2024-03-28T10:03:50Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/884142022-12-15T08:22:51Zcom_10261_36com_10261_4col_10261_289
Fabrication and Mechanical Characterization of Semi-Free-Standing (Conjugated) Polymer Thin Films
Martín Pérez, Jaime
Muñoz Rojo, Miguel
Encinar, Mario
Calleja, Montserrat
Martín-González, Marisol
European Research Council
Polymers undergo severe low-dimensionality effects when they are confined to ultrathin films since most of the structural and dynamical processes involving polymer molecules are correlated to length scales of the order of nanometers. However, the real influence of the size limitation over such processes is often hard to identify as it is masked by interfacial effects. We present the fabrication of a new type of nanostructure consisting of poly[[9-(1-octylnonyl)-9H-carbazole-2,7-diyl]-2,5-thiophenediyl-2,1,3-benzothiadiazole-4,7-diyl-2,5-thiophenediyl] (PCDTBT) thin film that is held up exclusively over tips of poly(ether–ether–ketone) (PEEK) nanopillars. The fabrication method exploits the nonwetting behavior of PCDTBT onto an ordered PEEK nanopillar array when the mobility of the PCDTBT molecules is enhanced by a solvent annealing process. We use this new configuration to characterize the mechanical behavior of free-standing thin film regions, thus in the absence of underlaying substrate, by means of an atomic force microscope (AFM) setup. First, we study how the finite thickness and/or the presence of the underlying substrate influences the mechanical modulus of the material in the linear elastic regime. Moreover, we analyze deep indentations up to the rupture of the thin film, which allow for the measurement of important mechanical features of the nanoconfined polymer, such as its yield strain, the rupture strain, the bending rigidity, etc., which are impossible to investigate in thin films deposited on substrates.
This work was supported by the ERC Starting Grants “NanoTEC” (ERC-StG-2008-240497) and “NANOFORCELLS” (ERC-StG-2011-278860).
Peer reviewed
2013-12-11T08:30:55Z
2013-12-11T08:30:55Z
2014
artículo
http://purl.org/coar/resource_type/c_6501
Langmuir 30(18): 5217–5223 (2014)
0743-7463
http://hdl.handle.net/10261/88414
10.1021/la4032267
1520-5827
http://dx.doi.org/10.13039/501100000781
en
#PLACEHOLDER_PARENT_METADATA_VALUE#
#PLACEHOLDER_PARENT_METADATA_VALUE#
info:eu-repo/grantAgreement/EC/FP7/278860
info:eu-repo/grantAgreement/EC/FP7/240497
http://dx.doi.org/10.1021/la4032267
none
American Chemical Society