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Integrated in-memory sensor and computing of artificial vision system based on reversible bonding transition-induced nitrogen-doped carbon quantum dots (N-CQDs)
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作者 Tianqi Yu Jie Li +5 位作者 Wei Lei Suhaidi Shafe Mohd Nazim Mohtar Nattha Jindapetch Paphavee van Dommelen Zhiwei Zhao 《Nano Research》 SCIE EI CSCD 2024年第11期10049-10057,共9页
Carbon quantum dots (CQDs) have been used in memristors due to their attractive optical and electronic properties, which are considered candidates for brain-inspired computing devices. In this work, the performance of... Carbon quantum dots (CQDs) have been used in memristors due to their attractive optical and electronic properties, which are considered candidates for brain-inspired computing devices. In this work, the performance of CQDs-based memristors is improved by utilizing nitrogen-doping. In contrast, nitrogen-doped CQDs (N-CQDs)-based optoelectronic memristors can be driven with smaller programming voltages (−0.6 to 0.7 V) and exhibit lower powers (78 nW/0.29 µW). The physical mechanism can be attributed to the reversible transition between C–N and C=N with lower binding energy induced by the electric field and the generation of photogenerated carriers by ultraviolet light irradiation, which adjusts the conductivity of the initial N-CQDs to implement resistance switching. Importantly, the convolutional image processing based on various cross kernels is efficiently demonstrated by stable multi-level storage properties. An N-CQDs-based optoelectronic reservoir computing implements impressively high accuracy in both no noise and various noise modes when recognizing the Modified National Institute of Standards and Technology (MNIST) dataset. It illustrates that N-CQDs-based memristors provide a novel strategy for developing artificial vision system with integrated in-memory sensor and computing. 展开更多
关键词 nitrogen-doped carbon quantum dots(N-CQDs) optoelectronic memristor reversible bonding transition convolutional image processing reservoir computing
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A Future Life of Binary Phase Diagrams
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作者 Yuri Ustinovshikov 《Advances in Materials Physics and Chemistry》 CAS 2024年第8期123-136,共14页
The article raises the question of what to do with one of the main achievements of metal science in recent years—binary phase diagrams. These diagrams play a key role in the science of alloys and therefore their reli... The article raises the question of what to do with one of the main achievements of metal science in recent years—binary phase diagrams. These diagrams play a key role in the science of alloys and therefore their reliability must be complete. However, the discovery of the “ordering-separation” phase transition, which showed that in binary alloys at certain temperatures the sign of the chemical interatomic interaction changes (and, consequently, the microstructure changes), forces us to reconsider our ideas about those areas. Currently, these areas are designated on diagrams as areas of a “disordered solid solution.” This article proposes, using transmission electron microscopy, to study all the so-called solid solution regions, and apply the results obtained to the studied regions of the phase diagram. 展开更多
关键词 Phase Transformation “Ordering-Separation” Electronic transition “Ionic Bond Covalent Bond” Binary Phase Diagrams Transmission Electron Microscopy
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Synthesis,Structure and Bonding Feature of New Metallic Zintl Phases RE_3Cu_3Sb_4(RE= Nd ,Sm ,Tb , Dy , Ho) 被引量:1
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作者 赵景泰 宋明虎 +3 位作者 周善康 黄种乐 宓锦校 毛少瑜 《Journal of Rare Earths》 SCIE EI CAS CSCD 1999年第3期228-230,共3页
RE 3Cu 3Sb 4(RE=Nd, Sm, Tb, Dy, Ho) was synthesized by arc melting method and their crystal structures were characterized by powder X ray method. The compounds crystallize in cubic system, Y 3Au 3Sb 4 type, sp... RE 3Cu 3Sb 4(RE=Nd, Sm, Tb, Dy, Ho) was synthesized by arc melting method and their crystal structures were characterized by powder X ray method. The compounds crystallize in cubic system, Y 3Au 3Sb 4 type, space group I43d (No.220), Pearson code cI40. The unit cell parameters are: Nd 3Cu 3Sb 4: a =0 96749(1) nm, V =0 90561(3) nm 3; Sm 3Cu 3Sb 4: a =0 96145(1) nm, V =0 88875(3) nm 3; Tb 3Cu 3Sb 4: a =0 95362(1) nm, V =0 86721(3) nm 3; Dy 3Cu 3Sb 4: a =0 95088(1) nm, V =0 85975(3) nm 3; Ho 3Cu 3Sb 4: a =0 9488(2) nm, V =0 8541(5) nm 3; Z =4. The structures are characterized by covalent bonded Cu Sb tetrahedra which form three dimensional networks by sharing corners. The rare earth atoms are distributed in the cages. The formula with the charge balance can be written as RE 3+ 3Cu 1+ 3Sb 3- 4 which are metallic Zintl phases having the weak metallic conductivity. The bonds have typical transitional features. General atomic coordination environment rules are followed. The unit cell parameters show the lanthanide contraction. 展开更多
关键词 Rare earths ANTIMONIDE Intermetallic compound Metallic Zintl phase Crystal structure transitional bonding
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JOINING MECHANISM OF FIELD-ASSISTED BONDING OF ELECTROLYTE GLASS TO METALS 被引量:2
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作者 Meng Qingsen Xue Jin 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2003年第1期72-74,共3页
Investigations of technological characteristics and bonding mechanism of field-assisted bonding are done, which are for bonding of electrolytes (Pyrex glass) to monocrystal silicon and aluminum. The features of micros... Investigations of technological characteristics and bonding mechanism of field-assisted bonding are done, which are for bonding of electrolytes (Pyrex glass) to monocrystal silicon and aluminum. The features of microstructure and the distribution of the diffused elements in the bonding interface area are studied by means of SEM, EDX and XRD, and the influence of the technological factors on the bonding process is also studied. The model of 'metal-oxides-glass' of bonding structure and ions diffusion and bonding in the condition of electrical field-assisted are indicated. 展开更多
关键词 Glass Metal Field-assisted bonding transitional area
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Field-Induced Structural Transition in the Bond Frustrated Spinel ZnCr2Se4
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作者 陈绪亮 宋文海 杨昭荣 《Chinese Physics Letters》 SCIE CAS CSCD 2015年第12期135-138,共4页
The effect of an external magnetic field on the structural and magnetic properties of bond frustrated ZnCr2 Se4 at low temperatures is investigated using magnetization, dielectric constants and thermal conductivity ex... The effect of an external magnetic field on the structural and magnetic properties of bond frustrated ZnCr2 Se4 at low temperatures is investigated using magnetization, dielectric constants and thermal conductivity experiments. With an increase in the magnetic field H, the antiferromagnetic transition temperature TN is observed to shift progressively toward lower temperatures. The corresponding high temperature cubic (Fd3m) to low temperature tetragonal (I41amd) structural transition is tuned simultaneously due to the inherent strong spin-lattice coupling. In the antiferromagnetic phase, an anomaly at Hc2 defined as a steep downward peak in the derivative of the M-H curve is dearly drawn. It is found that TN versus H and Hc2 versus T exhibit a consistent tendency, indicative of a field-induced tetragonal (I41amd) to cubic (Fd3m) structural transition. The transition is further substantiated by the field-dependent dielectric constant and thermal conductivity measurements. We modify the T-H phase diagram, highlighting the coexistence of the paramagnetic state and ferromagnetic clusters between 100K and TN. 展开更多
关键词 CR Field-Induced Structural transition in the Bond Frustrated Spinel ZnCr2Se4
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Experimental Detection of Diffusion Micro-pairs in a Structure of the Ni_(65)Mo_(20)Cr_(15)Alloy 被引量:1
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作者 Yuri Ustinovshikov 《材料科学与工程(中英文A版)》 2021年第2期63-70,共8页
The article raises the question of how diffusion pairs A/B,A/C,and B/C form in three-component alloys ABC.This issue solves experimentally using the TEM(transmission electron microscopy)method and Ni65Mo20Cr15 alloy.T... The article raises the question of how diffusion pairs A/B,A/C,and B/C form in three-component alloys ABC.This issue solves experimentally using the TEM(transmission electron microscopy)method and Ni65Mo20Cr15 alloy.The quenching of this alloy from a liquid showed that such pairs form in the liquid state of the alloy,and as the quenching temperature decreases,particles of the new phases form inside them.We concluded that not a disordered solid solution after high-temperature quenching“from a region of disordered solid solution at the phase diagrams”is the starting point for the formation of a low-temperature microstructure,but a liquid state,into which the alloy passes during its melting.The author hopes the results got will lead to a reorientation of our ideas about alloys and will change a lot both in the theory of alloys and in the technology of their manufacture. 展开更多
关键词 TEM SUPERALLOYS new phase formation “ordering-phase separation”transition transition“ionic bond↔covalent bond”
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Coordination of neighboring C——H bond to transition metal center——III. Study on localized molecular orbitals of the binucleate ion [Fe_2(CH_3)(CO) (Ph_2pCH_2PPh_2)Cp_2]^+
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作者 CHEN Min-Bo LI Jian XU Guang-Xian 《Acta Chimica Sinica English Edition》 SCIE CAS CSCD 1989年第4期317-323,共1页
A localized INDO method was used to calculate the ion [Fe_2 (CH_3) (CO) (Ph_2PCH_2PPh_2)- Cp_2]^+. Based on the analysis of the localized molecular orbitals (LMO), bond orders and contour maps, it was pointed out that... A localized INDO method was used to calculate the ion [Fe_2 (CH_3) (CO) (Ph_2PCH_2PPh_2)- Cp_2]^+. Based on the analysis of the localized molecular orbitals (LMO), bond orders and contour maps, it was pointed out that the LMO no. 20 corresponds to the coordination of C(1)-H(I) σbond to Fe(2) atom. Non occurrence of metal-metal bond between Fe(1) and Fe(2) atoms was found and the covalence of irons was numerated, which coincides with the value in ref 17. 展开更多
关键词 Fe2 H bond to transition metal center Study on localized molecular orbitals of the binucleate ion Ph2pCH2PPh2)Cp2 CH3 Coordination of neighboring C CO III
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