Nature of magnetism in thiol-capped gold nanoparticles investigated with Muon spin rotation

Abstract

Detection of ultra-low oxygen concentration based on the fluorescence blinking dynamics of single molecules

Influence of size and surface capping on photoluminescence and cytotoxicity of gold nanoparticles

“…Many other authors have reported on gold NPs prepared by reduction in the presence of a capping ligand that directly biofunctionalize the NP or facilitate its subsequent biofunctionalization (Fratoddi 2018 ), controlling the particle growth. This route also allows for the use of thiols as capping agents, due to the high affinity of this group for the gold surface (Brust et al 1994 ; Dehn et al 2018 ).…”

Density Functional Theory Studies of the Electronic Structure and Muon Hyperfine Interaction in [Au25(SR)18]0 and [Au25(SeR)18]0 Nanoclusters

“… 21 Recently, more explicit evidence for magnetism was found using μSR measurement in butanethiol-capped gold nanoparticles with 2.2 nm in diameter. 2 Their results also indicated the presence of a broad range of internal magnetic fields at the muon stopping site, which is consistent with a spatially inhomogeneous distribution of magnetic moments.…”

“…It should be noted that both Goikolea et al and Dehn et al systems do not contain any phenyl ring in the ligand, but there are sulfur atoms that can provide multiple Mu trapping sites. 2 , 20 Thus, the large Mu Fermi contact field at sulfur sites is a factor that could explain the loss of initial asymmetry observed in the μSR spectra.…”

“…However, the magnetism of these materials is still unclear, as discussed by Agrachev et al 1 Contradictory results of various experimental and theoretical investigations could be due to different ligands that cap the gold nanoclusters. 2 Thiolate-passivated gold nanoclusters with icosahedral geometry Au 25 (SR) 18 have been extensively studied because of their high stability, intriguing properties, and ease of synthesis. 3 − 9 There are three possible charge states for the stable redox species of Au 25 (SR) 18 , that is, q = −1, 0, and +1.…”

Detail Synthesis Route of Free-Standing Antiferromagnetic La2CuO4 Nanoparticles via Sol-gel Method

“…Nano-sized effects have attracted great attention recently since it leads to the alter of physical and magnetic properties of a material. One of the interesting phenomena is the appearance of magnetism in nano-system such as nanogold and nano-CuO [1][2][3][4][5]. Clear evidence of magnetism was observed in gold nanoparticles encapsulated by butanethiol with Au-cluster size at 2.2 nm by muon-spin relaxation (μSR) [2].…”