A Monochloro Copper Phthalocyanine Memristor with High‐Temperature Resilience for Electronic Synapse Applications

2020 ◽  
pp. 2006201
Author(s):  
Jia Zhou ◽  
Wen Li ◽  
Ye Chen ◽  
Yen‐Hung Lin ◽  
Mingdong Yi ◽  
...  
Keyword(s):  
High Temperature ◽  
Copper Phthalocyanine ◽  
Electronic Synapse

Copper Phthalocyanine Single-crystal Field-effect Transistors Stable Above 100°C

2006 ◽  
Vol 937 ◽  
Author(s):  
Koichi Yamada ◽  
Jun Takeya ◽  
Kunji Shigeto ◽  
Kazuhito Tsukagoshi ◽  
Yoshinobu Aoyagi ◽  
...  
Keyword(s):  
High Temperature ◽  
Single Crystal ◽  
Crystal Field ◽  
Field Effect ◽  
Copper Phthalocyanine ◽  
Field Effect Transistors ◽  
Measured Temperature ◽  
Field Effect Mobility ◽  
Crystal Field Effect ◽  
Activation Type

ABSTRACTIntrinsic charge transport of copper phthalocyanine single-crystal field-effect transistors is measured as function of temperature up to above 100°C. The conduction of the accumulated carriers shows hopping-type transport, so that the field-effect mobility increases with temperature following activation-type temperature dependence throughout the measured temperature region. Due to excellent material stability at the high temperature, the mobility values are precisely reproduced after the heat cycles.

High temperature molecular magnetism caused by π-electrons: copper phthalocyanine doped with alkaline metals

2005 ◽  
Vol 09 (12) ◽  
pp. 846-851 ◽  
Author(s):  
Eduard G. Sharoyan ◽  
Aram S. Manukyan
Keyword(s):  
High Temperature ◽  
Copper Phthalocyanine ◽  
Double Exchange ◽  
Esr Spectra ◽  
Charge Transfer Complexes ◽  
Ferromagnetic Behavior ◽  
Weiss Temperature ◽  
Alkaline Metals ◽  
Molecular Anions ◽  
Spin Resonance

Electron spin resonance spectra of copper phthalocyanine doped with alkaline metals ( A x CuPc ) have been investigated. The temperature dependence of ESR spectra indicates ferromagnetic behavior. The Curie-Weiss temperature varies from 30 to 115 K depending on the stoichiometry x of the samples. Some particles of polycrystalline samples were attracted to a weak magnet at temperatures slightly higher than 77 K. The observed magnetism is caused by unpaired π-electrons of phthalocyanine anions on the eg doubly degenerated molecular orbital. The observed ferromagnetism can be understood within the framework of the McConnell-2 model proposed for organic ferromagnetic charge-transfer complexes. The high-temperature magnetism in A x CuPc is considered to be a result of the Zener mechanism of double exchange between phthalocyanine molecular anions of different valence.

Synthesis of Substituted Amido Copper Phthalocyanine (Pc) Derivatives for Improved Pigment Application Performance

1999 ◽  
Vol 03 (06) ◽  
pp. 522-529 ◽  
Author(s):  
THOMAS W. B. HEALY ◽  
CIARAN T. EWINS
Keyword(s):  
Mass Spectrometry ◽  
High Temperature ◽  
Thin Layer ◽  
Thin Layer Chromatography ◽  
Phthalic Acid ◽  
Copper Phthalocyanine ◽  
Amine Hydrochloride ◽  
Application Performance ◽  
Alkyl Derivatives ◽  
Layer Chromatography

Substituted amido copper phthalocyanine ( CuPc ) derivatives are being investigated as additives in pigment systems. Propylamido, dodecylamido and octadecylamido copper phthalocyanine have been prepared by reaction of the corresponding amine hydrochloride and the mono (carboxamide) of copper phthalocyanine in a melt reaction. The carboxamide of CuPc was prepared by reaction of phthalic acid and trimellitic acid in a urea melt; reagents were selected to maximize the mono-substituted product. The mono (carboxamide) of CuPc as prepared therefore contained CuPc and a statistical mixture of other CuPc carboxamides; however, the formation of the alkyl derivatives allowed purification by high-temperature thin layer chromatography, which gave good separations, and characterization with MALDI-TOF mass spectrometry. Initial investigations show that these alkyl amido CuPcS , when used in CuPc pigment compositions for paints improve the dispersion rheology and dispersibility/colouring strength.

Influence of Thermo-Mechanical Processing on the Microstructure of Beryllia Dispersed Nickel Alloys

1973 ◽  
Vol 31 ◽  
pp. 184-185
Author(s):  
M.S. Grewal ◽  
S.A. Sastri ◽  
N.J. Grant
Keyword(s):  
High Temperature ◽  
Nickel Alloys ◽  
Thermomechanical Processing ◽  
Cold Work ◽  
High Temperature Strength ◽  
Strengthening Effect ◽  
Mechanical Processing ◽  
Uniform Dispersion ◽  
Oxide Particles ◽  
Nickel Base

Currently there is a great interest in developing nickel base alloys with fine and uniform dispersion of stable oxide particles, for high temperature applications. It is well known that the high temperature strength and stability of an oxide dispersed alloy can be greatly improved by appropriate thermomechanical processing, but the mechanism of this strengthening effect is not well understood. This investigation was undertaken to study the dislocation substructures formed in beryllia dispersed nickel alloys as a function of cold work both with and without intermediate anneals. Two alloys, one Ni-lv/oBeo and other Ni-4.5Mo-30Co-2v/oBeo were investigated. The influence of the substructures produced by Thermo-Mechanical Processing (TMP) on the high temperature creep properties of these alloys was also evaluated.

Application of TEM to Deformation, Wear, and Fracture of Ceramics

1974 ◽  
Vol 32 ◽  
pp. 472-473
Author(s):  
B. J. Hockey
Keyword(s):  
Wear Resistance ◽  
High Temperature ◽  
Mechanical Behavior ◽  
Brittle Materials ◽  
High Temperature Strength ◽  
Wide Range ◽  
Corrosive Environments ◽  
Further Development

Ceramics, such as Al2O3 and SiC have numerous current and potential uses in applications where high temperature strength, hardness, and wear resistance are required often in corrosive environments. These materials are, however, highly anisotropic and brittle, so that their mechanical behavior is often unpredictable. The further development of these materials will require a better understanding of the basic mechanisms controlling deformation, wear, and fracture.The purpose of this talk is to describe applications of TEM to the study of the deformation, wear, and fracture of Al2O3. Similar studies are currently being conducted on SiC and the techniques involved should be applicable to a wide range of hard, brittle materials.

Lattice Imaging of Grain Boundaries in Ceramics

1977 ◽  
Vol 35 ◽  
pp. 114-115
Author(s):  
D. R. Clarke ◽  
G. Thomas
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Silicon Nitride ◽  
Grain Boundaries ◽  
High Temperature Strength ◽  
Current Interest ◽  
Lattice Imaging ◽  
Special Significance ◽  
Structural Applications ◽  
Refractory Ceramics

Grain boundaries have long held a special significance to ceramicists. In part, this has been because it has been impossible until now to actually observe the boundaries themselves. Just as important, however, is the fact that the grain boundaries and their environs have a determing influence on both the mechanisms by which powder compaction occurs during fabrication, and on the overall mechanical properties of the material. One area where the grain boundary plays a particularly important role is in the high temperature strength of hot-pressed ceramics. This is a subject of current interest as extensive efforts are being made to develop ceramics, such as silicon nitride alloys, for high temperature structural applications. In this presentation we describe how the techniques of lattice fringe imaging have made it possible to study the grain boundaries in a number of refractory ceramics, and illustrate some of the findings.

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