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With Tag: Colloid And Surface Chemistry

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Organizing Carbon Nanotubes with Liquid Crystals

David L. Patrick, Michael D. Lynch
Nano Letters | 2002 | 10.1021/nl025694j

Single- and multiwalled carbon nanotubes dispersed in nematic liquid crystal (LC) solvents are found to be orientationally ordered by the nematic matrix. Procedures are demonstrated for the preparation of monolayer and multilayer nanotube films with...

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Theory of Coherent Nucleation in Phase-Separating Nanoparticles

Martin Z. Bazant, Daniel A. Cogswell
Nano Lett. | 2013 | 10.1021/nl400497t

The basic physics of nucleation in solid single-crystal nanoparticles is revealed by a phase-field theory that includes surface energy, chemical reactions, and coherency strain. In contrast to binary fluids, which form arbitrary contact angles at surfaces,...

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Nanoparticle Networks on Silicon:  Self-Organized or Disorganized?

Matthew O. Blunt, Christopher P. Martin, Philip Moriarty
Nano Lett. | 2004 | 10.1021/nl048536w

A structural motif that appears very frequently not only in a wide range of nanostructured systems but also on mesoscopic to macroscopic length scales is the “cellular network”. We present a quantitative analysis of the morphology of cellular networks...

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Tungsten Nitride Inverse Opals by Atomic Layer Deposition

Roy G. Gordon, Alessandro Rugge, Jill S. Becker, Sarah H. Tolbert
Nano Letters | 2003 | 10.1021/nl034362r

In this letter, we demonstrate a new method of creating inverse opal structures by infiltrating thin-film colloidal crystals using atomic layer deposition (ALD) and then dissolving the templating particles. ALD offers several advantages over previous...

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Size-Selective Nanoparticle Growth on Few-Layer Graphene Films

Thomas Ly, A. T. Charlie Johnson, Zhengtang Luo, E. J. Mele, Luke A. Somers, Nicholas J. Kybert, Yaping Dan
Nano Lett. | 2010 | 10.1021/nl9026605

We observe that gold atoms deposited by physical vapor deposition onto few-layer graphenes condense upon annealing to form nanoparticles with an average diameter that is determined by the graphene film thickness. The data are well described by a theoretical...

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Molecular Motor-Powered Shuttles along Multi-walled Carbon Nanotube Tracks

Tomokazu Matsue, Javier Ramón-Azcón, Kelley Reaves, Winfried Teizer, Hitoshi Shiku, Wonmuk Hwang, Aurélien Sikora, Kyongwan Kim, Tadafumi Adschiri, Izumi Kumagai, Hikaru Nakazawa, Mitsuo Umetsu
Nano Lett. | 2014 | 10.1021/nl4042388

As a complementary tool to nanofluidics, biomolecular-based transport is envisioned for nanotechnological devices. We report a new method for guiding microtubule shuttles on multi-walled carbon nanotube tracks, aligned by dielectrophoresis on a functionalized...

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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...

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Supramolecular π-Stacked Assemblies of Bis(urea)-Substituted Thiophene Derivatives and Their Electronic Properties Probed with Scanning Tunneling Microscopy and Scanning Tunneling Spectroscopy

S. De Feyter, F. Schoonbeek, J. Van Esch, A. Gesquière, B. L. Feringa, R. M. Kellogg
Nano Letters | 2001 | 10.1021/nl015511d

In this contribution we investigated the two-dimensional (2D) supramolecular organization and electronic properties of two bis(urea)-substituted oligothiophene derivatives, containing two or three thiophene units (T2 and T3, respectively), at the...

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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...

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Focusing Nanocrystal Size Distributions via Production Control

Emory M. Chan, Michael D. Clark, Jonathan S. Owen, Sanat K. Kumar
Nano Lett. | 2011 | 10.1021/nl200286j

We present a theoretical description of how continuous monomer production affects the focusing of nanocrystal size distributions in solution. We show that sufficiently high monomer production rates can drive a decrease in the polydispersity even as the...

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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...

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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...

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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...

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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...

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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...

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Photoluminescence from Chemically Exfoliated MoS2

Manish Chhowalla, Mingwei Chen, Hisato Yamaguchi, Takeshi Fujita, Damien Voiry, Goki Eda
Nano Lett. | 2011 | 10.1021/nl201874w

A two-dimensional crystal of molybdenum disulfide (MoS 2 ) monolayer is a photoluminescent direct gap semiconductor in striking contrast to its bulk counterpart. Exfoliation of bulk MoS 2 via Li intercalation is an attractive route to large-scale synthesis...

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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...

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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...

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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...

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Are Bidentate Ligands Really Better than Monodentate Ligands For Nanoparticles?

Hiroko Takeuchi, Benard Omogo, Colin D. Heyes
Nano Lett. | 2013 | 10.1021/nl4023176

Coordinating ligands are widely used to vary the solubility and reactivity of nanoparticles for subsequent bioconjugation. Although long-term colloidal stability is enhanced by using bidentate coordinating ligands over monodentate ones, other properties such...

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