Size-tunable and scalable synthesis of uniform copper nanocrystals

Sim, Hwansu; Lee, Ji‐Hwan; Yu, Taekyung; Kim, Kyungpil; Lee, Seong Jun; Lee, Jung Heon; Cho, Jeong Ho; Lim, Byungkwon

doi:10.1039/c4ra09756d

Cited by 7 publications

(8 citation statements)

References 26 publications

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“…Similarly, TDA molecules in the outer layer cluster into 12 bundles. Interestingly, the optimal number of bundles does not conform to the number of facets in the Cu nanocrystal (25) or even the number of {111} and {100} facets (15). Instead, a bundle may be associated with multiple facets.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…6,17 In this method, the reaction solution consists of solvent, a Cu salt, and additives, such as reducing and capping agents. Long-chain alkylamine molecules, including dodecylamine, 18 tetradecylamine (TDA), 17,19 hexadecylamine (HDA), 6,17,20−22 octadecylamine (ODA), 17,23 and oleylamine, 24 have been used as capping agents in these syntheses, and a dependence on capping-agent concentration 6 and type 25 has been observed. A common hypothesis has been that the facet selectivity of alkylamine binding drives nanocrystal growth.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Among various methods to produce Cu nanocrystals, solution-phase synthesis has received considerable attention, since it produces nanocrystals at a large scale under moderate temperatures and pressures and with a low cost. , In this method, the reaction solution consists of solvent, a Cu salt, and additives, such as reducing and capping agents. Long-chain alkylamine molecules, including dodecylamine, tetradecylamine (TDA), , hexadecylamine (HDA), ,,− octadecylamine (ODA), , and oleylamine, have been used as capping agents in these syntheses, and a dependence on capping-agent concentration and type has been observed. A common hypothesis has been that the facet selectivity of alkylamine binding drives nanocrystal growth. , Thus, there is impetus to understand how linear alkylamines assemble around growing nanocrystals and how this assembly affects the growth morphology.…”

Section: Introductionmentioning

confidence: 99%

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Self-Assembly of a Linear Alkylamine Bilayer around a Cu Nanocrystal: Molecular Dynamics

Yan

Fichthorn

2021

J. Phys. Chem. B

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Copper nanocrystals are often grown with the help of alkylamine capping agents, which direct the nanocrystal shape. However, the role of these molecules is still unclear. We characterized the assembly of aqueous tetradecylamine (TDA) around a Cu nanocrystal and found that TDA exhibits a temperature-dependent bilayer structure. The bilayer involves an inner layer, in which TDA binds to Cu via the amine group and tends to orient the alkyl tail perpendicular to the surface, and an outer layer whose structure depends on temperature. At low temperatures, alkylamines in the inner layer form bundles with no apparent relation to the crystal facets. Alkylamines in the outer layer tend to orient their long axes perpendicular to the Cu surfaces, with interdigitation into the inner layer. At high temperatures, alkylamines in the inner layer lose their bundle structure, and outer-layer alkylamines tend to orient themselves tangential to the Cu surfaces, forming a “web” above inner-layer TDA. TDA exhibits a rapid interlayer exchange at typical synthesis temperatures, consistent with experiment. The variety in the assemblies seen here and in other studies of alkanethiols around gold nanocrystals indicates a richness in the assemblies that can be achieved by modulating the interaction between the strongly binding end group and the surface.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Self-Assembly of a Linear Alkylamine Bilayer around a Cu Nanocrystal: Molecular Dynamics

Yan

Fichthorn

2021

J. Phys. Chem. B

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“…[5,57,64] These techniques effectively suppress uncontrolled nanocrystal growth, and lead to the production of relatively uniform nanocrystals with tight size and shape distributions. More-reactive metals, such as Cu, [74,75] Ni, [76,77] Co, [78,79] Fe, [80,81] and Cr, [82] have also been synthesized through rigorous control of the reaction conditions in inert atmospheres. [60] The kinetic manipulation of reaction agents and conditions leads to the growth of different nanocrystals, including quantum dots, nanoparticles, nanorods, and nanosheets.…”

Section: Preparation Of Stable Nanomaterials Dispersionsmentioning

confidence: 99%

Assembly and Electronic Applications of Colloidal Nanomaterials

2016

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Artificial solids and thin films assembled from colloidal nanomaterials give rise to versatile properties that can be exploited in a range of technologies. In particular, solution-based processes allow for the large-scale and low-cost production of nanoelectronics on rigid or mechanically flexible substrates. To achieve this goal, several processing steps require careful consideration, including nanomaterial synthesis or exfoliation, purification, separation, assembly, hybrid integration, and device testing. Using a ubiquitous electronic device - the field-effect transistor - as a platform, colloidal nanomaterials in three electronic material categories are reviewed systematically: semiconductors, conductors, and dielectrics. The resulting comparative analysis reveals promising opportunities and remaining challenges for colloidal nanomaterials in electronic applications, thereby providing a roadmap for future research and development.

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“…Similar to the synthesis of other nanocrystals, the synthetic recipe of CuNPs usually involves a copper precursor, a reducing agent, and sometimes a surfactant, the combination of which finely tunes the sizes, dispersibility and uniformity of CuNPs [36][37][38][39][40][41][42][43][44][45]. The formation of CuNPs involves nucleation and growth stages, generally following the famous LaMer mechanism [46].…”

Section: Introductionmentioning

confidence: 99%

Copper nanomaterials and assemblies for soft electronics

Yang

Zhu

2019

Sci. China Mater.

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Soft electronics that can simultaneously offer electronic functions and the capability to be deformed into arbitrary shapes are becoming increasingly important for wearable and bio-implanted applications. The past decade has witnessed tremendous progress in this field with a myriad of achievements in the preparation of soft electronic conductors, semiconductors, and dielectrics. Among these materials, copper-based soft electronic materials have attracted considerable attention for their use in flexible or stretchable electrodes or interconnecting circuits due to their low cost and abundance with excellent optical, electrical and mechanical properties. In this review, we summarize the recent progress on these materials with the detailed discussions of the synthesis of copper nanomaterials, approaches for their assemblies, strategies to resist the ambient corrosion, and their applications in various fields including flexible electrodes, sensors, and other soft devices. We conclude our discussions with perspectives on the remaining challenges to make copper soft conductors available for more widespread applications.

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Size-tunable and scalable synthesis of uniform copper nanocrystals

Abstract: A facile and scalable synthetic route to uniform Cu nanocrystals with tunable sizes in the range of 20–100 nm based on an ethylene glycol-assisted synthetic method was developed.

Cited by 7 publications

References 26 publications

Self-Assembly of a Linear Alkylamine Bilayer around a Cu Nanocrystal: Molecular Dynamics

Self-Assembly of a Linear Alkylamine Bilayer around a Cu Nanocrystal: Molecular Dynamics

Assembly and Electronic Applications of Colloidal Nanomaterials

Copper nanomaterials and assemblies for soft electronics

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