Preparation of Micro-Size Spherical Silver Particles and Their Application in Conductive Silver Paste

Abstract

In this paper, micro-size spherical silver particles were prepared by using a wet-chemical reduction method. The silver particles were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and a laser particle-size analyzer. The results indicate that different types and the content of surfactants can be used to prevent the accumulation, and control the morphology and particle size distribution, of silver particles. Moreover, the morphology of silver particles was changed from polyhedral to spherical when the pH was raised from 1 to 3. Under the optimal synthesis conditions (0.1 mol/L silver nitrate, 0.06 mol/L ascorbic acid, gelatin (5% by weight of silver nitrate), pH = 1), the micro-size spherical silver particles with diameter of 5–8 μm were obtained. In addition, the resistivity of conductive silver paste that prepared with the as-synthesized spherical silver particles was discussed in detail and the average resistivity of the conductive silver paste was 3.57 × 10−5 Ω·cm after sintering at 140 °C for 30 min.

Polymer Conductive Paste Formulation by Modified Ag2O Particles

“…However, no previous research has investigated the modification of Ag2O particles for their use in producing polymer paste for flexible electronics without reducing them into Ag. Modifying particles is essential, as it allows the adjustment of their electrical conductivity by controlling their size, morphology, and particle distribution [16]. Changing the size of Ag2O particles could potentially increase their reactivity [17], enabling the reduction of Ag2O particles to Ag at lower processing temperatures while achieving comparable electrical conductivity results.…”

Electrical and water resistance properties of conductive paste based on gold/silver composites

“…These advancements have led to their widespread use in applications. Conductive silver paste offers several advantages, including excellent electrical conductivity, good adhesion to various substrates, low resistance, and high thermal conductivity [16,17]. However, conductive silver paste has some disadvantages; silver can oxidize over time, especially when exposed to air, moisture, or certain environmental conditions.…”

“…(1) The metal powder or other conductive powder is the conductive component of the paste and provides electrical conductivity. Commonly used metals in conductive pastes include silver, gold, copper, nickel, and aluminum [17][18][19]. Additionally, graphite powder is another conductive material that is often used in combination with metals or as a standalone conductive component in conductive pastes.…”

“…Additionally, graphite powder is another conductive material that is often used in combination with metals or as a standalone conductive component in conductive pastes. These powder particles are typically micro-or nano-scale in size to enhance conductivity and allow for better adhesion to substrates [6,16,17,20,21]. (2) The polymer adhesive serves as a binder that holds the metal powder particles together and facilitates their adhesion to the substrate.…”

Recovery of Non-Ferrous Metal from Metallurgical Residues

“…Using a microjet reactor, the two reaction solutions collide and combine outside the reactor, thereby avoiding microchannel obstruction issues and facilitating a quicker and more convenient synthesis process. The resistivity of conductive silver paste prepared with the as-synthesized spherical silver particles was also discussed in detail [8]. Orda et al contribute to the technique development of purification commercial rhenium salts [9].…”