Morphology evolution of gold nanoparticles as function of time, temperature, and Au(III)/sodium ascorbate molar ratio
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In this work the morphology evolution of Au nanoparticles (AuNPs), obtained by direct reduction, was studied as a function of time, temperature, and Au(III)/sodium ascorbate molar ratio. The NPs morphology was examined by transmission electron microscope with image analysis, while time evolution was investigated by visible and near-infrared absorption spectroscopy and dynamic light scattering. It is found that initially formed star-like NPs transform in more spheroidal particles and the evolution appears more rapid by increasing the temperature while a large amount of reducing agent prevents the remodeling of AuNPs. An explication of morphology evolution is proposed.
KeywordsGold nanoparticles Star-like morphology Crystal growth Multi-twinned particles NPs nucleation NPs morphology evolution
The authors would like to thank all the students of “De Pretto” Technical Institute (Schio, Italy) who participated in this work by providing a valuable technical support.
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Conflict of interest
The authors declare that they have no potential conflict of interest.
- Astruc D (2008) Nanoparticles and catalysis. Wiley-VCH, GermanyGoogle Scholar
- Bohren CF, Huffman DR (1983) Absorption and scattering of light by small particles. Wiley-VCH, WeinheimGoogle Scholar
- Hayat MA (1991) Colloidal gold: principles, methods and applications. Academic Press, San DiegoGoogle Scholar
- Hofmeister H (2009) Shape variations and anisotropic growth of multiply twinned nanoparticles. Z Kristallogr 224:528–538Google Scholar
- Hornyak G, Moore JJ, Tibbals HF, Dutta J (2009) Fundamentals of nanotechnology. CRC Press, FloridaGoogle Scholar
- Richards V (2010) Nucleation control in size and dispersity in metallic nanoparticles: the prominent role of particle aggregation. Dissertation: Washington UniversityGoogle Scholar
- Sarid D, Challener WA (2009) Modern introduction to surface plasmons. Cambridge University Press, CambridgeGoogle Scholar
- Stathis EC, Fabrikanos A (1958) Preparation of colloidal gold. Chem Ind 27:860–861Google Scholar
- Van de Broek B, Grandjean D, Trekker J, Ye J, Verstreken K, Maes G, Borghs G, Nikitenko S, Lagae L, Bartic C, Temst K et al (2011) Temperature determination of resonantly excited plasmonic branched gold nanoparticles by X-ray absorption spectroscopy. Small 7:2498–2506Google Scholar
- Vlieger J, Bedeaux D (1985) A statistical theory for the dielectric properties of thin island films: application and comparison with experimental results. Thin Solid Films 102:265–281Google Scholar