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Titel
3D photografting with aromatic azides: A comparison between three-photon and two-photon case
VerfasserLi, Zhiquan ; Ajami, Aliasghar ; Stankevicius, Evaldas ; Husinsky, Wolfgang In der Gemeinsamen Normdatei der DNB nachschlagen ; Raciukaitis, Gediminas ; Stampfl, Jürgen In der Gemeinsamen Normdatei der DNB nachschlagen ; Liska, Robert In der Gemeinsamen Normdatei der DNB nachschlagen ; Ovsianikov, Aleksandr In der Gemeinsamen Normdatei der DNB nachschlagen
Erschienen in
Optical Materials, 2013, Jg. 35, H. 10, S. 1846-1851
Erschienen2013
Ausgabe
Accepted version
SpracheEnglisch
DokumenttypAufsatz in einer Zeitschrift
Schlagwörter (EN)Femtosecond / Multi-photon / Patterning / Functionalization / Microfabrication / Grafting
URNurn:nbn:at:at-ubtuw:3-1105 Persistent Identifier (URN)
DOIdoi:10.1016/j.optmat.2013.04.007 
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3D photografting with aromatic azides: A comparison between three-photon and two-photon case [1.32 mb]
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Zusammenfassung (Englisch)

Photografting is a method utilizing light activation for covalent incorporation of functional molecules to a polymer surface or polymer matrix. It has been widely applied as a simple and versatile method for tailoring physicalchemical properties of various surfaces. Grafting induced via multi-photon absorption provides additional advantages of spatial and temporal control of the process. Here, a novel fluoroaryl azide photografting compound (AFA) was synthesized and compared with the commercially available azide BAC-M. Using Z-scan technique, it was determined that AFA is a two-photon absorber at 798 nm, whereas BAC-M is a three-photon absorber at this wavelength. Both azides were employed for 3D photografting within a PEG-based matrix using femtosecond laser pulses. Both Z-scan measurements and 3D photografting tests indicated that, the intensity threshold for nonlinear absorption and photografting process is lower for AFA. As a result the processing window of AFA is much broader than that of BACM. But on the other hand, since BAC-M is characterized by the three-photon absorption (3PA) process, patterns with finer features can be produced using this molecule. The choice of the appropriate compound for 3D grafting will depend on the final application and the requirements associated with the resolution and post-modification protocol.