Formation and stability of dense arrays of Au nanoclusters on hexagonal boron nitride/Rh(111)

Patterson, Matthew C.; Habenicht, Bradley F.; Kurtz, Richard L.; Liu, Li; Xu, Ye; Sprunger, P. T.

doi:10.1103/physrevb.89.205423

Cited by 35 publications

(70 citation statements)

References 52 publications

(75 reference statements)

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“…At Θ Au = 0.045 MLE the Au 4f 7/2 peak was found at ~ 83.7 eV, while the bulk value is 84.0 eV. The rather low binding energy observed at small coverages is attributed to the presence of negative extra charge on Au clusters due to an electron transfer from h-BN (and Rh(111)) to Au nanoparticles, in accordance with previous DFT studies [30][31][32]. At higher coverages the peak position gradually approaches the bulk value, because the amount of extra charge per Au atom decreases, and the electronic structure of larger Au clusters is bulk-like.…”

Section: Adsorption Of Acetaldehyde On Gold Nanoparticles Prepared Onsupporting

confidence: 89%

“…BN grows in a nanomesh form because of the stronger interfacial chemical bonding as a consequence of better orbital overlapping. The growth of Au and the surface properties of the formed gold nanoparticles were investigated by different surface science tools [28][29][30][31][32][33][34]. Scanning tunneling microscopy (STM) and low energy ion scattering (LEIS) measurements confirmed that at small coverages up to Θ Au = 0.1-0.2 ML, nearly two dimensional clusters form, while a clearly 3D growth was found at higher gold doses.…”

Section: Introductionmentioning

confidence: 99%

“…X-ray photoelectron spectroscopy (XPS) analysis of core-level electronic states in the deposited Au shows strong finalstate effects induced by restricted size dominating for low coverage [32,35]. DFT calculation supports that all Au atoms in these one monolayer high clusters are negatively charged [31]. At higher coverages, the Au nanoparticles are less negatively charged; in particularly, topmost layer gold atoms are almost neutral [32].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Gold on the Adsorption Properties of Acetaldehyde on Clean and h-BN Covered Rh(111) Surface

et al. 2018

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Auger electron spectroscopy, high-resolution electron energy loss spectroscopy and temperature programmed desorption methods have been used in order to investigate the adsorption properties and reactions of acetaldehyde on gold decorated rhodium and BN/Rh(111) surfaces. Scanning tunneling microscopy and X-ray photoelectron spectroscopy measurements were carried out to characterize the gold nanoparticles on clean and hexagonal boron nitride (h-BN) covered Rh(111). The adsorption of acetaldehyde was not completely hindered by gold atoms; however, depending on the structure of the outermost bimetallic layer (surface alloy) the dissociation of the parent molecule was suppressed, namely the production of carbon monoxide was inhibited by the gold domains. Our measurements with acetaldehyde on Au/h-BN/Rh(111) confirmed the observation that the lack of suitable adsorption sites eliminates the formation of CO. Nevertheless, increased coverage of gold enhanced the amount of adsorbed aldehyde at low temperature. We may predict that the low reactivity of acetaldehyde on Au/h-BN/Rh(111) significantly determine the ethanol decomposition mechanism on this surface.

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Section: Adsorption Of Acetaldehyde On Gold Nanoparticles Prepared Onsupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of Gold on the Adsorption Properties of Acetaldehyde on Clean and h-BN Covered Rh(111) Surface

et al. 2018

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“…The graphene structure is a good candidate for size selective metal deposition [69][70][71]. Very small Au clusters can also be prepared on hexagonal boron nitride [72,73]. It was demonstrated that for these small clusters (Au n , (n = 2-4) on h-BN/Rh(111) nanomesh) a linear geometry is the most stable.…”

Section: Discussionmentioning

confidence: 99%

Beyond Nanoparticles: The Role of Sub-nanosized Metal Species in Heterogeneous Catalysis

Kiss

Kukovecz

2019

Catal Lett

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Titanate nanostructures are of great interest for catalytic applications because their high surface area and cation exchange capacity create the possibility to achieve high metal dispersion. Ion exchange allows titanate nanostructures to incorporate metal adatoms in their framework. Consequently, the curved layers contain a large amount of defect sites, typically oxygen vacancies and Ti 3+ centers, which can make them promising photocatalysts, because the defect sites can trap photoelectrons or holes extending the lifetime of the excited state. Due to the large amount of defects, titanate nanotubes (TNT) can stabilize sub-nanosized gold clusters, presumably in Au 25 form. This perspective summarizes the previous results obtained in the photocatalytic transformation of methane in which the size of gold nanoclusters plays an important role. Photocatalytic measurements revealed that methane is active towards photo-oxidation. Methane transforms mainly into hydrogen and, to a lesser extent, to ethane and ethanol. Based on recent additional results, we stress here that gold clusters (Au 25) may be directly involved in the photo-induced reactions, namely in the direct activation of the methane/Au 25 δ+ complex during irradiation. Another new finding is that gold nanoparticles supported on TNT exhibit high catalytic activity in CO 2 hydrogenation. Our results revealed fundamental differences in the reaction schemes as the products of the two routes are CO (thermal process) and CH 4 (photocatalytic route), indicating the importance of photogenerated electron-hole pairs in the reaction. The presence of gold nanoparticles on the surface has been found to have multiple roles. On the one hand, gold in nano and sub-nano sizes promotes the adsorption and scission of reactants, important for both types of reactions. On the other hand, the gold-support interface forms a rectifying Schottky contact that helps in the separation of photogenerated carriers, thus improving the utilization of electrons and holes in the reduction and oxidation steps, respectively. Furthermore, gold ions (Au +), in the cationic sites of the titanate lattice promote the photocatalytic transformation of formate (which is one of the intermediates), thus advancing the reaction further towards the fully reduced product. The explored reaction schemes may pave the road towards novel catalytic materials that can solve challenges associated with the activation of CH 4 and CO 2 and thus contribute to green chemistry.

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“…Design and fabrication of nanoclusters is a new inspiring field because of their amazing features that are remarkably different from classical materials [1][2][3][4]. The beneficial electronic, optical, magnetic, and chemical properties of nanoclusters can be employed in many fields, such as optoelectronic devices [5,6], single-electronic devices [7], ultrahigh-density magnetic recording [8][9][10], and quantum computing.…”

Section: Introductionmentioning

confidence: 99%

Novel Evolution Process of Zn-Induced Nanoclusters on Si(111)-(7×7) Surface

Zhou

Chen

et al. 2015

Nano-Micro Lett.

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A tiny number of Zn atoms were deposited on Si (111)- (797) surface to study the evolution process of Zninduced nanoclusters. After the deposition, three types (type I, II, and III) of Zn-induced nanoclusters were observed to occupy preferably in the faulted half-unit cells. These Zn-induced nanoclusters are found to be related to one, two, and three displaced Si edge adatoms, and simultaneously cause the depression of one, two, and three closest Si edge adatoms in the neighboring unfaulted half-unit cells at negative voltages, respectively. First-principles adsorption energy calculations show that the observed type I, II, and III nanoclusters can reasonably be assigned as the Zn 3 Si 1 , Zn 5 Si 2 , and Zn 7 Si 3 clusters, respectively. And Zn 3 Si 1 , Zn 5 Si 2 , and Zn 7 Si 3 clusters are, respectively, the most stable structures in cases of one, two, and three displaced Si edge adatoms. Based on the above energy-preferred models, the simulated bias-dependent STM images are all well consistent with the experimental observations. Therefore, the most stable Zn 7 Si 3 nanoclusters adsorbed on the Si(111)-(797) surface should grow up on the base of Zn 3 Si 1 and Zn 5 Si 2 clusters. A novel evolution process from Zn 3 Si 1 to Zn 5 Si 2 , and finally to Zn 7 Si 3 nanocluster is unveiled.

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Formation and stability of dense arrays of Au nanoclusters on hexagonal boron nitride/Rh(111)

Cited by 35 publications

References 52 publications

Effect of Gold on the Adsorption Properties of Acetaldehyde on Clean and h-BN Covered Rh(111) Surface

Effect of Gold on the Adsorption Properties of Acetaldehyde on Clean and h-BN Covered Rh(111) Surface

Beyond Nanoparticles: The Role of Sub-nanosized Metal Species in Heterogeneous Catalysis

Novel Evolution Process of Zn-Induced Nanoclusters on Si(111)-(7×7) Surface

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