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Sandwich-like layer-by-layer assembly of gold nanoparticles with tunable SERS properties

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ABSTRACT

Sandwich-like layer-by-layer thin films consisting of polyelectrolytes and gold nanoparticles were utilized to construct surface-enhanced Raman scattering (SERS) substrates with tunable SERS properties. It is found that both the size of the nanoparticles in the layers and the interlayer distance significantly influence the SERS performance of the multilayered thin film. These simple, low-cost, easily processable and controllable SERS substrates have a promising future in the field of molecular sensing.

No MeSH data available.


TEM images of the obtained Au NPs: (a) small Au NP, (b) big Au NP. The insets show the UV–vis spectra of the corresponding Au NP solutions.
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Figure 1: TEM images of the obtained Au NPs: (a) small Au NP, (b) big Au NP. The insets show the UV–vis spectra of the corresponding Au NP solutions.

Mentions: Au NPs are regarded as certified and promising nanoscale building blocks for both LbL assembly and SERS substrates. Two different sizes of Au NPs were synthesized by simple control of the added volume of sodium citrate solution. Small Au NPs (17.0 ± 1.2 nm) were obtained when 2 mL sodium citrate solution was injected, while big Au NPs (42.9 ± 5.4 nm) were obtained when 0.65 mL sodium citrate solution was injected, as shown in Fig. 1. The optical absorption peaks located at 520 and 532 nm indicate the strong surface plasmon resonance of the NPs. These uniform negatively charged citrate-protected Au NPs could be readily used in electrostatic LbL assembly.


Sandwich-like layer-by-layer assembly of gold nanoparticles with tunable SERS properties
TEM images of the obtained Au NPs: (a) small Au NP, (b) big Au NP. The insets show the UV–vis spectra of the corresponding Au NP solutions.
© Copyright Policy - Beilstein
Related In: Results  -  Collection

License 1 - License 2
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getmorefigures.php?uid=PMC4979642&req=5

Figure 1: TEM images of the obtained Au NPs: (a) small Au NP, (b) big Au NP. The insets show the UV–vis spectra of the corresponding Au NP solutions.
Mentions: Au NPs are regarded as certified and promising nanoscale building blocks for both LbL assembly and SERS substrates. Two different sizes of Au NPs were synthesized by simple control of the added volume of sodium citrate solution. Small Au NPs (17.0 ± 1.2 nm) were obtained when 2 mL sodium citrate solution was injected, while big Au NPs (42.9 ± 5.4 nm) were obtained when 0.65 mL sodium citrate solution was injected, as shown in Fig. 1. The optical absorption peaks located at 520 and 532 nm indicate the strong surface plasmon resonance of the NPs. These uniform negatively charged citrate-protected Au NPs could be readily used in electrostatic LbL assembly.

View Article: PubMed Central - HTML - PubMed

ABSTRACT

Sandwich-like layer-by-layer thin films consisting of polyelectrolytes and gold nanoparticles were utilized to construct surface-enhanced Raman scattering (SERS) substrates with tunable SERS properties. It is found that both the size of the nanoparticles in the layers and the interlayer distance significantly influence the SERS performance of the multilayered thin film. These simple, low-cost, easily processable and controllable SERS substrates have a promising future in the field of molecular sensing.

No MeSH data available.