The effect of protonation and oxidation state of polyaniline on the stability of gold nanoparticles

Kabomo, Tlhabologo Moses; Scurrell, Michael S.

doi:10.1016/j.eurpolymj.2016.04.004

Cited by 15 publications

(11 citation statements)

References 27 publications

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“…The BE value of Au 4 f 7/2 is higher than that of Au 0 , but much lower than that of Au 1+ . It probably means that the Au 0 surface is positively charged to Au δ+ (0 < δ < 1) because of the interaction or the charge transfer between the metallic Au NPs and the imine nitrogens (N) of PANI 13,16 . Curve fittings of XPS based on the BE values of Au 4f 7/2 for freshly prepared Fe 3 O 4 /PANI/Au(In Situ) show that the content of Au 0 and Au 1+ is 55.93 and 44.07% for freshly prepared Fe 3 O 4 /PANI/Au(In Situ) with the peaks centered at 84.23 and 85.09 eV, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…It was reported that the imine sites (N + H) of protonated or doped PANI could absorb the gold ions (AuCl 4 − ) and reduced them in situ to obtain small and stable gold NPs 15 . The charge transfer in catalysts from imine nitrogen to Au favored the stabilization of gold NPs 16 . And the charge transfer or the interaction between PANI and gold NPs was important for the improvement of catalytic activity 17 …”

Section: Introductionmentioning

confidence: 99%

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Insights into the interaction between PANI and Au NPs of magnetic core‐shell Fe₃O₄/PANI/Au catalysts with remarkable catalytic performance in 4‐NP reduction

Sun

Zhang

et al. 2021

J of Applied Polymer Sci

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Magnetic Fe3O4/PANI core‐shell composites were prepared as the support of gold catalysts. The Fe3O4 magnetic core was prepared by solvothermal reaction and coated with polyaniline (PANI) shell via in situ aniline polymerization on Fe3O4 surface. Au nanoparticles were loaded on Fe3O4/PANI composites through gold sol adsorption and in situ reduction method to prepare Fe3O4/PANI/Au(Sol) and Fe3O4/PANI/Au(In Situ) catalysts, respectively. We found that the initial activities of Fe3O4/PANI/Au(Sol) were higher than that of Fe3O4/PANI/Au(In Situ) due to the small size effect of Au in catalysts. Although the size of Au in Fe3O4/PANI/Au(In Situ) was bigger than that in Fe3O4/PANI/Au(Sol), it should be noted that both of Fe3O4/PANI/Au(Sol) and Fe3O4/PANI/Au(In Situ) possessed good catalytic recycling stability. The conversion of 4‐NP was still above 97% and 99% after 15 cycles for Fe3O4/PANI/Au(Sol) and Fe3O4/PANI/Au(In Situ), respectively. The good catalytic stability for Fe3O4/PANI/Au(In Situ) could be attributed to the stronger interaction between PANI and Au NPs. We believe that our work provides an effective strategy for the preparation of long‐life catalysts and the investigations can be used to design other conductive polymers supported noble metal catalysts.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Insights into the interaction between PANI and Au NPs of magnetic core‐shell Fe₃O₄/PANI/Au catalysts with remarkable catalytic performance in 4‐NP reduction

Sun

Zhang

et al. 2021

J of Applied Polymer Sci

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“…4. While the calculated curve also indicates a linear increase, there is a concentration difference of around 9×10 [17][18][19][20]. A different view is advocated by Janata and co-workers in their work on atomic metals [7,8,11,21,22].…”

Section: Discussionmentioning

confidence: 99%

“…Besides Au, also Cl, F, O and N have been detected with the following average quantities across all measured samples: Cl=(1.12 ± 0.49)×10 17 PANI layer thickness of ~ 540 nm assuming a literature value of the volume density of PANI of 1.329 g/cm³ [13]. Please note that it is not possible to quantify the amount of C as the substrate itself consists of carbon.…”

Section: Quanti Cation Of the Introduced Aumentioning

confidence: 99%

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Two-Step Electrochemical Au Nanoparticle Formation in Polyaniline

Zhao

Becker

Gutsch

2023

Preprint

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Insertion of Au nanoparticles (NPs) in polyaniline (PANI) is investigated using a two-step electrochemical process. In the first step, tetrachloroaurate anions (AuCl4−) are attached on the protonated imine sites of PANI while holding the potential at + 0.8 V vs. Ag/AgCl. The applied electrochemical potential prevents any reduction of the PANI/AuCl4− complex. After rinsing of excess AuCl4−, a controlled reduction is carried out via cyclic voltammetry (CV). We demonstrate that the reduction leads to a nucleation and growth of Au NPs whose density and size dispersion depend on the Au loading in PANI. Adding more deposition cycles increases the Au NP density and size. We further use Rutherford backscattering spectrometry (RBS) to quantify the Au uptake in PANI. We also find that the Au distribution is initially homogeneous across the PANI layer whereas the increasing number of deposition cycles leads to a surface segregation of Au. We propose a two-step growth model based on our experimental results. Finally, we discuss the results with respect to the formation of atomic Au clusters reported previously using the same deposition method.

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Stabilization of colloidal metallic nanoparticles using polymers and hexa-substituted compounds with 1,3,4-oxadiazole pendant groups

et al. 2019

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The effect of protonation and oxidation state of polyaniline on the stability of gold nanoparticles

Cited by 15 publications

References 27 publications

Insights into the interaction between PANI and Au NPs of magnetic core‐shell Fe₃O₄/PANI/Au catalysts with remarkable catalytic performance in 4‐NP reduction

Insights into the interaction between PANI and Au NPs of magnetic core‐shell Fe₃O₄/PANI/Au catalysts with remarkable catalytic performance in 4‐NP reduction

Two-Step Electrochemical Au Nanoparticle Formation in Polyaniline

Stabilization of colloidal metallic nanoparticles using polymers and hexa-substituted compounds with 1,3,4-oxadiazole pendant groups

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The effect of protonation and oxidation state of polyaniline on the stability of gold nanoparticles

Cited by 15 publications

References 27 publications

Insights into the interaction between PANI and Au NPs of magnetic core‐shell Fe3O4/PANI/Au catalysts with remarkable catalytic performance in 4‐NP reduction

Insights into the interaction between PANI and Au NPs of magnetic core‐shell Fe3O4/PANI/Au catalysts with remarkable catalytic performance in 4‐NP reduction

Two-Step Electrochemical Au Nanoparticle Formation in Polyaniline

Stabilization of colloidal metallic nanoparticles using polymers and hexa-substituted compounds with 1,3,4-oxadiazole pendant groups

Contact Info

Product

Resources

About

Insights into the interaction between PANI and Au NPs of magnetic core‐shell Fe₃O₄/PANI/Au catalysts with remarkable catalytic performance in 4‐NP reduction

Insights into the interaction between PANI and Au NPs of magnetic core‐shell Fe₃O₄/PANI/Au catalysts with remarkable catalytic performance in 4‐NP reduction