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Ionic Diode Characteristics at a Polymer of Intrinsic Microporosity (PIM) | Nafion “Heterojunction” Deposit on a Microhole Poly(ethylene‐terephthalate) Substrate
Author(s) -
Putra Budi Riza,
Aaronson Barak D.B.,
Madrid Elena,
Mathwig Klaus,
Carta Mariolino,
MalpassEvans Richard,
McKeown Neil B.,
Marken Frank
Publication year - 2017
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.201700247
Subject(s) - ionomer , materials science , nafion , ionic bonding , chemical engineering , electrolyte , polymer , substrate (aquarium) , heterojunction , diode , aqueous solution , ethylene , polymer chemistry , optoelectronics , ion , composite material , copolymer , catalysis , chemistry , organic chemistry , electrochemistry , electrode , oceanography , engineering , geology
Ionic diode phenomena occur at asymmetric ionomer | aqueous electrolyte microhole interfaces. Depending on the applied potential, either an “open” or a “closed” diode state is observed switching between a high ion flow rate and a low ion flow rate. Physically, the “open” state is associated mainly with conductivity towards the microhole within the ionomer layer and the “closed” state is dominated by restricted diffusion‐migration access to the microhole interface opposite to the ionomer. In this report we explore a “heterojunction” based on an asymmetric polymer of intrinsic microporosity (PIM) | Nafion ionomer microhole interface. Improved diode characteristics and current rectification are observed in aqueous NaCl. The effects of creating the PIM | Nafion micro‐interface are investigated and suggested to lead to novel sensor architectures.