Effects of Solvent Type on Low-Temperature Sintering of Silver Oxide Paste to Form Electrically Conductive Silver Film

Abstract

Silver oxide pastes were formulated from silver oxide powder, silver a-neodecanoate, and solvents, which lowers the sintering temperature of printed silver films to 150°C. In this paper, solvent effects were investigated through the formulation of silver oxide pastes using various solvents with high boiling points such as glycol, ether, and terpineol. Solvent structures such as terminal methyl and alkoxyl groups affected the solubility of silver a-neodecanoate and the swelling of the polydimethylsiloxane (PDMS) blanket. Particularly, higher solubility induced uniform mixing of the silver oxide powder and silver a-neodecanoate, which resulted in higher conductivity after sintering. Glycols and monoalkyl ethers reacted with the silver oxide or silver salt, which deteriorated the pot life of the paste. Among the various candidates, a-terpineol satisfied all the requirements such as printability and stability, exhibiting a solubility of 47.8 g in 100 g of solvent, PDMS swelling of 4.6%, and conductivity of 1.8 9 10 5 S/cm after sintering at 150°C for 30 min.

Crack-Enhanced Microfluidic Stretchable E-Skin Sensor

“…Five different sensing liquids (water, dimethyl sulfoxide (DMSO), ethylene glycol (EG), propylene carbonate (PC), and terpineol) were injected into the channels using a syringe connected to a liquid reservoir (Figure d). Liquids that did not induce swelling or other damage to the PDMS were selected as sensing liquids , (Table S1). Figures e and S2 illustrate the proposed sensing mechanism of the microfluidic capacitive sensor enabled by microcracks formed on the channel surfaces.…”

Formulation and Characterization of CuIn1-xGaxSe2 Ink for Gravure Offset Printing

“…Gravure offset ink usually shows a shear thinning property with a high viscosity ranging from 1000 to 100,000 mPaÁs. 6,18,19) In particle suspension, shear thinning behavior is closely related to hydrodynamic interactions between particles, and therefore depends on particle concentration. 20) On the other hand, particle interaction can be controlled by polymer additives and surfactants at the same particle concentration.…”

Stamping Transfer of a Quantum Dot Interlayer for Organic Photovoltaic Cells

“…A method to transfer the QD layer onto the active layer without damaging the latter was thus designed. Although the organic layer transfer has been implemented using a PDMS mold, the PDMS can also be damaged by organic solvent during the spin-coating process, thereby impeding the formation of uniform film thickness …”

“…Although the organic layer transfer has been implemented using a PDMS mold, the PDMS can also be damaged by organic solvent during the spincoating process, thereby impeding the formation of uniform film thickness. 32 The QD layer was therefore transferred by using PUA in order to produce a QD interlayer in the form of a monolayer on top of the active layer.…”