PMID- 35549194
OWN - NLM
STAT- MEDLINE
DCOM- 20220517
LR  - 20220519
IS  - 2161-1653 (Electronic)
IS  - 2161-1653 (Linking)
VI  - 10
IP  - 7
DP  - 2021 Jul 20
TI  - Unraveling Depth-Specific Ionic Conduction and Stiffness Behavior across Ionomer 
      Thin Films and Bulk Membranes.
PG  - 791-798
LID - 10.1021/acsmacrolett.1c00110 [doi]
AB  - Interfacial behavior of submicron thick polymer films critically controls the 
      performance of electrochemical devices. We developed a robust, 
      everyday-accessible, fluorescence confocal laser scanning microscopy (CLSM)-based 
      strategy that can probe the distribution of mobility, ion conduction, and other 
      properties across ionomer samples. When fluorescent photoacid probe 
      8-hydroxypyrene-1,3,6-trisulfonic acid trisodium salt (HPTS) was incorporated 
      into <1 mum thick Nafion films on substrates, the depth-profile images showed 
      thickness- and interface-dependent proton conduction behavior. In these films, 
      proton conduction was weak over a region next to substrate interface, then 
      gradually increased until air interface at 88% RH. Conversely, consistently high 
      proton conduction with no interface dependence was observed across 35-50 mum thick 
      bulk, free-standing Nafion membranes. A hump-like mobility/stiffness distribution 
      was observed across Nafion films containing mobility-sensitive probe 
      (9-(2-carboxy-2-cyanovinyl)julolidine) (CCVJ). The proton conduction and mobility 
      distribution were rationalized as a combinatorial effect of interfacial 
      interaction, ionomer chain orientation, chain density, and ionic domain 
      characteristics.
FAU - Farzin, Seefat
AU  - Farzin S
AD  - Department of Chemical and Biomolecular Engineering, University of 
      Nebraska-Lincoln, Lincoln, Nebraska 68588, United States.
FAU - Zamani, Ehsan
AU  - Zamani E
AD  - Department of Chemical and Biomolecular Engineering, University of 
      Nebraska-Lincoln, Lincoln, Nebraska 68588, United States.
FAU - Dishari, Shudipto K
AU  - Dishari SK
AUID- ORCID: 0000-0003-1679-2332
AD  - Department of Chemical and Biomolecular Engineering, University of 
      Nebraska-Lincoln, Lincoln, Nebraska 68588, United States.
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
PT  - Research Support, U.S. Gov't, Non-P.H.S.
DEP - 20210610
PL  - United States
TA  - ACS Macro Lett
JT  - ACS macro letters
JID - 101574672
RN  - 0 (Ions)
RN  - 0 (Membranes, Artificial)
RN  - 0 (Polymers)
RN  - 0 (Protons)
SB  - IM
MH  - Ions/chemistry
MH  - *Membranes, Artificial
MH  - Polymers
MH  - *Protons
EDAT- 2022/05/14 06:00
MHDA- 2022/05/18 06:00
CRDT- 2022/05/13 11:41
PHST- 2022/05/13 11:41 [entrez]
PHST- 2022/05/14 06:00 [pubmed]
PHST- 2022/05/18 06:00 [medline]
AID - 10.1021/acsmacrolett.1c00110 [doi]
PST - ppublish
SO  - ACS Macro Lett. 2021 Jul 20;10(7):791-798. doi: 10.1021/acsmacrolett.1c00110. 
      Epub 2021 Jun 10.