Template-Assisted Fabrication of Salt-Independent Catalytic Tubular Microengines
Template-Assisted Fabrication of Salt-Independent Catalytic Tubular Microengines
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DOI：
10.1021/nn1000468
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发表时间：
2010-04-01
期刊：
影响因子：
17.1
通讯作者：
Wang, Joseph
中科院分区：
文献类型：
--
作者：
Manesh, Kalayil Manian;Cardona, Maria;Wang, Joseph
介绍了一种简化的模板辅助分层方法，用于制备催化锥形管微喷射发动机，该方法基于在蚀刻的Aver线模板上顺序沉积铂和金，然后切割和溶解模板。该方法允许详细的控制管参数，因此对性能的微型发动机。反冲气泡推进机制的管状微引擎，与喷射内部产生的氧气微泡，解决了催化纳米线电机的离子强度限制，并导致盐独立的运动。在无盐和富盐介质中观察到类似的气泡产生速率和马达速度（在高达1M NaCl的升高的离子强度环境下）。中间镍层的电镀促进了磁性引导运动以及大型（磁性）“货物”的拾取和运输。表面活性剂的加入显示出降低表面张力，并提供更频繁地形成致密的小气泡。新的和改进的电机能力沿着简单的制备路线，为在各种重要的应用中使用催化微电机提供了巨大的希望。
A simplified template-assisted layering approach for preparing catalytic conical tube microjet engines based on sequential deposition of platinum and gold on an etched Aver wire template followed by dicing and dissolution of the template is described. The method allows detailed control over the tube parameters and hence upon the performance of the microengine. The recoiling bubble propulsion mechanism of the tubular microengine, associated with the ejection of internally generated oxygen microbubbles, addresses the ionic-strength limitation of catalytic nanowire motors and leads to a salt-independent movement. Similar rates of bubble generation and motor speeds are observed in salt-free and salt-rich media (at elevated ionic-strength environments as high as 1 M NaCl). Plating of an intermediate nickel layer facilitates a magnetically guided motion as well as the pickup and transport of large (magnetic) "cargo". Surfactant addition is shown to decrease the surface tension and offer a more frequent formation of dense smaller bubbles. The new and improved motor capabilities along with the simple preparation route hold great promise for using catalytic micromotors in diverse and important applications.