Dehydrocoupling – an alternative approach to functionalizing germanium nanoparticle surfaces

Hossain, Asjad; Javadi, Morteza; Yu, Haoyang; Thiessen, Alyxandra; Ikpo, Nduka; Oliynyk, Anton O.; Veinot, Jonathan G. C.

doi:10.1039/c9nr10837h

Cited by 4 publications

(4 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For NPs synthesized with hydride termination, ligand passivation can be achieved by reaction with organic precursors. For example, alkylsilyl termination of Ge NPs was recently achieved via a heteronuclear dehydrocoupling reaction . Direct and indirect ligand exchange methods have also been used to introduce surface functionalities that may otherwise be inaccessible during synthesis.…”

Section: Introductionmentioning

confidence: 99%

“…For example, alkylsilyl termination of Ge NPs was recently achieved via a heteronuclear dehydrocoupling reaction. 4 Direct and indirect ligand exchange methods have also been used to introduce surface functionalities that may otherwise be inaccessible during synthesis. Direct ligand exchange depends on the binding competition between ligands; in one example, oleylamine (OAm) was replaced directly from the surface of Ge 1−x E x NPs by washing with less labile hexylamine.…”

Section: ■ Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Diorganyl Dichalcogenides as Surface Capping Ligands for Germanium Nanocrystals

Newton

Tabatabaei

et al. 2020

Organometallics

View full text Add to dashboard Cite

Indirect ligand exchange methods have been demonstrated to replace the oleylamine capping with dodecanethiol for germanium nanocrystals (Ge NCs). In these methods, hydrazine is employed to effectively remove the oleylamine ligand before the NCs are passivated by microwave-assisted heating with dodecanethiol. In this work, octadecanethiol passivation is accomplished by the in situ reaction of dioctadecyl disulfide with diphenylphosphine. 1H NMR and FTIR are used to characterize the surface ligand capping and the effectiveness of ligand exchange. Thiol passivation is achieved either by an exchange reaction at room temperature or by using microwave-assisted heating. Indirect and direct ligand exchange methods are demonstrated to be effective. The microwave-assisted reaction of GeI2 with dioctadecyl disulfide also achieves thiol passivation without interfering in the formation of Ge NCs. Additional experiments study the effects of nanoparticle synthesis temperature, solvent, and ligand concentration on the exchange of oleylamine for octadecanethiol ligands.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Diorganyl Dichalcogenides as Surface Capping Ligands for Germanium Nanocrystals

Newton

Tabatabaei

et al. 2020

Organometallics

View full text Add to dashboard Cite

show abstract

“…S21a, ESI †) provided a binding energy of 29.6 eV, consistent reports for Ge in the nanoparticles. 32 Notably, the majority of Ge 4+ species were observed at 32.5 eV, while some Ge 2+ species were noted as evidenced by a feature at 31.7 eV. This observation suggests that the agglomeration of GeNPs during the reaction increased the likelihood of forming Ge-O-Ge bonds in the HEA NPs@GeNPs, resulting in a higher prevalence of Ge 4+ species.…”

Section: Synthesis Of Hea Nps@genpsmentioning

confidence: 91%

“…Hydride-terminated germanium nanoparticles were released from the sample through ethanolic hydrofluoric acid (HF) etching, using a modified literature procedure. 32 Caution! HF is dangerous; extreme care and compliance with local regulations is required.…”

Section: Methodsmentioning

confidence: 99%

Facile synthesis of high-entropy alloy nanoparticles on germanane, Ge nanoparticles and wafers

O’Connor

Trach

et al. 2023

Nanoscale Horiz.

Self Cite

View full text Add to dashboard Cite

show abstract

Characterization of Germanium Nanoparticles from Arylgermanium Trihydrides

Schmid,

Bitschnau,

Finšgar

et al. 2024

Chemistry A European J

View full text Add to dashboard Cite

Germanium is a promising basis for nanomaterials due to its low toxicity and valuable optical and electronic properties. However, germanium nanomaterials have seen little research compared to other group 14 elements due to unpredictable chemical behavior and high costs. Here, we report the dehydrocoupling of o‐tolylgermanium trihydride to amorphous nanoparticles. The reaction is facilitated through reflux at 162 °C and can be accelerated with an amine base catalyst. Through cleavage of both H2 and toluene, new Ge‐Ge bonds form. This results in nanoparticles consisting of crosslinked germanium with o‐tolyl termination. The particles are 2‐6 nm in size and have masses above approximately 3500 Da. The organic substituents are promising for further functionalization. Combined with strong absorption up to 600 nm and moderate solubility and air stability, there are numerous possibilities for future applications.

show abstract

Dehydrocoupling – an alternative approach to functionalizing germanium nanoparticle surfaces

Abstract: Schematic representation of dehydrocoupling of H-GeNPs with alkylsilanes, and Electron Energy Loss Spectroscopy (EELS) line scan of alkylsilane passivated GeNPs showing Si on the surface and Ge in the core.

Cited by 4 publications

References 39 publications

Diorganyl Dichalcogenides as Surface Capping Ligands for Germanium Nanocrystals

Diorganyl Dichalcogenides as Surface Capping Ligands for Germanium Nanocrystals

Facile synthesis of high-entropy alloy nanoparticles on germanane, Ge nanoparticles and wafers

Characterization of Germanium Nanoparticles from Arylgermanium Trihydrides

Contact Info

Product

Resources

About