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Proposition of atomic and close-to-atomic scale manufacturing

Advances in manufacturing 2024年第1期12卷 1-5页

作者： Ju‑Fan Zhang Jens Ducree School of Mechanical and Materials Engineering University College DublinDublin 4Ireland School of Physical Sciences Dublin City UniversityDublinIreland

Atomic and close-to-atomic scale manufacturing(ACSM)is the core competence of manufacturing *** other conceptions or terminologies that only focus on the atomic level precision,ACSM defnes a new realm of manufacturing where quantum mechanics plays the dominant role in the atom/molecule addition,migration and removal,considering the uncertainty principle and the discrete nature of *** ACSM is still in its infant stage,only little has been systematically elaborated at the core proposition of ACSM by now,hence there is a need to understand its concept and *** article elucidates the development of ACSM and clarifes its proposition,which aims to achieve a clearer understanding on ACSM and direct more efective eforts toward this promising area.

关键词： Atomic and close-to-atomic scale manufacturing(ACSM) Atomic Precision manufacturing Paradigm manufacturing iii

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Laser machining fundamentals:micro,nano,atomic and close-to-atomic scales

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International Journal of Extreme manufacturing 2023年第1期5卷 125-151页

作者： Jinshi Wang Fengzhou Fang Haojie An Shan Wu Huimin Qi Yuexuan Cai Guanyu Guo State Key Laboratory of Precision Measuring Technology&Instruments Laboratory of Micro/Nano Manufacturing Technology(MNMT)Tianjin UniversityTianjin 300072People’s Republic of China Centre of Micro/Nano manufacturing Technology(MNMT-Dublin) University College DublinDublin4Ireland

With the rapid development in advanced industries,such as microelectronics and optics sectors,the functional feature size of devises/components has been decreasing from micro to nanometric,and even ACS for higher performance,smaller volume and lower energy *** this time,a great many quantum structures are proposed,with not only an extreme scale of several or even single atom,but also a nearly ideal lattice structure with no material *** is almost no doubt that such structures play critical role in the next generation products,which shows an urgent demand for the *** machining is one of the most important approaches widely used in engineering and scientific *** is high-efficient and applicable for most kinds of ***,the processing scale covers a huge range from millimeters to nanometers,and has already touched the atomic ***–material interaction mechanism,as the foundation of laser machining,determines the machining accuracy and surface *** becomes much more sophisticated and dominant with a decrease in processing scale,which is systematically reviewed in this *** general,the mechanisms of laser-induced material removal are classified into ablation,CE and atomic desorption,with a decrease in the scale from above microns to *** effects of processing parameters on both fundamental material response and machined surface quality are discussed,as well as theoretical methods to simulate and understand the underlying *** at nanometric to atomic scale are provided,which demonstrate the capability of laser machining in achieving the ultimate precision and becoming a promising approach to ACSM.

关键词： laser machining mechanism atomic and close-to-atomic scale manufacturing ACSM manufacturing iii

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Crystallographic orientation effect on cutting-based single atomic layer removal

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Frontiers of Mechanical Engineering 2020年第4期15卷 631-644页

作者： Wenkun XIE Fengzhou FANG Centre of Micro/Nano manufacturing Technology(MNMT-Dublin) University College DublinDublin 4Ireland State Key Laboratory of Precision Measuring Technology and Instruments Centre of Micro/Nano Manufacturing Technology(MNMT)Tianjin UniversityTianjin 300072China

The ever-increasing requirements for the scalable manufacturing of atomic-scale devices emphasize the significance of developing atomic-scale manufacturing technology. The mechanism of a single atomic layer removal in cutting is the key basic theoretical foundation for atomic-scale mechanical cutting. Material anisotropy is among the key decisive factors that could not be neglected in cutting at such a scale. In the present study, the crystallographic orientation effect on the cutting-based single atomic layer removal of monocrystalline copper is investigated by molecular dynamics simulation. When undeformed chip thickness is in the atomic scale, two kinds of single atomic layer removal mechanisms exist in cutting-based single atomic layer removal, namely, dislocation motion and extrusion, due to the differing atomic structures on different crystallographic planes. On close-packed crystallographic plane, the material removal is dominated by the shear stress-driven dislocation motion, whereas on non-close packed crystallographic planes, extrusion-dominated material removal dominates. To obtain an atomic, defect-free processed surface, the cutting needs to be conducted on the close-packed crystallographic planes of monocrystalline copper.

关键词： ACSM single atomic layer removal mecha-nism crystallographic orientation effect mechanical cutting manufacturing iii

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Periodic energy decomposition analysis for electronic transport studies as a tool for atomic scale device manufacturing

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International Journal of Extreme manufacturing 2020年第1期2卷 164-172页

作者： Paven Thomas Mathew Fengzhou Fang Centre of Micro/Nano manufacturing Technology MNMT-DublinUniversity College DublinIreland State Key Laboratory of Precision Measuring Technology and Instruments Centre of Micro/Nano Manufacturing TechnologyMNMTTianjin UniversityPeople’s Republic of China

Atomic scale manufacturing is a necessity of the future to develop atomic scale devices with high precision.A different perspective of the quantum realm,which includes the tunnelling effect,leakage current at the atomic-scale,Coulomb blockade and Kondo effect,is inevitable for the fabrication and hence,the mass production of these *** these atomic-scale device development,molecular level devices must be *** theoretical studies could be an aid towards the experimental *** transport studies are the basis to realise and interpret the problems happening at this minute *** these in mind,we present a periodic energy decomposition analysis(pEDA)of two potential candidates for moletronics:phthalocyanines and porphyrins,by placing them over gold substrate cleaved at the(111)plane to study the adsorption and interaction at the interface and then,to study their application as a channel between two electrodes,thereby,providing a link between pEDA and electronic transport *** provides information regarding the bond strength and the contribution of electrostatic energy,Pauli’s energy,orbital energy and the orbital *** this analysis with electronic transport studies can provide novel directions for atomic/close-toatomic-scale manufacturing(ACSM).Literature survey shows that this is the first work which establishes a link between pEDA and electronic transport studies and a detailed pEDA study on the above stated *** results show that among the molecules studied,porphyrins are more adsorbable over gold substrate and conducting across a molecular junction than phthalocyanines,even though both molecules show a similarity in adsorption and conduction when a terminal thiol linker is attached.A further observation establishes the importance of attractive terms,which includes interaction,orbital and electrostatic energies,in correlating the pEDA study with the transport *** progressing this re

关键词： phthalocyanine porphyrin potential energy decomposition analysis potential energy surface scan moletronics ACSM manufacturing iii

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