http://www.merlot.org:80/merlot/ A search of MERLOT materials Copyright 1997-2013 MERLOT. All rights reserved. Wed, 19 Jun 2013 22:27:53 PDT Wed, 19 Jun 2013 22:27:53 PDT http://www.merlot.org:80/merlot/images/merlot.gif http://www.merlot.org:80/merlot/ 44 34 http://www.merlot.org/merlot/viewMaterial.htm?id=490928 In this podcast, Professor Moriarty discusses nanotechnology, and how it has led to a convergence of the traditional sciences. He talks about the commercial applications of nanotechnology such as hard disk technology in laptops, stain free materials and fabrics, self-cleaning windows and advanced water filtration. He also touches on some of the myths about nanotechnology as well as some of the real dangers of Nanotechnology and the steps governments are taking to regulate it. Professor Moriarty is a researcher in the field of nanotechnology. http://www.merlot.org/merlot/viewMaterial.htm?id=413172 In the 21st century, scientists will not only use molecules as building blocks for creating vital new technologies, but possibly as the basis for dramatic new medical treatments and even creating synthetic life. Presented by The Kavli Foundation, Alan Alda narrates this six-minute video. http://www.merlot.org/merlot/viewMaterial.htm?id=85947 Recent demonstrations of high performance carbon nanotube field-effect transistors (CNFETs) highlight their potential for a future nanotube-based electronics. Besides being just a nanometer in diameter, carbon nanotubes offer intrinsic advantages if compared with silicon that are responsible for their outstanding properties. Their one-dimensional character is advantageous for a low scattering probability and consequently a high on-current in a transistor device. Electrons and holes behave similarly in CNs, enabling a complementary metal-oxide semiconductor (CMOS) like technology with n-type and p-type transistors. Since chemical bonds in case of carbon nanotubes are completely satisfied, problems with dangling bonds, as at any silicon surface, do not exist. This implies that carbon nanotubes can be more easily combined with various gate dielectrics, e.g. high-k dielectrics for an improved gate control. And last, the fact that metallic as well as semiconducting carbon nanotubes can be fabricated may lead to an all nanotube-based electronics with metallic tubes acting as interconnects and semiconducting tubes being used as active device regions.All of the above aspects of nanotubes have been experimentally verified. Investigating the physics of scaled CNFETs however revealed also a number of other - rather unexpected - properties of nanotube-based devices. The most important and far-reaching observation recently made is that CNFETs are indeed Schottky barrier devices. This has important implications for their scaling behavior as well as their performance limits. In my presentation I will focus in particular on this aspect of carbon nanotube transistors and discuss a number of our most recent experimental data and simulations. http://www.merlot.org/merlot/viewMaterial.htm?id=85955 No description given http://www.merlot.org/merlot/viewMaterial.htm?id=85960 No description given http://www.merlot.org/merlot/viewMaterial.htm?id=85961 No description given http://www.merlot.org/merlot/viewMaterial.htm?id=85962 No description given http://www.merlot.org/merlot/viewMaterial.htm?id=85966 No description given http://www.merlot.org/merlot/viewMaterial.htm?id=85967 This tutorial will provide an overview of scanning probe microscopy (SPM) and its application towards problems in molecular conduction. In an effort to communicate the power and limitations of these instruments, the tutorial will describe design considerations and reveal the detailed construction of a cryogenic variable temperature ultra-high vacuum scanning tunneling microscope. With the microscope complete, the tutorial will then discuss its use for a variety of techniques that have been used to study the properties and performance of molecular-scale electronic devices. Specific examples include Kelvin probe microscopy, conductive atomic force microscope potentiometry, scanning tunneling spectroscopy, and inelastic electron tunneling spectroscopy. http://www.merlot.org/merlot/viewMaterial.htm?id=85969 This tutorial will provide an overview of electronic structure calculations from a chemist's perspective. This will include a review of the basic electronic structure theories: Hartree-Fock and beyond, density functional theories and semiempirical theories; the atomic orbital basis sets used to represent the wavefunction; and properties that can be obtained from solutions to the Schrodinger equation. Much of the discussion will center on quantum chemistry methods that use Gaussian orbital basis functions to determine molecular orbitals, equilibrium geometries and the thermochemical properties of small molecules. We will also consider extensions relevant to molecular electronics.