With Tag: Colloid And Surface Chemistry

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Nanostructure Transfer in Semiconductors by Ion Exchange

Rolf Könenkamp, Larissa Dloczik
Nano Letters | 2003 | 10.1021/nl0340879

We report a simple procedure for the transfer of a given nanostructure from a binary oxide semiconductor to binary chalcogenide compounds. The procedure involves two consecutive ion exchange steps performed in the gas phase and in solution. While there is a...


Tuning the Electronic and Chemical Properties of Monolayer MoS2 Adsorbed on Transition Metal Substrates

Elton J. G. Santos, Efthimios Kaxiras, Wei Chen, Wenguang Zhu, Zhenyu Zhang
Nano Lett. | 2013 | 10.1021/nl303909f

Using first-principles calculations within density functional theory, we investigate the electronic and chemical properties of a single-layer MoS 2 adsorbed on Ir(111), Pd(111), or Ru(0001), three representative transition metal substrates having varying...


Size-Dependence of Surface Plasmon Resonance and Oxidation for Pd Nanocubes Synthesized via a Seed Etching Process

Yadong Yin, Benjamin Wiley, Zhi-Yuan Li, Yujie Xiong, Younan Xia, Jingyi Chen
Nano Lett. | 2005 | 10.1021/nl0508826

Pd nanocubes between 8 and 50 nm in size were synthesized at the same concentration of Na 2 PdCl 4 precursor by controlling the number of seeds formed in the nucleation stage. Increasing the concentration of FeCl 3 , an oxidative etchant for Pd, reduced the...


Sacrificial Ionic Bonds Need To Be Randomly Distributed To Provide Shear Deformability

Peter Fratzl, Markus A. Hartmann
Nano Lett. | 2009 | 10.1021/nl901816s

Multivalent ions are known to allow for reversible cross-linking in soft biological materials, providing stiffness and extensibility via sacrificial bonds. We present a simple model where stiff nanoscale elements carrying negative charges are coupled in shear...


Nanostructured Gold Films for SERS by Block Copolymer-Templated Galvanic Displacement Reactions

Ulrich Gösele, Dong Ha Kim, Juan Peng, Jinquan Liu, Silke Christiansen, Li Wang, Yong Wang, Martin Steinhart, Michael Becker, Roland Scholz
Nano Lett. | 2009 | 10.1021/nl900939y

Up to now, little effort has been made to exploit large-area high-throughput patterning by block copolymer (BCP) lithography to generate nanostructured substrates with periods well below 100 nm for surface-enhanced Raman scattering (SERS). We show that simple...


Self-Assembly versus Directed Assembly of Nanoparticles via Pulsed Laser Induced Dewetting of Patterned Metal Films

Javier Diez, Philip D. Rack, Yueying Wu, Lou Kondic, Jason D. Fowlkes
Nano Lett. | 2011 | 10.1021/nl200921c

A nanoscale, synthetic perturbation was all that was required to nudge a natural, self-assembly process toward significantly higher order. Metallic thin film strips were transformed into nanoparticle arrays by nanosecond, liquid-phase dewetting. Arrays formed...


Superglide at an Internal Incommensurate Boundary

Damien Caliste, Tamara Radetic, Frédéric Lançon, Ulrich Dahmen, Andrew M. Minor, Jia Ye
Nano Lett. | 2010 | 10.1021/nl903885p

The intriguing possibility of frictionless gliding of one solid surface on another has been predicted for certain incommensurate interfaces in crystals, based on Aubry’s solution to the Frenkel−Kontorova model of a harmonic chain in a periodic potential...


Shape-Dependent Oriented Trapping and Scaffolding of Plasmonic Nanoparticles by Topological Defects for Self-Assembly of Colloidal Dimers in Liquid Crystals

Leonid Vigderman, Eugene R. Zubarev, Jao Van De Lagemaat, Ivan I. Smalyukh, Paul J. Ackerman, Taewoo Lee, Bohdan Senyuk, Pramit Manna, Julian S. Evans
Nano Lett. | 2012 | 10.1021/nl204030t

We demonstrate scaffolding of plasmonic nanoparticles by topological defects induced by colloidal microspheres to match their surface boundary conditions with a uniform far-field alignment in a liquid crystal host. Displacing energetically costly liquid...


Dimerization Boosts One-Dimensional Mobility of Conformationally Adapted Porphyrins on a Hexagonal Surface Atomic Lattice

M. Marschall, A. Schiffrin, M. Eichberger, H. J. Kreuzer, W. Auwärter, Y. Pennec, J. V. Barth, A. Weber-Bargioni, R. L. C. Wang, J. Reichert
Nano Lett. | 2008 | 10.1021/nl802995u

We employed temperature-controlled fast-scanning tunneling microscopy to monitor the diffusion of tetrapyridylporphyrin molecules on the Cu(111) surface. The data reveal unidirectional thermal migration of conformationally adapted monomers in the 300−360 K...


Assembly of Colloidal Semiconductor Nanorods in Solution by Depletion Attraction

Roberto Cingolani, Angela Fiore, Liberato Manna, Henny Zandbergen, Marco Zanella, Marijn Van Huis, Andrea Falqui, Cinzia Giannini, Ugo Lafont, Dmitry Baranov
Nano Lett. | 2010 | 10.1021/nl903946n

Arranging anisotropic nanoparticles into ordered assemblies remains a challenging quest requiring innovative and ingenuous approaches. The variety of interactions present in colloidal solutions of nonspherical inorganic nanocrystals can be exploited for this...


Interface-Induced Nucleation, Orientational Alignment and Symmetry Transformations in Nanocube Superlattices

William J. Baumgardner, Kaifu Bian, Tobias Hanrath, Joshua J. Choi, Detlef-M. Smilgies
Nano Lett. | 2012 | 10.1021/nl3026289

The self-assembly of colloidal nanocrystals into ordered superstructures depends critically on the shape of the nanocrystal building blocks. We investigated the self-assembly of cubic PbSe nanocrystals from colloidal suspensions in real-time using in situ...


Size Dependence of the Dispersion Relation for the Interface State between NaCl(100) and Ag(111)

André Sabellek, Sarah-Charlotta Heidorn, Karina Morgenstern
Nano Lett. | 2013 | 10.1021/nl403121t

This study investigates the interface state electron dispersion relation between NaCl(100) islands and Ag(111) dependent upon NaCl island size. Both onset energy and effective mass are size dependent. However, these dependencies are relevant at different...


Measuring Porosity at the Nanoscale by Quantitative Electron Tomography

L. Molina, K. J. Batenburg, G. Van Tendeloo, S. Bals, E. Biermans
Nano Lett. | 2010 | 10.1021/nl103172r

Quantitative electron tomography is proposed to characterize porous materials at a nanoscale. To achieve reliable three-dimensional (3D) quantitative information, the influence of missing wedge artifacts and segmentation methods is investigated. We are...


Electrokinetic Energy Conversion Efficiency in Nanofluidic Channels

Derek Stein, Frank H. J. Van Der Heyden, Christine Meyer, Cees Dekker, Douwe Jan Bonthuis
Nano Lett. | 2006 | 10.1021/nl061524l

We theoretically evaluate the prospect of using electrokinetic phenomena to convert hydrostatic energy to electrical power. An expression is derived for the energy conversion efficiency of a two-terminal fluidic device in terms of its linear electrokinetic...


Fullerene Crystals with Bimodal Pore Architectures Consisting of Macropores and Mesopores

Kun’ichi Miyazawa, Jonathan P. Hill, Katsuhiko Ariga, Yusuke Yamauchi, Lok Kumar Shrestha
J. Am. Chem. Soc. | 2012 | 10.1021/ja3108752

A new class of fullerene (C 60 ) crystals with bimodal pore architectures consisting of macropores and mesopores was synthesized by using a liquid–liquid interfacial precipitation (LLIP) method involving an interface between isopropyl alcohol (IPA) and a...


A Surface Site as Polydentate Ligand of a Metal Complex:  Density Functional Studies of Rhenium Subcarbonyls Supported on Magnesium Oxide

Konstantin M. Neyman, Notker Rösch, Anguang Hu, Markus Staufer, Bruce C. Gates, Thomas Belling
J. Am. Chem. Soc. | 1999 | 10.1021/ja990083n



Pt Fibers with Stacked Donut-Like Mesospace by Assembling Pt Nanoparticles: Guided Deposition in Physically Confined Self-Assembly of Surfactants

Kazuyuki Kuroda, Satoru Inoue, Tomota Nagaura, Yusuke Yamauchi, Azusa Takai
J. Am. Chem. Soc. | 2008 | 10.1021/ja800269c

A stacked donut-like mesospace is successfully introduced into Pt fibers by assembling Pt nanoparticles with uniform particle size, by utilizing the guided deposition of Pt nanoparticles in preferentially oriented liquid crystals. We clearly demonstrate that...


Reaction of Organosilicon Hydrides with Solid Surfaces:  An Example of Surface-Catalyzed Self-Assembly

Alexander Y. Fadeev, Roy Helmy, Robert W. Wenslow
J. Am. Chem. Soc. | 2004 | 10.1021/ja0498336

The solution-phase reactions of octadecylsilane (C 18 H 37 SiH 3 ) with 10 high surface area metal oxides (groups II−VIII) were investigated. C 18 H 37 SiH 3 reacted with most metal oxides at room temperature and produced supported monolayers (self-assembled...


Stresses at the Interface of Micro with Nano

Nicholas Leventis, Chariklia Sotiriou-Leventis, Xiaojiang Wang, Hongbing Lu, Sudhir Mulik, Amala Dass
J. Am. Chem. Soc. | 2007 | 10.1021/ja074010c

Bicontinuous meso/macroporous materials with ordered tubular mesopores are inherently unstable with stresses built in at the interface of the nano/micro fractal dimensions. This is concluded by comparing the macroscopic dimensions and the unit cell size of...


Molecular Recognition on a Cavitand-Functionalized Silicon Surface

Guglielmo G. Condorelli, Marco Montalti, Ignazio L. Fragalà, Chiara Massera, Luca Prodi, Maria Favazza, Monica Melegari, Enrico Dalcanale, Alessandro Motta, Elisa Biavardi
J. Am. Chem. Soc. | 2009 | 10.1021/ja901678b

A Si(100) surface featuring molecular recognition properties was obtained by covalent functionalization with a tetraphosphonate cavitand (Tiiii), able to complex positively charged species. Tiiii cavitand was grafted onto the Si by photochemical...

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