Extraction of Backscattering and Absorption Coefficients of Magnetite Nanosphere Composites from Light-Scattering Measurements: Implications for Optomagnetic Sensing

Junxin Wang,Gunnar A. Niklasson,Yuanyuan Han,Hui Xiong,Mattias Strömberg,Annica M. Nilsson,Tomas Edvinsson,Changgang Xu

doi:10.1021/acsanm.0c02309

Abstract

Interaction of light with magnetic nanoparticles, dispersed in solution or embedded in other materials, is of major interest in a range of applications, one example being optomagnetic sensors. In a...

Highlights

The physical properties of magnetic colloidal nanoparticles are of interest for a number of innovative applications.[1,2] Novel synthesis, self-assembly, and functionalization methods have led to advances, for example, in the biomedical field.[3,4] In particular, the possibility to detect variations in optical properties due to an external magnetic field has attracted considerable interest.[5]
Magnetic nanoparticles dispersed in a surrounding medium exhibit unique optical performance in, for example, optical capacitors,[6] volumetric particle receivers and reactors for photothermal and thermochemical processes,[7,8] direct absorption solar collectors,[9] and magnetically induced formation of photonic nanostructures.[10−13] In the field of biomedical applications, iron-oxide particles are of special interest since they can be controlled by external magnetic fields, are biocompatible, have a large surface-to-volume ratio, and can be modified by functional biomolecules on the surface.[14,15]
Figure 1. (a−c) Scanning electron microscope (SEM) images with zoom-in images of single particles. (d−f) Size distributions of synthesized Fe3O4 nanoparticles with diameters of 89 ± 19 nm (NS89), 205 ± 27 nm (NS205), and 458 ± 137 nm (NS458). (g) X-ray diffraction (XRD) patterns of the three Fe3O4 samples with the patterns indexed with reference to fcc magnetite (JCPDS card 75-1609)

Summary

Introduction

The physical properties of magnetic colloidal nanoparticles are of interest for a number of innovative applications.[1,2] Novel synthesis, self-assembly, and functionalization methods have led to advances, for example, in the biomedical field.[3,4] In particular, the possibility to detect variations in optical properties due to an external magnetic field has attracted considerable interest.[5]. Analyte molecules are able to bind to the particles, thereby increasing the tendency for chain or cluster formation and producing a measurable optical signal

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Conclusion