Journal ArticleDOI
Self-assembly of the 3-aminopropyltrimethoxysilane multilayers on Si and hysteretic current–voltage characteristics
Anil Kumar Chauhan,Dinesh K. Aswal,Shankar P. Koiry,Shiv K. Gupta,J. V. Yakhmi,Christoph Sürgers,David Guerin,Stéphane Lenfant,Dominique Vuillaume +8 more
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TLDR
In this paper, the authors reported the deposition of 3-aminopropyltrimethoxysilane (APTMS) multilayers on SiOx/Si(p++) substrates by a layer-by-layer self-assembly process.Abstract:
We report the deposition of 3-aminopropyltrimethoxysilane (APTMS) multilayers on SiOx/Si(p++) substrates by a layer-by-layer self-assembly process. The multilayers were grafted in a glove box having nitrogen ambient with both humidity and oxygen contents <1 ppm using APTMS solutions prepared in an anhydrous toluene. Deposition of the multilayers has been carried out as a function of solution concentration and grafting time. Characterization of the multilayers using static de-ionized water contact angle, ellipsometry, X-rayphotoelectron spectroscopy and atomic force microscope measurements revealed that self-assembling of the multilayers takes place in two distinct stages: (i) the first APTMS monolayer chemisorbs on a hydroxylated oxide surface by a silanization process and, (ii) the surface amino group of the first monolayer chemisorbs the hydrolyzed silane group of other APTMS molecules present in the solution, leading to the formation of a bilayer. The second stage is a self-replicating process that results in the layer-by-layer self-assembly of the multilayers with trapped NH3
+ ions. The current–voltage characteristics of the multilayers exhibit a hysteresis effect along with a negative differential resistance, suggesting their potential application in the molecular memory devices. A possible mechanism for the observed hysteresis effect based on filling and de-filling of the NH3
+ acting as traps is presented.read more
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Molecular self-assembled monolayers and multilayers for organic and unconventional inorganic thin-film transistor applications
TL;DR: In this paper, self-assembled monolayers and multilayers (SAMs) of organic molecules have been used to achieve low gate leakage currents and good chemical/thermal stability.
Journal ArticleDOI
XPS and NEXAFS studies of aliphatic and aromatic amine species on functionalized surfaces
Nora Graf,Eda Yegen,Thomas Gross,Andreas Lippitz,Wilfried Weigel,Simone Krakert,Andreas Terfort,Wolfgang E. S. Unger +7 more
TL;DR: In this article, a detailed XPS (X-ray photoelectron spectroscopy) and NEXAFS (Near edge X-ray absorption fine structure) database for amino functionalized surfaces is presented.
Journal ArticleDOI
Kinetics of (3-aminopropyl)triethoxylsilane (APTES) silanization of superparamagnetic iron oxide nanoparticles.
TL;DR: It is shown that initial silanization takes place very fast but the progress toward saturation is very slow, and the mechanism may involve adsorption, chemical sorption, and chemical diffusion processes.
Journal ArticleDOI
Surface charge mapping with a nanopipette.
TL;DR: The studies herein highlight the use of nanopipettes for functional imaging with applications from cell biology to materials characterization where understanding surface charge is of key importance and provide a framework for the design of SICM experiments, which may be convoluted by topographical and surface charge effects, especially for small nanopipette experiments.
Journal ArticleDOI
H2S sensing using in situ photo-polymerized polyaniline–silver nanocomposite films on flexible substrates
Ahmed Mekki,Ahmed Mekki,Nirav Joshi,Ajay Singh,Ajay Singh,Zakaria Salmi,P. Jha,Philippe Decorse,Stéphanie Lau-Truong,Rachid Mahmoud,Mohamed M. Chehimi,Dinesh K. Aswal,Shiv K. Gupta +12 more
TL;DR: In this paper, the authors demonstrate the preparation of flexible polyaniline-silver (PANI-Ag) nanocomposite films via an in situ facile UV induced polymerization of aniline in presence of AgNO 3.
References
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Journal ArticleDOI
Structure and reactivity of alkylsiloxane monolayers formed by reaction of alkyltrichlorosilanes on silicon substrates
TL;DR: In this article, the authors characterized the properties of ordered alkylsiloxane monolayer films and showed that they were stable in common organic solvents, water, and acid, but were destroyed by prolonged exposure to base.
Journal ArticleDOI
Electric Tunnel Effect between Dissimilar Electrodes Separated by a Thin Insulating Film
TL;DR: In this article, the theory of the electric tunnel effect has been extended to asymmetric junctions, i.e., junctions having electrodes of different materials, and it is found that the J-V characteristic is polarity-dependent.
Journal ArticleDOI
Comparison of Electronic Transport Measurements on Organic Molecules
Adi Salomon,David Cahen,Stuart Lindsay,John K. Tomfohr,Vincent B. Engelkes,C. Daniel Frisbie +5 more
TL;DR: In this article, experimental results on low bias, room-temperature currents through orgnaic molecules obtained in different electrode-molecule-electrode test-beds are discussed.
Journal ArticleDOI
Low-voltage organic transistors with an amorphous molecular gate dielectric
Marcus Halik,Hagen Klauk,Ute Zschieschang,Günter Schmid,Christine Dehm,Markus Dr. Schütz,Steffen Maisch,Franz Effenberger,Markus Brunnbauer,Francesco Stellacci +9 more
TL;DR: This work demonstrates a manufacturing process for TFTs with a 2.5-nm-thick molecular self-assembled monolayer (SAM) gate dielectric and a high-mobility organic semiconductor (pentacene), which operate with supply voltages of less than 2 V yet have gate currents that are lower than those of advanced silicon field-effect transistors with SiO2 dielectrics.