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
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Inspect source passages
Stirring time sets GSH-capped silver nanoparticle size
These passages occur verbatim in the stored paper text. They support the points listed below; they do not verify every statement in the explanation.
TEM mean diameters were 3.20, 4.83 and 6.19 nm at 36, 48 and 72 h.
The TEM images showed that the Ag-NPs were in spherical shape and the average diameters of the particles were 3.20, 4.83 and 6.19 nm for the stirring times of 36, 48 and 72 h, respectively.
SPR bands of the Ag nanoparticles appeared at 344–354 nm.
The formation of Ag-NPs was confirmed in the UV-visible absorption spectra, which showed the SPR band characteristics of Ag-NPs in the range of 344–354 nm.
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.
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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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