Details
| Original language | English |
|---|---|
| Pages (from-to) | 15272-15278 |
| Number of pages | 7 |
| Journal | Journal of Physical Chemistry C |
| Volume | 117 |
| Issue number | 29 |
| Publication status | Published - 25 Jul 2013 |
Abstract
Fluorine in polytetrafluoroethylene (PTFE) changes its states and transfers to titania by comilling and annealing of a titania-PTFE mixture. XPS, 19F MAS NMR, FT-IR, Raman spectra, TEM and EDX analyses consistently indicated the oxidative decomposition of PTFE, inducing partial fluorination of titania. Incorporation of fluorine into titania was unambiguously confirmed by the appearance of a new XPS F1s peak at ∼685 eV, similar to those observed from TiOF2. The intensity of the new F1s peak increased with comilling time and became a sole peak after milling for 3 h. At the same time, 19F MAS NMR lines specific to PTFE disappeared. From these observations, we concluded that extensive decomposition of PTFE with simultaneous change in the chemical states of fluorine took place with the aid of titania. Upon annealing the comilled mixture in air, the amount of fluorine in the mixture decreased with increasing temperature, while the remaining fluorine migrated into the titania lattice, as confirmed by the decrease in the chemical shift of the 19F MAS NMR lines and the decrease in the rutile (211) and (220) interplanar distances. These findings allow us to devise how to control the amount, states, and spatial distribution of the fluorine incorporated into titania.
ASJC Scopus subject areas
- Materials Science(all)
- Electronic, Optical and Magnetic Materials
- Energy(all)
- General Energy
- Chemistry(all)
- Physical and Theoretical Chemistry
- Materials Science(all)
- Surfaces, Coatings and Films
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In: Journal of Physical Chemistry C, Vol. 117, No. 29, 25.07.2013, p. 15272-15278.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Transfer and state changes of fluorine at polytetrafluoroethylene/titania boundaries by mechanical stressing and thermal annealing
AU - Senna, Mamoru
AU - Düvel, Andre
AU - Šepelák, Vladimir
AU - Shi, Jianmin
AU - Da Silva, Klebson Lucenildo
AU - Laporte, Vincent
AU - Lebedkin, Sergei
AU - Kübel, Christian
AU - Wang, Di
AU - Schünemann, Dennis
AU - Becker, Klaus Dieter
AU - Heitjans, Paul
PY - 2013/7/25
Y1 - 2013/7/25
N2 - Fluorine in polytetrafluoroethylene (PTFE) changes its states and transfers to titania by comilling and annealing of a titania-PTFE mixture. XPS, 19F MAS NMR, FT-IR, Raman spectra, TEM and EDX analyses consistently indicated the oxidative decomposition of PTFE, inducing partial fluorination of titania. Incorporation of fluorine into titania was unambiguously confirmed by the appearance of a new XPS F1s peak at ∼685 eV, similar to those observed from TiOF2. The intensity of the new F1s peak increased with comilling time and became a sole peak after milling for 3 h. At the same time, 19F MAS NMR lines specific to PTFE disappeared. From these observations, we concluded that extensive decomposition of PTFE with simultaneous change in the chemical states of fluorine took place with the aid of titania. Upon annealing the comilled mixture in air, the amount of fluorine in the mixture decreased with increasing temperature, while the remaining fluorine migrated into the titania lattice, as confirmed by the decrease in the chemical shift of the 19F MAS NMR lines and the decrease in the rutile (211) and (220) interplanar distances. These findings allow us to devise how to control the amount, states, and spatial distribution of the fluorine incorporated into titania.
AB - Fluorine in polytetrafluoroethylene (PTFE) changes its states and transfers to titania by comilling and annealing of a titania-PTFE mixture. XPS, 19F MAS NMR, FT-IR, Raman spectra, TEM and EDX analyses consistently indicated the oxidative decomposition of PTFE, inducing partial fluorination of titania. Incorporation of fluorine into titania was unambiguously confirmed by the appearance of a new XPS F1s peak at ∼685 eV, similar to those observed from TiOF2. The intensity of the new F1s peak increased with comilling time and became a sole peak after milling for 3 h. At the same time, 19F MAS NMR lines specific to PTFE disappeared. From these observations, we concluded that extensive decomposition of PTFE with simultaneous change in the chemical states of fluorine took place with the aid of titania. Upon annealing the comilled mixture in air, the amount of fluorine in the mixture decreased with increasing temperature, while the remaining fluorine migrated into the titania lattice, as confirmed by the decrease in the chemical shift of the 19F MAS NMR lines and the decrease in the rutile (211) and (220) interplanar distances. These findings allow us to devise how to control the amount, states, and spatial distribution of the fluorine incorporated into titania.
UR - http://www.scopus.com/inward/record.url?scp=84880815516&partnerID=8YFLogxK
U2 - 10.1021/jp4024926
DO - 10.1021/jp4024926
M3 - Article
AN - SCOPUS:84880815516
VL - 117
SP - 15272
EP - 15278
JO - Journal of Physical Chemistry C
JF - Journal of Physical Chemistry C
SN - 1932-7447
IS - 29
ER -