About some properties of terthiophene thin films otained in the presence of a red hot wolfram filament

D’Almeida, K.; Bernède, J.C.; Martínez, Francisco; Tregouet, Y.; Louarn, G.; Neculqueo, Gloria; Lefrant, S.; Molinié, Philippe

doi:10.1016/s0379-6779(98)01142-4

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“…The two polymorphs were thus named high-and low-temperature (HT & LT) phases, respectively after such different temperature gradient conditions. In contrast, although there are found some studies on the vapor deposition of thiophen-oligomers 21) and their derivatives thin films as well as on their electropolymerization, 22) there have been not so many reports on the vapor deposition of 3T films, 23) nor on the IL-assisted vapor deposition of 3T crystals, from the aspect of their polymorphs control. In this study, we thus investigated possible effects of nanoscale IL on the growth and polymorphs control of 3T crystals in vapor deposition.…”

Section: Introductionmentioning

confidence: 99%

Ionic liquid-assisted vapor deposition and polymorphs control of 2,2′:5′,2″-terthiophene crystals

Okawara¹,

Maruyama

Matsumoto

2019

Jpn. J. Appl. Phys.

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In this work we investigated possible effects of nanoscale ionic liquid (IL) on the crystal growth of 2,2′:5′,2″-terthiophen (3T), a well-known oligomer source for conducting polymers, and its polymorphs control (high- and low-temperature phases, respectively) in vapor deposition. In the vapor deposition via a bulky IL droplet as well as without IL, the low-temperature phase was dominant at a deposition temperature as low as 6 °C–7 °C, and there were large 3T platelet single crystals (several tens of μm in size) of the low-temperature phase obtained in the bulky IL droplet. In contrast, when 3T molecules were deposited via thin film IL in the thickness range of 1–100 nm, the high-temperature phase could be much stabilized even at a deposition temperature of 6 °C, and especially for a few nm thick IL a nearly single high-temperature phase of 3T crystal films was effectively obtained.

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Section: Introductionmentioning

confidence: 99%