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individual Y-junctions were chemically removed from their growth template [158] and deposited on patterned electrodes. Electrical field enhanced diffusion of gold was applied to yield an ohmic contact between nanotube and electrodes. I-V data display distinct asymmetric and rectifying behavior with current flowing more easily under negative bias. Li et al. modeled the Y-junction nanotube as a p-p isotype semiconductor heterojunction with different bandgaps using standard heterostructure semiconductor physics and explained the observed results. Rectifying behavior was also observed by Chiu et al. [163] using chemical functionalized nanotube junctions, by Kim et al. [176] using V2O5 nanofiber-carbon nanotube junction, and by Zhou et al. [164] using carbon nanotube p-n junctions.

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