1.7 nm Platinum Nanoparticles: Synthesis with Glucose Starch, Characterization and Catalysis

Engelbrekt, Christian; Sørensen, Karsten Holm; Lübcke, Teis; Zhang, Jingdong; Li, Qingfeng; Pan, Chao; Bjerrum, Niels; Ulstrup, Jens

doi:10.1002/cphc.201000380

Cited by 24 publications

(29 citation statements)

References 49 publications

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“…On Ag NPs modified electrode, peak at 0.4 V in the positive-going scan and 0.3 V in the negative-going scan were observed, corresponding to the oxidation and reduction of Ag and AgO x , respectively, which are in accordance with literature [28]. On Pt NPs modified electrode, the onset potential of hydrogen evolution reaction (HER) was negatively shifted due to the excellent catalytic activity of Pt NPs [29]. Obvious peak at ¡0.3 V corresponding to HER was observed, similar to that of Pt electrode in H 2 SO 4 solution.…”

Section: Anchoring Metal Nanoparticles By Thiol Sam Templatesupporting

confidence: 86%

A facile method to prepare noble metal nanoparticles modified Self-Assembly (SAM) electrode

Liu

Huang

Duan

et al. 2017

Journal of Experimental Nanoscience

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Noble metal nanoparticles (NPs) modified electrodes have shown promising applications in the areas of catalysis, (electro)chemical analysis and biosensing due to their unique characters. In this paper, we introduced a so-called ligand exchange method to prepare self-assembly (SAM) electrode modified with noble metal nanoparticles. The noble metal nanoparticles protected by weakly adsorbed tetraoctylammonium bromide (TOAB) were synthesized firstly, then self-assembly (SAM) dithiol-modified Au electrode (Au-SH SAM ) was immersed into the solutions containing TOAB-protected nanoparticles. Due to the strong interaction between the dithiol groups on the electrode and noble metal nanoparticles, the weakly adsorbed TOAB on the surface of noble metal NPs were replaced by dithiol groups. As a result, the TOAB protected NPs were anchored on the Au-SH SAM template electrode surface by ligand exchange, obtaining noble metal NPs modified electrode with high quality and stability. By adjusting the soaking time, the coverage of nanoparticles on the Au-SH SAM electrode surface could be controlled. The morphology and distribution of noble metal NPs on Au-SH SAM surface was analysis by scanning tunneling microscope (STM), and their electrochemical property was studied by cyclic voltammetry (CV) in H 2 SO 4 solution. The approach is proved as a universal way to prepare noble metal NPs modified SAM electrode.

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Section: Anchoring Metal Nanoparticles By Thiol Sam Templatesupporting

confidence: 86%

A facile method to prepare noble metal nanoparticles modified Self-Assembly (SAM) electrode

Liu

Huang

Duan

et al. 2017

Journal of Experimental Nanoscience

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“…Figure A shows a route demonstrated by Kneipp and co‐workers, in which large Au nanospheres and small Pt nanoparticles were separately prepared through the reduction of HAuCl 4 and H 2 PtCl 6 by sodium citrate and glucose/starch, respectively, at elevated temperatures, followed by the simultaneous immobilization of the as‐prepared nanoparticles to form a binary mixture on a solid substrate. Figure B shows a scanning electron microscopy (SEM) image of the binary mixture deposited on a glass slide, revealing both the 40 nm Au nanospheres and less than 2 nm Pt nanocrystals on the surface . Figure C shows a scanning tunneling microscopy (STM) image of the binary mixture deposited on highly ordered pyrolytic graphite (HOPG), confirming the SEM result.…”

Section: Design and Preparation Of Bifunctional Nanocrystalssupporting

confidence: 68%

“…Figure 4 B shows a scanning electron microscopy (SEM) image of the binary mixture deposited on a glass slide, revealing both the 40 nm Au nanospheres and less than 2 nm Pt nanocrystals on the surface. [22,28,29] Figure 4 C shows a scanning tunneling microscopy (STM) image of the binary mixture deposited on highly ordered pyrolytic graphite (HOPG), confirming the SEM result. It was found that continuous scanning of the STM tip would remove some of the Pt nanoparticles, suggesting that these two types of nanoparticles were not strongly linked to each other.…”

Section: Binary Mixture Of Au and Pt Nanocrystalssupporting

confidence: 67%

Bifunctional Metal Nanocrystals for Catalyzing and Reporting on Chemical Reactions

Shi

Qin

2019

Angew Chem Int Ed

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Bifunctional nanocrystals with integrated plasmonic and catalytic activities hold great promise for analyzing chemical reactions by in situ surface‐enhanced Raman spectroscopy. This Minireview gives a brief introduction to the general strategies for designing such nanocrystals, followed by four typical examples, including their fabrication, characterization, and potential limitation. We then use the reduction of 4‐nitrothiophenol and oxidation of 4‐aminothiophenol as two model systems to demonstrate the capabilities of these bifunctional nanocrystals to monitor chemical reactions for the elucidation of reaction mechanisms and measurement of kinetics. We conclude with perspectives on further development of these bifunctional nanocrystals into a viable platform for investigating other types of catalytic reactions.

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“…Platinum nanoparticles were synthesized following the saccharide‐based approach for the synthesis of metallic nanostructures (the SAMENS method) in phosphate buffer (pH 9) according to Ref. 12b. Gold and mixed platinum/gold nanostructured surfaces were prepared by immobilization of nanoparticles (particle ratio 1:1 in the mixture) by 3‐aminopropyltriethoxysilane 26…”

Section: Methodsmentioning

confidence: 99%

Characterizing the Kinetics of Nanoparticle‐Catalyzed Reactions by Surface‐Enhanced Raman Scattering

et al. 2012

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Determining the catalytic activity and the reaction kinetics are key issues when new catalysts are developed, characterized, and introduced. Catalysis at the nanoscale employing nanoparticles has great potential because of their new catalytic properties, high surface-to-volume ratios, and high surface reactivity. [1] In principle, reactions at the surface of metal structures can be studied using molecular surfacespecific spectroscopic techniques. [2] The most versatile of these is surface-enhanced Raman scattering (SERS), which has been frequently applied in investigations of different types of reactions at electrochemical interfaces in situ [3] to address, for example, the formation of reaction intermediates, [4] the dependence of electroorganic reactions on electrode potential, [5] and electron transfer in protein systems. [6] Herein we demonstrate that SERS can be used to study directly the kinetics of a catalytic reaction in situ. Our approach is novel by allowing the structural characterization of the reactant and product surface species in the reaction as well as investigating rate constants in the same experiment. This was possible by using separate gold and platinum nanoparticles that were simultaneously attached to the same glass surface. Our method is independent of the optical absorption properties of the reaction products and/or the catalysts.In order to investigate a metal-catalyzed reaction with SERS or other plasmon-supported approaches, [7] bifunctional metal structures are needed that have plasmonic properties and also act as a catalyst. [8] A number of catalytically active composite nanostructures have been reported to enhance the Raman signals of dye molecules, [9] and SERS has been used to monitor the structural evolution of bimetallic catalytically active Au-Pt nanoparticles. [10] However, direct observations of a catalytic process by SERS have been rare as they require bifunctional nanomaterials. [11] Our approach is different from those previously reported based on composite nanostructures with plasmonic (Au) and catalytic (Pt, [11a] or Pd) [11b] properties, as we have used separate gold and platinum nanoparticles that are simultaneously immobilized on a glass surface. Scanning tunneling microscopy (STM) data indicate that owing to the proximity of the platinum and gold nanoparticles, the molecules can interact with the platinum nanoparticles whilst they reside in the local optical fields provided by the localized surface plasmons of the gold nanoparticles. The versatility, stability, and general applicability of the immobilized gold nanoparticles for studying catalytic reactions are demonstrated by the quantification of the reaction products and the determination of the kinetics with different catalysts. The results reported therefore have implications both for basic catalysis research and analytical applications.Gold nanoparticles 40 nm in diameter and platinum nanoparticles less than 2 nm in diameter were prepared by reported procedures. [12] Mixtures of these gold and platinum nano...

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1.7 nm Platinum Nanoparticles: Synthesis with Glucose Starch, Characterization and Catalysis

Cited by 24 publications

References 49 publications

A facile method to prepare noble metal nanoparticles modified Self-Assembly (SAM) electrode

A facile method to prepare noble metal nanoparticles modified Self-Assembly (SAM) electrode

Bifunctional Metal Nanocrystals for Catalyzing and Reporting on Chemical Reactions

Characterizing the Kinetics of Nanoparticle‐Catalyzed Reactions by Surface‐Enhanced Raman Scattering

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