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Nedelcu, Mihaela,Saifullah, Mohammad S. M.,Hasko, David G.,Jang, Arang,Anderson, David,Huck, Wilhelm T. S.,Jones, Geraint A. C.,Welland, Mark E.,Kang, Dae Joon,Steiner, Ullrich WILEY-VCH Verlag 2010 Advanced Functional Materials Vol.20 No.14
<P>The fabrication of very narrow metal lines by the lift-off technique, especially below sub-10 nm, is challenging due to thinner resist requirements in order to achieve the lithographic resolution. At such small length scales, when the grain size becomes comparable with the line-width, the built-in stress in the metal film can cause a break to occur at a grain boundary. Moreover, the line-width roughness (LWR) from the patterned resist can result in deposited metal lines with a very high LWR, leading to an adverse change in device characteristics. Here a new approach that is not based on the lift-off technique but rather on low temperature hydrogen reduction of electron-beam patterned metal naphthenates is demonstrated. This not only enables the fabrication of sub-10 nm metal lines of good integrity, but also of low LWR, below the limit of 3.2 nm discussed in the International Technology Roadmap for Semiconductors. Using this method, sub-10 nm nickel wires are obtained by reducing patterned nickel naphthenate lines in a hydrogen-rich atmosphere at 500 °C for 1 h. The LWR (i.e., 3 σ<SUB>LWR</SUB>) of these nickel nanolines was found to be 2.9 nm. The technique is general and is likely to be suitable for fabrication of nanostructures of most commonly used metals (and their alloys), such as iron, cobalt, nickel, copper, tungsten, molybdenum, and so on, from their respective metal–organic compounds.</P> <B>Graphic Abstract</B> <P>Sub-10 nm nickel wires of good integrity are obtained by reducing electron-beam-patterned nickel naphthenate lines in a hydrogen-rich atmosphere at 500 °C for 1 h. The line-width roughness (i.e., 3 σ<SUB>LWR</SUB>) of these nickel nanolines is found to be 2.9 nm, which is below the limit of 3.2 nm discussed in the International Technology Roadmap for Semiconductors. <img src='wiley_img_2010/1616301X-2010-20-14-ADFM201000219-content.gif' alt='wiley_img_2010/1616301X-2010-20-14-ADFM201000219-content'> </P>
Nedelcu, Mihaela,Saifullah, Mohammad S. M.,Hasko, David G.,Jang, Arang,Anderson, David,Huck, Wilhelm T. S.,Jones, Geraint A. C.,Welland, Mark E.,Kang, Dae Joon,Steiner, Ullrich WILEY-VCH Verlag 2010 Advanced Functional Materials Vol.20 No.14
<B>Graphic Abstract</B> <P>This computer rendered graphic displays direct writing of sub-10 nm metallic wires of low line-width roughness using an electron beam (shown as a sinusoidal wave), as presented by M. S. M. Saifullah, D. J. Kang, U. Steiner, et al. on page 2317. Sub-10 nm metallic wires of good integrity and low line-width roughness were obtained by reducing electron-beam patterned metal naphthenate lines in a hydrogen-rich atmosphere at 500°C for 1 h. <img src='wiley_img_2010/1616301X-2010-20-14-ADFM201090059-content.gif' alt='wiley_img_2010/1616301X-2010-20-14-ADFM201090059-content'> </P>
Technology for Obtaining Samples of Layered Composite Materials with Metallic Matrix
Dumitru Nedelcu,Ioan Carcea 대한금속·재료학회 2013 METALS AND MATERIALS International Vol.19 No.1
Layered composite materials significantly improved the mechanical process of fracturing, which means better fracture strength, while preserving surface properties such as hardness, resistance to wear and resistance to high temperatures. The properties are significantly influenced by the interphase mass transfer at the surface matrix-fiber reinforcement. We developed a mathematical model to determine the molar flux at the interface in stationary and in a nonstationary regime. The technological parameters are: hydraulic pressure,reinforced material, alloy type, fiber diameter, mass ratio between the reinforcement and the composite masses and mould preheating temperature. A mould patented in Romania was mounted on a hydraulic press to obtain the samples. We studied the material structure, matrix and fiber element distribution, metallic matrix element distribution and matrix and fiber element content variation. The results recorded revealed a 75% to 120% increase of the fracture strength, which means an improvement of the mechanical process of fracturing. We concluded that the reinforcement material, mass ratio and fiber diameter have a significant influences on the fracture strength.
Development of Real-time Grinding Process Monitoring and Analysis System
Saurabh Kumar,Hong-Seok Park,Dumitru Nedelcu 한국정밀공학회 2021 International Journal of Precision Engineering and Vol.22 No.8
The success of the manufacturing process which involves grinding as one of the stages depends solely on the accuracy of the grinding process. Being the last stage of the manufacturing path, it is mostly done to provide the desired surface finish to the product. This makes the stage very crucial. To prevent the ruining of all the previous stages and eff orts, the real-time monitoring of the grinding stage becomes necessary which will make a room for better production planning and avoidance of failure occurrence. Conventionally the quality is dependent on the machine behavior as well as the operator’s skill. To make the process in par with the latest industry 4.0, real-time process monitoring of the grinding process with the use of a vibration sensor is considered. The developed system in the paper focusses on the monitoring of the process behavior and log the occurred changes. The hardware architecture and software modules are introduced in detail and the application of the developed system is demonstrated with the grinding of an automotive part. The developed system is convenient to use and very helpful in improving the overall productivity of the brake disc production facility by reducing the quality failures and hence saving the resources.