Spray layer-by-layer films based on phospholipid vesicles aiming sensing application via e-tongue system

Aoki, Pedro H.B.; Volpati, Diogo; Cabrera, Flávio Camargo; Trombini, V.; Riul, A.; Constantino, Carlos J. L.

doi:10.1016/j.msec.2012.02.004

Cited by 22 publications

(25 citation statements)

References 37 publications

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“…Therefore, though it is clear that the addition of small aliquots of atrazine solution to increase the concentration leads to changes in the electrical response, thus corresponding to a high sensitivity, such changes are irreversible. As in similar work with other analytes [45,30], irreversible adsorption on the LbL films may occur, with adsorbed molecules not being removed in the washing procedures. In Aoki et al [45], such adsorption was confirmed with SERS experiments, but this could not be done here because the SERS signal for the LbL films was negligible.…”

Section: Sensing Atrazine With Impedance Spectroscopymentioning

confidence: 77%

“…The combination of interdigitated electrodes, ultrathin films, and impedance spectroscopy is a well-established approach to detect trace levels of different analytes, including water pollutants [30,47]. As a complementary approach, the performance of PAH/AgNPs LbL films as transducers in sensing units was checked by immersing it into aqueous solutions containing atrazine at different concentrations.…”

Section: Sensing Atrazine With Impedance Spectroscopymentioning

confidence: 99%

“…In this study, we report on atrazine detection with SERS using Ag colloids for concentrations between 10 −7 and 10 −12 M. For comparison purposes, we also used impedance spectroscopy with a sensor array as in typical work of electronic tongues [29,30] and cyclic voltammetry [31], in a methodology that has been applied to detect environmental pollutants. In such measurements, the sensing units were made of a bare electrode (Pt interdigitated for impedance and indium tin oxide (ITO) for cyclic voltammetry), and electrodes were coated with layer-by-layer (LbL) films containing gold or silver nanoparticles (AuNPs or AgNPs).…”

Section: Introductionmentioning

confidence: 99%

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Detection of trace levels of atrazine using surface-enhanced Raman scattering and information visualization

et al. 2014

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The detection of trace amounts of pesticides is essential for the quality control of waters, particularly with their inevitable increasing use with the growing demand for food. In this study, we report on the detection of atrazine, a highly toxic herbicide, down to 5×10−12 M, which is sufficient to monitor the quality of drinking water even according to the most stringent international regulations. Such detection was performed with surface-enhanced Raman scattering (SERS) in atrazine incorporated into silver nanoparticles (AgNPs) colloids, with the SERS spectra being treated with Sammon's mapping, an information visualization technique. In addition to providing a fingerprint of the atrazine molecules, SERS is advantageous in comparison with impedance spectroscopy and cyclic voltammetry applied to a sensor array of units made with layer-by-layer (LbL) films containing AgNPs and AuNPs. The combined use of SERS and information visualization methods is promising for monitoring water quality with regard to other pesticides, which may even approach single molecule detection.

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Section: Sensing Atrazine With Impedance Spectroscopymentioning

confidence: 77%

Section: Sensing Atrazine With Impedance Spectroscopymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Detection of trace levels of atrazine using surface-enhanced Raman scattering and information visualization

et al. 2014

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“…An additional feature of the spray-LbL films is that the molecular architecture may differ from the corresponding dipping-LbL films [32], which calls for further research both in terms of film characterization as well as in the identification of novel applications. In this paper, we build upon a previous work [32] where dipped-and spray-LbL films containing phospholipid vesicles were compared, and investigate the molecular architectures of DODAB/DPPG LbL films.…”

Section: Introductionmentioning

confidence: 99%

“…In this paper, we build upon a previous work [32] where dipped-and spray-LbL films containing phospholipid vesicles were compared, and investigate the molecular architectures of DODAB/DPPG LbL films. Using a combination of experimental methods, we shall show that the molecular architecture of spray-LbL films differs considerably from that of dipping LbL films.…”

Section: Introductionmentioning

confidence: 99%

On the distinct molecular architectures of dipping- and spray-LbL films containing lipid vesicles

Aoki

Aléssio

Volpati

et al. 2014

Materials Science and Engineering: C

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Segmentation of scanning electron microscopy images from natural rubber samples with gold nanoparticles using starlet wavelets

Siqueira

Cabrera

Pagamisse

et al. 2013

Microscopy Res & Technique

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Electronic microscopy has been used for morphology evaluation of different materials structures. However, microscopy results may be affected by several factors. Image processing methods can be used to correct and improve the quality of these results. In this article, we propose an algorithm based on starlets to perform the segmentation of scanning electron microscopy images. An application is presented in order to locate gold nanoparticles in natural rubber membranes. In this application, our method showed accuracy greater than 85% for all test images. Results given by this method will be used in future studies, to computationally estimate the density distribution of gold nanoparticles in natural rubber samples and to predict reduction kinetics of gold nanoparticles at different time periods.

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Spray layer-by-layer films based on phospholipid vesicles aiming sensing application via e-tongue system

Cited by 22 publications

References 37 publications

Detection of trace levels of atrazine using surface-enhanced Raman scattering and information visualization

Detection of trace levels of atrazine using surface-enhanced Raman scattering and information visualization

On the distinct molecular architectures of dipping- and spray-LbL films containing lipid vesicles

Segmentation of scanning electron microscopy images from natural rubber samples with gold nanoparticles using starlet wavelets

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