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.
Source
Stirring time effect of silver nanoparticles prepared in glutathione mediated by green method
Study at a glance
- Design
- Other — Time-dependent glutathione-capped AgNP growth tracked by SPR/TEM/XRD
- N
- Nanomaterial synthesis kinetics — no sample N
- Population
- Silver nanoparticles prepared with glutathione at 60 °C
- Outcome
- Stirring-time dependence of particle diameter and SPR
Structured fields used in claim comparison tables when every cited study has a complete layer.
What they did
Authors stirred AgNO3 with glutathione at 60 °C for 1–72 h and tracked SPR, XRD, TEM/SEM-EDX, FT-IR and zeta potential.
What they found
SPR at 344–354 nm appears after long stirring; fcc Ag forms; TEM diameters are 3.20, 4.83 and 6.19 nm at 36, 48 and 72 h. FT-IR shows GSH S–H/N–H bands vanish on binding.
The limits
What it doesn't show
No kinetic rate law or nucleation model; biological tests are only proposed; size dispersity still grows with time.
Key terms
- Surface plasmon resonance (SPR)
- Collective electron oscillation that gives Ag nanoparticles a characteristic UV-vis band.
- Glutathione (GSH)
- Tripeptide used here as both reductant and polymeric stabilizer.
- Face-centered cubic (fcc)
- Crystal packing of metallic silver confirmed by XRD.
- Scherrer equation
- Relates XRD peak width to mean crystallite size.
- Zeta potential
- Electrophoretic measure of colloid surface charge and stability.
Flashcards
Research intelligence for this paper
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Quiz yourself
GSH’s roles here:
Common questions
What temperature was used?
60 °C in the dark.
When do SPR bands appear?
Around 344–354 nm after long stirring (not at 1–18 h).
How does size change with time?
Mean TEM diameter rises from 3.20 nm (36 h) to 6.19 nm (72 h).
What FT-IR change marks binding?
GSH S–H and N–H stretches disappear in [Ag(GSH)].
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