Department of Physics, Jiangsu Key Laboratory of Thin Films, Soochow University, Suzhou 215006, PR China.
ACS Appl Mater Interfaces. 2013 Aug 28;5(16):7845-51. doi: 10.1021/am401762y. Epub 2013 Aug 8.
Flexible three-dimensional SnO2 nanowire arrays were synthesized on a carbon cloth template in combination with atomic layer deposition and vapor transport. The as-grown nanostructures were assembled by high density quasi-aligned nanowires with a large aspect ratio. Nanoscale photodetectors based on the flexible nanostructure demonstrate excellent ultraviolet light selectivity, a high speed response time less than 0.3 s, and dark current as low as 2.3 pA. Besides, field emission measurements of the hierarchical structure show a rather low turn-on field (3.3 Vμm(-1)) and threshold field (4.5 Vμm(-1)), as well as an excellent field enhancment factor (2375) with a long-term stability up to 20 h. These results indicate that the flexible three-dimensional SnO2 nanowire arrays can be used as functional building blocks for efficient photodetectors and field emitters.
柔性三维 SnO2 纳米线阵列在碳布模板上通过原子层沉积和气相输运相结合的方法合成。所生长的纳米结构由高密度准排列的纳米线组装而成，具有大纵横比。基于柔性纳米结构的纳米级光电探测器表现出优异的紫外光选择性、高速响应时间（小于 0.3 s）和低暗电流（低至 2.3 pA）。此外，对分级结构的场发射测量表明，开启场（3.3 Vμm(-1)）和阈值场（4.5 Vμm(-1)）相当低，场增强因子（2375）非常高，且具有长达 20 h 的长期稳定性。这些结果表明，柔性三维 SnO2 纳米线阵列可用作高效光电探测器和场发射器的功能构建块。
