Preparação e caracterização elétrica de sensores de metanol à base de nanocompósitos híbridos de polipirrol/nanopartículas metálicas

Oliveira, Ariadne Helena Pequeno de; Tavares, Ginetton F.; Jr., J. J. F. Albuquerque; Andrade, César A.S.

doi:10.1590/s0104-14282010005000042

Cited by 1 publication

(1 citation statement)

References 32 publications

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“…As a conducting polymer, PPy has been widely explored for a comprehensive range of applications in biosensors [21,22], gas sensors [23], microactuators [24], electrochemical supercapacitor [25] for its good environmental stability, facile synthesis, and higher conductivity. In particular, PPy has gained a distinguished popularity in biosensor applications because of its good biocompatibility, high sensitivity and fast response [26].…”

Section: Introductionmentioning

confidence: 99%

Replication of polypyrrole with photonic structures from butterfly wings as biosensor

Tang

Zhu

Chen

et al. 2012

Materials Chemistry and Physics

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Polypyrrole (PPy) with photonic crystal structures were synthesized from Morpho butterfly wings using a two-step templating process. In the first step photonic crystal SiO2 butterfly wings were synthesized from Morpho butterfly wings and in the second step the SiO2 butterfly wings were used as templates for the replication of PPy butterfly wings using an in situ polymerization method. The SiO2 templates were then removed from the PPy butterfly wings using a HF solution. The hierarchical structures down to the nanometer level, especially the photonic crystal structures, were retained in the final PPy replicas, as evidenced directly by field-emission scanning electron microscope (FE-SEM) and transmission electron microscopy (TEM). The optical properties of the resultant PPy replicas were investigated using reflectance spectroscopy and the PPy replicas exhibit brilliant color due to Bragg diffraction through its ordered periodic structures. The preliminary biosensing application was investigated and it was found that the PPy replicas showed a much higher biological activity compared with PPy powders through their response to dopamine (DA), probably due to the hierarchical structures as well as controlled porosity inherited from Morpho butterfly wings. It is expected that our strategy will open up new avenues for the synthesis of functional polymers with photonic crystal structures, which may form applications as biosensors. Abstract: Photonic crystal polypyrrole (PPy) butterfly wings were synthesized from Morpho butterfly wings by using a two-step templating process. In the first step photonic crystal SiO 2 butterfly wings were synthesized from Morpho butterfly wings and in the second step the obtained SiO 2 replicas were used as templates for the duplication of PPy butterfly wings by using an in situ polymerization method. The SiO 2 templates were then removed from the PPy butterfly wings using a HF solution. The precise structures of the replicas were characterized by using field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM). Molecular structure and the composition of the PPy replicas were further characterized by Fourier infrared spectroscopy (FT-IR) and energy-dispersive X-ray spectroscopy (EDS), respectively. It was confirmed that the photonic crystal PPy replicas were made of pure PPy. The optical properties of 2 the resultant PPy replicas were investigated by using reflectance spectroscopy and the PPy replicas exhibit brilliant color due to Bragg diffraction through its ordered periodic structures. The primary response of the replicas to dopamine (DA) as a biosensor was investigated and it was found that the PPy replicas showed a much higher biological activity compared with PPy powders, probably due to the hierarchical structures as well as controlled porosity inherited from Morpho butterfly wings. It is expected that our strategy will open up new avenues for the synthesis of functional polymers with photonic crystal structures, which can form the basis of p...

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