Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 1, Issue 1, Pages 341-345Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jz900178u
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Funding
- MICINN [MAT2007-61521, FIS2006-26391 EXPLORA]
- Generalitat de Catalunya [SGR2009-01225]
- MEC
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We report the first experimental evidence of size effects in the glass transition of thin films of an organic molecule grown from the vapor phase. In as-deposited films grown at 90 K (0.80T(g)), both the fictive temperature, T-1, and the Onset of the glass transition, T-on, decrease with thickness. The thinnestlayers (similar to 4 nm) exhibit the highest thermodynamic and lowest kinetic stability. Films refrozen at 2000 K/s after being heated to the liquid state during a previous scan demonstrate no size effects. The width of the glass transition for both as-deposited and refrozen films is independent of the film thickness down to 4 nm. Our heat capacity data suggest that ultrathin vapor-deposited glasses transform into liquid by a faster dynamic influenced by the outer film surface.
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