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Transition-Metal-Doped NIR-Emitting Silicon Nanocrystals.

ABSTRACT: Impurity-doping in nanocrystals significantly affects their electronic properties and diversifies their applications. Herein, we report the synthesis of transition metal (Mn, Ni, Co, Cu)-doped oleophilic silicon nanocrystals (SiNCs) through hydrolysis/polymerization of triethoxysilane with acidic aqueous metal salt solutions, followed by thermal disproportionation of the resulting gel into a doped-Si/SiO₂ composite that, upon HF etching and hydrosilylation with 1-n-octadecene, produces free-standing octadecyl-capped doped SiNCs (diameter≈3 to 8 nm; dopant <0.2 atom %). Metal-doping triggers a red-shift of the SiNC photoluminescence (PL) of up to 270 nm, while maintaining high PL quantum yield (26 % for Co doping).

SUBMITTER: Chandra S

PROVIDER: S-EPMC5484998 | biostudies-literature | 2017 May

REPOSITORIES: biostudies-literature

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Transition-Metal-Doped NIR-Emitting Silicon Nanocrystals.

Chandra Sourov S Masuda Yoshitake Y Shirahata Naoto N Winnik Françoise M FM

Angewandte Chemie (International ed. in English) 20170404 22

Impurity-doping in nanocrystals significantly affects their electronic properties and diversifies their applications. Herein, we report the synthesis of transition metal (Mn, Ni, Co, Cu)-doped oleophilic silicon nanocrystals (SiNCs) through hydrolysis/polymerization of triethoxysilane with acidic aqueous metal salt solutions, followed by thermal disproportionation of the resulting gel into a doped-Si/SiO<sub>2</sub> composite that, upon HF etching and hydrosilylation with 1-n-octadecene, produce ...[more]

PMID: 28374522

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Project description:Highlights • The main properties of coordinated magnetic nanoparticles (MNPs) including magnetic moment and saturated magnetisation).• The doping of transition metal ions into ferrite to precisely modulate its magnetic properties.• the potential mechanisms and recent advances in transition metal ion-doped MNPs (TMNPs) for bioimaging: magnetic resonance imaging and magnetic particle imaging and tumour therapy: e.g., magneto-mechanical killing, magnetothermal therapy, and drug delivery.• the current challenges and future trends of TMNPs in the biomedical field based on the latest advances by researchers. Magnetic nanoparticles (MNPs) have been extensively researched and implemented in biomedicine for more than half a century due to their non-invasive nature, ease of temporal and spatial manipulation, and considerable biocompatibility. However, the complex magnetic behaviour of MNPs is influenced by several parameters (e.g., particle size, shape, composition, core-shell structure, etc.), among which the amount of transition metal doping plays an important factor. For this reason, the doping of ferrite with transition metals has been used as an effective strategy to precisely tailor MNPs to achieve satisfactory performance in biomedical applications. In this review, we first introduced the main properties of coordinated MNPs (including magnetic moment and saturated magnetisation) and provide a comprehensive overview of the mechanistic studies related to the doping of transition metal ions into ferrite to precisely modulate its magnetic properties. We also highlighted the potential mechanisms and recent advances in transition metal ion-doped MNPs (TMNPs) for bioimaging (magnetic resonance imaging and magnetic particle imaging) and tumour therapy (e.g., magneto-mechanical killing, magnetothermal therapy, and drug delivery). Finally, we summarised the current challenges and future trends of TMNPs in the biomedical field based on the latest advances by researchers. Graphical abstract Image, graphical abstractTransition metal doped magnetic nanoparticles (TMNPs) for biomedical applications

Dataset Information

Transition-Metal-Doped NIR-Emitting Silicon Nanocrystals.

Publications

Transition-Metal-Doped NIR-Emitting Silicon Nanocrystals.

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