tailieunhanh - NANOWIRES - RECENT ADVANCES_2

One dimensional nanoscale structures such as nanowires have drawn extensive research interests in recent years. The size miniature brings unique properties to nanowires due to quantum confinement. The large surface-to-volume ratio renders nanowires with high sensitivity to surface effects. The unique geometrical advantages and properties facilitate the utilization of nanowires in nano-electronics. InTech scientific publisher has initialized a series of books focusing on fundamental research in nanowires, which largely boosted the widespread of knowledge among the research society | Chapter 11 Thermal Transport in Semiconductor Nanowires J. Anaya J. Jimenez and T. Rodríguez Additional information is available at the end of the chapter http 10. 5772 52588 1. Introduction Since the late 1990 s semiconductor NWs research is in expansion because of the huge number of potential applications of these one dimensional structures. This research effort is given expression as a vast number of research articles. Semiconductor NWs are the building blocks of advanced nanodevices e. g. field effect transistors interconnects heterostructured devices as vertically oriented nanoscale laser diodes and HBTs thermoelectric converters photovoltaic devices and sensors 1-5 . The thermal transport in NWs is receiving a great deal of attention because it constitutes a critical issue for the performance and reliability of NWs based devices. Because of the size reduction a large power density needs to be dissipated especially in devices operating at high current and power densities which induces a non negligible Joule heating therefore the control of the thermal conductivity is crucial to the thermal extraction from the active parts of these devices 6 . On the other hand bulk semiconductors are usually good thermal and electrical conductors which limits their potential performance in thermoelectric devices however it was demonstrated that surface engineered semiconductor NWs behave essentially as thermal insulators 2 being at the same time good electrical conductors this means that semiconductor NWs can have a large themoelectric figure of merit 2 7-9 which can make them very good thermoelectric materials for waste heat recovery and power generation over a large temperature range. The experimental measurement of the thermal conductivity at the nanoscale is very challenging 11-13 with very few available contrasted measurements. In this context of lack of experimental results the development of confident models for describing the thermal conductivity of .

• Hoá dầu
• Spintronic Applications
• Gas Sensing
• Anodized Aluminum
• Oxide Nanochannels
• Photoelectrochemical
• Water Splitting
• TiO2 nanofibers
• Sandwich structured
• Enhanced photoelectrochemical water splitting efficiency
• CdS/Au/TiO2 sandwich nanofibers
• Visible light
• Transition metal
• Photocatalytic system for enhancing H2 generation
• Enhancing H2 generation from water splitting
• Journal of Chemistry
• Blue TiO2 nanotubes
• Cathodic polarization
• Self doping
• Photoelectrochemical properties
• Finite Volume Method
• Flux difference Splitting Method
• A two dimensional
• Shallow Water Equations
• Dam break case study
• Black TiO2
• Spectroscopic technique
• UV visible reflectance
• Raman spectroscopy
• CdS photocatalyst
• Supported photocatalyst
• X ray spectroscopy
• Diffuse reflectance spectroscopy