Formation of Pt decorated Ni–Pt nanocubes through low temperature atomic diffusion – time-resolved elemental analysis of nanoparticle formation

Nagao, Ayumu; Higashimine, Koichi; Huaman, Jhon L. Cuya; Isobe, Takashi; Matsumoto, Takatoshi; Inoue, Yasuhiro; Maenosono, Shinya; Miyamura, Hiroshi; Jeyadevan, Balachandran

doi:10.1039/c5nr01816a

Cited by 26 publications

(32 citation statements)

References 23 publications

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“…Thus, a novel synthesis technique is developed in the present study to obtain a large number of Pt seeds that subsequently get coated with nickel. This result in obtaining small-sized core (Pt)-shell (Ni) NPs in high yield, in which the Pt atoms diffuse to the surface as the reaction progresses [46]. The catalytic property evaluated using decolorization reaction of methylene blue confirmed the successful synthesis of designed Ni-Pt NPs with varying Pt distribution on the surface.…”

Section: Introductionmentioning

confidence: 85%

“…This was believed due to the formation of metal-OAm complexes that deters the reduction of Ni and Pt ions. Thus, to enhance the reaction efficiency, initially the synthesis of Ni-Pt was carried out for prolonged period of time following the experimental conditions reported by Nagao et al [46]. Although oleylamine has been considered to influence in metallic reduction, [47] the formation of metal-OAm complexes, their stability and reducibility are not well-known.…”

Section: Effect Of Oleylamine On the Synthesis Of Ni-pt Npsmentioning

confidence: 99%

“…On the other hand, the authors succeeded in synthesizing novel Ni-Pt nanocubes with Pt segregated on their edges and corners at lower reaction temperatures by using 1-heptanol as a weak reducing agent [27]. The investigation on the growth mechanism of the Ni-Pt nanocubes revealed that the Pt atoms in the particle diffuse and reach the surface of the cubic-shaped Ni particles to form the Pt cage structure [46]. These particles exhibited about three times higher catalytic activity than the commercial Pt [21], due to its unique elemental distribution in nanoscale [46].…”

Section: Introductionmentioning

confidence: 99%

“…However, the drawback of this process was that the yield of the particles was very low due to the difficulty in reducing Pt ions. Consequently, the size was relatively large compared to conventional catalyst particles [46]. Considering the formation mechanism, the size and yield can be improved by increasing the number of Pt seeds formed at the initial stages of the reaction.…”

Section: Introductionmentioning

confidence: 99%

“…In the conventional method, oleylamine (OAm) influenced the formation of cubic shaped-Pt cage structure but large concentration of Pt ions remained in the solution even at the end the reaction. This is because OAm may have facilitated the formation of metal-OAm complexes [47], which are relatively difficult to reduce [46].…”

Section: Introductionmentioning

confidence: 99%

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Designed synthesis of highly catalytic Ni–Pt nanoparticles for fuel cell applications

et al. 2018

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A modified alcohol reduction process by controlling the complexation and reduction of metallic ions was developed to obtain compositionally and structurally controlled Ni-Pt nanoparticles (NPs) with sizes less than 20 nm in a high yield. The characterization of NPs synthesized under different experimental conditions suggested that the reduction of Pt and subsequent formation of cubic-shaped Ni-Pt NPs were strongly dependent on the formation of Pt-oleylamine (OAm) complexes. Thus, prior to the synthesis of Ni-Pt NPs, the formation and reduction process of Pt complexes in the solution-state were investigated by in situ UV-Visible and X-ray spectroscopies. The complexation of Pt ions along with their reduction prior to the formation of Pt metal and their influence on the size and the elemental distribution of Pt within the Ni-Pt NPs were revealed. Then, the above findings were actively utilized to design and to obtain Pt(core)-Ni(shell), Ni-Pt alloy, and Ni(core)-Pt(shell) nanostructures by regulating the OAm concentration in the system. The specific distribution of Pt on the Ni-Pt surface was confirmed by decolorization of methylene blue. Furthermore, Ni-Pt NPs with a Pt concentration of 10 at.% exhibited a mass activity four times larger than that of commercial Pt during the oxygen reduction reaction (ORR).

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Section: Introductionmentioning

confidence: 85%

Section: Effect Of Oleylamine On the Synthesis Of Ni-pt Npsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Designed synthesis of highly catalytic Ni–Pt nanoparticles for fuel cell applications

et al. 2018

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A Nanoporous Carbon‐MXene Heterostructured Nanocomposite‐Based Epidermal Patch for Real‐Time Biopotentials and Sweat Glucose Monitoring

Zahed

Sharifuzzaman

Yoon

et al. 2022

Adv Funct Materials

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Despite substantial progress in the development of wearable and flexible monitoring systems that conform to the epidermis, most designs focus on either physiological signs such as the electrocardiogram (ECG) results, respiration rate, or metabolites, and ignore the dynamic fluctuations of pH and temperature in sweat during on‐body tests. An advanced butterfly‐inspired hybrid epidermal biosensing (bi‐HEB) patch is presented here, which is interfaced with a custom‐developed miniaturized monitoring system. The patch incorporates a novel transducing layer of nanoporous carbon and MXene (NPC@MXene) for sensitive and durable detection of biomarkers in sweat. The bi‐HEB patch is composed of a glucose biosensor accompanied by pH and temperature sensors to precisely quantify glucose as well as two biopotential electrodes, allowing real‐time recording of electrophysiological (EP) signals. The NPC@MXene‐based glucose biosensor demonstrates an excellent sensitivity of 100.85 µAmm−1 cm−2 within physiological levels (0.003−1.5 mm), and variations in pH and temperature during on‐body perspiration monitoring are calibrated by employing a correction approach. In parallel, the EP electrodes exhibit skin‐electrode contact impedance and biopotential signals similar to those of conventional Ag/AgCl electrodes. Finally, the bi‐HEB patch integrated wearable system is used to accurately monitor sweat glucose and ECG of human subjects participating in indoor physical activities.

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Site‐Specific Wetting of Iron Nanocubes by Gold Atoms in Gas‐Phase Synthesis

et al. 2019

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A key challenge in nanotechnology is the rational design of multicomponent materials that beat the properties of their elemental counterparts. At the same time, when considering the material composition of such hybrid nanostructures and the fabrication process to obtain them, one should favor the use of nontoxic, abundant elements in view of the limited availability of critical metals and sustainability. Cluster beam deposition offers a solvent‐ and, therefore, effluent‐free physical synthesis method to achieve nanomaterials with tailored characteristics. However, the simultaneous control of size, shape, and elemental distribution within a single nanoparticle in a small‐size regime (sub‐10 nm) is still a major challenge, equally limiting physical and chemical approaches. Here, a single‐step nanoparticle fabrication method based on magnetron‐sputtering inert‐gas condensation is reported, which relies on selective wetting of specific surface sites on precondensed iron nanocubes by gold atoms. Using a newly developed Fe–Au interatomic potential, the growth mechanism is decomposed into a multistage model implemented in a molecular dynamics simulation framework. The importance of growth kinetics is emphasized through differences between structures obtained either experimentally or computationally, and thermodynamically favorable configurations determined via global optimization techniques. These results provide a roadmap for engineering complex nanoalloys toward targeted applications.

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Formation of Pt decorated Ni–Pt nanocubes through low temperature atomic diffusion – time-resolved elemental analysis of nanoparticle formation

Cited by 26 publications

References 23 publications

Designed synthesis of highly catalytic Ni–Pt nanoparticles for fuel cell applications

Designed synthesis of highly catalytic Ni–Pt nanoparticles for fuel cell applications

A Nanoporous Carbon‐MXene Heterostructured Nanocomposite‐Based Epidermal Patch for Real‐Time Biopotentials and Sweat Glucose Monitoring

Site‐Specific Wetting of Iron Nanocubes by Gold Atoms in Gas‐Phase Synthesis

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