Temperature-Sensitive Localized Surface Plasmon Resonance of α-NiS Nanoparticles

verfasst von
Rasmus Himstedt, Dirk Baabe, Christoph Wesemann, Patrick Bessel, Dominik Hinrichs, Anja Schlosser, Nadja C. Bigall, Dirk Dorfs
Abstract

The presented work shows a synthesis route to obtain nanoparticles of the hexagonal α-NiS phase and core-shell particles where the same material is grown onto previously prepared Au seeds. In the bulk, this nickel sulfide phase is known to exhibit a metal-insulator type phase transition (MIT) at 265 K which drastically alters its electrical conductivity. Since the produced nanoparticles show a localized surface plasmon resonance (LSPR) in the visible range of the electromagnetic spectrum, the development of their optical properties depending on the temperature is investigated. This is the first time an LSPR of colloidal nanoparticles is monitored regarding such a transition. The results of UV-vis absorbance measurements show that the LSPR of the particles can be strongly and reversibly tuned by varying the temperature. It can be switched off by cooling the nanoparticles and switched on again by reheating them above the transition temperature. Additional to the phase transition, the temperature-dependent magnetic susceptibility of α-NiS and Au-NiS nanoparticles suggests the presence of different amounts of uncompensated magnetic moments in these compounds that possibly affect the optical properties and may cause the observed quantitative differences in the LSPR response of these materials.

Organisationseinheit(en)
AG Katalyse und Membranen
Institut für Physikalische Chemie und Elektrochemie
AG Funktionale Nanostrukturen aus assemblierten kolloidalen Nanopartikeln
PhoenixD: Simulation, Fabrikation und Anwendung optischer Systeme
Externe Organisation(en)
Technische Universität Braunschweig
Typ
Artikel
Journal
The Journal of Physical Chemistry C
Band
125
Seiten
26635-26644
Anzahl der Seiten
10
Publikationsdatum
09.12.2021
Publikationsstatus
Veröffentlicht
Peer-reviewed
Ja
ASJC Scopus Sachgebiete
Elektronische, optische und magnetische Materialien, Energie (insg.), Physikalische und Theoretische Chemie, Oberflächen, Beschichtungen und Folien
Elektronische Version(en)
https://doi.org/10.1021/acs.jpcc.1c08412 (Zugang: Offen)