Electrodes for room-temperature and high-temperature electrical- property measurements were fabricated with fired-on silver paste (Johnson Matthey, E1100) and palladium paste (Gwent Electronic Materials Ltd., C2011004D5), respectively. Samples for piezoelectric measurements were poled in silicone oil at 200C under various di- rect-current (DC) electric fields (15±20 kVmm ±1 ). The piezoelectric constant d 33 was measured using a quasi-static d 33 meter (CAS, ZJ- 3B). The ferroelectric polarization±electric field (P±E) hysteresis loops were measured by a ferroelectric hysteresis measurement tester (NPL, UK). The temperature dependence of dielectric constant and loss were measured at 1 MHz using an Agilent 4284A LCR meter connected to a furnace. Thermal-depoling experiments were con- ducted by holding the poled samples with Pt electrodes for 2 h at var- ious high temperatures, cooling to room temperature, measuring d 33 , andrepeatingtheprocedureupto950C. 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Phys. 1980, 19,31. Self-Organization of Semiconducting Polysiloxane-Phthalocyanine on a Graphite Surface** By Paolo Samorí,* Hans Engelkamp, Pieter A. J. de Witte, Alan E. Rowan, Roeland J. M. Nolte,* and Jürgen P. Rabe* The fabrication of molecular or supramolecular wires [1] re- quires the design of rod-like objects with an intrinsic electrical conductivity, a notable stiffness, and a length on the order of tensofnanometers.Anorderedassemblyoftheseanisometric nanostructures should be possible in thin films. Post treat- ments such as thermal annealing have been successfully used to increase the degree of order in submicrometer sized molec- ular architectures assembled at surfaces [2±4] and,onthetensof nanometers scale, in long monodisperse alkane layers. [5] Scan- ning force microscopy (SFM) [6] and scanning tunneling mi- croscopy (STM) [7] offer direct access to the structural proper- ties of (macro)molecules over a wide range of length scales spanningfromthesubnanometeruptothemicrometerscale. [8] Here, we report on the effect of thermally induced self-or- ganization at elevated temperatures in dry ultrathin films con- sisting of rod-like semiconducting polymers, assembled on graphite and characterized on the single molecule scale. Moreover, we compare these results with those obtained by studying the solvent-induced columnar ordering of the same macromolecules at the solid±liquid interface. While the for- mer approach is technologically more interesting, the latter provides useful insight into the potential of the wet-processing to obtain ordered nanostructures at surfaces. The rod-like object chosen is a functionalized phthalocyan- inato-polysiloxane (PSPc) (Fig. 1). [9] Its monomeric phthalo- COMMUNICATIONS Adv. Mater. 2005, 17, 1265±1268 DOI: 10.1002/adma.200401825  2005 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim 1265 ______________________ ± [*] Dr. P. Samorí Instituto per la Sintesi Organica e la Fotoreattività, C.N.R. via Gobetti 101, I-40129 Bologna (Italy) E-mail: samori@isof.cnr.it Dr. P. Samorí, Dr. P. A. J. de Witte Institut de Science et d'IngØnierie SupramolØculaires UniversitØ Louis Pasteur 8 Rue Gaspard Monge, F-67000 Strasbourg (France) Prof. R. J. M. Nolte, Dr. H. Engelkamp, Prof. A. E. Rowan, Dr. P. A. J. de Witte NSRIM, Department of Organic Chemistry, University of Nijmegen Toernooiveld, NL-6525 ED Nijmegen (The Netherlands) E-mail: r.nolte@science.ru.nl Prof. J. P. Rabe Department of Physics, Humboldt University Berlin Newtonstrasse 15, D-12489 Berlin (Germany) E-mail: rabe@physik.hu-berlin.de [**] This work was supported by the EU through the TMR project SISI- TOMAS (project reference FMRX970099), and the Marie Curie EST project SUPER, by the Deutsche Forschungsgemeinschaft (Sfb448 ªMesoskopisch strukturierte Verbundsystemeº) and by the Eur- opean Science Foundation both through the SMARTON and the EUROCORES-SONS-BIONICS programmes. Supporting Informa- tion is available online from Wiley InterScience or from the author.