Photoacoustics for listening to metal nanoparticle super-aggregates.

Autor:	Li Voti R; Department of Basic and Applied Sciences for Engineering (SBAI), Sapienza University of Rome Via A. Scarpa 14 00161 Rome Italy roberto.livoti@uniroma1.it., Leahu G; Department of Basic and Applied Sciences for Engineering (SBAI), Sapienza University of Rome Via A. Scarpa 14 00161 Rome Italy roberto.livoti@uniroma1.it., Sibilia C; Department of Basic and Applied Sciences for Engineering (SBAI), Sapienza University of Rome Via A. Scarpa 14 00161 Rome Italy roberto.livoti@uniroma1.it., Matassa R; Department of Anatomical, Histological, Forensic and Orthopedic Sciences, Section of Human Anatomy, Sapienza University of Rome Via A. Borelli 50 00161 Rome Italy roberto.matassa@uniroma1.it., Familiari G; Department of Anatomical, Histological, Forensic and Orthopedic Sciences, Section of Human Anatomy, Sapienza University of Rome Via A. Borelli 50 00161 Rome Italy roberto.matassa@uniroma1.it., Cerra S; Department of Chemistry, Sapienza University of Rome P.le A. Moro 5 00185 Rome Italy Ilaria.fratoddi@uniroma1.it., Salamone TA; Department of Chemistry, Sapienza University of Rome P.le A. Moro 5 00185 Rome Italy Ilaria.fratoddi@uniroma1.it., Fratoddi I; Department of Chemistry, Sapienza University of Rome P.le A. Moro 5 00185 Rome Italy Ilaria.fratoddi@uniroma1.it.
Jazyk:	angličtina
Zdroj:	Nanoscale advances [Nanoscale Adv] 2021 Jun 18; Vol. 3 (16), pp. 4692-4701. Date of Electronic Publication: 2021 Jun 18 (Print Publication: 2021).
DOI:	10.1039/d1na00333j
Abstrakt:	Photoacoustic signal detection has been used to build a new strategy to determine the mesoscale self-assembly of metal nanoparticles in terms of size distribution and aggregate packing density (metal nanoparticle filling factor). A synergistic approach integrating photoacoustic signal and theoretical studies, validated by conventional light scattering and electron microscopy techniques, allows us to obtain a well-defined morphological interpretation of nanoparticle-based super-aggregates. By pumping light in a complex system, the acousto-thermal effect was listened to, providing information on the aggregation phenomena. Super-aggregates of covalently interconnected silver nanoparticles (AgNPs) functionalized with an organometallic dithiol are identified in solution, as a proof of concept for the versatility of the photoacoustic approach. According to our results, tiny AgNPs (size less than 10 nm) assembled into a 3D-network of super-aggregates (SA-AgNPs) with sizes in the range 100-200 nm and a filling factor in the range of 30-50%. Low-cost, rapid, and easy photoacoustic measurement in the low frequency range (less than 100 Hz) was revealed to be an innovative method to characterize the fundamental structure/property correlation of metal nanoparticle super-aggregates. This morpho-optical approach, which uses the absorption and scattering properties of nanoparticles in the liquid phase, opens new perspectives for advanced biomedical and structural applications. Competing Interests: The authors declare no conflict of interest. (This journal is © The Royal Society of Chemistry.)
Databáze:	MEDLINE
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