Abstract
Fifth generation ethylendiamine-core poly(amidoamine) (PAMAM G5) is presented as an efficient capping agent for the preparation of metal and semiconductor nanoparticles by ps laser ablation in water. In particular, we describe results obtained with the fundamental, second and third harmonic of a ps Nd:YAG laser and the influence of laser wavelength and pulse energy on gold particle production and subsequent photofragmentation. In this framework, the role of the dendrimer and, in particular, its interactions with gold clusters and cations are accounted.
Highlights
Dendrimers are monodisperse polymers characterized by a well defined structure that resembles a tree, a multifunctional surface and internal cavities [1]
We investigate the role of PAMAM dendrimers of generation 5 on the stabilization of metal (Au and Ag) or semiconductor (CdSe) nanoparticles (NPs) obtained by ps laser ablation of a target in water solutions
It is dedicated to extensive report of the results, which we have recently obtained on the preparation and characterization of PAMAM G5-capped AuNPs: i) We discuss the role of laser wavelength and energy per pulse in the ablation of the gold target; ii) we show that it is possible to control the size of the NPs by irradiating pre-formed NPs suspensions with green or UV laser pulses, thanks to the onset of photofragmentation and iii) we study the fluorescence of different NPs suspensions in order to evidence the contribution of Au quantum dots to their emission
Summary
Dendrimers are monodisperse polymers characterized by a well defined structure that resembles a tree, a multifunctional surface and internal cavities [1]. Dendrimers can be used to improve many industrial processes, while the combination of high surface area and high solubility makes them useful as nanoscale catalysts [12,13] Thanks to their multifunctional surface, dendrimers can be self assembled onto differently functionalized surfaces to obtain regular arrays and to control the spacing of interior guest molecules [14]. We show how the methods developed for preparation of PAMAM G5-capped AuNPs and the potentialities of the dendrimer as a particle stabilizer can be transferred to other systems For this purpose, we illustrate preliminary experimental results, which we have very recently obtained in the case of laser ablation of Ag or CdSe targets in PAMAM G5/water solutions
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
