PM-IRRAS mapping of ultrathin molecular films with high spatial resolution

Steiner, Gerald; Sablinskas, Valdas; Seidel, Wolfgang; Salzer, Reiner
November 2009
Analytical & Bioanalytical Chemistry;Nov2009, Vol. 395 Issue 6, p1641
Academic Journal
Polarization modulation infrared reflection absorption spectroscopy (PM-IRRAS) is a very sensitive technique to characterize the degree of molecular ordering in thin films on metallic surfaces. This is the first report of the coupling of a PM-IRRAS microscope to a free electron laser (FEL), a light source of highest brilliance. Some FELs emit in the infrared region and permit the mapping of molecular properties at high lateral resolution. We studied the molecular orientation of octadecanephosphonic acid (OPA) attached to a gold surface with microstructured aluminum oxide islands on the gold. The spatial resolution achieved is 12 μm which corresponds to the diffraction limit of the infrared light used in this study. This is a substantial improvement compared to previous studies using a PM-IRRA accessory together with a commercial Fourier transform infrared spectrometer, where the lateral resolution is noise-limited rather than diffraction-limited. The spectral maps reveal that OPA is preferably attached to the aluminum oxide islands via the bidentate binding mode whereas the tridentate mode is dominating in case of OPA attached to the gold areas.


Related Articles

  • Complementarity of real-time neutron and synchrotron radiation structural investigations in molecular biology. Aksenov, V.; Kiselev, M. // Crystallography Reports;Dec2010, Vol. 55 Issue 7, p1106 

    General problems of the complementarity of different physical methods and specific features of the interaction between neutron and matter and neutron diffraction with respect to the time of flight are discussed. The results of studying the kinetics of structural changes in lipid membranes under...

  • Molecular and electronic structure of electroactive self-assembled monolayers. Méndez De Leo, Lucila P.; de la Llave, Ezequiel; Scherlis, Damián; Williams, Federico J. // Journal of Chemical Physics;Mar2013, Vol. 138 Issue 11, p114707 

    Self-assembled monolayers (SAMs) containing electroactive functional groups are excellent model systems for the formation of electronic devices by self-assembly. In particular ferrocene-terminated alkanethiol SAMs have been extensively studied in the past. However, there are still open questions...

  • Towards Molecular Electronics: Solution-Based Methods for Selective Deposition of Metals and Semiconductors. Walker, Amy V. // AIP Conference Proceedings;10/20/2011, Vol. 1391 Issue 1, p12 

    Robust methods for the chemically selective deposition of metals, semiconductors, biomolecules and other substances are developed and applied in the construction of complex two-and three-dimensional structures. This work has important applications in molecular and organic electronics, sensing,...

  • Self-assembled monolayer-modified Ag anode for top-emitting polymer light-emitting diodes. Chong, Lai-Wan; Lee, Yuh-Lang; Wen, Ten-Chin; Guo, Tzung-Fang // Applied Physics Letters;12/4/2006, Vol. 89 Issue 23, p233513 

    A self-assembled monolayer (SAM), 4-fluorothiophenol (4-FTP), is employed to modify the Ag anode of a top-emitting polymer light-emitting diode (T-PLED) to enhance the hole injection and the performance of a T-PLED device. The results show that the reflectivity of the Ag anode does not decrease...

  • Cu-Cu Hermetic Seal Enhancement Using Self-Assembled Monolayer Passivation. Lim, D.; Fan, J.; Peng, L.; Leong, K.; Tan, C. // Journal of Electronic Materials;Mar2013, Vol. 42 Issue 3, p502 

    Low-temperature Cu-Cu thermocompression bonding enabled by self-assembled monolayer (SAM) passivation for hermetic sealing application is investigated in this work. Cavities are etched to a volume of 1.4 × 10 cm in accordance with the MIL-STD-883E standard prescribed for microelectronics...

  • Structure and stability of tilted-chain phases of alkanethiols on Au(111). Barrena, E.; Ocal, C.; Salmeron, M. // Journal of Chemical Physics;3/1/2001, Vol. 114 Issue 9 

    Presents evidence for the existence of ordered title-chain phases of self-assembled monolayers of C[sub 18] H[sub 37] SH alkylthiols (C18) on Au(111). Effect of loss of contact between chains on the loss of cohesive energy of the monomolecular films upon tilting; Stabilization of...

  • Study of the interaction potential between He and a self-assembled monolayer of decanethiol. Bracco, Gianangelo; Scoles, Giacinto // Journal of Chemical Physics;9/22/2003, Vol. 119 Issue 12, p6277 

    Self-assembled monolayers of decanethiol on Au(111) have been investigated by means of low energy He beam scattering. In particular the specular reflectivity has been measured and features associated with resonances due to bound states of He atom interacting with the CH[sub 3] groups of the...

  • Nonlinear optical properties of oligothiophene self-assembled monolayers on gold substrate. Mishina, E.; Miyakita, Y.; Yu, Q.-K.; Nakabayashi, S.; Sakaguchi, H. // Journal of Chemical Physics;8/22/2002, Vol. 117 Issue 8, p4016 

    Liner and nonlinear-optical properties of oligothiophenes self-assembled monolayers (SAM) are studied by optical second harmonic interference technique. Linear polarizability and first hyperpolarizability as functions of the number of thiophene rings are calculated using a self-consistent...

  • Low-energy ion-induced tensile stress of self-assembled alkanethiol monolayers. Itakura, A. N.; Berger, R.; Narushima, T.; Kitajima, M. // Applied Physics Letters;5/20/2002, Vol. 80 Issue 20, p3712 

    Monolayers of alkanethiols on gold have been exposed to low energy Ar ion. A micromechanical cantilever sensor technique was used to determine in situ the influence of the ion dose on the surface stress in the monolayers. In contrast to compressive surface stress during self-assembled monolayer...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics