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Intrinsically Microporous Polymer Retains Porosity in Vacuum Thermolysis to Electroactive Heterocarbon

Rong, Yuanyang ; He, Daping ; Sanchez-fernandez, Adrian LU orcid ; Evans, Craig ; Edler, Karen J. LU orcid ; Malpass-evans, Richard ; Carta, Mariolino ; Mckeown, Neil B. ; Clarke, Tomos J. and Taylor, Stuart H. , et al. (2015) In Langmuir 31(44). p.12300-12306
Abstract
Vacuum carbonization of organic precursors usually causes considerable structural damage and collapse of morphological features. However, for a polymer with intrinsic microporosity (PIM-EA-TB with a Brunauer–Emmet–Teller (BET) surface area of 1027 m2g–1), it is shown here that the rigidity of the molecular backbone is retained even during 500 °C vacuum carbonization, yielding a novel type of microporous heterocarbon (either as powder or as thin film membrane) with properties between those of a conducting polymer and those of a carbon. After carbonization, the scanning electron microscopy (SEM) morphology and the small-angle X-ray scattering (SAXS) Guinier radius remain largely unchanged as does the cumulative pore volume. However, the BET... (More)
Vacuum carbonization of organic precursors usually causes considerable structural damage and collapse of morphological features. However, for a polymer with intrinsic microporosity (PIM-EA-TB with a Brunauer–Emmet–Teller (BET) surface area of 1027 m2g–1), it is shown here that the rigidity of the molecular backbone is retained even during 500 °C vacuum carbonization, yielding a novel type of microporous heterocarbon (either as powder or as thin film membrane) with properties between those of a conducting polymer and those of a carbon. After carbonization, the scanning electron microscopy (SEM) morphology and the small-angle X-ray scattering (SAXS) Guinier radius remain largely unchanged as does the cumulative pore volume. However, the BET surface area is decreased to 242 m2g–1, but microporosity is considerably increased. The new material is shown to exhibit noticeable electrochemical features including two pH-dependent capacitance domains switching from ca. 33 Fg–1 (when oxidized) to ca. 147 Fg–1 (when reduced), a low electron transfer reactivity toward oxygen and hydrogen peroxide, and a four-point-probe resistivity (dry) of approximately 40 MΩ/square for a 1–2 μm thick film. (Less)
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publishing date
type
Contribution to journal
publication status
published
in
Langmuir
volume
31
issue
44
pages
12300 - 12306
publisher
The American Chemical Society (ACS)
external identifiers
  • scopus:84946924961
ISSN
0743-7463
DOI
10.1021/acs.langmuir.5b02654
language
English
LU publication?
no
id
2f3d8f8e-aacb-438d-a640-826d0e86866b
date added to LUP
2019-01-21 10:08:53
date last changed
2022-07-13 08:33:10
@article{2f3d8f8e-aacb-438d-a640-826d0e86866b,
  abstract     = {{Vacuum carbonization of organic precursors usually causes considerable structural damage and collapse of morphological features. However, for a polymer with intrinsic microporosity (PIM-EA-TB with a Brunauer–Emmet–Teller (BET) surface area of 1027 m2g–1), it is shown here that the rigidity of the molecular backbone is retained even during 500 °C vacuum carbonization, yielding a novel type of microporous heterocarbon (either as powder or as thin film membrane) with properties between those of a conducting polymer and those of a carbon. After carbonization, the scanning electron microscopy (SEM) morphology and the small-angle X-ray scattering (SAXS) Guinier radius remain largely unchanged as does the cumulative pore volume. However, the BET surface area is decreased to 242 m2g–1, but microporosity is considerably increased. The new material is shown to exhibit noticeable electrochemical features including two pH-dependent capacitance domains switching from ca. 33 Fg–1 (when oxidized) to ca. 147 Fg–1 (when reduced), a low electron transfer reactivity toward oxygen and hydrogen peroxide, and a four-point-probe resistivity (dry) of approximately 40 MΩ/square for a 1–2 μm thick film.}},
  author       = {{Rong, Yuanyang and He, Daping and Sanchez-fernandez, Adrian and Evans, Craig and Edler, Karen J. and Malpass-evans, Richard and Carta, Mariolino and Mckeown, Neil B. and Clarke, Tomos J. and Taylor, Stuart H. and Wain, Andrew J. and Mitchels, John M. and Marken, Frank}},
  issn         = {{0743-7463}},
  language     = {{eng}},
  month        = {{11}},
  number       = {{44}},
  pages        = {{12300--12306}},
  publisher    = {{The American Chemical Society (ACS)}},
  series       = {{Langmuir}},
  title        = {{Intrinsically Microporous Polymer Retains Porosity in Vacuum Thermolysis to Electroactive Heterocarbon}},
  url          = {{http://dx.doi.org/10.1021/acs.langmuir.5b02654}},
  doi          = {{10.1021/acs.langmuir.5b02654}},
  volume       = {{31}},
  year         = {{2015}},
}