Hang Ruiqiang, Liu Yanlian, Zhao Lingzhou, Gao Ang, Bai Long, Huang Xiaobo, Zhang Xiangyu, Tang Bin, Chu Paul K
Research Institute of Surface Engineering, Taiyuan University of Technology No. 79 Yingze West Road, Taiyuan 030024, China.
State Key Laboratory of Military Stomatology, Department of Periodontology, School of Stomatology, The Fourth Military Medical University No. 145 West Changle Road, Xi'an 710032, China.
Sci Rep. 2014 Dec 18;4:7547. doi: 10.1038/srep07547.
Nickel-titanium-oxide (Ni-Ti-O) nanotube arrays (NTAs) prepared on nearly equiatomic NiTi alloy shall have broad application potential such as for energy storage and biomedicine, but their precise structure control is a great challenge because of the high content of alloying element of Ni, a non-valve metal that cannot form a compact electronic insulating passive layer when anodized. In the present work, we systemically investigated the influence of various anodization parameters on the formation and structure of Ni-Ti-O NTAs and their potential applications. Our results show that well controlled NTAs can be fabricated during relatively wide ranges of the anodization voltage (5-90 V), electrolyte temperature (10-50°C) and electrolyte NH4F content (0.025-0.8 wt%) but within a narrow window of the electrolyte H2O content (0.0-1.0 vol%). Through modulating these parameters, the Ni-Ti-O NTAs with different diameter (15-70 nm) and length (45-1320 nm) can be produced in a controlled manner. Regarding potential applications, the Ni-Ti-O NTAs may be used as electrodes for electrochemical energy storage and non-enzymic glucose detection, and may constitute nanoscaled biofunctional coating to improve the biological performance of NiTi based biomedical implants.
在近等原子比的镍钛合金上制备的镍钛氧化物（Ni-Ti-O）纳米管阵列（NTAs）在能量存储和生物医学等领域具有广泛的应用潜力，但其精确的结构控制是一项巨大的挑战，因为合金元素镍含量高，镍是一种非阀金属，在阳极氧化时不能形成致密的电子绝缘钝化层。在本工作中，我们系统地研究了各种阳极氧化参数对Ni-Ti-O NTAs的形成、结构及其潜在应用的影响。我们的结果表明，在相对较宽的阳极氧化电压范围（5 - 90 V）、电解液温度范围（10 - 50°C）和电解液NH4F含量范围（0.025 - 0.8 wt%）内，但在电解液H2O含量的狭窄窗口（0.0 - 1.0 vol%）内，可以制备出控制良好的NTAs。通过调节这些参数，可以可控地制备出不同直径（15 - 70 nm）和长度（45 - 1320 nm）的Ni-Ti-O NTAs。关于潜在应用，Ni-Ti-O NTAs可用作电化学能量存储和非酶葡萄糖检测的电极，并可构成纳米级生物功能涂层以改善基于NiTi的生物医学植入物的生物学性能。
