Atomic Force Microscopy Study of β-Substituted-T7 Oligothiophene Films on Mica: Mechanical Properties and Humidity-Dependent Phases

Autor:	Imma Ratera, and Amanda R. Murphy, Miquel Salmeron, Jean M. J. Fréchet, D. F. Ogletree, Jinyu Chen
Rok vydání:	2004
Předmět:	chemistry.chemical_classification Annealing (metallurgy) Atomic force microscopy Humidity Surfaces and Interfaces Condensed Matter Physics chemistry Monolayer Electrochemistry Side chain Molecule Organic chemistry General Materials Science Mica Composite material Spectroscopy Alkyl
Zdroj:	Langmuir. 21:1080-1085
ISSN:	1520-5827 0743-7463
Popis:	The structural and mechanical properties of Langmuir-Blodgett monolayer and multilayer films of 3",4""-didecyl-5,2'; 5',2"; 5",2'''; 5''',2""; 5"",2'''''; 5''''',2"""-heptathiophene-4'''-acetic acid on mica have been studied by atomic force microscopy (AFM) as a function of humidity, temperature, and applied force. The molecules orient with the carboxylic acid group pointing toward the mica surface and expose the alkyl side chains to the air interface. As the load applied by the AFM tip increases, the film is compressed easily from an initial height of 2 to 1.2 nm. After compression the films can support much higher loads without loss of height. The state of aggregation of the molecules was found to be sensitive to the environmental humidity, which induced reversible changes. Annealing the samples with monolayer or multilayer films resulted in irreversible changes when the temperature exceeded approximately 100 degrees C.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::aef75dbb8cc5e691f87c61351b42d66d https://doi.org/10.1021/la040089c Zobrazit plný text záznamu