Gold-nanoparticle Inks for Room-temperature Formation of Conductive Films

Yamauchi, Hirofumi; Dobashi, Tetsuaki; Sato, Seiichi

doi:10.1246/cl.2012.1154

Cited by 4 publications

(3 citation statements)

References 34 publications

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“…Sometimes, decomposition of an organic Cu complex is required for sintering. 25 Even though some other annealing methods have been suggested to substitute the conventional annealing procedure using ultrasound, 26 laser, 27,28 IR, 29 plasma, 30 and microwaves, 31 these methods still consume high energy or often result in incomplete annealing. 32,33 Therefore, conductive inks that are of low cost and that can be sintered at lower temperature without reductive gases or any additives are desirable.…”

Section: Introductionmentioning

confidence: 99%

A new approach for additive-free room temperature sintering of conductive patterns using polymer-stabilized Sn nanoparticles

et al. 2016

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Tin nanoparticles (Sn NPs) are of considerable interest for conductive printing because of their low melting temperature and low cost. In the present study, polyvinylpyrrolidone (PVP) stabilized metallic Sn NPs were synthesized by a polyol process and the size of Sn NPs was controlled from 15 to 89 nm by adjusting the amount of PVP. For the first time, we demonstrated that conductive patterns fabricated from the inks of metallic Sn NPs were achieved readily at room temperature under N-2 without reducing gases or additives. The lowest obtained resistivity was 1.1 x 10 (3) Omega cm, which was 100 times higher than that of bulk Sn. The size of Sn NPs, the amount of the stabilizing agent, and the low melting temperature of Sn NPs were found to be the main factors controlling the conductivity of the obtained Sn pattern in room temperature sintering. This study offers a new approach for the room temperature fabrication of conductive electronics using the printing technique

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Section: Introductionmentioning

confidence: 99%

A new approach for additive-free room temperature sintering of conductive patterns using polymer-stabilized Sn nanoparticles

et al. 2016

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“…In this direction, chemical approaches have also been explored to induce sintering of printed nanomaterials, including gases, ionic compounds, and salts, sometimes using cumbersome procedures with difficult (or impossible) industrial implementation or losing the inherent nanostructure properties of the nanoparticles. [50][51][52][53][54][55] In this context, chemically induced sintering of noble MNPs inks remains an important challenge.…”

Section: Introductionmentioning

confidence: 99%

Nanostructure Tuning of Gold Nanoparticles Films via Click Sintering

Urban,

Rosati,

Maroli

et al. 2023

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Colloidal metal nanoparticles dispersions are commonly used to create functional printed electronic devices and they typically require time‐, energy‐ and equipment‐consuming post‐treatments to improve their electrical and mechanical properties. Traditional methods, e.g. thermal, UV/IR, and microwave treatments, limit the substrate options and may require expensive equipment, not available in all the laboratories. Moreover, these processes also cause the collapse of the film (nano)pores and interstices, limiting or impeding its nanostructuration. Finding a simple approach to obtain complex nanostructured materials with minimal post‐treatments remains a challenge. In this study, a new sintering method for gold nanoparticle inks that called as “click sintering” has been reported. The method uses a catalytic reaction to enhance and tune the nanostructuration of the film while sintering the metallic nanoparticles, without requiring any cumbersome post‐treatment. This results in a conductive and electroactive nanoporous thin film, whose properties can be tuned by the conditions of the reaction, i.e., concentration of the reagent and time. Therefore, this study presents a novel and innovative one‐step approach to simultaneously sinter gold nanoparticles films and create functional nanostructures, directly and easily, introducing a new concept of real‐time treatment with possible applications in the fields of flexible electronics, biosensing, energy, and catalysis.

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“…Aggregations of precious metal nanoparticles such as Au, Pt, or Ag may be readily sintered to provide electrically continuous materials. There are a number of actual or potential commercial applications of this technology as well as considerable recent scientific interest in it. − Recent efforts have been directed toward developing formulations that sinter at the lowest practicable temperatures to enable inks made from these nanoparticles to be applied to polymer or other heat-sensitive substrates. , We have shown previously that sintering can be facilitated by an oxidizing environment, and remarkably, the temperature at which it occurs can even be brought down to 25 °C by these means…”

Section: Introductionmentioning

confidence: 99%

On the Coalescence of Nanoparticulate Gold Sinter Ink

et al. 2013

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We examine the mechanism by which thiol-protected gold nanoparticle inks can sinter at surprisingly low temperatures. At room temperature the sample is comprised of randomly close-packed gold nanoparticles of about 2.3 nm diameter with a ligand shell of about 0.2 nm effective thickness. As the particles are heated through 80 °C they begin to coarsen, reaching about 10 nm diameter at 180 °C. Upon further heating, rapid sintering and grain growth occurs at a temperature that depends on environment and heating rate. Sintering in vacuum requires a higher temperature than in oxidizing environments. Mass spectrometry in the former case is consistent with volatile species such as C4H9, C2SH, and C2H4 being displaced, whereas XPS shows that the exposed surface of the Au is rich in C and S. However, when sintering is performed in the presence of even trace O2, it is the Au–S bond that is cleaved, and the sintering temperature is lowered by up to 50 °C. In this case mass spectrometry shows the generation of alkane and thiol fragments, some S2 and H2S, and oxidized sulfur-containing species, whereas XPS shows that C and S on the Au surface is much reduced.

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Gold-nanoparticle Inks for Room-temperature Formation of Conductive Films

Cited by 4 publications

References 34 publications

A new approach for additive-free room temperature sintering of conductive patterns using polymer-stabilized Sn nanoparticles

A new approach for additive-free room temperature sintering of conductive patterns using polymer-stabilized Sn nanoparticles

Nanostructure Tuning of Gold Nanoparticles Films via Click Sintering

On the Coalescence of Nanoparticulate Gold Sinter Ink

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