Tuning percolation speed in layer-by-layer assembled polyaniline- nanocellulose composite films
(2011) In Journal of Solid State Electrochemistry 15(11-12). p.2675-2681- Abstract
Polyaniline of low molecular weight (ca. 10 kDa) is combined with cellulose nanofibrils (sisal, 4-5 nm average cross-sectional edge length, with surface sulphate ester groups) in an electrostatic layer-by-layer deposition process to form thin nano-composite films on tin-doped indium oxide (ITO) substrates. AFM analysis suggests a growth in thickness of ca. 4 nm per layer. Stable and strongly adhering films are formed with thicknessdependent coloration. Electrochemical measurements in aqueous H 2SO 4 confirm the presence of two prominent redox waves consistent with polaron and bipolaron formation processes in the polyaniline-nanocellulose composite. Measurements with a polyaniline-nanocellulose film applied across... (More)
Polyaniline of low molecular weight (ca. 10 kDa) is combined with cellulose nanofibrils (sisal, 4-5 nm average cross-sectional edge length, with surface sulphate ester groups) in an electrostatic layer-by-layer deposition process to form thin nano-composite films on tin-doped indium oxide (ITO) substrates. AFM analysis suggests a growth in thickness of ca. 4 nm per layer. Stable and strongly adhering films are formed with thicknessdependent coloration. Electrochemical measurements in aqueous H 2SO 4 confirm the presence of two prominent redox waves consistent with polaron and bipolaron formation processes in the polyaniline-nanocellulose composite. Measurements with a polyaniline-nanocellulose film applied across an ITO junction (a 700 nm gap produced by ion beam milling) suggest a jump in electrical conductivity at ca. 0.2 V vs. SCE and a propagation rate (or percolation speed) two orders of magnitude slower compared to that observed in pure polyaniline This effect allows tuning of the propagation rate based on the nanostructure architecture. Film thickness-dependent electrocatalysis is observed for the oxidation of hydroquinone.
(Less)
- author
- Shariki, Sara ; Liew, Soon Yee ; Thielemans, Wim ; Walsh, Darren A. ; Cummings, Charles Y. ; Rassaei, Liza ; Wasbrough, Matthew J. ; Edler, Karen J. LU ; Bonné, Michael J. and Marken, Frank
- publishing date
- 2011-12
- type
- Contribution to journal
- publication status
- published
- keywords
- Cellulose, Electrocatalysis, Electrochromism, Junction, Layer-by-layer assembly, Nanocrystal, Nanofibril, PANI, Percolation, Phase propagation rate .Voltammetry, Polyaniline
- in
- Journal of Solid State Electrochemistry
- volume
- 15
- issue
- 11-12
- pages
- 7 pages
- publisher
- Springer
- external identifiers
-
- scopus:84855549556
- ISSN
- 1432-8488
- DOI
- 10.1007/s10008-010-1261-z
- language
- English
- LU publication?
- no
- id
- 9f9c6d93-6163-4691-89ae-0b59e0141d2f
- date added to LUP
- 2023-05-04 18:16:35
- date last changed
- 2023-06-08 13:00:13
@article{9f9c6d93-6163-4691-89ae-0b59e0141d2f, abstract = {{<p>Polyaniline of low molecular weight (ca. 10 kDa) is combined with cellulose nanofibrils (sisal, 4-5 nm average cross-sectional edge length, with surface sulphate ester groups) in an electrostatic layer-by-layer deposition process to form thin nano-composite films on tin-doped indium oxide (ITO) substrates. AFM analysis suggests a growth in thickness of ca. 4 nm per layer. Stable and strongly adhering films are formed with thicknessdependent coloration. Electrochemical measurements in aqueous H <sub>2</sub>SO <sub>4</sub> confirm the presence of two prominent redox waves consistent with polaron and bipolaron formation processes in the polyaniline-nanocellulose composite. Measurements with a polyaniline-nanocellulose film applied across an ITO junction (a 700 nm gap produced by ion beam milling) suggest a jump in electrical conductivity at ca. 0.2 V vs. SCE and a propagation rate (or percolation speed) two orders of magnitude slower compared to that observed in pure polyaniline This effect allows tuning of the propagation rate based on the nanostructure architecture. Film thickness-dependent electrocatalysis is observed for the oxidation of hydroquinone.</p>}}, author = {{Shariki, Sara and Liew, Soon Yee and Thielemans, Wim and Walsh, Darren A. and Cummings, Charles Y. and Rassaei, Liza and Wasbrough, Matthew J. and Edler, Karen J. and Bonné, Michael J. and Marken, Frank}}, issn = {{1432-8488}}, keywords = {{Cellulose; Electrocatalysis; Electrochromism; Junction; Layer-by-layer assembly; Nanocrystal; Nanofibril; PANI; Percolation; Phase propagation rate .Voltammetry; Polyaniline}}, language = {{eng}}, number = {{11-12}}, pages = {{2675--2681}}, publisher = {{Springer}}, series = {{Journal of Solid State Electrochemistry}}, title = {{Tuning percolation speed in layer-by-layer assembled polyaniline- nanocellulose composite films}}, url = {{http://dx.doi.org/10.1007/s10008-010-1261-z}}, doi = {{10.1007/s10008-010-1261-z}}, volume = {{15}}, year = {{2011}}, }