期刊
JOURNAL OF MATERIALS CHEMISTRY C
卷 7, 期 2, 页码 223-229出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8tc05877f
关键词
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资金
- National Key Research and Development Program of China [2017YFA0204600]
- National Natural Science Foundation of China [51721002, 51872050, 11674061, 11811530065]
- Science and Technology Commission of Shanghai Municipality [18520744600, 18520710800, 17520742400]
Uniformly aligned electrospun nanofiber arrays are important building blocks for high-performance functional devices and device arrays. However, it remains a challenge to prepare perfectly aligned and large area nanofiber arrays using common electrospinning. In this work, a modified electrospinning method utilizing three assisted electrodes for nanofiber collection was proposed to achieve uniformly aligned and millimeter-long ZnO and NiO nanofiber arrays (more than 90% of nanofibers aligned to within +/- 4 degrees of the desired direction), which were further fabricated into ZnO/NiO heterojunction arrays with a density of 10(6) cm(-2). Photodetectors (PDs) based on the as-prepared ZnO/NiO heterojunction arrays exhibited excellent ultraviolet (UV) selective and self-powered detection properties because of the properly matched energy bands of ZnO and NiO. A maximum responsivity of 0.415 mA W-1 and a short rise/decay time of 7.5 s/4.8 s at 0 V bias of the device markedly outstripped the reference ZnO nanofiber array device. The three-assisted-electrode electrospinning method of this work offers new chances in novel nanostructure design and high-performance device fabrication.
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