Department of Biological Systems Engineering, University of Wisconsin-Madison, Madison, WI 53706, USA.
Anal Chim Acta. 2011 Dec 5;708(1-2):44-51. doi: 10.1016/j.aca.2011.09.039. Epub 2011 Oct 6.
A novel and facile approach has been developed to synthesize thin films of magnetite (Fe(3)O(4)) with epitaxial needle-like columnar grains on titanium nitride (TiN) buffered substrate using DC magnetron reactive sputtering. TiN buffer layer was first sputtered onto a substrate at 550 °C as a preferable substrate for growth following sputtering of epitaxial crystalline Fe(3)O(4) at 300 °C. The as-synthesized epitaxial Fe(3)O(4) was extensively characterized. The electrocatalytic activity of the epitaxial Fe(3)O(4) thin-film sensor against hydrogen peroxide (H(2)O(2)) reduction was rapid with a response time less than 5 s. The sensor also exhibited an acceptable stability, a satisfying sensitivity of 432.2 μA mM(-1) cm(-2), good specificity to the substrate, a dynamic working range of up to 0.7 mM and a low detection limit of 1.0 μM. The sensor performance correlated well (R(2)=0.996) with results obtained using a commercial HPLC-UV device. The sensor performance was robust and accurate in measuring H(2)O(2) in some complex matrices. The advantages of relative simplicity and ease of mass production make the epitaxial Fe(3)O(4) thin film promising candidate for use in sensing applications.
已经开发出一种新颖而简单的方法，通过直流磁控反应溅射在氮化钛（TiN）缓冲衬底上合成具有外延针状柱状晶粒的磁铁矿（Fe3O4）薄膜。TiN 缓冲层首先在 550°C 溅射在衬底上，作为在 300°C 溅射外延结晶 Fe3O4 之后生长的首选衬底。对合成的外延 Fe3O4 进行了广泛的表征。对外延 Fe3O4 薄膜传感器对过氧化氢（H2O2）还原的电催化活性具有快速响应时间，小于 5 s。该传感器还表现出可接受的稳定性、令人满意的灵敏度 432.2 μA mM(-1) cm(-2)、对基底的良好选择性、高达 0.7 mM 的动态工作范围和 1.0 μM 的低检测限。传感器性能与使用商业 HPLC-UV 设备获得的结果相关性良好（R2=0.996）。该传感器在一些复杂基质中测量 H2O2 的性能稳定且准确。相对简单和易于大规模生产的优点使外延 Fe3O4 薄膜成为传感应用的有前途的候选材料。
