Center for Space Human Robotics, Istituto Italiano di Tecnologia, Turin 10129, Italy.
Nanoscale Res Lett. 2014 Jan 31;9(1):53. doi: 10.1186/1556-276X-9-53.
The electrical conductance response of single ZnO microwire functionalized with amine-groups was tested upon an acid pH variation of a solution environment after integration on a customized gold electrode array chip. ZnO microwires were easily synthesized by hydrothermal route and chemically functionalized with aminopropyl groups. Single wires were deposited from the solution and then oriented through dielectrophoresis across eight nanogap gold electrodes on a platform single chip. Therefore, eight functionalized ZnO microwire-gold junctions were formed at the same time, and being integrated on an ad hoc electronic platform, they were ready for testing without any further treatment. Experimental and simulation studies confirmed the high pH-responsive behavior of the amine-modified ZnO-gold junctions, obtaining in a simple and reproducible way a ready-to-use device for pH detection in the acidic range. We also compared this performance to bare ZnO wires on the same electronic platform, showing the superiority in pH response of the amine-functionalized material.
经胺基功能化的单根 ZnO 微米线的电导响应在集成到定制的金电极阵列芯片后，于溶液环境的酸 pH 值变化时进行了测试。通过水热法轻松合成了 ZnO 微米线，并通过氨丙基基团进行了化学功能化。从溶液中沉积单根微米线，然后通过电介质电泳在平台单芯片上的八个纳米间隙金电极上定向排列。因此，同时形成了八个功能化的 ZnO 微米线-金结，并且集成在特定的电子平台上，无需进一步处理即可进行测试。实验和模拟研究证实了胺修饰 ZnO-金结的高 pH 值响应行为，以简单且可重复的方式获得了用于酸性范围内 pH 值检测的即用型器件。我们还将这种性能与同一电子平台上的裸露 ZnO 线进行了比较，显示出胺功能化材料在 pH 响应方面的优越性。
