Determining the Optimized Layer-by-Layer Film Architecture With Dendrimer/Carbon Nanotubes for Field-Effect Sensors

Sousa, Marcos Antonio Moura de; Siqueira, José R.; Vercik, Andrés; Schöning, Michael J.; Oliveira, Osvaldo N.

doi:10.1109/jsen.2017.2653238

Cited by 9 publications

(10 citation statements)

References 30 publications

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“…Despite the pH values having the same average error range, the 3‐bilayer LbL film exhibited the highest pH sensitivity. This result agrees with a previous study, which reported the optimal number of bilayers for LbL films incorporated on EIS sensors …”

Section: Resultssupporting

confidence: 93%

“…In this sense, the studied system favors the 3‐bilayer EIS‐CoFe 2 O 4 sensor as an ideal arrangement involving the use of CoFe 2 O 4 nanocrystals complexed with PAMAM and PVP polyelectrolytes in a hybrid nanostructured film with enhanced performance for H 2 O 2 detection. These results corroborate with the morphological analysis evaluated from AFM images (see Figure ) and agree with a model previously reported, that indicates an amount of three bilayers for LbL‐nanostructured films as the ideal architecture for an optimized EIS sensor performance . Such behavior may correspond to the minimum resistance for ionic transport and may be directly correlated to the film morphology.…”

Section: Resultssupporting

confidence: 91%

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Hybrid Layer‐by‐Layer Film of Polyelectrolytes‐Embedded Catalytic CoFe₂O₄ Nanocrystals as Sensing Units in Capacitive Electrolyte‐Insulator‐Semiconductor Devices

Morais

Silva

Dantas

et al. 2019

Physica Status Solidi (a)

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Nanostructured materials have exhibited great potential applications in the field of (bio)sensing. In particular, the capacitive electrolyte‐insulator‐semiconductor (EIS) sensor is a suitable field‐effect device for integration of film‐based nanostructures as sensing units. In this study, the fabrication of a hybrid nanostructured film using the layer‐by‐layer (LbL) technique combining cobalt ferrite (CoFe2O4) nanocrystals complexed with poly(vinylpyrrolidone) (PVP) and embedded with a poly(amidoamine) (PAMAM) dendrimer is investigated. LbL films containing a PAMAM/PVP‐CoFe2O4 architecture with different bilayers are fabricated onto EIS chips of Al/p‐Si/SiO2. The morphology of the films is characterized by atomic force microscopy (AFM) and the sensing properties toward H2O2 detection are evaluated by capacitance–voltage (C/V) and constant capacitance (ConCap) measurements. By correlating the electrochemical and morphological properties of the films, the findings lead to an optimized system, in which the best performance is observed for a 3‐bilayer EIS‐(PAMAM/PVP‐CoFe2O4) sensor, exhibiting a sensitivity of ca. 26.5 mV decade−1 and limit of detection of ca. 157 × 10–6 m toward H2O2. The set‐up presents for the first time a field‐effect sensor for H2O2 detection as an alternative to conventional amperometric H2O2 sensors.

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Section: Resultssupporting

confidence: 93%

Section: Resultssupporting

confidence: 91%

Hybrid Layer‐by‐Layer Film of Polyelectrolytes‐Embedded Catalytic CoFe₂O₄ Nanocrystals as Sensing Units in Capacitive Electrolyte‐Insulator‐Semiconductor Devices

Morais

Silva

Dantas

et al. 2019

Physica Status Solidi (a)

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“…PAMAM dendrimers of up to 10 generations can be produced with narrow molecular weight distribution and a variety of functional terminal groups, which are convenient for further surface modifications or for synthesis of more complex structures. Because of their unique properties, PAMAM dendrimers have been used for numerous applications, such as drug and gene delivery, , biological imaging, catalysis, sensors, , gas separation, , and wastewater treatment. − Grafting PAMAM dendrimers on the surface of a preformed thin-film composite membrane has been reported to increase hydrophilicity and reduce roughness. As the PAMAM dendrimer generation increases, the hydrophilicity of PAMAM grafted polyamide layer increases and this may potentially enhance the membrane fouling resistance …”

Section: Introductionmentioning

confidence: 99%

Dendrimeric Thin-Film Composite Membranes: Free Volume, Roughness, and Fouling Resistance

Duong

Zuo

Nunes

2017

Ind. Eng. Chem. Res.

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Copolyamide films with a thickness from 50 to 780 nm were fabricated by interfacial polymerization between mixtures of m-phenylene diamine and primary amine-terminated polyamidoamine dendrimers (PAMAM) in the aqueous phase and trimesoyl chloride (TMC) in the organic phase. Different PAMAM generations (G0, d = 15 Å, Z = 4; G3, d = 36 Å, Z = 32; and G5, d = 54, Z = 128, where d is the measured diameter and Z is the number of terminal groups) and concentrations were used to obtain copolyamide films with different crosslinked structures. The influences of the concentration and degree of branching (PAMAM generation) on free volume were analysed via positon annihilation spectroscopy (PAS) and correlated with the separation properties of copolyamide films. Besides, surface and intrinsic properties of copolyamide films prepared under different conditions were compared. The high hydrophilicity of PAMAM in the copolyamide network leads to the formation of a hydration layer on the copolyamide surface, which minimizes fouling. The separation performance of copolyamide membranes with various PAMAM networks was investigated in forward osmosis (FO) experiments. Understanding the correlation between the PAMAM structure/concentration, free volume, thickness, and surface intrinsic properties leads to the design of suitable fouling resistant thin-film composite membranes in a single interfacial polymerization process.

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“…Based on previous reports from the current study's group, considering the use of amine‐functionalized polyelectrolytes (PAH and PANI:PAAMPSA) and a carbon‐based nanomaterial functionalized with carboxylic acid, the number of bilayers to fabricate the PAH:GO/PANI:PAAMPSA was set to five. [ 14,18–20,41,42 ]…”

Section: Methodsmentioning

confidence: 99%

“…Based on previous reports from the current study's group, considering the use of aminefunctionalized polyelectrolytes (PAH and PANI:PAAMPSA) and a carbon-based nanomaterial functionalized with carboxylic acid, the number of bilayers to fabricate the PAH:GO/PANI: PAAMPSA was set to five. [14,[18][19][20]41,42] The enzyme cocktail with urease was prepared by dissolving 30 mg of enzyme powder in 15 mL of 0.25 Â 10 À3 M polymix buffer solution, pH 7. Urea solutions were prepared at different concentrations ranging from 0.1 to 100 Â 10 À3 M in a 0.25 Â 10 À3 M polymix buffer solution, pH 8, containing 100 Â 10 À3 M of KCl.…”

Section: Lbl Film Preparation and Enzyme Immobilizationmentioning

confidence: 99%

Biosensor Based on Self‐Assembled Films of Graphene Oxide and Polyaniline Using a Field‐Effect Device Platform

Oliveira

Molinnus

Beging

et al. 2021

Physica Status Solidi (a)

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A new functionalization method to modify capacitive electrolyte–insulator–semiconductor (EIS) structures with nanofilms is presented. Layers of polyallylamine hydrochloride (PAH) and graphene oxide (GO) with the compound polyaniline:poly(2‐acrylamido‐2‐methyl‐1‐propanesulfonic acid) (PANI:PAAMPSA) are deposited onto a p‐Si/SiO2 chip using the layer‐by‐layer technique (LbL). Two different enzymes (urease and penicillinase) are separately immobilized on top of a five‐bilayer stack of the PAH:GO/PANI:PAAMPSA‐modified EIS chip, forming a biosensor for detection of urea and penicillin, respectively. Electrochemical characterization is performed by constant capacitance (ConCap) measurements, and the film morphology is characterized by atomic force microscopy (AFM) and scanning electron microscopy (SEM). An increase in the average sensitivity of the modified biosensors (EIS–nanofilm–enzyme) of around 15% is found in relation to sensors, only carrying the enzyme but without the nanofilm (EIS–enzyme). In this sense, the nanofilm acts as a stable bioreceptor onto the EIS chip improving the output signal in terms of sensitivity and stability.

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Determining the Optimized Layer-by-Layer Film Architecture With Dendrimer/Carbon Nanotubes for Field-Effect Sensors

Cited by 9 publications

References 30 publications

Hybrid Layer‐by‐Layer Film of Polyelectrolytes‐Embedded Catalytic CoFe₂O₄ Nanocrystals as Sensing Units in Capacitive Electrolyte‐Insulator‐Semiconductor Devices

Hybrid Layer‐by‐Layer Film of Polyelectrolytes‐Embedded Catalytic CoFe₂O₄ Nanocrystals as Sensing Units in Capacitive Electrolyte‐Insulator‐Semiconductor Devices

Dendrimeric Thin-Film Composite Membranes: Free Volume, Roughness, and Fouling Resistance

Biosensor Based on Self‐Assembled Films of Graphene Oxide and Polyaniline Using a Field‐Effect Device Platform

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Determining the Optimized Layer-by-Layer Film Architecture With Dendrimer/Carbon Nanotubes for Field-Effect Sensors

Cited by 9 publications

References 30 publications

Hybrid Layer‐by‐Layer Film of Polyelectrolytes‐Embedded Catalytic CoFe2O4 Nanocrystals as Sensing Units in Capacitive Electrolyte‐Insulator‐Semiconductor Devices

Hybrid Layer‐by‐Layer Film of Polyelectrolytes‐Embedded Catalytic CoFe2O4 Nanocrystals as Sensing Units in Capacitive Electrolyte‐Insulator‐Semiconductor Devices

Dendrimeric Thin-Film Composite Membranes: Free Volume, Roughness, and Fouling Resistance

Biosensor Based on Self‐Assembled Films of Graphene Oxide and Polyaniline Using a Field‐Effect Device Platform

Contact Info

Product

Resources

About

Hybrid Layer‐by‐Layer Film of Polyelectrolytes‐Embedded Catalytic CoFe₂O₄ Nanocrystals as Sensing Units in Capacitive Electrolyte‐Insulator‐Semiconductor Devices

Hybrid Layer‐by‐Layer Film of Polyelectrolytes‐Embedded Catalytic CoFe₂O₄ Nanocrystals as Sensing Units in Capacitive Electrolyte‐Insulator‐Semiconductor Devices