Nanosensors

Bueno, Carolina; García, Pamela Soto; Steffens, Clarice; Deda, Daiana K.; Leite, Fábio L.

doi:10.1016/b978-0-323-49780-0.00005-3

Cited by 10 publications

(6 citation statements)

References 145 publications

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“…Figure 8 depicts the CV responses of the redox probe at the CNPs electrode and CNTs-modified WE. However, CV provides essential information regarding electrochemical reaction reversibility and the type and speed of redox reactions (Bueno et al , 2017). Typical oxidation-reduction peaks appeared in both electrodes, confirming the occurrence of the electrochemical reaction of the ferrocyanide on the WE.…”

Section: Resultsmentioning

confidence: 99%

Development of an inkjet-printed electrochemical nanosensor for ascorbic acid detection

Alhazimeh

Al-Fandi

Al-Ebbini

2022

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Purpose Ascorbic acid (AA) is an essential vitamin for human health. Therefore, fast and cost-effective detecting of AA is essential, whether in human or food samples. The purpose of this paper is to develop an electrochemical nanosensor for AA detection. Design/methodology/approach The proposed nanosensor was developed by printing carbon nanoparticles ink and silver nanoparticles ink on a polydimethylsiloxane (PDMS) substrate. The surface of the PDMS substrate was first treated by corona plasma. Then, the nanomaterials printer was used to deposit both inks on the substrate. The working electrode surface was modified by drop-casting of carbon nanotubes. Morphological evaluation was applied using scanning electron microscopy and cyclic voltammetry. Also, a potentiostat was used to detect AA by differential pulse voltammetry. Findings It has been shown that the developed nanosensor linearly worked at a range of (0–5 mM), with a limit of detection lower than 0.8 mM and a relative standard deviation of 6.6%. Originality/value The developed nanosensor is characterized by a simple and cost-effective sensing tool for AA. In particular, the nanomaterials enhanced the nanosensor’s sensitivity due to the high catalytic activity.

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Section: Resultsmentioning

confidence: 99%

Development of an inkjet-printed electrochemical nanosensor for ascorbic acid detection

Alhazimeh

Al-Fandi

Al-Ebbini

2022

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“…Despite the low MW of OS-PAMAM on comparison to PAMAM G6, the similar adhesion force could be due to related surface functional groups between both dendrimers [44,45]. Dendrimers in biomedical applications interact with cargo molecules and cells, and the force of adhesion provides the fundamental basis for the hypothetical notion that high binding avidity [46].…”

Section: Comparative Analysis Of Size Shape and Force Measurements By...mentioning

confidence: 99%

Structural and physicochemical characteristics of one-step PAMAM dendrimeric nanoparticles

Torres-Pérez

Vallejo-Castillo

Vázquez-Leyva

et al. 2022

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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“…During the past decade, an application of nanoparticles in chemical sensors and biosensors has been established, 20 which has led to the concept of "nanosensors". 21 In principle, a certain amount of PThBA nanoparticles (PThBA NPs) is also formed during electrochemical polymerization, we have observed them in the polymerization solution by optical scattering. However, the yield of PThBA NPs in the electrochemical synthesis was so low that it was not feasible to characterize them or to collect a quantity of the material that could be used for further analytical applications�the main product of the electrochemical synthesis of PThBA is the polymer film on the electrode surface.…”

Section: Introductionmentioning

confidence: 97%

Poly-3-thienylboronic Acid Nanoparticles: Synthesis, Characterization, and Interaction with Saccharides Studied at the Level of Individual Nanoparticles

Kolosova,

Efremenko,

Laurinavichyute

et al. 2024

ACS Appl. Nano Mater.

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Polythiophenboronic acid (PThBA) combines an affinity for saccharides with the unique properties of conducting polymers. This polymer was synthesized by enzymatic catalyzed oxidative polymerization, characterized by UV–vis spectroscopy in solvents of different polarity and by 1H NMR. A suspension of PThBA nanoparticles (PThBA NPs) was prepared by injecting a methanol solution of PThBA into an aqueous electrolyte. PThBA NPs were characterized by scanning electron microscopy. Nanoparticle tracking analysis and dynamic light scattering were used to study the concentration of the particles and the particle size distribution. The effect of pH on these properties was analyzed and an increase in nanoparticle size was observed at alkaline pH. This effect was explained by electrostatic swelling of the nanoparticles. Measurements of ζ-potentials in the wide pH range showed the presence of acidic groups with a pK a of 8.6; the value of the surface charge at the conditions of maximal deprotonation of these groups was estimated to be ∼70 mC/m2. Changes in the optical spectra of PThBA NPs due to variations in pH and additions of organic solvents indicate transformations between twisted and planar conformations of the polymer backbone. The binding of saccharides by PThBA NPs resulted in a decrease in the size and charge of the nanoparticles. Recently developed wide-field surface plasmon resonance microscopy (WF-SPRM) can simultaneously monitor every single nanoparticle among many thousands adsorbed on a surface. It was used for the first time to study chemosensitive nanoparticles. The described above effects of pH change and saccharide binding described above, monitor were confirmed by using integral techniques in monitoring individual nanoparticles, by WF-SPRM. The pH effects were shown to be reversible. An increase in the affinity of PThBA NPs for saccharides at a more alkaline pH was also observed. A fast recovery of polymer binding sites by a pH decrease was demonstrated. The synthesized and characterized PThBA NPs can be further used for various purposes including analytical assays, chemical sensors, or chemosensitive nanotechnological devices.

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Nanosensors

Cited by 10 publications

References 145 publications

Development of an inkjet-printed electrochemical nanosensor for ascorbic acid detection

Development of an inkjet-printed electrochemical nanosensor for ascorbic acid detection

Structural and physicochemical characteristics of one-step PAMAM dendrimeric nanoparticles

Poly-3-thienylboronic Acid Nanoparticles: Synthesis, Characterization, and Interaction with Saccharides Studied at the Level of Individual Nanoparticles

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