Self-assembled materials for catalysis

Zhu, Kake; Wang, Donghai; Li, Jun

doi:10.1007/s12274-009-9002-2

Cited by 62 publications

(31 citation statements)

References 190 publications

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“…[1][2][3][4][5] A major reason for this attention is the prospect of controlling atomic scale structures on surfaces, which can lead to mass fabrication of usable systems and novel devices. A promising approach toward the control of self-assembly is the use of preformed surface templates onto which particular nanostructures can be arranged in a wellordered fashion.…”

Section: Introductionmentioning

confidence: 99%

Self-assembly of Fe nanocluster arrays on templated surfaces

Lübben

Krasnikov

Preobrajenski

et al. 2012

Journal of Applied Physics

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The growth of Fe nanoclusters on the Ge(001) and MoO 2 /Mo(110) surfaces has been studied using low-temperature scanning tunneling microscopy (STM) and X-ray magnetic circular dichroism (XMCD). STM results indicate that at low coverage Fe atoms self-assemble on both surfaces into well-separated nanoclusters, which nucleate at equivalent surface sites. Their size, shape, and the observed spatial separation are dictated by the substrate and depend on preparation conditions. Annealing the Fe nanoclusters on Ge(001) at 420 K leads to the formation of linear nanocluster arrays, which follow the Ge dimer rows of the substrate, due to cluster mobility at such temperature. In turn, linear Fe nanocluster arrays are formed on the MoO 2 /Mo(110) surface at room temperature at a surface coverage greater than 0.5 monolayer. This is due to the more pronounced row pattern of the MoO 2 /Mo(110) surface compared to Ge(001). These nanocluster arrays follow the direction of the oxide rows of the strained MoO 2 /Mo(110) surface. The Fe nanoclusters formed on both surfaces show a superparamagnetic behavior as measured by XMCD.

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Section: Introductionmentioning

confidence: 99%

Self-assembly of Fe nanocluster arrays on templated surfaces

Lübben

Krasnikov

Preobrajenski

et al. 2012

Journal of Applied Physics

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“…The Ge(001)-(2×1) surface reconstruction is obtained through the pairing of nearestneighbour surface atoms, forming dimer rows oriented along the [1][2][3][4][5][6][7][8][9][10][11] crystallographic direction [32]. The c(4×2) reconstruction is observed on the Ge(001) surface at temperatures below 200 K [33].…”

Section: Resultsmentioning

confidence: 99%

“…1). It exhibits large terraces with the Ge dimers forming zig-zag rows oriented along the [1][2][3][4][5][6][7][8][9][10] direction, in agreement with previous studies [10,37] If the sample is left at room temperature under UHV conditions for more than one hour after Fe deposition, larger clusters are observed on the Ge(001) surface, similar to results obtained by Jordan et al [13]. Typical low temperature STM images of 0.2 ML of Fe on the Ge(001) surface are shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Fe nanoclusters on the Ge(001) surface studied by scanning tunneling microscopy, density functional theory calculations and X-ray magnetic circular dichroism

et al. 2011

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The growth of Fe nanoclusters on the Ge(001) surface has been studied using lowtemperature scanning tunnelling microscopy (STM) and density functional theory (DFT) calculations. STM results indicate that Fe nucleates on the Ge(001) surface, forming wellordered nanoclusters of uniform size. Depending on the preparation conditions, two types of nanoclusters were observed having either four or sixteen Fe atoms within a nanocluster. The results were confirmed by DFT calculations. Annealing the nanoclusters at 420 K leads to the formation of nanorow structures, due to cluster mobility at such temperature. The Fe nanoclusters and nanorow structures formed on the Ge(001) surface show a superparamagnetic behaviour as measured by X-ray magnetic circular dichroism. IntroductionThe self-assembly of atoms or molecules into ordered surface-supported nanostructures is one of the key topics in solid state physics and surface science [1-9]. One major reason for this attention is the prospect of controlling atomic scale structures on surfaces, which can lead to mass fabrication of usable systems and novel devices. A promising approach towards the control of self-assembly is the use of preformed surface templates onto which particular nanostructures can be arranged in a well-ordered fashion [10][11][12]. Semiconductor surfaces such as the Ge(001)-(2×1) reconstructed surface are suitable templates for the growth of wellordered, uniformly-sized metal nanoclusters [13,14]. Their size, shape, and the spacing between clusters are dictated by the substrate. Such metal-nanocluster -semiconductor systems can be considered to be examples of low-dimensional dilute magnetic semiconductors (DMS), as the interaction between transition metal clusters takes place via the semiconducting substrate [15]. Furthermore, the layout of clusters on the surface into a regular exposed system allows for good control of the separation between clusters, which cannot be achieved in most DMS three-dimensional systems.DMS are promising materials for use in many technological applications and their study is important for future developments in nanotechnology as well as from the fundamental point of view. Such systems have attracted much attention recently since they can be utilized as essential building blocks in the field of spin-dependent electronic (spintronic) devices, providing a link between magnetism and semiconductor technologies [16][17][18][19]. The incorporation of ferromagnetic elements into semiconductor devices may lead

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“…This in turn allows for the development of novel system properties and advanced functionality in plasmonics, optics, catalysis, biosensing, power generation and energy storage, among many other related fields. [1][2][3][4][5] In particular, the conjugation of biomolecules (proteins, enzymes, deoxyribonucleic acid (DNA), and lipids) as well as living cells to both flat and structured gold has been extensively documented. [6][7][8][9][10][11][12][13][14][15][16] Traditionally, biomolecule coupling to gold (or other substrates) is often facilitated by a cross-linking agent and rarely directly to the gold surface itself.…”

Section: Introductionmentioning

confidence: 99%

Functional and Selective Bacterial Interfaces Using Cross-Scaffold Gold Binding Peptides

Adams

Hurley

Jahnke

et al. 2015

JOM

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We investigated the functional and selective activity of three phage-derived gold-binding peptides on the Escherichia coli (E. coli) bacterial cell surface display scaffold (eCPX) for the first time. Gold-binding peptides, p3-Au12 (LKAHLPPSRLPS), p8#9 (VSGSSPDS), and Midas-2 (TGTSVLIATPYV), were compared side-by-side through experiment and simulation. All exhibited strong binding to an evaporated gold film, with approximately a 4-log difference in binding between each peptide and the control sample. The increased affinity for gold was also confirmed by direct visualization of samples using Scanning Electron Microscopy (SEM). Peptide dynamics in solution were performed to analyze innate structure, and all three were found to have a high degree of flexibility. Preferential binding to gold over silicon for all three peptides was demonstrated, with up to four orders of magnitude selectivity exhibited by p3-Au12. The selectivity was also clearly evident through SEM analysis of the boundary between the gold film and silicon substrate. Functional activity of bound E. coli cells was further demonstrated by stimulating filamentation and all three peptides were characterized as prolific relative to control samples. This work shows great promise towards functional and active bacterial-hybrid gold surfaces and the potential to enable the next generation living material interfaces.

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Self-assembled materials for catalysis

Cited by 62 publications

References 190 publications

Self-assembly of Fe nanocluster arrays on templated surfaces

Self-assembly of Fe nanocluster arrays on templated surfaces

Fe nanoclusters on the Ge(001) surface studied by scanning tunneling microscopy, density functional theory calculations and X-ray magnetic circular dichroism

Functional and Selective Bacterial Interfaces Using Cross-Scaffold Gold Binding Peptides

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