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

authored by
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.

Organisation(s)
Section Catalysis and Membranes
Institute of Physical Chemistry and Electrochemistry
Section Functional nanostructures from assembled colloidal nanoparticles
PhoenixD: Photonics, Optics, and Engineering - Innovation Across Disciplines
External Organisation(s)
Technische Universität Braunschweig
Type
Article
Journal
The Journal of Physical Chemistry C
Volume
125
Pages
26635-26644
No. of pages
10
Publication date
09.12.2021
Publication status
Published
Peer reviewed
Yes
ASJC Scopus subject areas
Electronic, Optical and Magnetic Materials, Energy(all), Physical and Theoretical Chemistry, Surfaces, Coatings and Films
Electronic version(s)
https://doi.org/10.1021/acs.jpcc.1c08412 (Access: Open)