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Nanotechnology. 2013 May 3;24(17):175701. doi: 10.1088/0957-4484/24/17/175701. Epub 2013 Apr 3.

Centimeter-long Ta3N5 nanobelts: synthesis, electrical transport, and photoconductive properties.

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1
Key Laboratory of Mesoscopic Chemistry of MOE, and School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, People's Republic of China. wuxingca@nju.edu.cn

Abstract

Centimeter-long Ta3N5 nanobelts were synthesized by a reaction of centimeter-long TaS3 nanobelt templates with flowing NH3 at 800 °C for 2 h. The nanobelts have cross-sections of about 50 × 100 nm(2), and lengths up to 0.5 cm. A field effect transistor (FET) made of a single Ta3N5 nanobelt was fabricated on silica/silicon substrate. The electric transport of the individual nanobelt revealed that the nanobelt is a semiconductor with a room-temperature resistivity of 11.88 Ω m, and can be fitted well with an empirical formula ρ = 10831 exp(-T/43.8) - 22.6, where ρ is resistivity (Ω m) and T is absolute temperature (K). The FET showed decent photoconductive performance under light irradiation in the range 250-630 nm. The photocurrent increased by nearly 10 times the dark current under 450 nm light irradiation at an applied voltage of 5.0 V.

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