The conduction development mechanism of silicone-based electrically conductive adhesives

Li, Zhuo; Hansen, Kristen; Yao, Yagang; Ma, Yanqing; Moon, Kyoung‐Sik; Wong, Ching‐Ping

doi:10.1039/c3tc30612g

Cited by 34 publications

(29 citation statements)

References 33 publications

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“…6a. 47,48 After TPTA treatment, and TPTA and I 2 treatment, a clear decrease in the intensity of the C-H, COO À , and C-COO À groups can be seen, similar to the IR results, which suggests that the modifying agents can partially remove the surfactants on the Ag-coated-Cu flake surfaces. The bands at 2800-2900 cm À1 are ascribed to C-H stretching of -CH 2 -.…”

Section: Resultssupporting

confidence: 62%

Electrical property enhancement of electrically conductive adhesives through Ag-coated-Cu surface treatment by terephthalaldehyde and iodine

Gong

Tang

et al. 2015

J. Mater. Chem. C

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One of the largest obstacles for Ag based electrically conductive adhesives (ECAs), as an alternative for Pb-containing solders in electronic packaging, is that the conductivity of ECAs is lower than that of solders due to the limited physical contact area between/among conductive fillers and the insulated organic lubricant and metal oxide layers on the surface of the conductive fillers. What's more, the high cost of Ag fillers is also restricting the wide use of Ag based ECAs. In this study, Ag-coated-Cu flakes were chosen as a substitute for Ag flakes to reduce the cost. At the same time, the coating of Cu with an Ag layer could protect the Cu-based fillers from oxidation and corrosion. A mixture of weak reducing agents and substituting agents was selected to treat the Ag-coated-Cu flakes to increase the conductivity of the Ag-coated-Cu based ECAs. During the treatment process, the weak reducing agents can reduce the metal oxides on the filler surfaces, enabling more metallic contacts. Meanwhile, the substituting agents can partially remove or replace the long chain fatty acid lubricants on the metal flakes, improving the electron tunneling between/among neighboring flakes. As such, the multiple effects of the reducing agents and substituting agents can improve the conductivity of the ECAs. By using an appropriate amount of terephthalaldehyde and iodine treated Ag-coated-Cu flakes, the resistivity was reduced to as low as 1.28 Â 10 À4 O cm for the ECA with 75 wt% content of treated fillers, which is comparable to that of commercially available Ag-filled ECAs (Â10 À4 O cm). This work suggests that a surface chemical method can enhance the electrical conductivity of metal filler based ECAs.

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Section: Resultssupporting

confidence: 62%

Electrical property enhancement of electrically conductive adhesives through Ag-coated-Cu surface treatment by terephthalaldehyde and iodine

Gong

Tang

et al. 2015

J. Mater. Chem. C

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“…Therefore, reducing agents were added to ECAs to chemically reduce the lubricant to nano/submicron-sized silver particles and these in situ formed nano/submicron-sized particles may then facilitate the sintering of the silver flakes during curing [21]. As a result, the high molecular weight of long-chain H-PDMS not only provides a high elasticity due to the low cross-linking density of the formed silicone matrix , but also enhance the electrical conductivity via the generation and sintering of silver nanoparticles [22].…”

Section: The Stretchable High Conductive Ecasmentioning

confidence: 97%

A novel strain sensor based on 3D printing technology and 3D antenna design

Le¹,

Song

Liu³

et al. 2015

2015 IEEE 65th Electronic Components and Technology Conference (ECTC)

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The additive manufacturing technique of 3D printing has become increasingly popular for time-consuming and complex designs. Due to the special mechanical properties of commercial NinjaFlex filament [1] and in-house-made electrically conductive adhesives (ECAs) [2], there is great potential for the 3D printed RF applications, such as strain sensors and flexible, wearable RF devices. This paper presents the flexible 3D printed strain sensor, as a 3D dipole antenna of ECA stretchable conductor on 3D printed Ninjaflex filament .

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“…The details of the formulation of PDMS-ECA are described in our other publication [17]. Briefly, the PDMS resin was degassed in a vacuum pump for 6 hours before mixing with silver fillers and catalyst.…”

Section: Methodsmentioning

confidence: 99%

Shape engineering of the fillers in stretchable, electrically conductive adhesives: Its effect on percolation and conductivity change during stretching

Hansen

Moon

et al. 2013

2013 IEEE 63rd Electronic Components and Technology Conference

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The effects of different shapes of silver; particles, flakes and dendrites on the electrical property of polydimethyl siloxane (PDMS)-based electrically conductive adhesives (ECA) under mechanical deformation are investigated. It is found that the high aspect ratio of silver dendrites helps to construct more conduction pathways in the ECAs compared with silver particles and flakes, therefore reducing the percolation threshold. Stretching made the bulk resistivity of spherical silver filled ECA increase exponentially, which is in good agreement with the classical piezoresistive models. On contrast, the resistivity of silver flakes filled ECAs did not change within 100% strain and up to 500 cycles of stretching/releasing tests. For silver dendrites, the resistivity decreased when stretching and increased slightly afterwards, resulting in an almost invariant value within 60% elongation. However, removing the external strain did not havethe resistance value recover back to the original level. IntroductionModern consumer electronics are striving for increased functionality and reduced form factor. Stretchable radiofrequency (RF) electronics are gaining popularity as a result of their increased functionality, impossible within the confines of rigid, planar substrates. However, the field of stretchable RF electronics is still in its infancy. Similarly to other emerging electronic technologies, new materials and new processing methods are the two driving forces for the development of stretchable RF electronics.There are currently two general approaches to the fabrication of stretchable RF electronics. The first one utilizes conventional rigid materials (such as silicon), but elegantly designed wavy or arc-shaped structures are capable of accommodating applied strains of 100% or more [1][2][3][4][5][6][7]. The second approach is to maintain the conventional layout, but embed stretchable or flowable conductive materials into a sheath, including conductive polymers [8,9], conductive polymer composites [10-12] and liquid metal alloys [13,14] as stretchable conduction lines.For RF electronics, the second approach is usually preferred because of the simplicity in circuit design and fabrication. However, this approach imposes stringent requirements for the conductive materials. These requirements include the following: 1) The material must have a very high electrical conductivity to achieve high-efficiency RF devices. 0[9]; 2) The material needs to be highly elastic for tunable resonant frequency [14] and still maintain a similar electrical conductivity. By stretching the antenna, the length is increased, leading to a decrease in resonant frequency. To gain a wide window of tunable resonant frequency, both the

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The conduction development mechanism of silicone-based electrically conductive adhesives

Cited by 34 publications

References 33 publications

Electrical property enhancement of electrically conductive adhesives through Ag-coated-Cu surface treatment by terephthalaldehyde and iodine

Electrical property enhancement of electrically conductive adhesives through Ag-coated-Cu surface treatment by terephthalaldehyde and iodine

A novel strain sensor based on 3D printing technology and 3D antenna design

Shape engineering of the fillers in stretchable, electrically conductive adhesives: Its effect on percolation and conductivity change during stretching

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