Dual step irradiation process for in situ generation and patterning of silver nanoparticles in a photocured film

Roppolo, Ignazio; Bozzo, A. Doriguzzi; Castellino, Micaela; Chiappone, Annalisa; Perrone, Denis; Bocchini, Sergio; Sangermano, Marco; Chiolerio, Alessandro

doi:10.1039/c5ra24234g

Cited by 13 publications

(18 citation statements)

References 54 publications

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“…This was already observed in some previous work [44,46] and could be explained with the general diffusion laws.…”

Section: Resultssupporting

confidence: 83%

“…Moreover, in both cases a relative enrichment of nanoparticles concentration could be observed at 3D printed structure surface ( Figure 5 b) with respect to the core of the structure ( Figure 5 c). This was already observed in some previous work [ 44 , 46 ] and could be explained with the general diffusion laws.…”

Section: Resultssupporting

confidence: 83%

“…This can be related to a nucleation-growth mechanism of the silver nanoparticles within the matrix [46]. …”

Section: Resultsmentioning

confidence: 99%

“…While 3D printed objects containing nitrate are heated, an irreversible color change is observed: The object evolves from a red color, ( Figure 2 a), to a dark brown until, for higher treatment temperatures, it reaches a silver mirror aspect ( Figure 2 b). This can be related to a nucleation-growth mechanism of the silver nanoparticles within the matrix [ 46 ].…”

Section: Resultsmentioning

confidence: 99%

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In Situ Thermal Generation of Silver Nanoparticles in 3D Printed Polymeric Structures

et al. 2016

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Polymer nanocomposites have always attracted the interest of researchers and industry because of their potential combination of properties from both the nanofillers and the hosting matrix. Gathering nanomaterials and 3D printing could offer clear advantages and numerous new opportunities in several application fields. Embedding nanofillers in a polymeric matrix could improve the final material properties but usually the printing process gets more difficult. Considering this drawback, in this paper we propose a method to obtain polymer nanocomposites by in situ generation of nanoparticles after the printing process. 3D structures were fabricated through a Digital Light Processing (DLP) system by disolving metal salts in the starting liquid formulation. The 3D fabrication is followed by a thermal treatment in order to induce in situ generation of metal nanoparticles (NPs) in the polymer matrix. Comprehensive studies were systematically performed on the thermo-mechanical characteristics, morphology and electrical properties of the 3D printed nanocomposites.

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“…This was already observed in some previous work [44,46] and could be explained with the general diffusion laws.…”

Section: Resultssupporting

confidence: 83%

Section: Resultssupporting

confidence: 83%

“…This can be related to a nucleation-growth mechanism of the silver nanoparticles within the matrix [46]. …”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

In Situ Thermal Generation of Silver Nanoparticles in 3D Printed Polymeric Structures

et al. 2016

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“…It is also possible to use broadband UV light, where photogenerated acyl radicals present in the ink formulation [ 58,59 ] can reduce the silver ions and generate silver nanoparticles that can migrate to the surface of the ink deposit and produce a conductive silver film. [ 59,60 ] The ability of silver salts to transform into silver films through the in situ production of a silver nanoparticle matrix following exposure to UV light, coupled with the ability to tune the decomposition temperature of the silver salts with amine additives, could enable the development of an ink that is capable of undergoing elongation prior to being converted to a conductive metallic films during the thermoforming process. The production of elongated conductive films based on molecular inks utilizing such a process would be advantageous in comparison to commercially available flake inks because it eliminates the need to add high proportions of elastomeric polymers to impart stretchability to the traces, which should result in thermoformed, 3D traces with superior conductivities in comparison to flake based inks.…”

Section: Introductionmentioning

confidence: 99%

UV‐Sinterable Silver Oxalate‐Based Molecular Inks and Their Application for In‐Mold Electronics

Fukutani

et al. 2021

Adv Elect Materials

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A new broadband UV light‐based processing method for a screen printable silver oxalate molecular ink is developed that enables structural electronics to be produced on complex thermoformed 3D objects. The production of these 3D devices is driven by the light‐induced reduction of silver oxalate to form an interfacial silver nanoparticle layer that allows the ink to transition to a viscous liquid intermediate and elongate up to 50% without cracking during thermoforming. Ultimately, this enables the development of 3D electronics devices with significantly less limitations on geometry, shape, size, and depth in comparison to commercially available inks. UV processing is also effective for 2D traces on low temperature PET substrate, where in situ produced silver nanoparticles can subsequently absorb light and further facilitate the rapid conversion of the silver oxalate to metallic silver through a self‐limiting thermal decomposition. The resulting traces have superior electrical properties and are produced in significantly less time in comparison to thermal sintering. Together, UV processing and the silver oxalate molecular ink serve as a platform for both the rapid production of conductive silver traces on low temperature substrates and the development of novel thermoformed 3D human‐machine interface devices, areas of interest for both academia and industry.

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Photoinitiators in Specific Polymerization Processes

2021

Photoinitiators

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Dual step irradiation process for in situ generation and patterning of silver nanoparticles in a photocured film

Abstract: Novel dual step irradiation process for the in situ generation and patterning of silver nanoparticles in a photocured matrix was developed.

Cited by 13 publications

References 54 publications

In Situ Thermal Generation of Silver Nanoparticles in 3D Printed Polymeric Structures

In Situ Thermal Generation of Silver Nanoparticles in 3D Printed Polymeric Structures

UV‐Sinterable Silver Oxalate‐Based Molecular Inks and Their Application for In‐Mold Electronics

Photoinitiators in Specific Polymerization Processes

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