Editorial

Freitas, Luiz Carlos Gomide

doi:10.1590/s0100-40421998000300001

Cited by 1 publication

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“…All spectra showed a band at ~478nm (2.59 eV) associated with the π-π* transition and a free tail above 800 nm associated with the bipolaron state of PPy. This characteristic reveals an expanding conformation of PPy and high degree of doping [12]. This result shows that the SDS also acts as a dopant.…”

Section: Resultsmentioning

confidence: 68%

Fabrication of Polypyrrole Nanoparticles Using Microemulsion Polymerization for Diferent Py/APS/SDS Molar Ratios

Santim

Aquino

Malmonge

2016

MSF

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Polypyrrole nanoparticles (PPy) were synthesized by the chemical oxidative microemulsion of pyrrole (Py) monomer using ammonium persulfate (APS) as an oxidant agent and sodium dodecylsulfate (SDS) as a surfactant at 28°C and 0°C. Different Py:APS:SDS molar ratios were used, and the properties of the resulting material were examined by four-probe DC electrical conductivity, ultraviolet-visible-near infrared (UV-vis-Nir), and Fourier-transform infrared (FTIR) spectroscopies as well as field-emission scanning electron microscopy (FESEM). UV-vis-Nir and FTIR spectra show the formation of a polaron band owing to the doping of PPy by SDS. The electrical conductivity and morphology of PPy nanoparticles depend on the synthesis conditions. Electrical conductivity of ~95.3×10-3 S/cm was achieved for PPy synthesized at 0°C. For the same Py:APS:SDS molar ratio, the nanoparticle shape changed from cylindrical to spherical upon simply lowering the synthesis temperature.

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Section: Resultsmentioning

confidence: 68%