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Synthesis of amphiphilic Janus gold nanoparticles stabilized with triphenylphosphine and D-penicillamine by ligand exchange at toluene/water emulsion interface

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Abstract

Ligand exchange was triggered at toluene/water emulsion interface between homogeneous gold nanoparticles (Au NPs) with triphenylphosphine (PPh3) and D-penicillamine (D-PA), resulted in amphiphilic Janus Au NPs with both phosphine and thiolate ligands. TEM and XRD analyses indicate that the product is composed of Au nanocrystals in an average diameter of about 3.7 nm. XPS, FTIR, Raman, and 1H NMR analyses demonstrate that the Au NPs are protected with hydrophilic D-PA molecules and lipophilic PPh3 ligands in a molecular ratio of ca. 1.8. The NOESY analysis and contact angle measurement further suggest that the D-PA and PPh3 molecules are spontaneously separated to form compartmentalized hydrophilic and lipophilic regions on the individual Au NPs, which exhibit good catalytic performance and recyclability on the reduction of 4-nitrophenol. The results demonstrate that amphiphilic Janus Au NPs can be synthesized by partly exchange of PPh3 with D-PA at toluene/water emulsion interface and are potentially applicable for other phosphine/thiolate pairs to modify Au NPs.

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Funding

The authors gratefully acknowledge the support from the National Natural Science Foundation of China (No. 51874051 and 21163004) and Guangxi Natural Science Foundation (No. 2018GXNSFAA138133).

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Authors and Affiliations

  1. School of Materials Science & Engineering, Changzhou University, Changzhou, 213164, People’s Republic of China

    Kun Luo

  2. School of Materials Science and Engineering, Baise University, Baise, 533000, People’s Republic of China

    Degui Li

  3. College of Materials Science and Engineering, Guilin University of Technology, Guilin, 541004, People’s Republic of China

    Degui Li, Jiaxin Lan, Zhihong Luo & Fujie Li

  4. Faculty of Pharmacy, University of Sydney, Sydney, NSW, 2006, Australia

    Yujia Luo

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  1. Degui Li
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  2. Yujia Luo
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  3. Jiaxin Lan
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  4. Zhihong Luo
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  5. Fujie Li
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Correspondence to Kun Luo.

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Li, D., Luo, Y., Lan, J. et al. Synthesis of amphiphilic Janus gold nanoparticles stabilized with triphenylphosphine and D-penicillamine by ligand exchange at toluene/water emulsion interface. Gold Bull 53, 55–62 (2020). https://doi.org/10.1007/s13404-020-00274-1

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  • DOI: https://doi.org/10.1007/s13404-020-00274-1

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