Template-Assisted Fabrication of Salt-Independent Catalytic Tubular Microengines

被引:181
作者
Manesh, Kalayil Manian [1 ]
Cardona, Maria [1 ]
Yuan, Rodger [1 ]
Clark, Michael [1 ]
Kagan, Daniel [1 ]
Balasubramanian, Shankar [1 ]
Wang, Joseph [1 ]
机构
[1] Univ Calif San Diego, Dept Nanoengn, La Jolla, CA 92093 USA
基金
美国国家科学基金会;
关键词
catalytic motor; microcone; propulsion; bubble recoil; salt; NANOMOTORS; NANOMACHINES; MOTORS; CARGO;
D O I
10.1021/nn1000468
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
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.
引用
收藏
页码:1799 / 1804
页数:6
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