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Ordered hierarchical superlattice amplifies coated-CeO2 nanoparticles luminescence

DOI: 10.1016/j.jcis.2024.01.029 DOI Help

Authors: Noemi Gallucci (University of Naples Federico II; CSGI, Center for Colloid and Surface Science) , Marie-Sousai Appavou (Forschungszentrum J├╝lich GmbH) , Nathan P. Cowieson (Diamond Light Source) , Gerardino D'Errico (University of Naples Federico II; CSGI, Center for Colloid and Surface Science) , Rocco Di Girolamo (University of Naples Federico II) , Stefano Lettieri (University of Naples Federico II) , Filomena Sica (University of Naples Federico II) , Giuseppe Vitiello (CSGI, Center for Colloid and Surface Science; University of Naples Federico II) , Luigi Paduano (University of Naples Federico II; CSGI, Center for Colloid and Surface Science)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Colloid And Interface Science , VOL 41

State: Published (Approved)
Published: April 2024

Open Access Open Access

Abstract: Achieving a controlled preparation of nanoparticle superstructures with spatially periodic arrangement, also called superlattices, is one of the most intriguing and open questions in soft matter science. The interest in such regular superlattices originates from the potentialities in tailoring the physicochemical properties of the individual constituent nanoparticles, eventually leading to emerging behaviors and/or functionalities that are not exhibited by the initial building blocks. Despite progress, it is currently difficult to obtain such ordered structures; the influence of parameters, such as size, softness, interaction potentials, and entropy, are neither fully understood yet and not sufficiently studied for 3D systems. In this work, we describe the synthesis and characterization of spatially ordered hierarchical structures of coated cerium oxide nanoparticles in water suspension prepared by a bottom-up approach. Covering the CeO2 surface with amphiphilic molecules having chains of appropriate length makes it possible to form ordered structures in which the particles occupy well-defined positions. In the present case superlattice arrangement is accompanied by an improvement in photoluminescence (PL) efficiency, as an increase in PL intensity of the superlattice structure of up to 400 % compared with that of randomly dispersed nanoparticles was observed. To the best of our knowledge, this is one of the first works in the literature in which the coexistence of 3D structures in solution, such as face-centered cubic (FCC) and Frank-Kasper (FK) phases, of semiconductor nanoparticles have been related to their optical properties.

Journal Keywords: Cerium oxide; Hierarchical organization; Frank-Kasper phase; Superlattice; Photoluminescence

Diamond Keywords: Semiconductors

Subject Areas: Materials, Chemistry

Instruments: B21-High Throughput SAXS

Added On: 15/01/2024 09:16


Discipline Tags:

Chemistry Materials Science Nanoscience/Nanotechnology

Technical Tags:

Scattering Small Angle X-ray Scattering (SAXS)