Low-temperature investigation of the growth mechanism of alkylsiloxane self-assembled monolayers

Glaser, A.; Foisner, J.; Friedbacher, G.; Hoffmann, H.
June 2004
Analytical & Bioanalytical Chemistry;Jun2004, Vol. 379 Issue 4, p653
Academic Journal
The growth behavior of self-assembled monolayer films strongly depends on parameters such as solvent, water concentration in the solvent, substrate type, and deposition method. A further parameter, the temperature, is of particular importance. It has been found that growth kinetics, size, and shape of the structures obtained strongly depend on the deposition temperature. Thus, exact adjustment and control of the solution temperature is of crucial importance for investigation of deposition mechanisms. The development of a temperature control unit has been the basis for a series of experiments on deposition of octadecyltrichlorosilane (OTS) on silicon wafers to study the influence of temperature on growth kinetics and film structure. Characterization of the films was performed with ellipsometry and atomic-force microscopy. It has been found that octadecylsiloxane (ODS) island sizes decrease with increasing temperature. Furthermore, a characteristic temperature exists above which increasingly disordered deposition occurs. At low temperatures (5–10 °C) smaller dot-like features are observed besides larger fractally shaped islands characteristic for self-assembly growth of ODS films. Our results indicate that these small dot-like features originate from ordered aggregates in the adsorption solution and that they are the precursors of the formation of larger islands. However, they can only be observed at low temperatures, because at room temperature they coalesce quickly to form larger units, due to the high surface mobility.


Related Articles

  • Effect of reduced dimensionality on the optical band gap of SrTiO3. Lee, Che-Hui; Podraza, Nikolas J.; Zhu, Ye; Berger, Robert F.; Shen, Shaoping; Sestak, Michelle; Collins, Robert W.; Kourkoutis, Lena F.; Mundy, Julia A.; Wang, Huiqiong; Mao, Qingyun; Xi, Xiaoxing; Brillson, Leonard J.; Neaton, Jeffrey B.; Muller, David A.; Schlom, Darrell G. // Applied Physics Letters;3/25/2013, Vol. 102 Issue 12, p122901 

    The effect of dimensional confinement on the optical band gap of SrTiO3 is investigated by periodically introducing one extra SrO monolayer every n SrTiO3 layers. The result is the n = 1-5 and 10 members of the Srn+1TinO3n+1 Ruddlesden-Popper homologous series. Spectroscopic ellipsometry,...

  • Study of Monolayer Films for Organic Solar Cells. Vidawati, Sri; Rothe, Ulrich; Soegijono, Bambang; Hikam, M. // AIP Conference Proceedings;9/14/2009, Vol. 1169 Issue 1, p127 

    We report on the deposition by Langmuir-Blodgett process of monolayer Tetraether lipids films were transferred onto Silicon wafer substrates. Langmuir experiments were performed with the Langmuir trough from a commercial film balance (Riegler & Kirstein GmbH, Mainz, Germany). The surface...

  • Novel cyanoterphenyl self-assembly monolayers on Au(111) studied by ellipsometry, x-ray photoelectron spectroscopy, and vibrational spectroscopies. Zhang, Hao-Li; Evans, Stephen D.; Critchley, Kevin; Fukushima, Hitoshi; Tamaki, Takashi; Fournier, Frédéric; Zheng, Wanquan; Carrez, Serge; Dubost, Henri; Bourguignon, Bernard // Journal of Chemical Physics;6/8/2005, Vol. 122 Issue 22, p224707 

    The self-assembled monolayers (SAMs) of two asymmetric disulfides derivatives (namely, LC1 and LC2) were prepared on Au(111). The disulfides contain a pure alkyl chain and an alkyl chain terminated by a cyanoterphenyl group. LC1 and LC2 differ by the way the cyanoterphenyl group is attached onto...

  • Skeletal silica characterization in porous-silica low-dielectric-constant films by infrared spectroscopic ellipsometry. Takada, Syozo; Hata, Nobuhiro; Seino, Yutaka; Fujii, Nobutoshi; Kikkawa, Takamaro // Journal of Applied Physics;6/1/2005, Vol. 97 Issue 11, p113504 

    Porous-silica low-dielectric-constant (low-k) films were prepared using a sol-gel method based on the self-assembly of surfactant templates. No change in the refractive index at 633 nm nor in the infrared-absorption intensities of C–H and O–H stretching vibrations at around 2900...

  • Lyo controversies. Pavlou, Fedra // Pharmaceutical Technology Europe;Mar2010, Vol. 22 Issue 3, p6 

    In this article, the author connotes the idea of lyophilisation on the views of Dr. Felix Franks regarding freezing and evaporation.

  • Reflection and transmission of light by dye monolayers. Orrit, Michel; Möbius, Dietmar; Lehmann, Urs; Meyer, Horst // Journal of Chemical Physics;11/1/1986, Vol. 85 Issue 9, p4966 

    Using a point-dipole model, we discuss short- and long-range interactions in a 2D array representing a monolayer. Long-range forces may be treated exactly if the film is homogeneous at the wavelength scale and if the effective polarizability including short-range forces is known. Reflection and...

  • Tensor analysis of the second-order nonlinear optical susceptibility of chiral anisotropic thin films. Kauranen, Martti; Van Elshocht, Sven; Verbiest, Thierry; Persoons, André // Journal of Chemical Physics;1/15/2000, Vol. 112 Issue 3 

    We present a new measurement technique based on second-harmonic generation to investigate thin molecular films with in-plane anisotropy. The technique does not rely on continuous azimuthal patterns of the second-harmonic intensities. Instead, the second-harmonic intensities are recorded at a...

  • Spatially resolved ellipsometry. Erman, M.; Theeten, J. B. // Journal of Applied Physics;8/1/1986, Vol. 60 Issue 3, p859 

    Formulates a spatially resolved ellipsometry using a convergent beam approach. Discussion on spatially resolved ellipsometry; Description of absolute ellipsometry on small size spatially homogenous samples; Analysis of laterally nonhomogenous samples.

  • Polarisation control of light by light in a nonlinear polymer. Pura, B.; Petykiewicz, J.; Adamowicz, L.; Jeda, W.; Wierzbicki, M.; Brudzewski, K. // Applied Physics B: Lasers & Optics;1998, Vol. 67 Issue 2, p211 

    Abstract. Ellipsometric measurements of polarisation of a light beam, called the signal beam, transmitted through a thin polymer layer affected by the influence of a stronger light beam, called the pump, with variable intensity for different polarisation and wavelength are reported. Polarisation...


Read the Article


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

Try another library?
Sign out of this library

Other Topics