Polypyrrole nanoparticles: control of the size and morphology

Paúrová, Monika; Šeděnková, Ivana; Hromádková, Jiřina; Babič, Michal

doi:10.1007/s10965-020-02331-x

Cited by 8 publications

(7 citation statements)

References 61 publications

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“…An increase in the APS/Py ratio provides Py with more oxidizing agents, enhancing the growth and oxidative levels of PPy. On the other hand, a high APS content can overoxidize PPy, preventing it from growing further. , Thus, the sheet-like structures were formed even at a relatively high APS/Py ratio.…”

Section: Resultsmentioning

confidence: 99%

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Study of Chemical Polymerization of Polypyrrole with SDS Soft Template: Physical, Chemical, and Electrical Properties

Samwang,

Watanabe,

Okamoto

et al. 2023

ACS Omega

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Section: Resultsmentioning

confidence: 99%

“…On the other hand, a high APS content can overoxidize PPy, preventing it from growing further. 52,53 Thus, the sheet-like structures were formed even at a relatively high APS/Py ratio.…”

Section: Uv−vis-nir Absorbance Of Ppy and Itsmentioning

confidence: 97%

Study of Chemical Polymerization of Polypyrrole with SDS Soft Template: Physical, Chemical, and Electrical Properties

Samwang,

Watanabe,

Okamoto

et al. 2023

ACS Omega

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“…The presented PPy-NPs were prepared by two different experimental methods in the presence of PVP which was used as a polymer stabilizing particle during the polymerization. The absence of PVP vibration bands in the Raman spectra confirmed that the PVP molecules are present solely in the particle matrices rather than on the surfaces, which offers a possibility for post synthetic modification in future stages [ 36 ]. The effect of different APS molar ratio on the particle size, hydrodynamic properties, morphology and UV-Vis and photoacoustic properties was examined.…”

Section: Resultsmentioning

confidence: 99%

“…Nanoparticles labeled as PPyA05, PPyA10, PPyA20, PPyA30, and PPyA50 were prepared by oxidation of Py monomer (300 mg, 4.42 mmol) with different molar ratios of APS (5 mL solution, n Py: n APS, 1:0.5, 1:1, 1:2, 1:3 and 1:5 respectively) in the presence of 1 wt.% PVP (65 mL) solution. Preparation was performed in the 100 mL septum-sealed flasks at room temperature [ 36 ].…”

Section: Methodsmentioning

confidence: 99%

“…Thus, it is not entirely clear how, for example, particle size, colloidal stability, degree of oxidation and surface coating affect contrast quality [ 32 , 33 , 34 ]. We have recently shown that by using different oxidants and surfactants/stabilizers at different concentrations, particle size and size distribution can be well controlled during synthesis at the same time [ 35 , 36 ].…”

Section: Introductionmentioning

confidence: 99%

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Photoacoustic Properties of Polypyrrole Nanoparticles

et al. 2021

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Photoacoustic imaging, an emerging modality, provides supplemental information to ultrasound imaging. We investigated the properties of polypyrrole nanoparticles, which considerably enhance contrast in photoacoustic images, in relation to the synthesis procedure and to their size. We prepared polypyrrole nanoparticles by water-based redox precipitation polymerization in the presence of ammonium persulphate (ratio nPy:nOxi 1:0.5, 1:1, 1:2, 1:3, 1:5) or iron(III) chloride (nPy:nOxi 1:2.3) acting as an oxidant. To stabilize growing nanoparticles, non-ionic polyvinylpyrrolidone was used. The nanoparticles were characterized and tested as a photoacoustic contrast agent in vitro on an imaging platform combining ultrasound and photoacoustic imaging. High photoacoustic signals were obtained with lower ratios of the oxidant (nPy:nAPS ≥ 1:2), which corresponded to higher number of conjugated bonds in the polymer. The increasing portion of oxidized structures probably shifted the absorption spectra towards shorter wavelengths. A strong photoacoustic signal dependence on the nanoparticle size was revealed; the signal linearly increased with particle surface. Coated nanoparticles were also tested in vivo on a mouse model. To conclude, polypyrrole nanoparticles represent a promising contrast agent for photoacoustic imaging. Variations in the preparation result in varying photoacoustic properties related to their structure and allow to optimize the nanoparticles for in vivo imaging.

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