Stirring time sets GSH-capped silver nanoparticle size

Glutathione reduces AgNO3 at 60 °C; longer stirring grows spherical Ag nanoparticles from about 3 to 6 nm.

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What green reductant/stabilizer was used?

Glutathione (GSH) at 60 °C.

At what stirring times were nanoparticles observed?

After 36, 48 and 72 h, with mean size still under 7 nm.

Where is the Ag SPR band?

Around 344–354 nm.

What crystal structure did XRD show?

Face-centered cubic silver.

What TEM diameters correspond to 36/48/72 h?

3.20 ± 0.71, 4.83 ± 1.15 and 6.19 ± 1.59 nm.

Which GSH IR bands vanish on Ag binding?

S–H and N–H stretches at 2510, 3331 and 3234 cm−1.

When are absorbance peaks absent?

At 1, 3, 6 and 18 h in GSH substrate.

What happens to SPR intensity with longer stirring?

It increases gradually until 72 h.

What Scherrer sizes were estimated?

About 3–8 nm at 36, 48 and 72 h, matching TEM.

What Ag precursor concentration was used?

0.1 M AgNO3, 50 mL, stirred up to 72 h at 60 °C.

Why were reductions kept in the dark?

To avoid photochemical side reactions.