https://doi.org/10.1140/epjb/e2004-00291-9
On-line monitoring of Au nanoparticles formation by optical spectroscopy
1
Istituto per I Materiali Compositi e Biomedici – Consiglio Nazionale delle
Ricerche, Piazzale Tecchio 80, 80125 Naples, Italy
2
Istituto di Cibernetica – Consiglio Nazionale delle Ricerche “ E Caianiello”, Via Campi Flegrei 34, 80078-Pozzuoli, Italy
3
Coherentia INFM – Università di Napoli “Federico II” – Dipartimento
Scienze Fisiche, Fac. Ingegneria, P.le Tecchio 80, 80125 Napoli, Italy
Corresponding author: a gpepe@na.infn.it
Received:
7
April
2004
Revised:
13
July
2004
Published online:
30
September
2004
Experimental results concerning the synthesis of gold nanoparticles prepared by alcoholic reduction of Au(III) ions in presence of a polymeric stabilizer, and UV-visible spectroscopic characterization is presented. Optical spectroscopic data have been correlated to off-line size measurements obtained analysing transmission electron micrographs. The gold cluster size, coming from both TEM micrographs and absorbance cubic root, behaved linearly with time above a threshold temperature (70 °C) according to a deposition-controlled growth mechanism. The plasmon peak halfwidth behaved linearly with inverse particle radius (obtained by TEM), thus proving the hypothesized mechanism growth. The spectroscopic approach allows an on-line gold cluster measurement with possibility to fine control particle size also in the case of a fast process.
PACS: 73.20.Mf – Collective excitations (including excitons, polarons, plasmons and other charge-density excitations) / 78.67.Bf – Nanocrystals and nanoparticles
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2004