TAILIEUCHUNG - Nanowires - P2

Free-standing semiconductor nanowires have been used to fabricate nanometer-scale field-effect transistors (FETs), bipolar junction transistors, and light- emitting diodes, nano-scale lasers, complementary inverters, complex logic gates, gas sensors, nano-resonators, nano-generators and nano-photovoltaic devices. Since the very first pioneering works carried out by K. Hiruma in Japan in the mid 90’s, and by . | 10 Advanced Electron Microscopy Techniques on Semiconductor Nanowires from Atomic Density of States Analysis to 3D Reconstruction Models Sònia Conesa-Boj1 Sònia Estradé1 Josep M. Rebled1 Joan D. Prades1 A. Cirera1 Joan R. Morante1 2 Francesca Peiró1 and Jordi Arbiol1 3 1Dept. d Electronica Universitat de Barcelona 2IREC Catalonia Institute for Energy Research 3ICREA Research Professor at Institut de Ciència de Materials de Barcelona CSIC Spain 1. Introduction Technology at the nanoscale has become one of the main scientific world challenges as new quantum physical effects appear and can be modulated at will Kastner 1992 . Superconductors materials for spintronics electronics optoelectronics chemical sensing and new generations of functionalized materials are taking advantage of the low dimensionality improving their properties and opening a new range of applications De Franceschi et al. 2003 Samuelson et al. 2004 Fischer et al. 2006 Pettersson et al. 2006 Wang et al. 2006 Hernández-Ramírez et al. 2007 Qin et al. 2007 Appenzeller et al. 2008 Boukai et al. 2008 Hochbaum et al. 2008 Wang et al. 2008 Colombo et al. 2009 Thunick et al. 2009 . These new materials for future applications are being synthesized at the nanoscale ultrathin layers nanoparticles nanowires or nanotubes functionalized . Among all these new materials one-dimensional 1D nanostructures such as nanowires are one of the most used and promising morphologies Lieber 2003 Yang 2005 Thelander et al. 2006 Lieber Wang 2007 . Groups all around the world in the area of materials science physics chemistry and biology work in close collaboration with nanoscopy tools as there is a critical need for the structural chemical and morphological characterization of the synthesized nanostructures at atomic scale in order to correlate these results with the physical and chemical properties and functionalities they present. In order to obtain an accurate control and understanding of these new materials properties it is .

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