Overview
Low-temperature sintering nano silver paste is an advanced conductive adhesive composed of silver nanoparticles (typically 20-100 nm) suspended in an organic carrier. Unlike conventional silver pastes requiring high-temperature firing (>400°C), it sinters at 150-250°C, enabling use with heat-sensitive substrates like polymers and low-melting-point alloys. Developed for modern electronics miniaturization, it bridges the gap between epoxy adhesives (low conductivity) and high-temperature solders. The nano-scale particles exhibit surface plasmon resonance, lowering the sintering threshold while maintaining bulk silver's electrical (≥65% IACS) and thermal (≥200 W/m·K) properties post-curing.
Physical and Chemical Properties
The paste's viscosity ranges from 20,000-100,000 cP (adjustable for screen-printing or dispensing), with silver content typically 70-90% by weight. Nanoparticles are stabilized by surfactants to prevent agglomeration, ensuring uniform sintering. After solvent evaporation, the silver network achieves 80-90% theoretical density at low temperatures via atomic diffusion and grain growth. Key advantages include coefficient of thermal expansion (CTE) tunability (25-30 ppm/°C) to match semiconductor materials, and mechanical strength (20-50 MPa shear strength). Degradation occurs above 300°C in oxidizing environments, limiting high-temperature applications.
Main Applications
1) Power Electronics: Die-attach for SiC/GaN devices where high thermal conductivity (>200 W/m·K) and electromigration resistance are critical. Replaces lead-free solders in EV inverters and industrial motor drives. 2) LED Packaging: Bonding chips to ceramic substrates (e.g., Al₂O₃, AlN) in high-power LED modules, reducing thermal resistance by 30% compared to epoxy adhesives. 3) Flexible Hybrid Electronics (FHE): Printed interconnects on PI/PET films for wearable sensors, maintaining conductivity after 100k bending cycles. Emerging uses include 5G antenna arrays and photovoltaic cell metallization.
Safety and Storage
The paste contains volatile organic solvents (e.g., terpenes, glycol ethers) requiring handling in ventilated areas with nitrile gloves and goggles. Silver nanoparticles may pose inhalation risks during aerosolization—use local exhaust ventilation for dispensing. Unopened containers have a 6-12 month shelf life at 5-25°C. Freezing must be avoided to prevent solvent separation. Post-opening, use within 3 months and reseal tightly. Dispose as hazardous waste per local regulations due to silver and VOC content.
B2B Procurement Guide
For industrial procurement, prioritize suppliers with ISO 9001 certification and batch-to-batch consistency reports. Key specifications to verify: - Particle size distribution (D50 <50 nm preferred for low sintering temp) - Resistivity (<5×10⁻⁵ Ω·cm after sintering at 200°C) - Shelf life and storage requirements - Compatibility with intended deposition method (stencil printing, jetting, etc.) Bulk orders (50+ kg) commonly receive 15-20% discounts. Sample testing under actual production conditions (e.g., reflow profile) is strongly advised before large purchases.
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