Energy Transport and Conversion in Electron Emission Processes

Energy Transport and Conversion in Electron Emission Processes

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Single-walled and multi-walled CNT arrays have been intercalated with potassium to reduce their work functions to 2-3 eV, and the energy distributions of emitted electrons are measured with a hemispherical energy analyzer. Results show that emitters prepared in this way are highly sensitive to light in the dominant solar wavelengths. The effective work function of both single-walled and multi-walled carbon nanotubes intercalated with potassium (K/SWCNT and K/MWCNT, respectively) is temperature-dependent and has a minimum of approximately 2 eV in the neighborhood of 300AdC for K/SWCNTs while the minimum for K/MWCNTs is approximately 2.4 eV in the neighborhood of 500AdC. Results from control samples without CNTs are also presented and display substantially inferior emission.82 5.6: Total thermistor heating as a function of emission current for the MWNT array featured in Fig. 8. The inset enlarges data ... 103 6.4: Schematic diagram of the electrical circuit for measuring current-voltage field emission characteristics.

Title:Energy Transport and Conversion in Electron Emission Processes
Publisher:ProQuest - 2008

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