Browsing by Author "Roth, Siegmar"

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Electron transport behavior of individual zinc oxide coated single-walled carbon nanotubes
(2009-03-11)
Lin, Chin-Ching
;
Chu, Bryan T. T.
;
Tobias, Gerard
;
Sahakalkan, Serhat
;
Roth, Siegmar
Uniform zinc oxide coated single-walled nanotubes (SWNTs) were fabricated by ultrasonic irradiation with acid-treated SWNTs, zinc acetate, and triethanolamine at low temperature in aqueous phase processing. The ZnO coating process did not decrease the dark current of the SWNTs, but a real decrease in the steady state negative photocurrent was observed after ZnO coating, suggesting a clear photosensitization effect. Transport measurements reveal that the negative photocurrent in s (semiconducting)-SWNTs@ZnO could be described by electron-hole compensation behavior attributed to the ZnO layer under ultraviolet excitation. This simple coating method for one-dimensional material can open up new possibilities for multifunctional nanodevices.