Nanotech-Based Security Ink

GS III-Security

Context:

Indian scientists have developed a nanoparticle-based security ink to enhance anti-counterfeiting measures.

What is Security Printing?

Used to prevent forgery in critical documents like banknotes, passports, and cheques.
Features:

• Human-Detectable: Watermarks, holograms, optically variable ink.
• Machine-Detectable: RFID chips, digital watermarks, security threads.

Role of Nanoparticles in Security Printing

Nanoparticles (<100 nm): Have unique optical, magnetic, and chemical properties.

Significance:

• Reacts with light & magnetic fields, making it ideal for anti-counterfeiting.
• 2023 Nobel Prize in Chemistry awarded for semiconductor nanoparticle research, highlighting its global importance.

Development of the New Security Ink

Composition:

• Strontium bismuth fluoride (Sr₂BiF₇) nanoparticles doped with lanthanide ions.

Manufacturing Method:

• Made using a coprecipitation process involving metal salts & precipitation agents.
• Blended with PVC ink for enhanced binding & durability.

Unique Features:

• Fluorescence in UV & near-infrared light (glows in different colors).
• Stable across brightness, temperature & humidity changes.

Significance for India

• Strengthens Anti-Counterfeiting Measures: Helps secure currency, documents & IDs.
• Boosts Indigenous R&D: Reduces reliance on imported security features.
  Environmental Stability: Ensures long-lasting security in diverse conditions.

India’s nano-security ink innovation enhances document security while promoting self-reliance in advanced technology.