Difference in doping behavior between polypyrrole films and powders

Kim, D.Y.; Lee, J.Y.; Kim, C.Y.; Kang, En‐Tang; Tan, K. L.

doi:10.1016/0379-6779(95)03286-x

Cited by 64 publications

(12 citation statements)

References 15 publications

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“…This expansion may result in an enhanced charge transfer interaction between the polymer and the bulky dopant. 42 Key advantages of the use of high-resolution XPS are that doping levels may be more accurately determined using the N Plots of the doping level so measured as a function of growth current density for films grown over equal times are presented in Fig. 8(a).…”

Section: X-ray Photoelectron Spectroscopymentioning

confidence: 99%

Surface and electrochemical study of DBSA‐doped polypyrrole films grown on stainless steel

Prissanaroon

Brack

Pigram

et al. 2002

Surface & Interface Analysis

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Electrically conducting polypyrrole films doped with dodecylbenzenesulphonic acid (PPy-DBSA) have been electrochemically polymerized on stainless steel. The surface and electrochemical properties of the films were investigated by a combination of cyclic voltammetry (CV), scanning electron microscopy (SEM) and x-ray photoelectron spectroscopy (XPS). The CV results showed an irreversible reaction of electropolymerization. All PPy-DBSA films had a nodular or cauliflower-like surface morphology. The grain size was dependent on the growth current density and the growth time. The ratio of incorporated DBSA anions to pyrrole repeat units in the films was ∼1 : 2. The doping level, calculated from the positive charge accumulated in the polymer chain (at.% ratio .N + + N 2+ //N total /, varied as a function of the growth current density and the growth time. The maximum doping level occurred at a growth current density of 0.5 mA cm −2 , consistent with an oxidation peak of the pyrrole monomer observed by CV. The interfacial layer between the polymer and substrate was also studied. A sulphur-rich layer was observed, indicating the presence of a thin layer of DBSA at the interface. In addition, iron was detected on the metal side of the film as a result of its dissolution from the stainless-steel electrode during the electropolymerization process. These results have implications for the use of polypyrrole films as environmentally friendly corrosion mitigants.

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Section: X-ray Photoelectron Spectroscopymentioning

confidence: 99%

Surface and electrochemical study of DBSA‐doped polypyrrole films grown on stainless steel

Prissanaroon

Brack

Pigram

et al. 2002

Surface & Interface Analysis

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“…The resistance of electron movement decreased which made the conductivity of linear conjugation WPPy to increase. It has been reported that the doping amount of small molecular sulfonic acid in the WPPy prepared by chemical oxidation polymerization method was about 25–30 mol% [ 36 ], which was also known as the effective doping level. In the second phase, the hydrophilic agent in the reaction reached the threshold value.…”

Section: Resultsmentioning

confidence: 99%

Preparation and Properties of Waterborne Polypyrrole/Cement Composites

et al. 2021

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The electrical properties of cement are gaining importance for the application in building construction. Polypyrrole (PPy) has been widely applied in most fields because of its excellent conductivity performance, environmental friendliness, easy fabrication, and other specialties. These features made them useful for self-sensing applications. In this work, waterborne polypyrrole (WPPy) was prepared via the chemical oxidative polymerization with three kinds of hydrophilic agents: sodium lignosulfonate (LGS), sodium dodecyl sulfonate (SDS), and sodium dodecyl sulfate (SLS), and then WPPy/cement composites were prepared by mixing cement with it. The contact angle, conductivity, and microstructure of WPPy were characterized by contact angle tester, four-point probes, and SEM. The composition, microstructure, and properties of WPPy/cement composites were characterized by FTIR, TGA, XRD, and SEM. The content of LGS was 40 wt%, WPPy got the optimal comprehensive performance, the conductivity was 15.06 times of the control sample and the contact angle was reduced by 69.95%. SEM analysis showed that hydrophilic agent content had great effect on the particle size of WPPy, the average diameter of WPPy particles decreased from 200 nm to 50 nm with the increase of LGS content. The results also showed that the adding of WPPy in WPPy/cement composites can significantly improve the conductivity and compactness, optimize the microstructure of cement composite. When the content of WPPy was 1.25 wt%, WPPy/cement composite showed the lowest resistivity and saturated water content of cement composite was 8 wt%. In addition, it could also inhibit the formation of Ca(OH)2 in the early hydration process.

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“…After alkali treatment, PPYNP undergoes the deprotonation process, which alters its electronic structure. 52 As a result, the absorption peak around 470 nm blue shifts and the absorption between 700 and 1000 nm nearly disappears (Figure 3j, blue curve). Accompanied by this process, the color of the raspberry-like micromotor changes dramatically from black to blue gray (as indicated in Figure S9 in the Supporting Information), which leads to the disappearance of the photothermal effect.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Reprogrammable Logic Gate and Logic Circuit Based on Multistimuli-Responsive Raspberry-like Micromotors

Zhang

Liu

et al. 2016

ACS Appl. Mater. Interfaces

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In this paper, we report a polymer-based raspberry-like micromotor. Interestingly, the resulting micromotor exhibits multistimuli-responsive motion behavior. Its on-off-on motion can be regulated by the application of stimuli such as H2O2, near-infrared light, NH3, or their combinations. Because of the versatility in motion control, the current micromotor has great potential in the application field of logic gate and logic circuit. With use of different stimuli as the inputs and the micromotor motion as the output, reprogrammable OR and INHIBIT logic gates or logic circuit consisting of OR, NOT, and AND logic gates can be achieved.

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Difference in doping behavior between polypyrrole films and powders

Cited by 64 publications

References 15 publications

Surface and electrochemical study of DBSA‐doped polypyrrole films grown on stainless steel

Surface and electrochemical study of DBSA‐doped polypyrrole films grown on stainless steel

Preparation and Properties of Waterborne Polypyrrole/Cement Composites

Reprogrammable Logic Gate and Logic Circuit Based on Multistimuli-Responsive Raspberry-like Micromotors

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