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(Color online) (a) The tilt-viewed and (b) the cross-sectional viewed FESEM images and (c) the XRD pattern of the well aligned rutile TiO2 NRs grown by MOCVD. (d) The TEM image and its SAD pattern focusing on the individual TiO2 NR.
(Color online) (a) The selected i d–V curves measured in the temperature range of 77–320 K for the single TiO2 NR with 300 nm in diameter. The inset shows the representative micrograph of a FIB-fabricated TiO2 NR device. (b) The calculated conductivity versus temperature and its corresponding Arrhenius plot (the inset) of the single TiO2 NR with 300 nm in diameter.
(Color online) The light intensity dependences of (a) photocurrent and (b) normalized gain for the monocrystalline TiO2 NR (blue open circle) and the polycrystalline NTs (green open square). The data points of the TiO2 NT are taken from Ref. 10. The inset in Fig. 3(a) illustrates a typical photocurrent response curve at the bias of 0.1 V and I = 40 Wm−2.
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