Electrochromic properties of poly{3-[12-(p-methoxyphenoxy)dodecyl]thiophene}

Ribeiro, Adriana S.; Nogueira, Verónica; Filho, Pedro Faria dos Santos; Paoli, Marco-Aurélio De

doi:10.1016/j.electacta.2003.12.044

Cited by 14 publications

(9 citation statements)

References 24 publications

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“…The potential applied and time used for electrodeposition may influence the thickness of the so-deposited PEDOT films [29] and, therefore, the quality of the fingerprint image in order to provide a detailed visualization of its characteristic ridge patterns. Best experimental conditions were achieved as 0.9 V and 180 seconds with basis on visual observation according to the Bandey grading (see the Supporting Information), [28] and inspection of the characteris- The polymer film thickness, directly correlated to the deposition time, should be always less than the fingerprint residue thickness to avoid entirely cover the valleys between fingerprint ridges hampering its visualization.…”

Section: Electrodepositionmentioning

confidence: 99%

A low‐potential electrochemical method for fast development of latent fingerprints on brass cartridge cases by electrodeposition of poly(3,4‐ethylenedioxythiophene)

et al. 2020

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The electrodeposition of poly(3,4-ethylenedioxythiophene) (PEDOT) for development of latent fingerprints on brass cartridge cases may be successfully performed, even though the simultaneous corrosion process of copper and zinc from the brass surface occurs. PEDOT is electrodeposited by direct oxidation of the monomer in aqueous LiClO 4 solution using chronoamperometry (potentiostatic method) with experimental conditions set at 0.90 V versus Ag/AgCl and 180 seconds. Such strategy is interesting for application in forensic biometrics for development of latent fingerprints on brass cartridge cases, since it affords images with high definition, allowing a clear visualization of the ridge patterns and singular points, besides to be useful for confrontation in fingerprint databases. Therefore, this is a simple, efficient, fast, low-potential, and low-cost methodology for the processing of cartridge cases.

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Section: Electrodepositionmentioning

confidence: 99%

A low‐potential electrochemical method for fast development of latent fingerprints on brass cartridge cases by electrodeposition of poly(3,4‐ethylenedioxythiophene)

et al. 2020

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“…65%, chromatic contrast at 485 and 725 nm between 30% and 40%, response time between 4 and 2 s, and good optical memory in its reduced state (E ¼ 0:0 V) under open circuit [19]. PEDT-PSS has been investigated previously by other authors, and its electrochromic behavior was confirmed [22,[28][29][30][31].…”

Section: Resultsmentioning

confidence: 64%

“…These studies indicated that poly{3-[12-(p-methoxyphenoxy)dodecyl]thiophene}, poly(12-MPDDT), can be electrochemically deposited on glass/ITO electrodes and shows strong and stable chromatic variation from red in the reduced state to blue in the oxidized state [19]. These results with poly(12-MPDDT), Fig.…”

Section: Introductionmentioning

confidence: 79%

“…6(b)). In previous studies [19], the optical memory of a poly(12-MPDDT) film, using a 0.1 mol L À1 LiClO 4 solution in dry CH 3 CN as electrolyte, was investigated by polarizing it in the reduced state (0.0 V vs. AgjAgCl), disconnecting the circuit and recording its Vis-NIR spectrum at different time intervals. The transmittance variations at k ¼ 485 and 725 nm (k max for the reduced and oxidized states, respectively) were recorded in the same way for the device and remained unchanged during the time of the experiment.…”

Section: Resultsmentioning

confidence: 99%

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Solid-state electrochromic device based on two poly(thiophene) derivatives

Ribeiro

Machado

Filho

et al. 2004

Journal of Electroanalytical Chemistry

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“…It is thus clearly possible to control both thickness and morphology of electrodeposited dansylglycine films by adjusting the number of voltammetric cycles, which is related to the deposition charge (Q dep ). 48 The arithmetic mean roughness (R a ), the square average roughness (R ms ) and the relative surface area of the chitosan, dansylchloride-chitosan and electrodeposited dansylglycine films, are presented in Table 1. These data indicate that the morphological parameters vary markedly as a function of the deposition method used to obtain the fluorescent film, as can be seen in the fluorescent emissions when exposed to ultraviolet light irradiation (366 nm), of the dansyl chloridechitosan film and of the electrodeposited dansylglycine film (dry condition).…”

Section: Morphological Characterizationmentioning

confidence: 99%

Dansyl-based fluorescent films prepared by chemical and electrochemical methods: cyclic voltammetry, afm and spectrofluorimetry characterization

Júlia¹,

Silva²,

Silva³

et al. 2011

J. Braz. Chem. Soc.

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Filmes fluorescentes baseados em derivados de dansila foram preparados a partir de duas metodologias diferentes. Em uma delas, a superfície de um eletrodo de óxido de índio dopado com estanho (ITO) foi coberta com um filme de quitosana e o polímero foi posteriormente derivatizado com cloreto de dansila, enquanto que na outra metodologia, um filme de dansilglicina foi depositado eletroquimicamente sobre ITO. A técnica de microscopia de força atômica (AFM) foi usada para mapear a superfície dos filmes. A comparação das propriedades eletroquímicas, fotoquímicas e morfológicas destes filmes indicou que o filme de dansilglicina depositado eletroquimicamente sobre ITO apresentou resposta eletroquímica, nível de fluorescência mais intenso, maior rugosidade superficial e maior área superficial relativa em comparação com o seu homólogo quitosana-cloreto de dansila. Esse comportamento pode ser atribuído ao maior número de sítios ativos presentes na estrutura bem organizada do filme eletrodepositado em comparação com os filmes produzidos quimicamente.Dansyl-based fluorescent films were prepared by two different methods. In one of them, the surface of an indium tin oxide (ITO) electrode was coated with a film of chitosan and the polymer subsequently derivatized with dansyl chloride, whilst in the second method a film of dansylglycine was electrochemically deposited on the ITO surface. Atomic force microscopy (AFM) was employed to map the surfaces of the films. Comparison of the morphological, photochemical and electrochemical properties of these films indicated that the dansylglycine film electrodeposited on ITO exhibited electrochemical response, emitted a higher level of fluorescence, presented greater surface roughness and larger relative surface area in comparison with its dansyl chloridechitosan counterpart. This behavior can be attributed to the higher number of active sites present in the well-organized and rough structure of the electrodeposited film in comparison with the chemically produced films.Keywords: fluorescent films, chitosan, dansyl derivatives, atomic force microscopy IntroductionSurface immobilization of organic molecules on various solid supports to prepare thin films with desired properties has gained considerable research interest in the past few decades.1 This is because, on one hand, it can offer model systems to study surface-dependent phenomena like catalysis, 2 adhesion, 3 or wetting, 4 and, on the other hand, it plays a great role in the design and preparation of functionalized surface materials. 5,6 The photochemical, photophysical and electrochemical properties of these functional films offer a wide range of potential applications in nonlinear optics, 7 displays, 8,9 biomedicine and chemical sensors. 10Fluorescent films are of particular interest by virtue of their specific advantages regarding sensitivity and Silva et al. 1809 Vol. 22, No. 9, 2011 selectivity, once such films are reusable and are readily fabricated into devices. 6 Some special fluorophores, which may have two parts in the...

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Electrochromic properties of poly{3-[12-(p-methoxyphenoxy)dodecyl]thiophene}

Cited by 14 publications

References 24 publications

A low‐potential electrochemical method for fast development of latent fingerprints on brass cartridge cases by electrodeposition of poly(3,4‐ethylenedioxythiophene)

A low‐potential electrochemical method for fast development of latent fingerprints on brass cartridge cases by electrodeposition of poly(3,4‐ethylenedioxythiophene)

Solid-state electrochromic device based on two poly(thiophene) derivatives

Dansyl-based fluorescent films prepared by chemical and electrochemical methods: cyclic voltammetry, afm and spectrofluorimetry characterization

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