Electrochemically Controlled Growth of AuPt Alloy Nanowires and Nanodendrites

Yi, Xiaojun; Yu, Gang; Chang, Fangfang; Xie, Zhihui; Tran, Tan Nhat; Hu, Bo; Zhong, Chuan‐Jian

doi:10.1002/asia.201402442

Cited by 5 publications

(5 citation statements)

References 56 publications

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“…Furthermore, Au has an electronegativity higher than that of Pt which could increase the charge transfer from Pt atoms to Au atoms. To address how these structural characteristics correlate with the catalytic properties, 1D NWs of PtAu provide an ideal platform for investigation, considering that 0D PtAu nanoparticles have been extensively studied, including our own work, ,− and there are also reports on 1D PtAu NWs in terms of synthesis, − morphologies, , and properties. − While there are reports on Au/Pt and Au/Pt 3 Ni nanostructures derived by growing Pt and Pt 3 Ni alloy nanodendrites on Au nanowires and their ORR activity and durability, little has been reported on the 1D PtAu NWs in terms of the correlation between the composition- and facet-tuned structures and the electrocatalytic properties. Herein we report the first example of PtAu nanowires featuring an ultrathin Boerdijk–Coxeter helix type of structure with (111) facet-dominant surfaces, and the correlation between such NW structure/composition and the electrocatalytic activity and stability properties.…”

Section: Introductionmentioning

confidence: 99%

Composition Tunability and (111)-Dominant Facets of Ultrathin Platinum–Gold Alloy Nanowires toward Enhanced Electrocatalysis

Chang

Shan

Petkov³

et al. 2016

J. Am. Chem. Soc.

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137

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The ability for tuning not only the composition but also the type of surface facets of alloyed nanomaterials is important for the design of catalysts with enhanced activity and stability through optimizing both ensemble and ligand effects. Herein we report the first example of ultrathin platinum-gold alloy nanowires (PtAu NWs) featuring composition-tunable and (111) facet-dominant surface characteristics, and the electrocatalytic enhancement for the oxygen reduction reaction (ORR). PtAu NWs of different bimetallic compositions synthesized by a single-phase and surfactant-free method are shown to display an alloyed, parallel-bundled structure in which the individual nanowires exhibit Boerdijk-Coxeter helix type morphology predominant in (111) facets. Results have revealed intriguing catalytic correlation with the binary composition, exhibiting an activity maximum at a Pt:Au ratio of ∼3:1. As revealed by high-energy synchrotron X-ray diffraction and atomic pair distribution function analysis, NWs of this ratio exhibit a clear shrinkage in interatomic bonding distances. In comparison with PtAu nanoparticles of a similar composition and degree of shrinking of atomic-pair distances, the PtAu NWs display a remarkably higher electrocatalytic activity and stability. The outperformance of NWs over nanoparticles is attributed to the predominant (111)-type facets on the surface balancing the contribution of ensemble and ligand effects, in addition to the composition synergy due to optimal adsorption energies for molecular and atomic oxygen species on the surface as supported by DFT computation of models of the catalysts. The findings open up a new pathway to the design and engineering of alloy nanocatalysts with enhanced activity and durability.

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Section: Introductionmentioning

confidence: 99%

Composition Tunability and (111)-Dominant Facets of Ultrathin Platinum–Gold Alloy Nanowires toward Enhanced Electrocatalysis

Chang

Shan

Petkov³

et al. 2016

J. Am. Chem. Soc.

Self Cite

137

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“…Thus, two effective models were proposed for successful nanowire interconnection: a model with triangulare-end shaped growth electrodes (with less resistance) [34], and a model with a spherical and cylindersymmetrical shape of the growth electrodes [44]. The electrode gap in the studies varied between 2-10 µm [44,48] and 60 µm [47,30]. This distance could be explained by the preparation technique for the growth electrodes.…”

Section: Resultsmentioning

confidence: 99%

“…[28,34,35] is based on inducing directional electrochemical deposition in simple metal salt solutions to produce metallic wires and like the dielectrophoretic assembly [44] enables the single-step growth and interconnection of the wires which vary in their conductance by ±10% [45] with the targeted points in the external circuitry. The AC electrodeposition methods dielectrophoresis and DENA have become available for a number of materials, such as gold [28,31,34], indium [29], platinum [33,44], palladium [32,46], and Au-Pt [30,47], Au-Ag [48], Au-Pd [49] alloys. Ozturk et al [35] proposed dendritic solidification, a diffusion-limited process, as important mechanism in the DENA growth process [50].…”

Section: Hl-1 Cell Culturementioning

confidence: 99%

“…In this work we explore directed electrochemical nanowire assembly (DENA) [28][29][30][31][32][33][34][35][36] for a novel class of electrochemical sensors defined by the above-mentioned requirements for the electrochemical analysis of solutions. The approach is based on the synergic effect, where the transducer function of metallic nanowires is combined with their electrochemical catalytic activity for a particular analyte.…”

Section: Introductionmentioning

confidence: 99%

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Bimetallic nanowire sensors for extracellular electrochemical hydrogen peroxide detection in HL-1 cell culture

Nikolaev

Maybeck

Neumann

et al. 2017

J Solid State Electrochem

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The present study of nanoelectrochemical sensors prepared by directed electrochemical nanowire assembly (DENA) is defined by the requirements of electrochemical analysis, where the transducer function of metallic nanowires is synergetically combined with their electrochemical catalytic activity with respect to a particular analyte. We show for the first time that this technique can be employed for metals (Pd, Au) and their bimetallic compositions to create various multicomponent sensor nanomaterials on a single chip without the use of multistep lithography for the spatially resolved analysis of solutions. The nanostructures of various compositions can be individually addressed when used in liquid media, so that the particular surface properties of the individual nanoarray elements can be used for the electrochemical analysis of specific analytes. The sensor application of these devices in electrolytes and cell culture conditions has been demonstrated for the first time. As an example, the Pd-Au nanowires prepared by DENA were used for a non-enzymatic analysis of H2O2 with a linear concentration interval of 10-6-10-3 M, sensitivity of 18 µA M-1 and detection limit of 3×10-7 M at as low absolute value of the detection potential as-0.05 V. This sensor was also proven for the detection of hydrogen peroxide in HL-1 cell culture, demonstrating good biocompatibility and support for the cell culture conditions. Using various DENA-grown electrochemical compositions on a single chip, a novel multisensor platform is proposed for the determination of various analytes in electrolyte solutions for biocompatible sensor arrays, flexible multianalyte environmental and technological process monitoring, and healthcare areas.

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“…Recently, a method of the directed electrochemical nanowire assembly (DENA) was proposed for metal nanowires (Cheng et al, 2005 , 2011 ; Talukdar et al, 2006 ; Ozturk et al, 2007a , b ; Kawasaki and Arnold, 2011 ; Flanders et al, 2012 ; Ji et al, 2013 ; Zhang et al, 2013 ; Yi et al, 2014 ; Nikolaev et al, 2017 ). The method is based on the directional growth of metal nanowires and nanodendrites under the action of an AC voltage of high-frequency and a DC offset voltage applied between a pair of pre-structured electrodes.…”

Section: Introductionmentioning

confidence: 99%

Multisensor Systems by Electrochemical Nanowire Assembly for the Analysis of Aqueous Solutions

et al. 2018

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The development of electrochemical multisensor systems is driven by the need for fast, miniature, inexpensive, analytical devices, and advanced interdisciplinary based on both chemometric and (nano)material approaches. A multicomponent analysis of complex mixtures in environmental and technological monitoring, biological samples, and cell culture requires chip-based multisensor systems with high-stability sensors. In this paper, we describe the development, characterization, and applications of chip-based nanoelectrochemical sensor arrays prepared by the directed electrochemical nanowire assembly (DENA) of noble metals and metal alloys to analyze aqueous solutions. A synergic action of the electrode transducer function and electrocatalytic activity of the nanostructured surface toward analytes is achieved in the assembled metal nanowire (NW) sensors. Various sensor nanomaterials (Pd, Ni, Au, and their multicomponent compositions) can be electrochemically assembled on a single chip without employing multiple cycles of photolithography process to realize multi-analyte sensing applications as well as spatial resolution of sensor analysis by this single-chip multisensor system. For multi-analyte electrochemical sensing, individual amperometric signals of two or more nanowires can be acquired, making use of the specific electrocatalytic surface properties of the individual nanowire sensors of the array toward analytes. To demonstrate the application of a new electrochemical multisensor platform, Pd-Au, Pd-Ni, Pd, and Au NW electrode arrays on a single chip were employed for the non-enzymatic analysis of hydrogen peroxide, glucose, and ethanol. The analytes are determined at low absolute values of the detection potentials with linear concentration ranges of 1.0 × 10−6 − 1.0 × 10−3 M (H2O2), 1.5 × 10−7 − 2.0 × 10−3 M (glucose), and 0.7 × 10−3 − 3.0 × 10−2 M (ethanol), detection limits of 2 × 10−7 M (H2O2), 4 × 10−8 M (glucose), and 5.2 × 10−4 M (ethanol), and sensitivities of 18 μA M−1 (H2O2), 178 μA M−1 (glucose), and 28 μA M−1 (ethanol), respectively. The sensors demonstrate a high level of stability due to the non-enzymatic detection mode. Based on the DENA-assembled nanowire electrodes of a compositional diversity, we propose a novel single-chip electrochemical multisensor platform, which is promising for acquiring complex analytical signals for advanced data processing with chemometric techniques aimed at the development of electronic tongue-type multisensor systems for flexible multi-analyte monitoring and healthcare applications.

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Electrochemically Controlled Growth of AuPt Alloy Nanowires and Nanodendrites

Cited by 5 publications

References 56 publications

Composition Tunability and (111)-Dominant Facets of Ultrathin Platinum–Gold Alloy Nanowires toward Enhanced Electrocatalysis

Composition Tunability and (111)-Dominant Facets of Ultrathin Platinum–Gold Alloy Nanowires toward Enhanced Electrocatalysis

Bimetallic nanowire sensors for extracellular electrochemical hydrogen peroxide detection in HL-1 cell culture

Multisensor Systems by Electrochemical Nanowire Assembly for the Analysis of Aqueous Solutions

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