Doping in poly(o-ethoxyaniline) nanostructured films studied with atomic force spectroscopy (AFS)

Leite, Fábio L.; Alves, William Ferreira; Neto, Mario Oliveira; Polikarpov, Igor; Herrmann, P. S. de P.; Mattoso, Luiz H. C.; Oliveira, Osvaldo N.

doi:10.1016/j.micron.2008.07.003

Cited by 11 publications

(8 citation statements)

References 36 publications

(31 reference statements)

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“…Polaronic bands were observed in Figure at 420 and 800 nm. The doped state was formed by a poly(semi‐quinone) radical cation (Galvo et al ., ), which formed a conduction band in the middle of the polar on energy band, accounting for the high conductivity of the polymer (Alves et al ., ; Leite et al ., ).…”

Section: Resultsmentioning

confidence: 99%

Microcantilever sensors coated with doped polyaniline for the detection of water vapor

et al. 2013

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In the present work, PANI (polyaniline) emeraldine salt (doped) and base (dedoped) were used as the sensitive layer of a silicon microcantilever, and the mechanical response (deflection) of the bimaterial (coated microcantilever) was investigated under the influence of humidity. PANI in the emeraldine base oxidation state was obtained by interfacial synthesis and was deposited on the microcantilever surface by spin-coating (dedoped). Next, the conducting polymer was doped with 1 M HCl (hydrochloric acid). A four-quadrant AFM head with an integrated laser and a position-sensitive detector (AFM Veeco Dimension V) was used to measure the optical deflection of the coated microcantilever. The deflection of the coated (doped and undoped PANI) and uncoated microcantilever was measured under different humidities (in triplicate) at room pressure and temperature in a closed chamber to evaluate the sensor's sensitivity. The relative humidity (RH) in the chamber was varied from 20% to 70% using dry nitrogen as a carrier gas, which was passed through a bubbler containing water to generate humidity. The results showed that microcantilevers coated with sensitive layers of doped and undoped PANI films were sensitive (12,717 ± 6% and 6,939 ± 8%, respectively) and provided good repeatability (98.6 ± 0.015% and 99 ± 0.01%, respectively) after several cycles of exposure to RH. The microcantilever sensor without a PANI coating (uncoated) was not sensitive to humidity. The strong effect of doping on the sensitivity of the sensor was attributed to an increased adsorption of water molecules dissociated at imine nitrogen centers, which improves the performance of the coated microcantilever sensor. Moreover, microcantilever sensors coated with a sensitive layer provided good results in several cycles of exposure to RH (%).

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Section: Resultsmentioning

confidence: 99%

Microcantilever sensors coated with doped polyaniline for the detection of water vapor

et al. 2013

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“…During withdrawal, adhesion or any other bonds formed during contact with the test surface causes the tip to adhere to the sample. Cantilever travels larger distance beyond the initial contact point on the approach curve to pull-off to non-contact position [6,9].…”

Section: Experiments Detailsmentioning

confidence: 99%

“…Such a recent development is using the magnetic tip in place of regular AFM tips to probe the magnetic fields with sub 100 nm resolution [5]. The understanding of the various parameters for operation of force spectroscopy has been first explored by the earlier work [6]. Nevertheless, despite the wide employment of MFM technique for the qualitative characterization of magnetic materials, there are not substantial studies of the correlation between phase map obtained using MFM and magnetic interaction force variation over the separation.…”

Section: Introductionmentioning

confidence: 99%

Probing Atomic Level Interactions in Ni Nanorods and Afm Cantilever Using Atomic Force Microscopy Based F–d Spectroscopy

Dutta

Singh

Bobji

2017

Proccedings of International Scientific Conference "BALTTRIB 2017"

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Atomic force microscopy based force-displacement spectroscopy is used to quantify magnetic interaction force between sample and magnetic cantilever. AFM based F-D spectroscopy is used widely to understand various surface-surface interaction at small scale. Here we have studied the interaction between a magnetic nanocomposite and AFM cantilevers. Two different AFM cantilever with same stiffness but with and without magnetic coating is used to obtain F-D spectra in AFM. The composite used has magnetic Ni nanophase distributed uniformly in an Alumina matrix. Retrace curves obtained using both the cantilevers on magnetic composite and sapphire substrate are compared. It is found for magnetic sample cantilever comes out of contact after traveling 100 nm distance from the actual point of contact. We have also used MFM imaging at various lift height and found that beyond 100nm lift height magnetic contrast is lost for our composite sample, which further confirms our F-D observation.

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“…There are, however, only a few methods to probe such interfacial phenomena, one of which is AFS. Leite et al [92] used force curve measurements to estimate adhesion forces for a nanostructured film of POEA doped with various acids, in measurements performed in air. The adhesion force was lower for POEA doped with inorganic acids, such as HCl and H 2 SO 4 , than with organic acids, because the counterions were screened by the ethoxy groups.…”

Section: Force Spectroscopymentioning

confidence: 99%

Atomic Force Microscopy Study of Conductive Polymers

Sanches

Oliveira

Leite

2010

Nanostructured Conductive Polymers

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Doping in poly(o-ethoxyaniline) nanostructured films studied with atomic force spectroscopy (AFS)

Cited by 11 publications

References 36 publications

Microcantilever sensors coated with doped polyaniline for the detection of water vapor

Microcantilever sensors coated with doped polyaniline for the detection of water vapor

Probing Atomic Level Interactions in Ni Nanorods and Afm Cantilever Using Atomic Force Microscopy Based F–d Spectroscopy

Atomic Force Microscopy Study of Conductive Polymers

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