Journal
NANOMATERIALS
Volume 11, Issue 7, Pages -Publisher
MDPI
DOI: 10.3390/nano11071678
Keywords
gold nanoparticles; plasma synthesis; polyethylene glycol; reactive oxygen species; surface plasmon resonance; surface-enhanced Raman scattering; optical sensing
Categories
Funding
- Basic Science Research Program through the National Research Foundation of Korea - Korea government [NRF-2018R1D1A1B07040386]
- Leading Foreign Research Institute Recruitment Program through the National Research Foundation of Korea (NRF) - Korea government [NRF-2016K1A4A3914113]
- Kwangwoon University
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Polyethylene glycol-functionalized gold nanoparticles were prepared by a plasma-assisted method without additional reducing chemicals. The gold precursor transformed into Au@PEG NPs colloid that exhibited surface plasma resonance at 530 nm. The rapid, low-cost, and environmentally friendly method will facilitate the application of plasma-synthesized nanomaterials in sensors.
Polyethylene glycol-functionalized gold nanoparticles (Au@PEG NPs) were prepared by a simple plasma-assisted method without additional reducing chemicals. After irradiating tetrachloroauric acid (HAuCl4) and polyethylene glycol (PEG) in aqueous medium with an argon plasma jet, the gold precursor transformed into an Au@PEG NP colloid that exhibited surface plasma resonance at 530 nm. When the plasma jet entered the water, additional reactive species were induced through interactions between plasma-generated reactive species and aqueous media. Interaction of the gold precursor with the plasma-activated medium allowed the synthesis of gold nanoparticles (AuNPs) without reductants. The plasma-synthesized Au@PEG NPs had a quasi-spherical shape with an average particle diameter of 32.5 nm. The addition of PEG not only helped to stabilize the AuNPs but also increased the number of AuNPs. Au@PEG NP-loaded paper (AuNP-paper) was able to detect the degradation of rhodamine B, therefore, indicating that AuNP-paper can act as a surface-enhanced Raman scattering platform. Dye degradation by plasma treatment was investigated by optical absorption and Raman spectroscopy. The method proposed for the fabrication of Au@PEG NPs is rapid, low-cost, and environment-friendly and will facilitate the application of plasma-synthesized nanomaterials in sensors.
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