Spiky niobium oxide nanoparticles through hydrothermal synthesis

Fuchigami, Teruaki; Kakimoto, Ken‐ichi

doi:10.1557/jmr.2017.200

Cited by 16 publications

(17 citation statements)

References 36 publications

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“…Increasing the temperature to 190 °C, the approximate major axis length increased to 30 nm, and the nanorods were separated from each other (Figure 1j–l and S4, Supporting Information). There was no change in morphology between 190 and 200 °C samples, and as in previous reports, [ 14,17,18 ] the spiky Nb 2 O 5 nanoparticles composed of a spherical core and numerous nanorods were obtained (Figure 1m–o and S5, Supporting Information). These results suggested that the nanorods grew by migration not only from a spherical core but also among primal particles, rectangular‐shaped nanoarchitectures, and nanorods.…”

Section: Resultssupporting

confidence: 88%

“…Oxalic acid, which has two carboxyl groups, must adsorb on Nb 2 O 5 in hydrothermal synthesis and suppress particle growth similar to acetate ions. However, considering the decomposition temperature of oxalic acid to formic acid and carbonate ions around 180–200 °C, [ 18 ] it will disappear from the surface and lose the protecting function. Therefore, as shown in Figure 3 , we have proposed the growing mechanism of a spiky nanostructure.…”

Section: Resultsmentioning

confidence: 99%

“…At this time, the entire amount of niobium oxide precursor was expended by the formation of the spherical cores. [ 18 ] Crystallinity increased as the synthesis temperature increased from 160 to 170 °C, where some of the oxalate ions transform into formate ions via thermal decomposition. According to the lattice parameters of Nb 2 O 5 , the growth of the c crystal plane is faster than the others; therefore, the surface morphology changes to a rectangular shape with crystallization.…”

Section: Resultsmentioning

confidence: 99%

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Growth Mechanism of Spiky Nb₂O₅ Nanoparticles and their Electrochemical Property

Fuchigami

Yamamoto

Tanibata

et al. 2022

Physica Status Solidi (b)

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Spiky nanoarchitecture composed of numerous nanorods and a spherical core has applications in various fields because of its high performance and durability. However, controlling the spiky structure is challenging because of an unclear formation mechanism. This study investigates the growth mechanism of spiky nanostructure by hydrothermally synthesizing Nb2O5 with various conditions and additives, and it is shown that adsorption and gradual decomposition of ligands promote the formation of the spiky shape. Using oxalic acid as an additive and synthesizing at 160 °C, which is below oxalic acid's decomposition temperature, spherical Nb2O5 with a rough surface that consists of a nanostructure with less than 5 nm size forms, and its surface is protected by oxalate ions. When the synthesis temperature increases to 180 °C, oxalate ions are decomposed, and nanorods grow on the spherical particles. The results show that oxalate ions suppress particle growth, promote self‐assembly, and control subsequent particle growth, resulting in complex nanostructures. When used as anode material in lithium‐ion batteries, the spiky Nb2O5 nanoparticles show a higher capacity (143 mAh g−1) than collapsed spiky particles (92 mAh g−1) and nanorods (37 mAh g−1) because of fast lithium‐ion diffusion on the surface nanostructure and high dispersibility.

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Section: Resultssupporting

confidence: 88%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Growth Mechanism of Spiky Nb₂O₅ Nanoparticles and their Electrochemical Property

Fuchigami

Yamamoto

Tanibata

et al. 2022

Physica Status Solidi (b)

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“…In particular, rough and ''spiky'' spheres could be used as catalysts due to their larger surface. 29 Moreover, ''smooth spheres'' with nanometric dimensions can easily enter cells and be applied in drug delivery and photodynamic therapy. 30 Finally, hydrogels can be utilized for biomedical applications.…”

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confidence: 99%

Self-assembly of aliphatic dipeptides coupled with porphyrin and BODIPY chromophores

et al. 2019

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In this work, the self assembly ability of chromophores covalently linked to aliphatic dipeptides is described. Altering various parameters such as the protecting group, the solvent mixture, the dipeptide and the chromophore resulted in different nanostructures.Interestingly, a peptide-porphyrin hybrid is capable of forming a hydrogel in HFIP-water solvent mixture.Living natural systems utilize self-assembly in order to fulfil their functions; thus, understanding the basic aspects of this process takes us a step closer to the comprehension of life. 1 Numerous examples in nature have inspired supramolecular scientists to synthesize molecules with self-assembling ability aiming at the construction of materials with improved properties. 2 Self-assembled architectures that mimic chlorophylls and bacteriochlorophylls in nature are of great interest for light harvesting applications. 3 A variety of bioinspired building blocks have been explored for the fabrication of self-assembling molecules including peptides, 4,5 nucleic acids, 6,7 peptide nucleic acids, 8,9 lipids etc. Of the small peptides, diphenylalanine (FF), the basic structural motif for the Alzheimer's beta amyloid polypeptide, is an aromatic dipeptide that has been extensively investigated for its self-assembling properties. 10,11 More specifically, a great number of chromophores such as porphyrins, 12-15 boron-dipyrromethenes, 16 corroles, 17 polyoxometallates 18 and ferrocene 19 have been covalently connected to FF resulting in hybrids that retained the ability to form well-defined nanostructures. In addition, small aliphatic peptides have also been investigated for their self-assembly ability. 20 In a recent example, Yan and co-workers reported that a short peptide based on

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“…Surfactants with one coordination site (e.g., oleic acid, oleylamine, carbonic acid, nitric acid, and acetate acid) are commonly used to generate simple 0D to 3D nanostructures such as nanocubes, nanorods, and nanosheets [16,26,27]. In contrast, surfactants with two or more coordination sites (e.g., urea, phosphoric acid, and oxalic acid) are often used to synthesize complex 3D nanostructures [23,24,25,28,29,30,31,32]. Coordination molecules with one coordination site adsorb on particle surfaces to suppress particle aggregation, particle growth, and the growth of specific crystal planes, resulting in simple structures.…”

Section: Introductionmentioning

confidence: 99%

Complex Three-Dimensional Co3O4 Nano-Raspberry: Highly Stable and Active Low-temperature CO Oxidation Catalyst

et al. 2018

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Highly stable and active low-temperature CO oxidation catalysts without noble metals are desirable to achieve a sustainable society. While zero-dimensional to three-dimensional Co3O4 nanoparticles show high catalytic activity, simple-structured nanocrystals easily self-aggregate and become sintered during catalytic reaction. Thus, complex three-dimensional nanostructures with high stability are of considerable interest. However, the controlled synthesis of complex nanoscale shapes remains a great challenge as no synthesis theory has been established. In this study, 100 nm raspberry-shaped nanoparticles composed of 7–8 nm Co3O4 nanoparticles were synthesized by hydrothermally treating cobalt glycolate solution with sodium sulfate. Surface single nanometer-scale structures with large surface areas of 89 m2·g−1 and abundant oxygen vacancies were produced. The sulfate ions functioned as bridging ligands to promote self-assembly and suppress particle growth. The Co3O4 nano-raspberry was highly stable under catalytic tests at 350 °C and achieved nearly 100% CO conversion at room temperature. The addition of bridging ligands is an effective method to control the formation of complex but ordered three-dimensional nanostructures that possessed extreme thermal and chemical stability and exhibited high performance.

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Spiky niobium oxide nanoparticles through hydrothermal synthesis

Abstract: Abstract

Cited by 16 publications

References 36 publications

Growth Mechanism of Spiky Nb₂O₅ Nanoparticles and their Electrochemical Property

Growth Mechanism of Spiky Nb₂O₅ Nanoparticles and their Electrochemical Property

Self-assembly of aliphatic dipeptides coupled with porphyrin and BODIPY chromophores

Complex Three-Dimensional Co3O4 Nano-Raspberry: Highly Stable and Active Low-temperature CO Oxidation Catalyst

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Spiky niobium oxide nanoparticles through hydrothermal synthesis

Abstract: Abstract

Cited by 16 publications

References 36 publications

Growth Mechanism of Spiky Nb2O5 Nanoparticles and their Electrochemical Property

Growth Mechanism of Spiky Nb2O5 Nanoparticles and their Electrochemical Property

Self-assembly of aliphatic dipeptides coupled with porphyrin and BODIPY chromophores

Complex Three-Dimensional Co3O4 Nano-Raspberry: Highly Stable and Active Low-temperature CO Oxidation Catalyst

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Growth Mechanism of Spiky Nb₂O₅ Nanoparticles and their Electrochemical Property

Growth Mechanism of Spiky Nb₂O₅ Nanoparticles and their Electrochemical Property