1. Betavoltaic effect in titanium dioxide nanotube arrays under build-in potential difference.
- Author
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Zhang, Qiang, Chen, Ranbin, San, Haisheng, Liu, Guohua, and Wang, Kaiying
- Subjects
- *
ELECTRIC batteries , *TITANIUM dioxide , *NANOTUBES , *CRYSTAL structure , *METAL foils , *OPEN-circuit voltage - Abstract
We report the fabrication of sandwich-type metal/TiO 2 nanotube (TNT) array/metal structures as well as their betavoltaic effects under build-in voltage through contact potential difference. The sandwiched structure is integrated by immobilized TNT arrays on Ti foil with radioisotope 63 Ni planar source on Ni substrate (Ni– 63 Ni/TNT array/Ti). Under irradiation of the 63 Ni source with activity of 8 mCi, the structure (TNT diameter ∼ 130 nm, length ∼ 11 μm) presents optimum energy conversion efficiency of 7.30% with open-circuit voltage of 1.54 V and short-circuit current of 12.43 nA. The TNT arrays exhibit a highly potential for developing betavoltaic batteries due to its wide band gap and nanotube array configuration. The TNT-betavoltaic concept offers a facile solution for micro/nano electronics with high efficiency and long life-time instead of conventional planar junction-type batteries. [ABSTRACT FROM AUTHOR]
- Published
- 2015
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