期刊
JOURNAL OF APPLIED PHYSICS
卷 118, 期 23, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4937565
关键词
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资金
- National Science Foundation [DMR-1262261]
- Office of Naval Research [N00014-11-0328]
- Knut and Alice Wallenberg foundation (Power Paper project) [KAW 2011.0050]
- Direct For Mathematical & Physical Scien [1262261] Funding Source: National Science Foundation
- Division Of Materials Research [1262261] Funding Source: National Science Foundation
We have used a photothermal technique, in which chopped light heats the front surface of a small (similar to 1 mm(2)) sample and the chopping frequency dependence of thermal radiation from the back surface is measured with a liquid-nitrogen-cooled infrared detector. In our system, the sample is placed directly in front of the detector within its dewar. Because the detector is also sensitive to some of the incident light, which leaks around or through the sample, measurements are made for the detector signal that is in quadrature with the chopped light. Results are presented for layered crystals of semiconducting 6,13-bis(triisopropylsilylethynyl) pentacene (TIPS-pn) and for papers of cellulose nanofibrils coated with semiconducting poly(3,4-ethylene-dioxythiophene): poly (styrene-sulfonate) (NFC-PEDOT). For NFC-PEDOT, we have found that the transverse diffusivity, smaller than the in-plane value, varies inversely with thickness, suggesting that texturing of the papers varies with thickness. For TIPS-pn, we have found that the interlayer diffusivity is an order of magnitude larger than the in-plane value, consistent with previous estimates, suggesting that low-frequency optical phonons, presumably associated with librations in the TIPS side groups, carry most of the heat. (C) 2015 AIP Publishing LLC.
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