Size-Dependent Threshold of the Laser-Induced Phase Transition of Colloidally Dispersed Copper Oxide Nanoparticles

verfasst von

Daniel Kranz, Patrick Bessel, Max Niemeyer, Hadir Borg, Marina Rosebrock, Rasmus Himstedt, Nadja C. Bigall, Dirk Dorfs

Abstract

Due to their unique optical properties, nanoparticles are well suited for heating by laser irradiation. In this context, colloidally dispersed particles are of particular interest because in conventional ways of heating, the maximum attainable temperature is limited by the boiling point of the solvent. With the right choice of the used laser wavelength, it is possible to selectively heat these particles above the melting point of the material whereas the surrounding and laser-transparent medium remains comparatively cold. This type of laser process is called laser melting in liquids (LML). To further investigate the possibilities of laser-induced heating processes, colloidally dispersed copper(II) oxide (CuO) nanoparticles were synthesized, dispersed in ethanol, and irradiated with a nanosecond-pulsed Nd:YAG laser. In this way, a laser-induced phase transition into the copper richer copper(I) oxide (Cu2O) phase and into elemental copper can be observed. The conversion process is followed by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), selected area electron diffraction (SAED), and UV-vis spectroscopy. It is shown that in the initial LML process a minimum particle size of 23-29 nm is required for a successful phase transition likely due to the size dependent heating efficiency, cooling effects, and the formation of nanobubbles.

Organisationseinheit(en)

Hannover School for Nanotechnology
AG Kolloidchemie von Metallen und Halbleitern, Spektroskopie an Nanopartikeln
Institut für Physikalische Chemie und Elektrochemie
PhoenixD: Simulation, Fabrikation und Anwendung optischer Systeme
AG Katalyse und Membranen

Typ

Artikel

Journal

The Journal of Physical Chemistry C

Band

126

Seiten

15263–15273

Anzahl der Seiten

11

Publikationsdatum

15.09.2022

Publikationsstatus

Veröffentlicht

Peer-reviewed

Ja

Elektronische Version(en)

https://doi.org/10.1021/acs.jpcc.2c03815 (Zugang: Geschlossen)