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Pileni MP. "Nano-egg" superstructures of hydrophobic nanocrystals dispersed in water. Phys Chem Chem Phys 2024; 26:16931-16941. [PMID: 38835199 DOI: 10.1039/d4cp01299b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/06/2024]
Abstract
In this feature article, we use hydrophobic ferrite (Fe3O4) nanocrystal shells filled with Au nanocrystals self-assembled into 3D superlattices and dispersed in water. These superstructures act as nano-heaters. The stability of such superstructures is very high, even for several years, when stored at room temperature. When subjected to an electron beam, the inverted structure of Fe3O4 structures is gradually dissolved due to the formation of hydrated electrons and hydroxyl radicals.
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Affiliation(s)
- M P Pileni
- Sorbonne Université, Department of Chemistry, 4 Place Jussieu, 75005 Paris, France.
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2
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Pileni MP. Superstructures of water-dispersive hydrophobic nanocrystals: specific properties. MATERIALS HORIZONS 2023; 10:4746-4756. [PMID: 37740284 DOI: 10.1039/d3mh00949a] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/24/2023]
Abstract
Here, we describe water-soluble superstructures of hydrophobic nanocrystals that have been developed in recent years. We will also report on some of their properties which are still in their infancy. One of these structures, called "cluster structures", consists of hydrophobic 3D superlattices of Co or Au nanocrystals, covered with organic molecules acting like parachutes. The magnetic properties of Co "cluster structures" a retained when the superstructures is dispersed in aqueous solution. With Au "cluster structures", the longer wavelength optical scattered spectra are very broad and red-shifted, while at shorter wavelengths the localized surface plasmonic resonance of the scattered nanocrystals is retained. Moreover, the maximum of the long-wavelength signal spectra is linearly dependent on the increase in assembly size. The second superstructure was based on liquid-liquid instabilities favoring the formation of Fe3O4 nanocrystal shells (colloidosomes) filled or unfilled with Au 3D superlattices and also spherical solid crystal structures are called supraballs. Colloidosomes and supraballs in contact with cancer cells increase the density of nanocrystals in lysosomes and near the lysosomal membrane. Importantly, the structure of their organization is maintained in lysosomes for up to 8 days after internalization, while the initially dispersed hydrophilic nanocrystals are randomly aggregated. These two structures act as nanoheaters. Indeed, due to the dilution of the metallic phase, the penetration depth of visible light is much greater than that of homogeneous metallic nanoparticles of similar size. This allows for a high average heat load overall. Thus, the organic matrix acts as an internal reservoir for efficient energy accumulation within a few hundred picoseconds. A similar behavior was observed with colloidosomes, supraballs and "egg" structures, making these superstructures universal nanoheaters, and the same behavior is not observed when they are not dispersed in water (dried and deposited on a substrate). Note that colloidosomes and supraballs trigger local photothermal damage inaccessible to isolated nanocrystals and not predicted by global temperature measurements.
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Affiliation(s)
- M P Pileni
- Sorbonne Université département de chimie, 4 Place Jussieu, 75005 Paris, France.
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3
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Pileni MP. Supraballs as spherical solid 3D superlattices of hydrophobic nanocrystals dispersed in water: nanoarchitectonics and properties. Phys Chem Chem Phys 2022; 24:14140-14149. [PMID: 35660817 DOI: 10.1039/d2cp00566b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Herein, we use a water-dispersive 3D suprastructure of ferrite (Fe3O4) nanocrystals called supraballs. They are solid spherical assemblies of hydrophobic nanocrystals with a rather low Young's modulus compared to similar 3D superlattices deposited on a substrate. Using atomic force microscopy methods, their nanomechanical properties are measured, which show small flexibility and deformation. This suprastructure behaves as a nanoheater and remains self-assembled after internalization in cancer cells. Furthermore, when subjected to light, the percentage of dead cells compared to the nanocrystals used as building blocks and dispersed in the solution increases.
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Affiliation(s)
- M P Pileni
- Sorbonne Université Department of Chemistry, 4 Place Jussieu, 75005 Paris, France.
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4
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Giuntini D, Zhao S, Krekeler T, Li M, Blankenburg M, Bor B, Schaan G, Domènech B, Müller M, Scheider I, Ritter M, Schneider GA. Defects and plasticity in ultrastrong supercrystalline nanocomposites. SCIENCE ADVANCES 2021; 7:eabb6063. [PMID: 33523985 PMCID: PMC7793591 DOI: 10.1126/sciadv.abb6063] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/06/2020] [Accepted: 11/19/2020] [Indexed: 05/16/2023]
Abstract
Supercrystalline nanocomposites are nanoarchitected materials with a growing range of applications but unexplored in their structural behavior. They typically consist of organically functionalized inorganic nanoparticles arranged into periodic structures analogous to crystalline lattices, including superlattice imperfections induced by processing or mechanical loading. Although featuring a variety of promising functional properties, their lack of mechanical robustness and unknown deformation mechanisms hamper their implementation into devices. We show that supercrystalline materials react to indentation with the same deformation patterns encountered in single crystals. Supercrystals accommodate plastic deformation in the form of pile-ups, dislocations, and slip bands. These phenomena occur, at least partially, also after cross-linking of the organic ligands, which leads to a multifold strengthening of the nanocomposites. The classic shear theories of crystalline materials are found to describe well the behavior of supercrystalline nanocomposites, which result to feature an elastoplastic behavior, accompanied by compaction.
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Affiliation(s)
- D Giuntini
- Institute of Advanced Ceramics, Hamburg University of Technology, Hamburg, Germany.
| | - S Zhao
- Department of Materials Science and Engineering, University of California, Berkeley, Berkeley 94720, USA
| | - T Krekeler
- Electron Microscopy Unit, Hamburg University of Technology, Hamburg, Germany
| | - M Li
- Institute of Materials Research, Helmholtz-Zentrum Geesthacht, Geesthacht, Germany
| | - M Blankenburg
- Institute of Materials Research, Helmholtz-Zentrum Geesthacht, Geesthacht, Germany
| | - B Bor
- Institute of Advanced Ceramics, Hamburg University of Technology, Hamburg, Germany
| | - G Schaan
- Electron Microscopy Unit, Hamburg University of Technology, Hamburg, Germany
| | - B Domènech
- Institute of Advanced Ceramics, Hamburg University of Technology, Hamburg, Germany
| | - M Müller
- Institute of Materials Research, Helmholtz-Zentrum Geesthacht, Geesthacht, Germany
| | - I Scheider
- Institute of Materials Research, Helmholtz-Zentrum Geesthacht, Geesthacht, Germany
| | - M Ritter
- Electron Microscopy Unit, Hamburg University of Technology, Hamburg, Germany
| | - G A Schneider
- Institute of Advanced Ceramics, Hamburg University of Technology, Hamburg, Germany
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5
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Hussein HEM, Amari H, Breeze BG, Beanland R, Macpherson JV. Controlling palladium morphology in electrodeposition from nanoparticles to dendrites via the use of mixed solvents. NANOSCALE 2020; 12:21757-21769. [PMID: 33094776 DOI: 10.1039/d0nr05630h] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
By changing the mole fraction of water (χwater) in the solvent acetonitrile (MeCN), we report a simple procedure to control nanostructure morphology during electrodeposition. We focus on the electrodeposition of palladium (Pd) on electron beam transparent boron-doped diamond (BDD) electrodes. Three solutions are employed, MeCN rich (90% v/v MeCN, χwater = 0.246), equal volumes (50% v/v MeCN, χwater = 0.743) and water rich (10% v/v MeCN, χwater = 0.963), with electrodeposition carried out under a constant, and high overpotential (-1.0 V), for fixed time periods (50, 150 and 300 s). Scanning transmission electron microscopy (STEM) reveals that in MeCN rich solution, Pd atoms, amorphous atom clusters and (majority) nanoparticles (NPs) result. As water content is increased, NPs are again evident but also elongated and defected nanostructures which grow in prominence with time. In the water rich environment, NPs and branched, concave and star-like Pd nanostructures are now seen, which with time translate to aggregated porous structures and ultimately dendrites. We attribute these observations to the role MeCN adsorption on Pd surfaces plays in retarding metal nucleation and growth.
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6
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Pileni MP. Light interactions with supracrystals either deposited on a substrate or dispersed in water. Inorg Chem Front 2020. [DOI: 10.1039/d0qi00353k] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Nanocrystals with low size distribution are able to self-assemble into a 3D crystalline structure called colloidal crystals or super/supracrystals.
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7
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Saloga PEJ, Thünemann AF. Microwave-Assisted Synthesis of Ultrasmall Zinc Oxide Nanoparticles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:12469-12482. [PMID: 31469279 DOI: 10.1021/acs.langmuir.9b01921] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
We report on ultrasmall zinc oxide single-crystalline nanoparticles of narrow size distribution and long-term colloidal stability. These oleate-stabilized nanoparticles were synthesized using microwave-assisted synthesis for 5 min, corresponding to a 99% decrease in synthesis time, when compared to the conventional synthesis method. It was observed that the average particle radius increases from 2.6 ± 0.1 to 3.8 ± 0.1 nm upon increasing synthesis temperature from 125 to 200 °C. This change also corresponded to observed changes in the optical band gap and the fluorescence energy of the particles, from 3.44 ± 0.01 to 3.36 ± 0.01 eV and from 2.20 ± 0.01 to 2.04 ± 0.01 eV, respectively. Small-angle X-ray scattering, dynamic light scattering, and UV-vis and fluorescence spectroscopy were employed for particle characterization. Debye-Scherrer analysis of the X-ray diffraction (XRD) pattern reveals a linear increase of the crystallite size with synthesis temperature. The consideration of the convolution of a Lorentz function with a Gaussian function for data correction of the instrumental peak broadening has a considerable influence on the values for the crystallite size. Williamson-Hall XRD analyses in the form of the uniform deformation model, uniform stress deformation model, and uniform deformation energy density model revealed a substantial increase of strain, stress, and deformation energy density of the crystallites with decreasing size. Exponential and power law models were utilized for quantification of strain, stress, and deformation energy density.
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Affiliation(s)
- Patrick E J Saloga
- Bundesanstalt für Materialforschung und -prüfung (BAM) , Unter den Eichen 87 , 12205 Berlin , Germany
- Freie Universität Berlin, Fachbereich Biologie, Chemie, Pharmazie , Takustraße 3 , 14195 Berlin , Germany
| | - Andreas F Thünemann
- Bundesanstalt für Materialforschung und -prüfung (BAM) , Unter den Eichen 87 , 12205 Berlin , Germany
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8
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Pileni MP. Au Supracrystal Growth Processes: Unexpected Morphologies. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2019. [DOI: 10.1246/bcsj.20180310] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- M. P. Pileni
- Sorbonne University, Department of Chemistry, 4 place Jussieu 75005, Paris, France
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9
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Wei J, Deeb C, Pelouard JL, Pileni MP. Influence of Cracks on the Optical Properties of Silver Nanocrystals Supracrystal Films. ACS NANO 2019; 13:573-581. [PMID: 30557505 DOI: 10.1021/acsnano.8b07435] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
Physical properties of nanocrystals self-assembled into 3D superlattices called supracrystals are highly specific with unexpected behavior. The best example to support such a claim was given through STM/STS experiments at low temperature of very thick supracrystals (around 1000 layers) where it was possible to image the surpracrystal surface and study their electronic properties. From previous studies, we know the optical properties of Ag nanocrystals self-assembled in a hexagonal network two-dimensional (2D) or by forming small 3D superlattices (from around 2 to 7 layers) are governed by dipolar interactions. Here, we challenge to study the optical properties of Ag supracrystals film characterized by large thicknesses (from around 27 to 180 Ag nanocrystals layers). In such experimental conditions, according to the classical Beer-Lambert law, the absorption of Ag films is expected to be very large, and the film transmission is close to zero. Very surprisingly, we observe reduced transmission intensity with an increase of the notch line width, in the 300-800 nm wavelength range, as the supracrystal film thickness increased. By calculating the transmission through the supracrystal films, we deduced that the films were dominated by the presence of cracks with wetting layers existing at their bottoms. This result was also confirmed by optical micrographs. The cracks widths increased with increasing the film thickness leading to more complex wetting layers. We also demonstrated the formation of small Ag clusters at the nanocrystal surface. These results provide some implications toward the design of plasmonic materials.
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Affiliation(s)
- Jingjing Wei
- Department of Chemistry , Sorbonne University , 4 Place Jussieu , 75005 Paris , France
| | - Claire Deeb
- MiNaO-Center for Nanoscience and Nanotechnology C2N, CNRS , Université Paris-Sud, Université Paris-Saclay , Boulevard Thomas Gobert, 91120 Palaiseau , France
| | - Jean-Luc Pelouard
- MiNaO-Center for Nanoscience and Nanotechnology C2N, CNRS , Université Paris-Sud, Université Paris-Saclay , Boulevard Thomas Gobert, 91120 Palaiseau , France
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10
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Guo W, Hassan ZM, Kübel C, Haldar R, Weidler PG, Heissler S, Peikert K, Fröba M, Redel E, Wöll C. MOF-templated synthesis of 3D Bi 2O 3 supracrystals with bcc packing. NANOSCALE 2018; 10:17099-17104. [PMID: 30179247 DOI: 10.1039/c8nr04204g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
We describe a non-conventional, MOF-based approach with modified linkers to fabricate 3D Bi2O3 supracrystals. The nanoparticle (NP) assembly exhibits bcc-packing, which is difficult to achieve with other methods. The NPs possess a very narrow size distribution. The individual NPs were synthesized inside the pores of a surface-mounted metal-organic framework (SURMOF) template via a photo-decomposition procedure. The supracrystals were thoroughly characterized using X-ray diffraction (XRD), infrared (IR) and Raman spectroscopy as well as high-resolution transmission electron microscopy (HR-TEM) and SAED (Selected Area Electron Diffraction). In order to achieve sharp size distributions of the NPs, the pores within the SURMOF were functionalized with amino (-NH2) functional groups acting as nucleation centers. MOFs lacking such additional functionalities, Cu3(BTC)2, yielded much broader size distributions. These findings provide a unique molecular design tool for creating nanometer-sized reaction compartments for the synthesis of supracrystals with packing types not accessible via self-assembly.
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Affiliation(s)
- Wei Guo
- Karlsruhe Institute of Technology, Institute of Functional Interfaces (IFG), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.
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11
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Smilgies DM, Li R, Pileni MP. Au nanocrystal superlattices: nanocrystallinity, vicinal surfaces, and growth processes. NANOSCALE 2018; 10:15371-15378. [PMID: 30083696 DOI: 10.1039/c8nr04606a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Vicinal Au supracrystal surfaces were prepared from Ausingle single domain nanocrystals (NCs), whereas by replacing Ausingle with their polycrystalline counterparts common low-energy supracrystal surfaces were produced. By analogy to atomic crystalline surfaces, we propose a mechanism to explain the formation of such unexpected supracrystal vicinal surfaces, composed of only Ausingle NCs which are non-compact (bct structure) with a coherent alignment of the atomic planes oriented along the [111] superlattice axis and a slight tilt configuration (8.1°) of NCs. In the presence of Co(ε) NCs, these Ausingle supracrystals lose both the slightly tilted configuration of NCs and their orientational order leading to a superlattice transition from bct to fcc. In contrast, supracrystals of Aupoly NCs are insensitive to the presence of Co(ε) NCs. These intriguing structural changes obtained with Ausingle compared to Aupoly supracrystals in the absence and presence of Co(ε) NCs could explain the formation of vicinal surfaces. Note that the solvent used to disperse the nanocrystals plays a key role in the formation of supracrystal vicinal surfaces. Here, a new analogy between supracrystals and atomic crystals is presented.
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Affiliation(s)
- Detlef-M Smilgies
- Cornell High Energy Synchrotron Source (CHESS), Cornell University, Ithaca, New York 14853, USA
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12
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Maity A, Das A, Sen D, Mazumder S, Polshettiwar V. Unraveling the Formation Mechanism of Dendritic Fibrous Nanosilica. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:13774-13782. [PMID: 29111749 DOI: 10.1021/acs.langmuir.7b02996] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
We studied the formation mechanism of dendritic fibrous nanosilica (DFNS) that involves several intriguing dynamical steps. Through electron microscopy and real-time small-angle X-ray scattering studies, it has been demonstrated that the structural evolution of bicontinuous microemulsion droplets (BMDs) and their subsequent coalescence, yielding nanoreactor template, is responsible for to the formation of complex DFNS morphology. The role of cosurfactant has been found to be quite crucial, which allowed the understanding of this intricate mechanism involving the complex interplay of self-assembly, dynamics of BMDs formation, and coalescence. The role of BMDs in formation of DFNS has not been reported so far and the present work allows a deeper molecular-level understanding of DFNS formation.
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Affiliation(s)
- Ayan Maity
- Department of Chemical Sciences, Tata Institute of Fundamental Research (TIFR) , Mumbai 400 005, India
| | - Avik Das
- Solid State Physics Division, Bhabha Atomic Research Centre (BARC), and Homi Bhabha National Institute , Anushaktinagar, Mumbai 400 085, India
| | - Debasis Sen
- Solid State Physics Division, Bhabha Atomic Research Centre (BARC), and Homi Bhabha National Institute , Anushaktinagar, Mumbai 400 085, India
| | - Subhasish Mazumder
- Solid State Physics Division, Bhabha Atomic Research Centre (BARC), and Homi Bhabha National Institute , Anushaktinagar, Mumbai 400 085, India
| | - Vivek Polshettiwar
- Department of Chemical Sciences, Tata Institute of Fundamental Research (TIFR) , Mumbai 400 005, India
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13
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Pileni MP. Impact of the Metallic Crystalline Structure on the Properties of Nanocrystals and Their Mesoscopic Assemblies. Acc Chem Res 2017; 50:1946-1955. [PMID: 28726381 DOI: 10.1021/acs.accounts.7b00093] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
The spontaneous assembly of uniform-sized globular entities into ordered arrays is a universal phenomenon observed for objects with diameters spanning a broad range of length scales. These extend from the atomic scale (10-8 cm), through molecular and macromolecular scales with proteins, synthetic low polymers, and colloidal crystals (∼10-6 cm), to the wavelength of visible light (∼10-5 cm). The associated concepts of sphere packing have had an influence in diverse fields ranging from pure geometrical analysis to architectural models or ideals. Self-assembly of atoms, supramolecules, or nanocrystals into ordered functional superstructures is a universal process and prevalent topic in science. About five billion years ago in the early solar system, highly uniform magnetite particles of a few hundred nanometers in size were assembled in 3D arrays.1 Thirty million years ago, silicate particles with submicrometer size were self-organized in the form of opal.2 Opal is colorless when composed of disordered silicate microparticles whereas it shows specific reflectivity when particles order in arrays. Nowadays, nanocrystals, characterized by a narrow size distribution and coated with alkyl chains to maintain their integrity, self-assemble to form crystallographic orders called supracrystals. Nanocrystals and supracrystals are arrangements of highly ordered atoms and nanocrystals, respectively. The morphologies of nanocrystals, supracrystals, and minerals are similar at various scales from nanometer to millimeter scale.3,4 Such suprastructures, which enable the design of novel materials, are expected to become one of the main driving forces in material research for the 21st century.5,6 Nanocrystals vibrate coherently in a supracrystal as atoms in a nanocrystal. Longitudinal acoustic phonons are detected in supracrystals as with atomic crystals, where longitudinal acoustic phonons propagate through coherent movements of atoms of the lattice out of their equilibrium positions. These vibrational properties show a full analogy with atomic crystals: In supracrystals, atoms are replaced by (uncompressible) nanocrystals and atomic bonds by coating agents (carbon chains), which act like mechanical springs holding together the nanocrystals. Electronic properties of very thick (more than a few micrometers) supracrystals reveal homogeneous conductance with the fingerprint of the isolated nanocrystal. Triangular single crystals formed by heat-induced (50 °C) coalescence of thin supracrystals deposited on a substrate as epitaxial growth of metal particles on a substrate with specific orientation produced by ultrahigh vacuum (UHV). Here we demonstrate that marked changes can occur in the chemical and physical properties of nanocrystals differing by their nanocrystallinity, that is, their crystalline structure. Furthermore, the properties (mechanical, growth processes) of supracrystals also change with the nanocrystallinity of the nanoparticles used as building blocks.
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Çolak A, Wei J, Arfaoui I, Pileni MP. Coating agent-induced mechanical behavior of 3D self-assembled nanocrystals. Phys Chem Chem Phys 2017; 19:23887-23897. [DOI: 10.1039/c7cp02649h] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The Young's modulus of three-dimensional self-assembled Ag nanocrystals, as so-called supracrystals, is correlated with the type of coating agent as well as the nanocrystal morphology.
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Affiliation(s)
- Arzu Çolak
- Sorbonne Universités
- UPMC Univ Paris 06
- UMR 8233
- MONARIS
- Paris
| | - Jingjing Wei
- Sorbonne Universités
- UPMC Univ Paris 06
- UMR 8233
- MONARIS
- Paris
| | - Imad Arfaoui
- Sorbonne Universités
- UPMC Univ Paris 06
- UMR 8233
- MONARIS
- Paris
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15
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Roland S, Ling X, Pileni MP. N-Heterocyclic Carbene Ligands for Au Nanocrystal Stabilization and Three-Dimensional Self-Assembly. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:7683-96. [PMID: 27412075 PMCID: PMC4980691 DOI: 10.1021/acs.langmuir.6b01458] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/15/2016] [Revised: 07/13/2016] [Indexed: 05/19/2023]
Abstract
N-Heterocyclic carbenes (NHCs) have emerged as a new class of ligands for materials chemistry that appears particularly relevant for the stabilization and functionalization of metal nanoparticles (NPs). The particular properties and high synthetic flexibility of NHCs make them highly attractive tools for the development of new (nano)materials and the fundamental study of their properties. The relationships between the NHC structure and NP structure/properties, including physical, biological, and self-assembly properties, remain largely unknown. In the past decade, many efforts have been made to gain more fundamental understanding in this area. In this feature article, we present our contribution in this field focusing on the formation of NHC-coated Au nanocrystals (NCs), their stability, and their ability to self-assemble into 3D crystalline structures called supracrystals. First, the formation of NHC-stabilized Au NCs is discussed by comparing different NHC structures, NHC-based Au precursors, and synthesis methods. This study shows the major role of the NHC structure in obtaining both stable NHC-coated Au NCs and narrow size distributions. In a second part, a comparative study of the oxygen resistance of NHC- and thiol-coated NCs is presented, demonstrating the enhanced stability of NHC-coated Au NCs to oxygen-based treatments. Finally, the self-assembly of NHC-coated Au NCs into 3D Au superlattices is presented. The formation of large organized domains of several micrometers is described from the design of NHCs tailored with long alkyl chains. In these different contexts, efforts have been made to gain a more in-depth understanding of the behavior of NHC ligands at the surface of NCs. These results show that the NHC-based approach to nanomaterials has many assets for opening a new research area in the supracrystal world.
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Affiliation(s)
- Sylvain Roland
- Institut Parisien
de Chimie Moléculaire, Sorbonne Universités,
UPMC-Univ Paris 6, UMR CNRS 8232, F-75005 Paris, France
| | - Xiang Ling
- Institut Parisien
de Chimie Moléculaire, Sorbonne Universités,
UPMC-Univ Paris 6, UMR CNRS 8232, F-75005 Paris, France
- MONARIS,Sorbonne Universités, UPMC-Univ Paris 6, UMR CNRS 8233, F-75005 Paris, France
| | - Marie-Paule Pileni
- MONARIS,Sorbonne Universités, UPMC-Univ Paris 6, UMR CNRS 8233, F-75005 Paris, France
- CEA/IRAMIS, CEA
Saclay, 91191 Gif-Sur-Yvette, France
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16
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Gwo S, Chen HY, Lin MH, Sun L, Li X. Nanomanipulation and controlled self-assembly of metal nanoparticles and nanocrystals for plasmonics. Chem Soc Rev 2016; 45:5672-5716. [PMID: 27406697 DOI: 10.1039/c6cs00450d] [Citation(s) in RCA: 127] [Impact Index Per Article: 15.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Localized surface plasmon resonances (LSPRs) associated with metallic nanostructures offer unique possibilities for light concentration beyond the diffraction limit, which can lead to strong field confinement and enhancement in deep subwavelength regions. In recent years, many transformative plasmonic applications have emerged, taking advantage of the spectral and spatial tunability of LSPRs enabled by near-field coupling between constituent metallic nanostructures in a variety of plasmonic metastructures (dimers, metamolecules, metasurfaces, metamaterials, etc.). For example, the "hot spot" formed at the interstitial site (gap) between two coupled metallic nanostructures in a plasmonic dimer can be spectrally tuned via the gap size. Capitalizing on these capabilities, there have been significant advances in plasmon enhanced or enabled applications in light-based science and technology, including ultrahigh-sensitivity spectroscopies, light energy harvesting, photocatalysis, biomedical imaging and theranostics, optical sensing, nonlinear optics, ultrahigh-density data storage, as well as plasmonic metamaterials and metasurfaces exhibiting unusual linear and nonlinear optical properties. In this review, we present two complementary approaches for fabricating plasmonic metastructures. We discuss how meta-atoms can be assembled into unique plasmonic metastructures using a variety of nanomanipulation methods based on single- or multiple-probes in an atomic force microscope (AFM) or a scanning electron microscope (SEM), optical tweezers, and focused electron-beam nanomanipulation. We also provide a few examples of nanoparticle metamolecules with designed properties realized in such well-controlled plasmonic metastructures. For the spatial controllability on the mesoscopic and macroscopic scales, we show that controlled self-assembly is the method of choice to realize scalable two-dimensional, and three-dimensional plasmonic metastructures. In the section of applications, we discuss some key examples of plasmonic applications based on individual hot spots or ensembles of hot spots with high uniformity and improved controllability.
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Affiliation(s)
- Shangjr Gwo
- Department of Physics, National Tsing-Hua University, Hsinchu 30013, Taiwan.
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17
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Stolarczyk JK, Deak A, Brougham DF. Nanoparticle Clusters: Assembly and Control Over Internal Order, Current Capabilities, and Future Potential. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2016; 28:5400-24. [PMID: 27411644 DOI: 10.1002/adma.201505350] [Citation(s) in RCA: 63] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2015] [Revised: 01/08/2016] [Indexed: 05/18/2023]
Abstract
The current state of the art in the use of colloidal methods to form nanoparticle assemblies, or clusters (NPCs) is reviewed. The focus is on the two-step approach, which exploits the advantages of bottom-up wet chemical NP synthesis procedures, with subsequent colloidal destabilization to trigger assembly in a controlled manner. Recent successes in the application of functional NPCs with enhanced emergent collective properties for a wide range of applications, including in biomedical detection, surface enhanced Raman scattering (SERS) enhancement, photocatalysis, and light harvesting, are highlighted. The role of the NP-NP interactions in the formation of monodisperse ordered clusters is described and the different assembly processes from a wide range of literature sources are classified according to the nature of the perturbation from the initial equilibrium state (dispersed NPs). Finally, the future for the field and the anticipated role of computational approaches in developing next-generation functional NPCs are briefly discussed.
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Affiliation(s)
- Jacek K Stolarczyk
- Photonics and Optoelectronics Group, Department of Physics and Center for NanoScience (CeNS), Ludwig-Maximilians-Universität München, Amalienstrasse 54, 80799, Munich, Germany
- Nanosystems Initiative Munich (NIM), Schellingstrasse 4, Munich, 80799, Germany
| | - Andras Deak
- Institute for Technical Physics and Materials Science, HAS Centre for Energy Research, P.O. Box 49, H-1525, Budapest, Hungary
| | - Dermot F Brougham
- National Institute for Cellular Biotechnology, School of Chemical Sciences, Dublin City, Glasnevin, Dublin 9, Ireland
- School of Chemistry, University College Dublin, Belfield, Dublin 4, Ireland
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18
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Diodati S, Dolcet P, Casarin M, Gross S. Pursuing the Crystallization of Mono- and Polymetallic Nanosized Crystalline Inorganic Compounds by Low-Temperature Wet-Chemistry and Colloidal Routes. Chem Rev 2015; 115:11449-502. [DOI: 10.1021/acs.chemrev.5b00275] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Stefano Diodati
- Dipartimento
di Scienze Chimiche, Università degli Studi di Padova, via
Marzolo, 1, I-35131, Padova, Italy
| | - Paolo Dolcet
- Dipartimento
di Scienze Chimiche, Università degli Studi di Padova, via
Marzolo, 1, I-35131, Padova, Italy
- Istituto per l’Energetica e le Interfasi, IENI-CNR and INSTM, UdR Padova, via Marzolo, 1, I-35131, Padova, Italy
| | - Maurizio Casarin
- Dipartimento
di Scienze Chimiche, Università degli Studi di Padova, via
Marzolo, 1, I-35131, Padova, Italy
- Istituto per l’Energetica e le Interfasi, IENI-CNR and INSTM, UdR Padova, via Marzolo, 1, I-35131, Padova, Italy
| | - Silvia Gross
- Dipartimento
di Scienze Chimiche, Università degli Studi di Padova, via
Marzolo, 1, I-35131, Padova, Italy
- Istituto per l’Energetica e le Interfasi, IENI-CNR and INSTM, UdR Padova, via Marzolo, 1, I-35131, Padova, Italy
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Sweetman A, Goubet N, Lekkas I, Pileni MP, Moriarty P. Nano-contact microscopy of supracrystals. BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2015; 6:1229-36. [PMID: 26114081 PMCID: PMC4462851 DOI: 10.3762/bjnano.6.126] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/31/2014] [Accepted: 05/04/2015] [Indexed: 05/13/2023]
Abstract
BACKGROUND Highly ordered three-dimensional colloidal crystals (supracrystals) comprised of 7.4 nm diameter Au nanocrystals (with a 5% size dispersion) have been imaged and analysed using a combination of scanning tunnelling microscopy and dynamic force microscopy. RESULTS By exploring the evolution of both the force and tunnel current with respect to tip-sample separation, we arrive at the surprising finding that single nanocrystal resolution is readily obtained in tunnelling microscopy images acquired more than 1 nm into the repulsive (i.e., positive force) regime of the probe-nanocrystal interaction potential. Constant height force microscopy has been used to map tip-sample interactions in this regime, revealing inhomogeneities which arise from the convolution of the tip structure with the ligand distribution at the nanocrystal surface. CONCLUSION Our combined STM-AFM measurements show that the contrast mechanism underpinning high resolution imaging of nanoparticle supracrystals involves a form of nanoscale contact imaging, rather than the through-vacuum tunnelling which underpins traditional tunnelling microscopy and spectroscopy.
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Affiliation(s)
- Adam Sweetman
- The School of Physics and Astronomy, The University of Nottingham, Nottingham, NG7 2RD, U.K
| | - Nicolas Goubet
- Sorbonne Universités, UPMC Univ Paris 06, UMR 8233, Monaris, F-75005, Paris, France
- CNRS, UMR 8233, Monaris, F-75005, Paris, France
| | - Ioannis Lekkas
- The School of Physics and Astronomy, The University of Nottingham, Nottingham, NG7 2RD, U.K
| | - Marie Paule Pileni
- Sorbonne Universités, UPMC Univ Paris 06, UMR 8233, Monaris, F-75005, Paris, France
- CNRS, UMR 8233, Monaris, F-75005, Paris, France
- CEA/IRAMIS, CEA Saclay, 91191, Gif-sur-Yvette, France
| | - Philip Moriarty
- The School of Physics and Astronomy, The University of Nottingham, Nottingham, NG7 2RD, U.K
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20
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Zheng Y, Luo M, Tao J, Peng HC, Wan D, Zhu Y, Xia Y. Seed-Mediated Growth of Gold Nanocrystals: Changes to the Crystallinity or Morphology as Induced by the Treatment of Seeds with a Sulfur Species. J Phys Chem B 2014; 118:14132-9. [DOI: 10.1021/jp506328p] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Yiqun Zheng
- School
of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
| | - Ming Luo
- The
Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, Georgia 30332, United States
- Key
Laboratory of Analytical Chemistry for Biology and Medicine, Ministry
of Education, College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, P. R. China
| | - Jing Tao
- Condensed
Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, United States
| | - Hsin-Chieh Peng
- School
of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
| | - Dehui Wan
- The
Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, Georgia 30332, United States
| | - Yimei Zhu
- Condensed
Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, United States
| | - Younan Xia
- School
of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
- The
Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, Georgia 30332, United States
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21
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Pileni MP, Davide Cozzoli P, Pinna N. Self-assembled supracrystals and hetero-structures made from colloidal nanocrystals. CrystEngComm 2014. [DOI: 10.1039/c4ce90127d] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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22
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Tang Y, Wang HT, Chen M, Qian DJ, Zhang L, Liu M. Silver(I)-directed growth of metal-organic complex nanocrystals with bidentate ligands of hydroquinine anthraquinone-1,4-diyl diethers as linkers at the water-chloroform interface. NANOSCALE RESEARCH LETTERS 2014; 9:488. [PMID: 25246874 PMCID: PMC4170212 DOI: 10.1186/1556-276x-9-488] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/23/2014] [Accepted: 09/07/2014] [Indexed: 06/03/2023]
Abstract
Immiscible liquid-liquid interfaces provide unique double phase regions for the design and construction of nanoscale materials. Here, we reported Ag(I)-directed growth of metal-organic complex nanocrystals by using AgNO3 as a connector in the aqueous solution and bidentate ligand of 1,4-bis(9-O-dihydroquininyl)anthraquinone [(DHQ)2AQN] and its enantiomer of (DHQD)2AQN in the chloroform solutions as linkers. The Ag-(DHQ)2AQN and Ag-(DHQD)2AQN complex nanocrystals were formed at the liquid-liquid interfaces and characterized by using UV-vis absorption and fluorescence spectroscopy and X-ray photoelectron spectroscopy, as well as by using scanning electron microscopy. Screw-like nanocrystals were formed at the initial 30 min after the interfacial coordination reaction started, then they grew into nanorods after several days, and finally became cubic microcrystals after 2 weeks. The pure ligand showed two emission bands centered at about 363 and 522 nm in the methanol solution, the second one of which was quenched and shifted to about 470 nm in the Ag-complex nanocrystals. Two couples of reversible redox waves were recorded for the Ag-complex nanocrystals; one centered at about -0.25 V (vs. Ag/AgCl) was designated to one electron transfer process of Ag - (DHQ)2AQN and Ag - (DHQ)2AQN(+), and the other one centered at about 0.2 V was designated to one electron transfer process of Ag - (DHQ)2AQN and Ag(+) - (DHQ)2AQN.
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Affiliation(s)
- Ying Tang
- Department of Chemistry, Fudan University, 220 Handan Road, Shanghai 200433, China
| | - Hui-Ting Wang
- Department of Chemistry, Fudan University, 220 Handan Road, Shanghai 200433, China
| | - Meng Chen
- Department of Chemistry, Fudan University, 220 Handan Road, Shanghai 200433, China
| | - Dong-Jin Qian
- Department of Chemistry, Fudan University, 220 Handan Road, Shanghai 200433, China
| | - Li Zhang
- Beijing National Laboratory for Molecular Science, CAS Key Laboratory of Colloid, Interface and Chemical Thermodynamics, Institute of Chemistry, Chinese Academy of Sciences, No. 2 Zhongguancun Beiyijie, Beijing 100190, China
| | - Minghua Liu
- Beijing National Laboratory for Molecular Science, CAS Key Laboratory of Colloid, Interface and Chemical Thermodynamics, Institute of Chemistry, Chinese Academy of Sciences, No. 2 Zhongguancun Beiyijie, Beijing 100190, China
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Ariga K, Yamauchi Y, Mori T, Hill JP. 25th anniversary article: what can be done with the Langmuir-Blodgett method? Recent developments and its critical role in materials science. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2013; 25:6477-512. [PMID: 24302266 DOI: 10.1002/adma.201302283] [Citation(s) in RCA: 270] [Impact Index Per Article: 24.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/20/2013] [Indexed: 05/18/2023]
Abstract
The Langmuir-Blodgett (LB) technique is known as an elegant method for fabrication of well-defined layered structures with molecular level precision. Since its discovery the LB method has made an indispensable contribution to surface science, physical chemistry, materials chemistry and nanotechnology. However, recent trends in research might suggest the decline of the LB method as alternate methods for film fabrication such as layer-by-layer (LbL) assembly have emerged. Is LB film technology obsolete? This review is presented in order to challenge this preposterous question. In this review, we summarize recent research on LB and related methods including (i) advanced design for LB films, (ii) LB film as a medium for supramolecular chemistry, (iii) LB technique for nanofabrication and (iv) LB involving advanced nanomaterials. Finally, a comparison between LB and LbL techniques is made. The latter reveals the crucial role played by LB techniques in basic surface science, current advanced material sciences and nanotechnologies.
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Affiliation(s)
- Katsuhiko Ariga
- World Premier International (WPI) Research Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS) PRESTO & CREST, JST, 1-1 Namiki, Tsukuba, 305-0044, Japan
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24
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Schwabegger G, Oehzelt M, Salzmann I, Quochi F, Saba M, Mura A, Bongiovanni G, Vollmer A, Koch N, Sitter H, Simbrunner C. Interface properties of organic para-hexaphenyl/α-sexithiophene heterostructures deposited on highly oriented pyrolytic graphite. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:14444-14450. [PMID: 24156627 PMCID: PMC3842851 DOI: 10.1021/la402242b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/13/2013] [Revised: 10/23/2013] [Indexed: 06/02/2023]
Abstract
It was recently reported, that heterostructures of para-hexaphenyl (p-6P) and α-sexithiophene (6T) deposited on muscovite mica exhibit the intriguing possibility to prepare lasing nanofibers of tunable emission wavelength. For p-6P/6T heterostructures, two different types of 6T emission have been observed, namely, the well-known red emission of bulk 6T crystals and additionally a green emission connected to the interface between p-6P and 6T. In this study, the origin of the green fluorescence is investigated by photoelectron spectroscopy (PES). As a prerequisite, it is necessary to prepare structurally similar organic crystals on a conductive surface, which leads to the choice of highly oriented pyrolytic graphite (HOPG) as a substrate. The similarity between p-6P/6T heterostructures on muscovite mica and on HOPG is evidenced by X-ray diffraction (XRD), scanning force microscopy (SFM), and optical spectroscopy. PES measurements show that the interface between p-6P and 6T crystals is sharp on a molecular level without any sign of interface dipole formation or chemical interaction between the molecules. We therefore conclude that the different emission colors of the two 6T phases are caused by different types of molecular aggregation.
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Affiliation(s)
- Günther Schwabegger
- Institute
of Semiconductor and Solid State Physics, Johannes Kepler University, Altenbergerstrasse 69, A-4040 Linz, Austria
| | - Martin Oehzelt
- Helmholtz
Zentrum Berlin für Materialien und Energie GmbH, BESSY II, D-12489 Berlin, Germany
- Institut
für Physik, Humboldt-Universität zu Berlin, D-12489 Berlin, Germany
| | - Ingo Salzmann
- Institut
für Physik, Humboldt-Universität zu Berlin, D-12489 Berlin, Germany
| | - Francesco Quochi
- Dipartimento
di Fisica, Università di Cagliari, I-09042 Monserrato
(CA), Italy
| | - Michele Saba
- Dipartimento
di Fisica, Università di Cagliari, I-09042 Monserrato
(CA), Italy
| | - Andrea Mura
- Dipartimento
di Fisica, Università di Cagliari, I-09042 Monserrato
(CA), Italy
| | - Giovanni Bongiovanni
- Dipartimento
di Fisica, Università di Cagliari, I-09042 Monserrato
(CA), Italy
- Istituto
Officina dei Materiali (CNR-IOM), Unità
di Cagliari, I-09042 Monserrato (CA), Italy
| | - Antje Vollmer
- Helmholtz
Zentrum Berlin für Materialien und Energie GmbH, BESSY II, D-12489 Berlin, Germany
| | - Norbert Koch
- Helmholtz
Zentrum Berlin für Materialien und Energie GmbH, BESSY II, D-12489 Berlin, Germany
- Institut
für Physik, Humboldt-Universität zu Berlin, D-12489 Berlin, Germany
| | - Helmut Sitter
- Institute
of Semiconductor and Solid State Physics, Johannes Kepler University, Altenbergerstrasse 69, A-4040 Linz, Austria
| | - Clemens Simbrunner
- Institute
of Semiconductor and Solid State Physics, Johannes Kepler University, Altenbergerstrasse 69, A-4040 Linz, Austria
- Dipartimento
di Fisica, Università di Cagliari, I-09042 Monserrato
(CA), Italy
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25
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Wan Y, Goubet N, Albouy PA, Schaeffer N, Pileni MP. Hierarchy in Au nanocrystal ordering in a supracrystal: II. Control of interparticle distances. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:13576-81. [PMID: 24083385 DOI: 10.1021/la403583q] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Au nanocrystals coated with thiol derivatives differing by the length of their alkyl chains are used to build 3D superlattices called supracrystals. In this study, we used two sets of Au nanocrystals differing by their sizes and size distributions. The average sizes are 5 nm (Au5) and 7 nm (Au7). From one experiment to the other, the size distribution slightly changes. For Au5 nanocrystals, it evolves from 6 to 8%, and for Au7 nanocrystals, it varies from 5 to 6%. The Au nanocrystals (Au5 and Au7) are first dispersed in toluene and produce fcc supracrystals by solvent evaporation. Here, by small-angle grazing X-ray diffraction, we observe a control in the average interparticle distance within the supracrystals. When the supracrystals are grown at zero toluene vapor pressure, the interparticle distances increase linearly with the alkyl chain length of the nanocrystals' coating agent regardless of their diameters. Furthermore, the dry supracrystals can swell and the interparticle distance within the superstructure be increased by subjecting the material to toluene vapor pressure after initial growth. This swelling process is reversible, and retraction occurs when the toluene vapor pressure drops. This indicates a strong ability of the dried supracrystals to trap toluene molecules. On increasing the toluene vapor pressure during the solvent evaporation process, the slope of the linear dependency of the interparticle distances to the alkyl chain length is markedly decreased and the interparticle distance reaches a quasi-plateau. This is explained by the influence of depletion forces created by the presence of thiol-containing molecules physisorbed on the coating molecules on the internal structure of these supracrystals. Recently, we demonstrated that, by using the same nanocrystals (Au5 and Au7), a hierarchy in the supracrystal growth process takes place from heterogeneous nucleation with the formation of a layer-by-layer film to homogeneous nucleation in solution with the formation of shaped supracrystals. Here it is shown that the interparticle distance is independent of the supracrystal growth mechanisms.
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Affiliation(s)
- Yanfen Wan
- Laboratoire des Matériaux Mésoscopiques et Nanométriques (LM2N), UMR CNRS 7070, Université Pierre et Marie Curie , bât F, BP 52, 4 place Jussieu, 75252 Paris Cedex 05, France
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26
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Rong JH, Ji LJ, Yang ZZ. Some key ordered macroporous composites. CHINESE JOURNAL OF POLYMER SCIENCE 2013. [DOI: 10.1007/s10118-013-1324-6] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Bodnarchuk MI, Erni R, Krumeich F, Kovalenko MV. Binary superlattices from colloidal nanocrystals and giant polyoxometalate clusters. NANO LETTERS 2013; 13:1699-1705. [PMID: 23488858 DOI: 10.1021/nl4002475] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
We report a new kind of long-range ordered binary superlattices comprising atomically defined inorganic clusters and colloidally synthesized nanocrystals. In a model system, we combined surfactant-encapsulated, nearly spherical giant polyoxometalate clusters containing 2.9 nm polyoxomolybdate or 2.5 nm polyoxovanadomolybdate cores with monodisperse colloidal semiconductor nanocrystals (PbS, CdSe, PbS/CdS; 4-11 nm). The results are rationalized on the basis of dense packing principles of sterically stabilized particles with predominantly hard-spherelike interparticle interactions. By varying the size-ratios and relative concentrations of constituents, we obtained known thermodynamically stable binary packings of hard-spheres such as NaCl, AlB2, and NaZn13 lattices and also CaCu5-type lattice and aperiodic quasicrystals with 12-fold symmetry. These results suggest that other kinds of cluster materials such as fullerenes and magic-sized metallic and semiconductor clusters can also be integrated into supramolecular assemblies with nanocrystals. Furthermore, synergistic effects are expected from the combination of redox and catalytic properties of polyoxometalates with excitonic and plasmonic properties of inorganic nanocrystals.
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Affiliation(s)
- Maryna I Bodnarchuk
- Institute of Inorganic Chemistry, Department of Chemistry and Applied Biosciences, ETH Zürich, CH-8006 Zürich, Switzerland.
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28
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Kang Y, Li M, Cai Y, Cargnello M, Diaz RE, Gordon TR, Wieder NL, Adzic RR, Gorte RJ, Stach EA, Murray CB. Heterogeneous catalysts need not be so "heterogeneous": monodisperse Pt nanocrystals by combining shape-controlled synthesis and purification by colloidal recrystallization. J Am Chem Soc 2013; 135:2741-7. [PMID: 23351091 DOI: 10.1021/ja3116839] [Citation(s) in RCA: 69] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Well-defined surfaces of Pt have been extensively studied for various catalytic processes. However, industrial catalysts are mostly composed of fine particles (e.g., nanocrystals), due to the desire for a high surface to volume ratio. Therefore, it is very important to explore and understand the catalytic processes both at nanoscale and on extended surfaces. In this report, a general synthetic method is described to prepare Pt nanocrystals with various morphologies. The synthesized Pt nanocrystals are further purified by exploiting the "self-cleaning" effect which results from the "colloidal recrystallization" of Pt supercrystals. The resulting high-purity nanocrystals enable the direct comparison of the reactivity of the {111} and {100} facets for important catalytic reactions. With these high-purity Pt nanocrystals, we have made several observations: Pt octahedra show higher poisoning tolerance in the electrooxidation of formic acid than Pt cubes; the oxidation of CO on Pt nanocrystals is structure insensitive when the partial pressure ratio p(O2)/p(CO) is close to or less than 0.5, while it is structure sensitive in the O(2)-rich environment; Pt octahedra have a lower activation energy than Pt cubes when catalyzing the electron transfer reaction between hexacyanoferrate (III) and thiosulfate ions. Through electrocatalysis, gas-phase-catalysis of CO oxidation, and a liquid-phase-catalysis of electron transfer reaction, we demonstrate that high quality Pt nanocrystals which have {111} and {100} facets selectively expose are ideal model materials to study catalysis at nanoscale.
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Affiliation(s)
- Yijin Kang
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
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29
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Kim JY, Chang JB, Ross CA, Stellacci F. Seeded solution growth of nanoparticles into ordered three-dimensional supracrystals. RSC Adv 2013. [DOI: 10.1039/c3ra41509k] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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30
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