TY - JOUR

T1 - Temperature-Sensitive Localized Surface Plasmon Resonance of α-NiS Nanoparticles

AU - Himstedt, Rasmus

AU - Baabe, Dirk

AU - Wesemann, Christoph

AU - Bessel, Patrick

AU - Hinrichs, Dominik

AU - Schlosser, Anja

AU - Bigall, Nadja C.

AU - Dorfs, Dirk

N1 - Funding Information: D.D. and N.C.B. are thankful for funding by the German Research Foundation (DFG Research Grants DO 1580/5-1 and BI 1708/4-1, respectively). D.D. and N.C.B. also acknowledge financial support by the DFG under Germany’s Excellence Strategy within the Cluster of Excellence PhoenixD (EXC 2122, Project ID 390833453). R.H., P.B., and A.S. are grateful for being funded by the Hannover School for Nanotechnology (HSN). D.B. thanks Martin Bröring (Institut für Anorganische und Analytische Chemie at TU Braunschweig) for providing the SQUID magnetometer. N.C.B and A.S. furthermore received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 Research and Innovation Program (Grant Agreement No. 714429). The authors would also like to thank Tim Göpfert and Max Niemeyer for preliminary work leading up to this study and Armin Feldhoff as well as Jürgen Caro for the possibility to use the XRD.

PY - 2021/12/9

Y1 - 2021/12/9

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=85120378115&partnerID=8YFLogxK

U2 - 10.1021/acs.jpcc.1c08412

DO - 10.1021/acs.jpcc.1c08412

M3 - Article

VL - 125

SP - 26635

EP - 26644

JO - The Journal of Physical Chemistry C

JF - The Journal of Physical Chemistry C

SN - 1932-7455

IS - 48

ER -