Vol 27 (47) ◽  
pp. 7766-7766 ◽  
Author(s):  
He Tian ◽  
Haiming Zhao ◽  
Xue-Feng Wang ◽  
Qian-Yi Xie ◽  
Hong-Yu Chen ◽  
...  
Keyword(s):  
Memory Device ◽  
Bilayer Graphene ◽  
Memory Devices ◽  
Resistive Memory ◽  
Graphene Electrode

Flicker Noise Behavior in Resistive Memory Devices With Double-Layered Transition Metal Oxide

2013 ◽  
Vol 34 (2) ◽  
pp. 244-246 ◽  
Author(s):  
Jung-Kyu Lee ◽  
Sunghun Jung ◽  
Byeong-In Choe ◽  
Jinwon Park ◽  
Sung-Woong Chung ◽  
...  
Keyword(s):  
Transition Metal ◽  
Metal Oxide ◽  
Flicker Noise ◽  
Transition Metal Oxide ◽  
Memory Devices ◽  
Resistive Memory ◽  
Layered Transition Metal

The Varied Causes of Color in Glass

1985 ◽  
Vol 61 ◽  
Author(s):  
K. Nassau
Keyword(s):  
Chalcogenide Glasses ◽  
Water Ligand ◽  
Ligand Field ◽  
Energy Bands ◽  
Metal Compounds ◽  
Chemical Mechanisms ◽  
Doped Glasses ◽  
Blue Eyes ◽  
Physical And Chemical ◽  
Ice Water

ABSTRACTAll but two of the fifteen physical and chemical mechanisms which are necessary to explain all the varied causes of color apply in one way or another to glass. These fifteen causes of color derive from a variety of physical and chemical mechanisms and are summarized in five groups with concentration on those mechanisms that apply to glass and the related glazes and enamels. Vibrations and simple excitations explain the colors of incandescence (e.g. flames, hot glass), gas excitations (neon tube, aurora), and vibrations and rotations (blue ice, water, glasses based on water). Ligand field effect colors are seen in transition metal compounds (turquoise, chrome oxide green, glasses based on copper sulfate) and impurities (ruby, emerald, many doped glasses). Molecular orbitals explain the colors of organic compounds (indigo, chlorophyll, organic glasses) and charge transfer compounds (blue sapphire, lapis lazuli, “beer-bottle” brown and chromate glasses). Energy bands are involved in the colors of metals and alloys (gold, brass, glassy metals), of semiconductors (cadmium yellow, vermillion, chalcogenide glasses), doped semiconductors (blue and yellow diamond), and color centers (amethyst, topaz, irradiated glass). Geometrical and physical optics are involved in the colors derived from dispersive refraction (rainbow, green flash, glass prism spectrum), scattering (blue sky, blue eyes, red sunset, ruby gold and opal glasses), interference (soap bubbles, iridescent beetles, cracks in glasses, interference filters), and diffraction (the corona aureole, diffraction grating spectrum).

Integrating Multiple Resistive Memory Devices on a Single Carbon Nanotube

2013 ◽  
Vol 23 (45) ◽  
pp. 5631-5637 ◽  
Author(s):  
David Brunel ◽  
Costin Anghel ◽  
Do-Yoon Kim ◽  
Saïd Tahir ◽  
Stéphane Lenfant ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Memory Devices ◽  
Resistive Memory
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