Nanocrystal Quantum Dots, Second Edition

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Reflecting recent advancements in colloidal nanocrystals and quantum-confined nanostructures, this second edition focuses on the semiconductor nanocrystals known as nanocrystal quantum dots. Gathering contributions from leading researchers, this edition includes new chapters on carrier multiplication (generation of multiexcitons by single photons), doping of semiconductor nanocrystals, and applications of nanocrystals in biology. The book also covers synthesis and assembly, spectroscopy of inter- and intraband optical transitions, single-nanocrystal optical and tunneling spectroscopy, transport properties, and nanocrystal applications in photovoltaics, light emitting technologies, lasing, bioimaging, and biosensing.

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Silicon Nanoelectronic Devices: Fabrication and Transport Properties

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It is estimated that the scaling of conventional silicon MOSFETs will end around the year 2020. While this certainly does not preclude the use of silicon in future devices, it does require new thoughts on the types of practical devices that can be used in integrated circuits. Namely, those that reduce power and work at least partly on the principles of quantum mechanics (such as spintronic or tunneling devices) will tend to be favored. The research presented herein is based on the fabrication and transport properties of nanometer-scale devices in silicon. The most promising of these structures are nanowires fabricated with a scanning tunneling microscope (STM). These high-density nanowires display the low-temperature phenomena of weak localization and one-dimensional conduction. Long-term applications of such nanowires and derivative devices include alternatives to conventional CMOS transistors and very sensitive charge and/or spin-detection devices. In addition, focused ion beams (FIBs) have been used to directly and precisely implant ions in the hope that they may be used to contact nanodevices, but surface damage may preclude that possibility.

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Electron Transport in Nanosystems

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The topics discussed at the NATO ARW included the new nanodevice applications, novel materials, mesoscopic superconductivity and biosensors. There have been many significant advances in the past two years and some entirely new directions of research are just opening up. Recent advances in nanoscience have demonstrated that fundamentally new physical phenomena are found when systems are reduced in size with dimensions, comparable to the fundamental microscopic length scales of the investigated material. Recent developments in nanotechnology and measurement techniques now allow experimental investigation of transport properties of nanodevices. Great interest in this research connected with development of spintronics, molecular electronics and quantum information processing.

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Poly and carbon nanotube mixed matrix membranes for gas separation

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This digital document is a journal article from Desalination, published by Elsevier in 2006. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.

Description:
Recent theoretical work by Sholl and coworkers has predicted that carbon nanotubes, if used as membranes, have the flux/selectivity properties that far exceed those of any other known inorganic or organic material. To verify this prediction, we have fabricated nano-composite membranes consisting of single-walled carbon nanotubes embedded in a poly(imide siloxane) copolymer and evaluated their transport properties. While the siloxane segment enhanced the interfacial contact, the polyimide component imparted mechanical integrity. A poly(imide siloxane) was synthesized using an aromatic dianhydride, an aromatic diamine and amine-terminated PDMS for the siloxane block. The weight percent of PDMS was determined to be 41 using ^1H-NMR. Permeability measurements of He showed drops in permeability with the addition on close-ended CNTs. This large drop in permeability of He suggests that the copolymer adhered well to the CNTs and that the prepared CNT MMMs were defect free. However, the permeability of O”2, N”2 and CH”4 increased in proportion to the amount of open-ended CNTs in the polymer matrix. This suggests that CNTs offer an attractive additive for universally enhancing the gas permeability of polymers.

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Quantum Wells, Wires and Dots: Theoretical and Computational Physics of Semiconductor Nanostructures

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Quantum Wells, Wires and Dots, 3rd Edition is aimed at providing all the essential information, both theoretical and computational, in order that the reader can, starting from essentially nothing, understand how the electronic, optical and transport properties of semiconductor heterostructures are calculated. Completely revised and updated, this text is designed to lead the reader through a series of simple theoretical and computational implementations, and slowly build from solid foundations, to a level where the reader can begin to initiate theoretical investigations or explanations of their own.

 

 

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