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Tunable electron and phonon properties of folded single-layer molybdenum disulfide

Nano Research 2018年第3期11卷 1541-1553页

作者： Jie Peng Peter W. Chung Madan Dubey Raju R. Namburu Department of Mechanical Engineering University of Maryland College Park MD 20742 USA Sensors & Electron Devices Directorate U.S. Army Research Laboratory Adelphi MD 20783 USA Computational & Information Sciences Directorate U.S. Army Research Laboratory Aberdeen Proving Ground MD 21005 USA

A unique feature of transition metal dichalcogenides is their single-layer form, which enables folding. Although folding has been found to significantly affect the photoluminescence spectrum and some in-plane properties, only limited insight has been gained on how to modulate those properties. In this report, we examine the structure of folds of a single sheet of MoS2 and the dependence of the ground-s tate electronic and phonon transport properties on the wrapping length. As the folded structure is effectively a bilayer that terminates in a loop, the wrapping length modulates the relative size of the bilayer region to the closed loop along the edge. A combination of computational methods, including approaches based on variational mechanics, classical potentials, and density functional theory, are employed. Highly accurate calculations of the reference folded structure are first carried out to show that the folded structure is largely insensitive to the wrapping length. The folded structures are subsequently used to estimate the electronic band gap, which is found to vary significantly as a function of the wrapping length, and converges from below to the limit value corresponding to an infinite bilayer. The gap values range from 0.43 to 1.09 eV, with a crossover to an indirect gap, which suggests that the transitions must be lattice-assisted, similar to the transitions in the bilayer and bulk forms. However, the phonons, while affected by the formation of the folded structure, are insensitive to the wrapping length. In fact, the overall thermal transport behavior along the folding axis is unchanged. The possibility of modulating the gap value while keeping the thermal properties unchanged opens up new exciting avenues for further applications of this emerging material.

关键词： molybdenum disulfide folded structure electronic band structure thermal conductivity phonon

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Design of a novel mixer with high gain and linearity improvement for DRM/DAB applications

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Journal of Semiconductors 2013年第1期34卷 89-93页

作者：吴毅强王志功徐建王剑张欧力唐路 Institution of RF- & OE-ICs Southeast University

This paper focuses on a new design of a down-conversion mixer for a low-IF wideband *** on the folded structure and differential multiple gated transistor（DMGTR） technique,a novel quadrature mixer with a high conversion gain,a moderate linearity,and a moderate NF is *** mixer is designed and implemented in a 0.18-m CMOS process,and can operate in a frequency range from 150 kHz to 1.5 *** circuit performance is confirmed by both simulation and measurement *** measurement results exhibit a peak conversion gain of 13.35 dB,a high third order input referred intercept point of 14.85 dBm,and a moderate single side band noise figure of 10.67 ***,the whole quadrature mixer core occupies a compact die area of 0.122 *** consumes a current of 3.96 mA（excluding the output buffers） under a single supply voltage of 1.8 V.

关键词： down-conversion mixer folded structure DMGTR high gain low NF

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ON TECHNOLOGICAL PR OBLEMS OF FABRICATION OF RELIEF DESIGNS BY ISOMETRIC TRANSFORMATION OF THIN SHEET

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Transactions of Nanjing University of Aeronautics and Astronautics 2001年第1期18卷 11-16页

作者：哈里乌林BИ 特瓦伊哥拉作夫И 俄罗斯国立喀山技术大学飞行器系

Some problems connect ed with production of new light-weight filler type are considered for sandwich layers. Constructively, the filler is the folded structure that can be developed on a plane. This feature makes it possible to produce the filler by isometric t ransformation of thin sheet through local bending without material *** e main difficulty is that the bending must be carried out along all lines of com plex-shaped marking-out at a time. The problem of shaping can be solved by use of the original shaping device that can be transformed in operation. The herein -presented technology of production makes it possible to fabricate parts with d eep relief using a wide gamut of different materials even as the thin-sheet met al alloys and paper.

关键词： light-weight filler r egular relief folded structure isometric transformation transformable shaping device

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