Imaging of Aromatic Amide Molecules in Motion

Solin, Niclas; Koshino, Masanori; Tanaka, Terumichi; Takenaga, Shinya; Kataura, Hiromichi; Isobe, Hiroyuki; Nakamura, Eiichi

doi:10.1246/cl.2007.1208

Cited by 31 publications

(29 citation statements)

References 14 publications

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“…SMRT-TEM analysis showed that Y molecules indeed stand upright on the CNH surface, and remain flexible to undergo stochastically conformational change several times per minute (Fig. 2a,b and Supplementary Movie S1) 15 . The observed conformational change seems to be due largely to the rotation of the central biphenyl moiety.…”

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confidence: 99%

Heterogeneous nucleation of organic crystals mediated by single-molecule templates

et al. 2012

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Fundamental understanding of how crystals of organic molecules nucleate on a surface remains limited because of the difficulty of probing rare events at the molecular scale. Here we show that single-molecule templates on the surface of carbon nanohorns can nucleate the crystallization of two organic compounds from a supersaturated solution by mediating the formation of disordered and mobile molecular nanoclusters on the templates. Single-molecule real-time transmission electron microscopy indicates that each nanocluster consists of a maximum of approximately 15 molecules, that there are fewer nanoclusters than crystals in solution, and that in the absence of templates physisorption, but not crystal formation, occurs. Our findings suggest that template-induced heterogeneous nucleation mechanistically resembles two-step homogeneous nucleation.

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confidence: 99%

Heterogeneous nucleation of organic crystals mediated by single-molecule templates

et al. 2012

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“…Thei nhibited rotation is caused by interaction with the electron beam and is indicative of as et of metastable orientations.P rior work has observed similar electron beam induced molecular motion on graphene oxide, [32] on carbon nanotubes, [33,34] and for molecules attached to carbon nanohorns,where it was shown that lower acceleration voltages in the TEM resulted in higher frequency of molecular motion as aresult of alarger scattering cross-section. [35,36] An accelerat- Figure 2.…”

Section: Methodsmentioning

confidence: 79%

Covalently Binding Atomically Designed Au₉ Clusters to Chemically Modified Graphene

et al. 2015

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Atomic-resolution transmission electron microscopy was used to identify individual Au 9 clusters on as ulfurfunctionalizedg raphene surface.T he clusters were preformed in solution and covalently attached to the surface without any dispersion or aggregation. Comparison of the experimental images with simulations allowed the rotational motion, without lateral displacement, of individual clusters to be discerned, therebyd emonstrating ar obust covalent attachment of intact clusters to the graphene surface.Gold nanoparticles (AuN Ps) have structure-and sizedependent optical and electronic properties, [1][2][3][4] and their catalytic activity increases when the particle size drops down to around 1nm.[5] To achieve this size,a na ccurate design of ligand-protected gold nanoclusters (AuN Cs) is required. A family of phosphine-coordinatedA uN Cs ([Au n L m ] z+ ; n = 1-11, z = 1-4;L= PPh 3 or PPh 2 (CH 2 ) 3 PPh 2 )having well-defined nuclearity and geometrical structures have been synthesized [6,7] and shown to exhibit clearly distinguishable optical and electronic properties. [7][8][9][10] However,the immobilization of Au NCs onto as upport is an important step towards their implementation in practical devices,which has so far not been realized satisfactorily. [1,2,11,12] Therefore,t he challenge is to develop as trategy to chemically bind predesigned Au NCs onto the surface of solid conductors/semiconductors,t hus allowing direct correlation between property and structural features.Graphene (G), as at wo-dimensional system with outstanding electronic properties and ah igh surface area, [13] offers the ideal platform for the deposition of NPs. [14] In addition, the diversity of carbon chemistry offers many routes to producing chemically modified graphene (CMG). [13,15,16] Nanoparticles have been stably attached to both Gand CMGs for ap lethora of different applications.[17] In particular, different routes for the hybridization of Au NPs with G have been studied, [18][19][20][21][22][23] but surprisingly,t he fabrication of atomically precise Au NCs supported on Gr emains unexplored. Recently,w eh ave described an easy way to chemically modify graphene with sulfur functionalities, [24] and now,b yt aking advantage of the affinity between gold and sulfur, we describe the stable attachment of preformed [Au 9 (PPh 3 ) 8 ](NO 3 )c lusters [25] to our CMG.A berration-corrected transmission electron microscopy (ac-TEM) has been employed to directly identify individual covalently attached Au 9 clusters,a nd to track their relative orientation.Chemically modified graphene with sulfur functionalities was synthesized by treatment of graphene oxide (GO) with potassium thioacetate,f ollowed by an aqueous work-up. [24] This route is simple and scalable,a nd gives as ingle-layer material with reactive thiol groups that offer anchoring points for further functionalization;t his material is referred to as GOSH. Moreover,t he synthetic route results in ap artial reduction of the GO when the sulfur functionalities are introdu...

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“…[1][2][3] Recent advances have led to the extensive use of aberration corrected transmission electron microscopes (ac-TEMs), which permit atomic resolution at low electron accelerating voltages and have made great advances in structural elucidation of carbon based nanomaterials as well as allowing the examination of the dynamics of molecules. [4][5][6][7][8][9] A key aspect for the rapid development of ac-TEM has been the emergence of electron transparent carbon-based supports that are compatible with the lowering of the accelerating voltage to ≤ 80 kV. Thus, carbon nanotubes and fullerenes have been widely used as molecular cages to isolate and image a wide variety of molecular scale nanostructures.…”

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“…6-cluster possess a C 2v symmetry with a C 2 rotation axis and two mirror planes (σ v and σ v ') ( Figure 1). 25 The presence of the cobalt atom, furthermore, provides the cluster with a reference atom from which to establish cluster orientation during TEM analysis, hence it offers a clear advantage with respect the O h -[W 6 O 19 ] 2-Keggin ions or the non-substituted C 2v [SiW 10 O 36 ] 8-lacunary Keggin counterpart previously imaged over carbon nanotubes or supported GO as these ions contained only one type of heavy atom (i.e. W).…”

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confidence: 99%

Selective Imaging of Discrete Polyoxometalate Ions on Graphene Oxide under Variable Voltage Conditions

Bosch‐Navarro¹,

Perkins

Kashtiban³

et al. 2016

ACS Nano

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Monosubstituted lacunary Keggin [CoSiW11O39](6-) ions on graphene oxide (GO) were used in a comparative imaging study using aberration corrected transmission electron microscopy at two different acceleration voltages, 80 and 200 kV. By performing a set of static and dynamical studies, together with image simulations, we show how the use of lower voltages results in better stability and resolution of the underlying GO support while the use of higher voltages permits better resolution of the individual tungsten atoms and leads to less kinetic motion of the cluster, thus leading to a more accurate identification of cluster orientation and better stability under dynamical imaging conditions. Applying different voltages also influences the visibility of both GO and the lighter Co at lower or higher voltages, respectively.

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Imaging of Aromatic Amide Molecules in Motion

Cited by 31 publications

References 14 publications

Heterogeneous nucleation of organic crystals mediated by single-molecule templates

Heterogeneous nucleation of organic crystals mediated by single-molecule templates

Covalently Binding Atomically Designed Au₉ Clusters to Chemically Modified Graphene

Selective Imaging of Discrete Polyoxometalate Ions on Graphene Oxide under Variable Voltage Conditions

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Imaging of Aromatic Amide Molecules in Motion

Cited by 31 publications

References 14 publications

Heterogeneous nucleation of organic crystals mediated by single-molecule templates

Heterogeneous nucleation of organic crystals mediated by single-molecule templates

Covalently Binding Atomically Designed Au9 Clusters to Chemically Modified Graphene

Selective Imaging of Discrete Polyoxometalate Ions on Graphene Oxide under Variable Voltage Conditions

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Covalently Binding Atomically Designed Au₉ Clusters to Chemically Modified Graphene