Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 5, Issue 16, Pages 7931-7936Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am402004k
Keywords
nanofluidic diode; branched alumina nanochannel; tunable ionic rectification; pH; concentration; cooperative asymmetry
Funding
- National Natural Science Foundation of China [21101009, 20971010]
- National Basic Research Program of China (973 Program) [2010CB934700]
- Research Fund for the Doctoral Program of Higher Education of China [20101102120051]
- Fundamental Research Funds for the Central Universities [YWF-10-03-Q-088]
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In this work, the synthetic alumina nanochannels with bi-, tri-, and tetra-branched geometry structures exhibited ionic current rectifications with nonlinear I-V curves. Such diode performance of the branched alumina nanochannel is mainly dependent on the cooperative asymmetry of the branched structure and the surface-charge distribution on inner walls. By regulating the geometry, electrolyte pH, and solution concentration, the tunable ionic rectification properties are effectively obtained including both the rectification ratios and the rectifying direction that were deduced from the converted ion selectivity. This nanofluidic diode may open up a new opportunity for the application of the complex nanofluidic devices in contrast to previously reported channels to provide molecular analysis, controlled mass transport, drug release, and various logic gate operations.
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