Effect of size, morphology, and synthesis method on the thermal and sintering properties of copper nanoparticles for use in microscale additive manufacturing processes

Roy, Nilabh K.; Foong, Chee S.; Cullinan, Michael

doi:10.1016/j.addma.2018.02.008

Cited by 32 publications

(23 citation statements)

References 34 publications

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“…The higher surface energies of NPs due to large surface area to volume ratio causes the NPs to agglomerate and form clusters [34][35][36] . Initial spreading results using nanoscale Cu powders confirmed these phenomena and showed the presence of large agglomerates in the bed of these nanoscale powders 37 . Regardless of the average particle size advertised by the manufacturer, the bed always contained agglomerates in the micron size range (see supplementary Fig.…”

Section: Nanoparticle Bed Formationmentioning

confidence: 80%

“…A detailed review of the effects of morphology and synthesis methods of NPs for use in micro-AM applications is presented by the authors in ref. 37 . For the current generation of μ-SLS, commercial Ag (JSA102A, NovaCentrix, Austin, US) and Cu (CI005-G,Intrinsiq Materials, UK) NP inks have been tested and are being used in the tool.…”

Section: Nanoparticle Bed Formationmentioning

confidence: 99%

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A novel microscale selective laser sintering (μ-SLS) process for the fabrication of microelectronic parts

et al. 2019

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One of the biggest challenges in microscale additive manufacturing is the production of three-dimensional, microscale metal parts with a high enough throughput to be relevant for commercial applications. This paper presents a new microscale additive manufacturing process called microscale selective laser sintering (μ-SLS) that can produce true 3D metal parts with sub-5 μm resolution and a throughput of greater than 60 mm 3 /hour. In μ-SLS, a layer of metal nanoparticle ink is first coated onto a substrate using a slot die coating system. The ink is then dried to produce a uniform nanoparticle layer. Next, the substrate is precisely positioned under an optical subsystem using a set of coarse and fine nanopositioning stages. In the optical subsystem, laser light that has been patterned using a digital micromirror array is used to heat and sinter the nanoparticles into the desired patterns. This set of steps is then repeated to build up each layer of the 3D part in the μ-SLS system. Overall, this new technology offers the potential to overcome many of the current limitations in microscale additive manufacturing of metals and become an important process in microelectronics packaging applications.

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Section: Nanoparticle Bed Formationmentioning

confidence: 80%

Section: Nanoparticle Bed Formationmentioning

confidence: 99%

A novel microscale selective laser sintering (μ-SLS) process for the fabrication of microelectronic parts

et al. 2019

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“…In the last decade, studies related to synthesis and application of Cu NPs has been of great interest from the academic and industrial point of view, due to its large potential for the replacement of expensive metals like silver and gold nanoparticles in the production of antibacterial and conductive materials [1,2]. Research regarding the use of Cu-based materials continues to grow in many diverse fields, for example, in 2018, its use in membranes for water purification [3], agriculture [4,5], electronics [6,7], catalysis [8][9][10][11], and so on, was reported.…”

Section: Introductionmentioning

confidence: 99%

Oxidation of Copper Nanoparticles Protected with Different Coatings and Stored under Ambient Conditions

Jardón-Maximino¹,

Pérez-Álvarez

Sierra-Ávila³

et al. 2018

Journal of Nanomaterials

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The synthesis of copper nanoparticles (Cu NPs) stable to chemical oxidation has attracted much attention due to their novel application possibilities. The physicochemical properties of Cu NPs define their utilization in diverse fields, including biological applications, solar cells, high conductivity inks for printed electronics, and other specific applications. In this study we present the synthesis of oxide-free Cu NPs by wet chemistry routes and their chemical oxidation during the storage exposed to ambient conditions. The Cu NPs synthesized in PAAm and AAm/glycerol presence exhibit no oxidation during synthesis and atmospheric conditions storage for 60 and 37 months, respectively. The obtained results compared with those coming from oxidation of partially passivated commercial Cu NPs at 99.8% purity, are presented. The role of the Cu NPs coating is critical to avoid oxidation, and it can be an important feature to achieve good dispersion in different polymers. The Cu NPs oxidation was studied by XRD, TGA, TEM, FTIR, and HR-TEM.

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“…More recently, great attention has been paid to copper nanoparticles (CuNPs) thanks to their excellent catalytic performances in VOCs oxidation [17][18]28]. Various methods for the synthesis of CuNPs have been developed, mainly based on the chemical reduction of metal salts or complexes [15,30]. In particular, the plant extracts acting as the reducing agents have been introduced to the bio-synthesis of metal nanoparticles, thanks to their low-cost and non-toxic features.…”

Section: Introductionmentioning

confidence: 99%

Green synthesis of copper nanoparticles using Cocoa pod extract and its catalytic activity in deep oxidation of aromatic hydrocarbons

et al. 2020

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An effective and green technique was performed for the synthesis of copper nanoparticles (CuNPs) from an organic resource using the Cocoa pod (CCP) extract as a reducing agent. The formation of CuNPs was confirmed by ultraviolet-visible absorption spectroscopy (UV-Vis) at the wavelength range of 500-600 nm. The optimized conditions for the synthesis of CuNPs using CCP extract as a reducing agent were determined by the volume ratio of Cu(NO 3) 2 solution/ CCP extract of 3.5/1.5, stirring rate of 300 rpm, pH solution of 7.5, the temperature of 75 °C and the synthesis duration within 180 min. At these conditions, the X-ray diffraction result revealed a face-centered cubic structure of zero-valent copper with a highly crystalline and an average size of 34.4 nm. Fourier transform infrared spectroscopy result confirmed the presence of flavonoids, polyphenolic, and alkaloids components in CCP extract which can act as the reducing and stabilizing agents for CuNPs formation. At the optimized synthetic conditions, CuNPs loaded on various supports (Al 2 O 3 , CeO 2 , and TiO 2) were prepared following the same protocol and then applied for catalytic deep oxidation of aromatic hydrocarbons (AHs). Among them, CeO 2 was the best support in AHs deep oxidation, and the sample of 7.5Cu-Ce (7.5 wt% of CuNPs supported on CeO 2) was the most efficient. Compared with 5Cu-Ce and 10Cu-Ce, the 7.5Cu-Ce sample exhibited a higher benzene conversion at a low temperature (275-325 °C) and reached the full conversions of benzene, toluene, ethylbenzene, and xylene (BTEX) to carbon dioxide and water vapor below 450 °C. Furthermore, the 7.5Cu-Ce sample showed great stability for such reactions at 300 °C as proven by the unchanged conversions of BTEX during 48 h.

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Effect of size, morphology, and synthesis method on the thermal and sintering properties of copper nanoparticles for use in microscale additive manufacturing processes

Cited by 32 publications

References 34 publications

A novel microscale selective laser sintering (μ-SLS) process for the fabrication of microelectronic parts

A novel microscale selective laser sintering (μ-SLS) process for the fabrication of microelectronic parts

Oxidation of Copper Nanoparticles Protected with Different Coatings and Stored under Ambient Conditions

Green synthesis of copper nanoparticles using Cocoa pod extract and its catalytic activity in deep oxidation of aromatic hydrocarbons

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