1996
DOI: 10.1021/jp952163t
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Dependences of Thermal Behaviors on the Number of Layers in Langmuir−Blodgett Films of 2-Octadecyl-7,7,8,8-tetracyanoquinodimethane. 1. Order−Disorder Transitions in the Films Investigated by Ultraviolet−Visible and Infrared Spectroscopies

Abstract: Dependences of thermal behaviors on the number of layers in Langmuir-Blodgett (LB) films of 7,8, have been investigated for both morphological and molecular structural aspects by using ultraviolet-visible (UV-vis) and infrared (IR) spectroscopies. The temperature-dependent morphological changes have been monitored by the base-line shift in the UV-vis spectra of the LB films. The changes in the base-line in the 450-600 nm region suggest that the domains in the one-layer film decompose progressively with tempera… Show more

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Cited by 51 publications
(90 citation statements)
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“…The cleaning procedure for these substrates was the same as that previously described. 1 In the AFM experiments, a NanoScopeIII (Digital Instruments) was used to investigate the morphology of the octadecyl-TCNQ LB films which had been built up onto silicon substrates (n-Si(100) surface) to achieve a high resolution. We used a silicon nitride tip on a cantilever with a spring constant of 0.6 N/m.…”
Section: Methodsmentioning
confidence: 99%
See 1 more Smart Citation
“…The cleaning procedure for these substrates was the same as that previously described. 1 In the AFM experiments, a NanoScopeIII (Digital Instruments) was used to investigate the morphology of the octadecyl-TCNQ LB films which had been built up onto silicon substrates (n-Si(100) surface) to achieve a high resolution. We used a silicon nitride tip on a cantilever with a spring constant of 0.6 N/m.…”
Section: Methodsmentioning
confidence: 99%
“…1 This paper discusses the dependences of annealing effects on the number of layers in the LB films. Studies of the annealing effects on the structure of LB films are very important from the viewpoints of both basic research and practical applications.…”
Section: Introductionmentioning
confidence: 99%
“…[ 100 ] Similar investigations have been performed, for example, on self-assembled monolayers [101][102][103][104][105][106] or Langmuir-Blodgett fi lms. [107][108][109][110] The position of two selected bands, the ν s (CH 2 ) modes (around 2850 cm − 1 ) and the ν as (CH 2 ) modes (around 2920 cm − 1 ), is displayed in Figure 7 b. As their position directly refl ects the conformational and structural changes related to the alkyl chains, they can be used as an indicator of the ordering process (see [ 100 ] and references therein).…”
Section: Adv Mater 2011 23 2571-2587mentioning
confidence: 99%
“…For example, the frequencies of the CH 2 antisymmetric and symmetric stretching bands are significantly different between them. 1,2 This implies a different stacking pattern of the hydrocarbon chains of octadecyl-TCNQ. It is well-known that appearances of the CH 2 antisymmetric and symmetric stretching bands at lower wavenumbers (ca 2918 and 2848 cm -1 , respectively) indicate a highly ordered and well-organized arrangement of the hydrocarbon chains, while their appearances at higher wavenumbers (ca 2926 and 2856 cm -1 ) are indicative of the increase in conformational disorder in the hydrocarbon chains.…”
Section: Stacking Pattern Of Alkyl Chains Of Octadecyl-tcnq Moleculesmentioning
confidence: 99%