Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, Daejeon, Republic of Korea.
Nanotechnology. 2011 Jan 21;22(3):035601. doi: 10.1088/0957-4484/22/3/035601. Epub 2010 Dec 9.
A novel low-temperature, solution-phase method for the facile fabrication of a variety of one-dimensional (1D) metal/metal oxide hybrid nanostructures has been developed. This method is based on the wet chemical synthesis of metal oxide nanowires, followed by the surface coating of metal nanoparticles on metal oxide nanowire templates via reduction of metal ions along with controlled etching of metal oxide nanowires at the core, all in a low-temperature liquid environment. As a proof-of-concept, we applied this method to the fabrication of various 1D Pt/ZnO hybrid nanostructures including Pt nanoparticle-coated ZnO nanowires/nanotubes and Pt nanotubes on silicon and polymer substrates. The diverse morphology tuning is attributed to the control of pH in the solution with different metal precursor concentrations and amounts of reducing agent. The change of morphology, crystalline structure, and composition of various 1D Pt/ZnO hybrid nanostructures was observed by SEM, TEM (HRTEM), XRD and ICP-AES, respectively. Further, we have demonstrated a highly sensitive strain sensor (gauge factor = 15) with a Pt nanotube film fabricated by the developed method on a flexible polymer substrate.
一种新颖的低温溶液法，可方便地制备各种一维（1D）金属/金属氧化物杂化纳米结构。该方法基于金属氧化物纳米线的湿化学合成，然后通过还原金属离子并在核心处控制金属氧化物纳米线的蚀刻，在低温液态环境下在金属氧化物纳米线模板上进行金属纳米粒子的表面涂层。作为概念验证，我们将该方法应用于各种 1D Pt/ZnO 杂化纳米结构的制备，包括硅和聚合物衬底上的 Pt 纳米颗粒涂覆的 ZnO 纳米线/纳米管和 Pt 纳米管。通过改变溶液中的 pH 值以及金属前体浓度和还原剂的量来实现形貌的多样化调节。通过 SEM、TEM（HRTEM）、XRD 和 ICP-AES 分别观察了各种 1D Pt/ZnO 杂化纳米结构的形貌、晶体结构和组成的变化。此外，我们还展示了一种基于在柔性聚合物衬底上通过所开发的方法制备的 Pt 纳米管薄膜的高灵敏度应变传感器（应变系数=15）。
