Ma Zong-Min, Wu Xing-Sheng, Zheng Dou-Dou, Wei Jiu-Yan, Xie Yan-Na, Shi Yun-Bo, Huang Kun, Zhang Xiao-Ming, Liu Jun
Science and Technology on Electronic Test & Measurement Laboratory, North University of China, No.3, Xue Yuan Road, Taiyuan, 030051, Shanxi, China.
School of Instrument and Electronics, North University of China, Taiyuan, 030051, China.
Nanoscale Res Lett. 2019 Feb 6;14(1):49. doi: 10.1186/s11671-019-2883-4.
Nowadays, determination of the iron ions with high sensitivity and selectivity with novel methods becomes a matter of urgency for monitoring healthy body and environment. In this paper, for the first time, we present a set of high-performance TiO nanotube arrays which are quite sensitive to iron ions. Firstly, the anodic oxidation method was adopted to prepare ordered TiO nanotube arrays, followed by functionalized Ag nanoparticle deposition with the enhancement ability in iron ion sensing. Besides, the spectrum of the TiO nanotube with/without the Ag nanoparticles was analyzed with an X-ray photoelectron spectrometer, which shows that Ag nanoparticles can effectively reduce the recombination rate of electrons and holes, and increase the conductivity and the charge transfer rate of the electrodes. Further, when functionalized Ag nanoparticles on well-ordered TiO nanotube arrays were used, iron ion sensing performed with the anodic stripping voltammetry method was investigated to validate the great potential of TiO nanotube arrays with a sensitivity of approximately 30 μA/ug/L in becoming Fe sensors. This method creates new possibilities for developing sensors for monitoring of Fe in biological samples without any sample pretreatment procedure.
如今，采用新方法高灵敏度和高选择性地测定铁离子已成为监测身体健康和环境的当务之急。在本文中，我们首次展示了一组对铁离子非常敏感的高性能TiO纳米管阵列。首先，采用阳极氧化法制备有序的TiO纳米管阵列，随后沉积具有增强铁离子传感能力的功能化银纳米颗粒。此外，用X射线光电子能谱仪分析了有无银纳米颗粒的TiO纳米管的光谱，结果表明银纳米颗粒能有效降低电子与空穴的复合率，提高电极的导电性和电荷转移速率。进一步地，当使用有序TiO纳米管阵列上的功能化银纳米颗粒时，研究了采用阳极溶出伏安法进行的铁离子传感，以验证TiO纳米管阵列在成为铁传感器方面的巨大潜力，其灵敏度约为30 μA/μg/L。该方法为开发无需任何样品预处理程序即可监测生物样品中铁的传感器创造了新的可能性。
