Study of Ag induced bimetallic (Au–Ag) nanowires on silicon (5 5 12) surfaces: Experiment and theoretical aspects

Bhukta, Anjan; Bagarti, Trilochan; Guha, Puspendu; Ravulapalli, Sathyavathi; Satpati, Biswarup; Rakshit, Bipul; Maiti, Paramita; Parlapalli, Venkata Satyam

doi:10.1016/j.susc.2017.05.012

Cited by 7 publications

(3 citation statements)

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“…To get appropriate results within the KMC methodology, one has to determine all possible events adatoms can participate in and the corresponding binding energies that can be estimated using first-principles methods. [35][36][37][38][39][40] Following previous studies on the adsorption and aggregation of metal adatoms on the silicon reconstructed surface, one can discern the formation of chain-like structures perpendicular to the silicon dimer rows and islands of adsorbate on the surface with distinctive contribution from C-defects that might act as nucleation centers. [12][13][14][15][16][17][18][19]22,23,[41][42][43][44][45][46] To give a quantitative estimate, we herein explore the idea of using a thin alloying layer that provides a natural playground to modify the electronic properties of the parent material.…”

Section: Introductionmentioning

confidence: 99%

“…[47][48][49][50][51][52][53][54][55][56][57] Recently, it has been shown that bimetal-silicon systems offer significant possibilities for the self-assembled growth of heterogeneous structures. 36,[58][59][60][61][62][63][64][65][66] In particular, experimental studies of the Si(001) surface morphology with simultaneously deposited Ag and In atoms demonstrate the formation of unusual two-dimensional trellis-like self-organized structures affected by surface defects. 67 In this study, we report on the effect of Ag-In co-deposition on a silicon surface using firstprinciples-assisted KMC simulations, where the growth process and related structural changes are included by respective energy barriers as determined from the density functional theory (DFT) calculations.…”

Section: Introductionmentioning

confidence: 99%

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An ab initio approach to anisotropic alloying into the Si(001) surface

Prodan

Paradezhenko

Yudin

et al. 2023

Phys. Chem. Chem. Phys.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An ab initio approach to anisotropic alloying into the Si(001) surface

Prodan

Paradezhenko

Yudin

et al. 2023

Phys. Chem. Chem. Phys.

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“…Recently, a facial approach for preparation of Au/Ag bimetallic nanowires on silicon surface is presented by Parlapalli and co-workers. [180] They find that the amount of Ag used to modify the silicon surface play a vital role in the final morphology of Au/Ag…”

Section: Gold and Silvermentioning

confidence: 99%

Ligand-controlled preparation and fundamental understanding of anisotropic gold nanostructures

Xia¹

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In these decades, Au nanostructures have been demonstrated to be promising nanomaterials in catalysis, detection and biomedicine. The merit of these applications manly arises from the expression of properties with strong correlations to their shape and size. Thus, well control of Au nanostructures in shape and size is important in improving their properties and applications. To synthesize morphology-controlled Au nanostructures, well understanding of their growth mechanism is crucial. Therefore, the main objective of this thesis is to prepare anisotropic Au nanostructures and understand their growth mechanism behind.Colloidal growth of Au nanostructures has been exploring for decades via chemical reduction of AuCl4 -. The intermediate process is very difficult to investigate during the fast reduction of Au 3+ to Au 0 , and thus it is of importance to explore the slow reduction for study of intermediate process with a series of weak reducing agents possessing typical aldehyde groups (i.e., HCOH, HCOOH, HCONH2, HCOCH3 and HCON(CH3)2). The binding energies of Au n+ (n = 3, 1 and 0) to ligands are simulated to exhibit binding different affinities to starting, intermediate and final Au species. In an optimized slow reaction in which ligands show stronger binding affinities to Au + than Au 3+ and Au 0 , intermediate process that the formation and disproportionation of Au + is demonstrated.For example, formic acid has much stronger binding affinity to Au + than Au 3+ so that intermediate Au + is able to be captured during the slow reduction of Au 3+ .Upon the disproportionation of Au + to Au 0 and Au 3+ , the binding affinity of ligands to different Au facets and Au 0 is crucial in controlling growth of anisotropic Au nanostructures. The adsorption of various ligands causes substantially decreased surface energies on different Au planes. There are much higher energies on {110} planes compared to the other two {111} and {100} planes with certain ratios in these energies, leading to morphological growth of Au nanoplates by various organic ligands.Meanwhile, ligands with stronger binding energies to Au 0 have stronger effect in controlling the anisotropic growth of Au nanostructures.

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