Cooperative Assembly of Magic Number<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi mathvariant="bold">C</mml:mi><mml:mn>60</mml:mn></mml:msub></mml:math>-Au Complexes

Xie, Yangchun; Tang, Lin; Guo, Quanmin

doi:10.1103/physrevlett.111.186101

Cited by 27 publications

(75 citation statements)

References 39 publications

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“…The origin of such molecules is not yet clear, but one proposal was that the superbright molecules are pushed up by Ag adatoms [41]. Given the high mobility of Au surface atoms, and the propensity of C 60 molecules to climb onto Au(111) islands [24], it seems plausible that such a mechanism could occur on Au(111), but we have not observed any such molecules in the equilibrium monolayer, nor have any been reported.…”

Section: Discussionmentioning

confidence: 76%

Structure and dynamics of C60 molecules on Au(111)

et al. 2014

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Earlier studies of C 60 adsorption on Au(111) reported many interesting and complex features. We have performed coordinated low-energy electron diffraction, scanning tunneling microscopy (STM), and density functional theory studies to elucidate some of the details of the monolayer commensurate (2Ý3 × 2Ý3)R30°p hase. We have identified the adsorption geometries of the two states that image as dim and bright in STM. These consist of a C 60 molecule with a hexagon side down in a vacancy (hex-vac) and a C 60 molecule with a carbon-carbon 6:6 bond down on a top site (6:6-top), respectively. We have studied the detailed geometries of these states and find that there is little distortion of the C 60 molecules, but there is a rearrangement of the substrate near the C 60 molecules. The two types of molecules differ in height, by about 0.7Å, which accounts for most of the difference in their contrast in the STM images. The monolayer displays dynamical behavior, in which the molecules flip from bright to dim, and vice versa. We interpret this flipping as the result of the diffusion of vacancies in the surface layers of the substrate. Our measurements of the dynamics of this flipping from one state to the other indicate that the activation energy is 0.66 ± 0.03 eV for flips that involve nearest-neighbor C 60 molecules, and 0.93 ± 0.03 for more distant flips. Based on calculated activation energies for vacancies diffusing in Au, we interpret these to be a result of surface vacancy diffusion and bulk vacancy diffusion. These results are compared to the similar system of Ag(111)-(2Ý3 × 2Ý3)R30°-C 60 . In both systems, the formation of the commensurate C 60 monolayer produces a large number of vacancies in the top substrate layer that are highly mobile, effectively melting the interfacial metal layer at temperatures well below their normal melting temperatures.

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Section: Discussionmentioning

confidence: 76%

Structure and dynamics of C60 molecules on Au(111)

et al. 2014

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“…Among the different systems under scrutiny, unusual and complex features have been reported for fullerene adsorption on Au(111) and Ag(111) surfaces [12][13][14][15][16][17][18][19][20]. Recently, Xie et al have reported the formation of magic number C 60 -Au complexes stabilized by a globalized metal-organic coordination mechanism [21]. It is thought that such process could inspire further studies aiming to design arrays of magnetic quantum dot for spin applications.…”

Section: Introductionmentioning

confidence: 99%

C60superstructure and carbide formation on the Al-terminatedAl9Co2(001)surface

et al. 2015

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We report the formation of an ordered C 60 monolayer on the Al 9 Co 2 (001) surface using scanning tunneling microscopy (STM), low-energy electron diffraction (LEED), x-ray and ultraviolet photoelectron spectroscopy (XPS/UPS), and ab initio calculations. Dosing fullerenes at 300 K results in a disordered overlayer. However, the adsorption of C 60 with the sample held between 573-673 K leads to a [4, −2|1,3] phase. The growth of C 60 proceeds with the formation of two domains which are mirror symmetric with respect to the [100] direction. Within each domain, the superstructure unit cell contains six molecules and this implies an area per fullerene equal to 91Å 2. The molecules exhibit two types of contrast (bright and dim) which are bias dependent. The adsorption energies and preferred molecular configuration at several possible adsorption sites have been determined theoretically. These calculations lead to a possible scheme describing the configuration of each C 60 in the observed superstructure. Several defects (vacancies, protrusions,. . .) and domain boundaries observed in the film are also discussed. If the sample temperature is higher than 693 K when dosing, impinging C 60 molecules dissociate at the surface, hence leading to the formation of a carbide film as observed by STM and LEED measurements. The formation of Al 4 C 3 domains and the molecular dissociation are confirmed by XPS/UPS measurements acquired at different stages of the experiment. The cluster substructure present at the Al 9 Co 2 (001) surface dictates the carbide domain orientations.

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“…The magic number (C 60 ) m −Au n clusters were discovered recently 21 when C 60 molecules and Au atoms are allowed to interact on a Au(111) substrate. These clusters have a Au core in the shape of a regular two-dimensional Au island and a shell of C 60 molecules with only certain combinations of m and n allowed.…”

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confidence: 99%

Tip-triggered Thermal Cascade Manipulation of Magic Number Gold–Fullerene Clusters in the Scanning Tunnelling Microscope

et al. 2017

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We demonstrate cascade manipulation between magic number gold-fullerene hybrid clusters by channelling thermal energy into a specific reaction pathway with a trigger from the tip of a scanning tunnelling microscope (STM). The (C)-Au clusters, formed via self-assembly on the Au(111) surface, consist of n Au atoms and m C molecules; the three smallest stable clusters are (C)-Au, (C)-Au, and (C)-Au. The manipulation cascade was initiated by driving the STM tip into the cluster followed by tip retraction. Temporary, partial fragmentation of the cluster was followed by reorganization. Self-selection of the correct numbers of Au atoms and C molecules led to the formation of the next magic number cluster. This cascade manipulation is efficient and facile with an extremely high selectivity. It offers a way to perform on-surface tailoring of atomic and molecular clusters by harnessing thermal energy, which is known as the principal enemy of the quest to achieve ultimate structural control with the STM.

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Cooperative Assembly of Magic NumberC60-Au Complexes

Cited by 27 publications

References 39 publications

Structure and dynamics of C60 molecules on Au(111)

Structure and dynamics of C60 molecules on Au(111)

C60superstructure and carbide formation on the Al-terminatedAl9Co2(001)surface

Tip-triggered Thermal Cascade Manipulation of Magic Number Gold–Fullerene Clusters in the Scanning Tunnelling Microscope

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