Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 7, Issue 14, Pages 7709-7716Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b00647
Keywords
ion transport; biomimetics; nanofluid diode; bichannel device; PET film; Columnar nanochannel
Funding
- National Research Fund for Fundamental Key Projects [2011CB935704, 2012CB720904]
- National Natural Science Foundation [21271016, 91333120]
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A novel and simple design is introduced to construct bichannel nanofluid diodes by combining two poly(ethylene terephthalate) (PET) films with columnar nanochannel arrays varying in size or in surface charge. This type of bichannel device performs obvious ion current rectification, and the pH-dependent tunability and degree of rectification can be improved by histidine modification. The origin of the ion current rectification and its pH-dependent tunability are attributed to the cooperative effect of the two columnar half-channels and the applied bias on the mobile ions. As a result of surface groups on the bichannel being charged with different polarities or degrees at different pH values, the function of the bichannel device can be converted from a nanofluid diode to a normal nanochannel or to a reverse diode.
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