Growth of Pt Nanowires by Atomic Layer Deposition on Highly Ordered Pyrolytic Graphite

Lee, Han‐Bo‐Ram; Baeck, Sung Hyeon; Jaramillo, Thomas F.; Bent, Stacey F.

doi:10.1021/nl303803p

Cited by 85 publications

(106 citation statements)

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“…Because the external edges of graphene show greater chemical reactivity than the basal plane of graphene, Pd NPs prefer to nucleate on the external edges of graphene. 15,31 In contrast to the external edges, the internal edges do not initiate Pd nucleation because they are covered by another graphene layer. 22 Therefore, the selective deposition of Pd NPs shown in Figures 4a-c occurred along the external edges of the graphene layer, such as layer (iii), but not the internal edges.…”

Section: Resultsmentioning

confidence: 99%

A facile method for the selective decoration of graphene defects based on a galvanic displacement reaction

Hong

Lee

et al. 2016

NPG Asia Mater

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Inherent defects, such as grain boundaries (GBs), wrinkles and structural cracks, present on chemical vapor deposition (CVD)-grown graphene are inevitable because of the mechanism used for its synthesis. Because graphene defects are detrimental to electrical transport properties and degrade the performance of graphene-based devices, a defect-healing process is required. We report a simple and effective approach for enhancing the electrical properties of graphene by selective graphene-defect decoration with Pd nanoparticles (Pd NPs) using a wet-chemistry-based galvanic displacement reaction. According to the selective nucleation and growth behaviors of Pd NPs on graphene, several types of defects, such as GBs, wrinkles, graphene regions on Cu fatigue cracks and external edges of multiple graphene layers, were precisely confirmed via spherical aberration correction scanning transmission electron microscopy, field-emission scanning electron microscopy and atomic force microscopy imaging. The resultant Pd-NP-decorated graphene films showed improved sheet resistance. A transparent heater was fabricated using Pd-decorated graphene films and exhibited better heating performance than a heater fabricated using pristine graphene. This simple and novel approach promises the selective decoration of defects in CVD-grown graphene and further exploits the visualization of diverse defects on a graphene surface, which can be a versatile method for improving the properties of graphene.

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Section: Resultsmentioning

confidence: 99%

A facile method for the selective decoration of graphene defects based on a galvanic displacement reaction

Hong

Lee

et al. 2016

NPG Asia Mater

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“…Metals can be deposited on graphite using a wide variety of techniques, ranging from wet (chemical) methods to gas-phase methods [11,[13][14][15][16]. As mentioned in the Introduction, this article focuses on the method of physical vapor deposition, because in that process, single atoms impinge on the graphite surface, leading most directly to atomic-scale insights.…”

Section: Overview Of the Experimental Contextmentioning

confidence: 99%

“…This can be viewed as a manifestation of coarsening, and is not unexpected. Another technique leading to pure step decoration is growth from an organometallic precursor, demonstrated with Pt [16].There have been two reports that HOPG steps of different heights are decorated differently, though both involved sample transfers in air [25,100]. In the first, Hennig reported SEM data showing that "the capacity for a [HOPG] step to capture an adatom [of Ag or Au], i.e.…”

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Transition metals on the (0 0 0 1) surface of graphite: Fundamental aspects of adsorption, diffusion, and morphology

Appy

Lei

Wang

et al. 2014

Progress in Surface Science

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In this article, we review basic information about the interaction of transition metal atoms with the (0001) surface of graphite, especially fundamental phenomena related to growth. Those phenomena involve adatomsurface bonding, diffusion, morphology of metal clusters, interactions with steps and sputter-induced defects, condensation, and desorption. General traits emerge which have not been summarized previously. Some of these features are rather surprising when compared with metal-on-metal adsorption and growth. Opportunities for future work are pointed out. Chemistry | Materials Science and Engineering | PhysicsComments NOTICE: This is the author's version of a work that was accepted for publication in Progress in Surface Science. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publications. A definitive version was subsequently published in Progress in Surface Science, 89 (2014), doi: 10.1016/j.progsurf.2014.08.001. AuthorsDavid Victor Appy, Huaping Lei, Cai-Zhuang Wang, Michael C. Tringides, Da-Jiang Liu, James W. Evans, and Patricia A. Thiel This article is available at Iowa State University Digital Repository: http://lib.dr.iastate.edu/chem_pubs/99 1 NOTICE: This is the author's version of a work that was accepted for publication in Progress in Surface Science. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publications. A definitive version was subsequently published in Progress in Surface Science, 89 (2014) Abstract.In this article, we review basic information about the interaction of transition metal atoms with the (0001) surface of graphite, especially fundamental phenomena related to growth. Those phenomena involve adatom-surface bonding, diffusion, morphology of metal clusters, interactions with steps and sputter-induced defects, condensation, and desorption. General traits emerge which have not been summarized previously. Some of these features are rather surprising when compared with metal-onmetal adsorption and growth. Opportunities for future work are pointed out. 1.Introduction.Graphite is an intriguing support for metals because of its inertness in aggressive environments, as well as its low cost and high abundance. A major application for graphite-supported metals is lithium ion batteries [1,2]. In fact, the demand for these batteries is expanding so quickly that it currently drives the international market in graphite [1]. An important application on the horizon is biofuel conversion, where graphite (or other carbon-based materials) may provide robust supports for catalysts in aqueous media [3].Adsorption of transition metals and noble metals on graphite has been studi...

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“…Since the pristine CNTs are chemically inert and hydrophobic, a majority of the research has been dedicated to modifying their surface in order to promote better dispersion of Pt NPs. Recently, functionalization of carbon nanomaterials including nanocages [15], nanowires [16] and nanoclusters [17] through non-covalent attachment of polyelectrolyte has been developed to facilitate the growth of Pt NPs with well-defined shape and tunable size. As a versatile strategy, polyelectrolyte modification not only preserves the intrinsic structure of CNTs, but also achieves the tailored properties of the nanocomposites [18].…”

Section: Introductionmentioning

confidence: 99%

An Effective Approach towards the Immobilization of PtSn Nanoparticles on Noncovalent Modified Multi-Walled Carbon Nanotubes for Ethanol Electrooxidation

et al. 2016

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Abstract:In this article, we describe an effective method to tether Pt and PtSn nanoparticles (NPs) on polyelectrolyte modified multi-walled carbon nanotubes (MWCNTs) for ethanol electrooxidation. By using a polymer wrapping technique, positively charged polyethyleneimine (PEI) was attached onto carbon nanotubes (CNTs) to provide preferential linking sites for metal precursors. Well-dispersed Pt and PtSn nanocrystals (2-5 nm) were subsequently decorated on PEI-functionalized MWCNTs through the polyol reduction method. The successful non-covalent modification of MWCNTs was confirmed by Fourier transform infrared spectroscopy (FTIR) and Zeta potential measurements. Energy dispersive X-ray (EDX) spectrum indicates approximately 20 wt % Pt loading and a desirable Pt:Sn atomic ratio of 1:1. Electrochemical analysis demonstrated that the as-synthesized PtSn/PEI-MWCNTs nanocomposite exhibited improved catalytic activity and higher poison tolerance for ethanol oxidation as compared to Pt/PEI-MWCNTs and commercial Pt/XC-72 catalysts. The enhanced electrochemical performance may be attributed to the uniform dispersion of NPs as well as the mitigating of CO self-poisoning effect by the alloying of Sn element. This modification and synthetic strategy will be studied further to develop a diversity of carbon supported Pt-based hybrid nanomaterials for electrocatalysis.

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Growth of Pt Nanowires by Atomic Layer Deposition on Highly Ordered Pyrolytic Graphite

Cited by 85 publications

References 53 publications

A facile method for the selective decoration of graphene defects based on a galvanic displacement reaction

A facile method for the selective decoration of graphene defects based on a galvanic displacement reaction

Transition metals on the (0 0 0 1) surface of graphite: Fundamental aspects of adsorption, diffusion, and morphology

An Effective Approach towards the Immobilization of PtSn Nanoparticles on Noncovalent Modified Multi-Walled Carbon Nanotubes for Ethanol Electrooxidation

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