About: Self-assembled monolayer

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Self-assembled monolayers (SAM) of organic molecules are molecular assemblies formed spontaneously on surfaces by adsorption and are organized into more or less large ordered domains. In some cases molecules that form the monolayer do not interact strongly with the substrate. This is the case for instance of the two-dimensional supramolecular networks of e.g. perylenetetracarboxylic dianhydride (PTCDA) on gold or of e.g. porphyrins on highly oriented pyrolitic graphite (HOPG). In other cases the molecules possess a head group that has a strong affinity to the substrate and anchors the molecule to it. Such a SAM consisting of a head group, tail and functional end group is depicted in Figure 1. Common head groups include thiols, silanes, phosphonates, etc.

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rdfs:label	Selbstorganisierende Monoschicht (de) Αυτοσυναρμολογούμενες μονοστιβάδες (el) Monostrato auto-assemblato (it) 自己組織化単分子膜 (ja) Self-assembled monolayer (en) Самособирающиеся монослои (ru)
rdfs:comment	自己組織化単分子膜（じこそしきかたんぶんしまく、英: Self-Assembled Monolayer：SAM膜）とは自己組織化によって形成される単分子膜。 (ja) Самособирающиеся монослои (англ. self-assembled monolayers, сокр., SAM) — монослои амфифильных молекул, образовавшиеся на поверхности подложки (субстрата) путем самосборки. (ru) Οι αυτοσυναρμολογούμενες μονοστιβάδες ( SAM ) οργανικών μορίων είναι μοριακά συγκροτήματα που σχηματίζονται αυθόρμητα σε επιφάνειες με προσρόφηση και οργανώνονται σε περισσότερο ή λιγότερο μεγάλες διατεταγμένες περιοχές. Σε ορισμένες περιπτώσεις τα μόρια που σχηματίζουν τη μονοστιβάδα δεν αλληλεπιδρούν έντονα με το υπόστρωμα. Αυτό συμβαίνει, για παράδειγμα, με τα δισδιάστατα υπερμοριακά δικτύα π.χ. υπερυλενοτετρακαρβοξυλικού διανυδρίτη ( PTCDA ) σε χρυσό ή π.χ. πορφυρινών σε πυρολιτικό γραφίτη υψηλού προσανατολισμού (HOPG). Σε άλλες περιπτώσεις τα μόρια διαθέτουν μια ομάδα κεφαλής που έχει ισχυρή συγγένεια με το υπόστρωμα και αγκυρώνει το μόριο σε αυτό. Ένα τέτοιο SAM που αποτελείται από μια ομάδα κεφαλής, ουρά και λειτουργική ακραία ομάδα απεικονίζεται στο Σχήμα 1. Οι κοινές ομάδες (el) Die selbstorganisierende Monoschicht (engl. self-assembled monolayer, SAM) ist einwichtiger Bestandteil der Nanotechnologie. Eine selbstorganisierende Monoschicht bildet sich spontan beim Eintauchen von oberflächenaktiven oder organischen Substanzen in eine Lösung bzw. Suspension. Geeignete Substanzen sind dabei z. B. Alkanthiole, Alkyltrichlorsilane und Fettsäuren. Diese bilden auf Metallen wie Gold, Silber, Platin und Kupfer sowie Graphit und Silicium einfache Monoschichten mit einer hohen inneren Ordnung. Im Allgemeinen wird die Ausbildung von geordneten Schichten nur auf Terrassen der Einkristalle beobachtet, an Defekten wie Stufenversetzungen beobachtet man ein davon abweichendes Verhalten. (de) Self-assembled monolayers (SAM) of organic molecules are molecular assemblies formed spontaneously on surfaces by adsorption and are organized into more or less large ordered domains. In some cases molecules that form the monolayer do not interact strongly with the substrate. This is the case for instance of the two-dimensional supramolecular networks of e.g. perylenetetracarboxylic dianhydride (PTCDA) on gold or of e.g. porphyrins on highly oriented pyrolitic graphite (HOPG). In other cases the molecules possess a head group that has a strong affinity to the substrate and anchors the molecule to it. Such a SAM consisting of a head group, tail and functional end group is depicted in Figure 1. Common head groups include thiols, silanes, phosphonates, etc. (en) Un monostrato auto-assemblato o, secondo l'acronimo anglosassone, SAM (Self-Assembled Monolayer), è uno strato organizzato di molecole anfifiliche in cui una delle estremità della molecola, il “gruppo di testa” (head group), mostra una speciale affinità per un substrato. I SAM sono costituiti anche da una coda (tail) a cui può essere legato un gruppo funzionale nella parte finale come mostrato nella figura 1. Figure 1. Rappresentazione di una struttura di SAM (it)
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dcterms:subject	Supramolecular chemistry Nanotechnology Self-organization Thin films
Wikipage page ID	1753270 (xsd:integer)
Wikipage revision ID	1091157695 (xsd:integer)
Link from a Wikipage to another Wikipage	Proteins Electrophoretic deposition FDTS FTIR Nanoparticle Nanostructure Hydrophilic Perylenetetracarboxylic dianhydride Carbon nanotubes Atomic force microscope Covalent bonds Chemiresistor Chemisorption Ellipsometry Silanes Soft lithography Quartz crystal microbalance with dissipation monitoring Alexander Frumkin Fungus Molecules Contact angle Phosphonates Self-assembly Scanning vibrating electrode technique Microelectromechanical systems Cell (biology) Trichlorosilane Colloids Langmuir–Blodgett film Local oxidation nanolithography Northwestern University Supramolecular chemistry Biosensors Dip-pen nanolithography Dual polarisation interferometry Physical vapor deposition Atomic force microscopy Nanotechnology Self-organization Adsorption Chad Mirkin Laminar flow Thin films Biosensor Wetting X-ray photoelectron spectroscopy Porphyrins Field desorption Nanostructures HOPG HREELS Scanning tunneling microscopy Injection molding Nanoparticles Rain-X Hydroxyl Scanning tunneling microscope Second-harmonic generation Sum-frequency generation Ultraviolet Immunoassay Nanoelectromechanical systems Nanoimprint lithography PTCDA Van der Waals interactions Thiols

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