Hyunjung Lee

TL;DR: In this paper, the authors report thermal and magnetic responses of a magnetized YBCO disk cooled by a cryogenic design/operation concept that incorporates solid nitrogen in the system, and describe a 0.5-T/80 cm bore magnet wound with MgB/sub 2/ presently being developed at FBML.

Abstract: Moore’s law in silicon technology has mainly been upheld by shrinking transistor dimensions or packing more transistors on the two-dimensional plane of integrated circuit chip. One approach to this transistor scaling is to exploit the vertical third dimension by producing layers of devices on a chip or by stacking transistors. This three-dimensional integration for silicon chips has already been demonstrated. Recently, an approach based on transfer printing has been presented for fabricating heterogeneous three dimensional electronics. In contrast to these inorganic and carbon nanotube devices, the three-dimensional integration is relatively easier to accomplish for organic devices because the fabrication typically involves stacking of organic layers. There are, however, certain aspects unique to organic devices that need to be dealt with to realize the vertical integration. These aspects are related to the issues pertaining to the formation of an organic isolation layer between two devices, one above and the other below the layer, for the stacked device configuration. In this communication, we present approaches that can be used for vertical stacking of organic thin film transistors (OTFTs). The approaches presented here could pave the way to producing vertically integrated three dimensional organic memory and processor chips. The OTFT structure used in this work is of bottom gate and top contact. After cleaning a glass substrate, the aluminum gate was defined on the substrate by thermal evaporation. A gate dielectric of optical grade poly(methylmethacrylate) (PMMA) was then spin coated onto the substrate. Pentacene was then deposited by thermal evaporation, followed by thermal gold deposition through a shadow mask to define the source and drain electrodes. All electrical measurements were carried out in a glove box. Because of the damage a solvent can cause, a layer is needed to protect the underlying layer of pentacene when a polymer solution is coated on the base device. We chose fluoroethylenepropylene (FEP) as a material for the protection layer because of its very low surface energy. The vapor-deposited

TL;DR: It is reported that nitro compounds were detected by the bacterial sensor based on hydrogel microbeads as a platform, which enables easier detection of explosives efficiently by a remote detection, even over a long distance.