Resolving the source of blue luminescence from alkyl-capped silicon nanoparticles synthesized by laser pulse ablation

Dewan, Shalaka; Odhner, Johanan H.; Tibbetts, Katharine Moore; Afsari, Sepideh; Levis, Robert J.; Borguet, Eric

doi:10.1039/c6tc02283a

Cited by 10 publications

(3 citation statements)

References 51 publications

(71 reference statements)

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“…Various techniques, such as electrochemical reduction, plasma deposition of silane, wet-chemical synthesis, have been proposed for preparing colloidal Si-nc with alkyl termination. It should be noted that laser irradiation method in an organic solvent has some advantages (i.e., one-pot production and a concise preparation setup − ) in preparing alkyl-terminated colloidal Si-nc. However, this synthesis process makes difficult to control the sizes of the colloidal nanoparticles and its size distribution is known to be wider .…”

Section: Introductionmentioning

confidence: 99%

Improvement of Laser Processing for Colloidal Silicon Nanocrystal Formation in a Reactive Solvent

Nakamura

Adachi

et al. 2017

J. Phys. Chem. C

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We report the highly improvement of colloidal Si nanocrystal (Si-nc) formation by pulsed-UV-laser irradiation of porous silicon in a HF-contained organic solvent. The Si-nc in such reactive organic solvent exhibits higher photoluminescence quantum yield (∼50–70%) than that in an ordinary organic solvent without HF (∼20%). This enhancement of the quantum yield is caused by HF-induced removal of the surface oxidation layer and subsequent hydrogen termination of the Si surface. These reaction kinetics promote an efficient hydrosilylation between the hydrogen-terminated surface and an organic solvent, resulting in oxygen-free surface terminated by alkyl groups. Furthermore, the preparation yield in the HF-contained solvent is higher and the size distribution of Si-nc becomes more homogeneous than those in the ordinary solvent. These results can be attributed to efficient pulsed-laser-induced fragmentation by the removal of the oxidation layer on the porous Si target surface.

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Section: Introductionmentioning

confidence: 99%

Improvement of Laser Processing for Colloidal Silicon Nanocrystal Formation in a Reactive Solvent

Nakamura

Adachi

et al. 2017

J. Phys. Chem. C

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“…Nanodiamonds have been obtained through femtosecond irradiation of ethanol [ 164 – 165 ]. Fluorescent carbon dots were also observed as a by-product when synthesizing 1-octene-capped silicon nanoparticles by picosecond LAL [ 166 ], indicating that solid carbon products can form independently from solvent decomposition during LAL. Femtosecond LRL of copper and silver acetylacetonate in alcohol solvent was found to produce Cu and Cu–Ag alloy nanoparticles with carbon shells composed of disordered graphite oxide [ 37 , 167 ].…”

Section: Reviewmentioning

confidence: 99%

Laser synthesis of nanoparticles in organic solvents – products, reactions, and perspectives

Fromme,

Reichenberger,

Tibbetts

et al. 2024

Beilstein J. Nanotechnol.

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Laser synthesis and processing of colloids (LSPC) is an established method for producing functional and durable nanomaterials and catalysts in virtually any liquid of choice. While the redox reactions during laser synthesis in water are fairly well understood, the corresponding reactions in organic liquids remain elusive, particularly because of the much greater complexity of carbon chemistry. To this end, this article first reviews the knowledge base of chemical reactions during LSPC and then deduces identifiable reaction pathways and mechanisms. This review also includes findings that are specific to the LSPC method variants laser ablation (LAL), fragmentation (LFL), melting (LML), and reduction (LRL) in organic liquids. A particular focus will be set on permanent gases, liquid hydrocarbons, and solid, carbonaceous species generated, including the formation of doped, compounded, and encapsulated nanoparticles. It will be shown how the choice of solvent, synthesis method, and laser parameters influence the nanostructure formation as well as the amount and chain length of the generated polyyne by-products. Finally, theoretical approaches to address the mechanisms of organic liquid decomposition and carbon shell formation are highlighted and discussed regarding current challenges and future perspectives of LSPC using organic liquids instead of water.

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“…hydrocarbons, 40,52 and stable optical properties over a period of months were observed aer long-alkyl passivation. 33,44 Because Si is a bioinert, abundant, and cost-effective material, [59][60][61][62] colloidal SiNPs have been used to develop solar cells, 63 light emitters, 64 on-skin sensors, 65 and Li-ion batteries 66 via solution processes.…”

Section: Introductionmentioning

confidence: 98%

Si nanocrystal solution with stability for one year

Kajiya

Saitow

2018

RSC Adv.

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Resolving the source of blue luminescence from alkyl-capped silicon nanoparticles synthesized by laser pulse ablation

Cited by 10 publications

References 51 publications

Improvement of Laser Processing for Colloidal Silicon Nanocrystal Formation in a Reactive Solvent

Improvement of Laser Processing for Colloidal Silicon Nanocrystal Formation in a Reactive Solvent

Laser synthesis of nanoparticles in organic solvents – products, reactions, and perspectives

Si nanocrystal solution with stability for one year

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