Polymer thin films embedded with metal nanoparticles for electrochemical biosensors applications

Prakash, S.; Chakrabarty, Tina; Singh, Ajay; Shahi, Vinod K.

doi:10.1016/j.bios.2012.09.031

Cited by 182 publications

(91 citation statements)

References 123 publications

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“…Organic thin film materials have many potential and implemented applications, from biocompatible and antifouling coatings in medical devices to protective coatings, waveguides and component materials in optoelectronic devices, such as flexible organic electroluminescent devices (OLED), organic photovoltaics (OPV) and organic thin film transistors (OTFT) [1][2][3][4][5][6]. The motivation for using organic materials stems from their chemical versatility, low cost, low temperature fabrication and ability for reel-to-reel printing, as well as mechanical flexibility [1].…”

Section: Introductionmentioning

confidence: 99%

Wetting, Solubility and Chemical Characteristics of Plasma-Polymerized 1-Isopropyl-4-Methyl-1,4-Cyclohexadiene Thin Films

et al. 2014

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Investigations on the wetting, solubility and chemical composition of plasma polymer thin films provide an insight into the feasibility of implementing these polymeric materials in organic electronics, particularly where wet solution processing is involved. In this study, thin films were prepared from 1-isopropyl-4-methyl-1,4-cyclohexadiene (γ-Terpinene) using radio frequency (RF) plasma polymerization. FTIR showed the polymers to be structurally dissimilar to the original monomer and highly cross-linked, where the loss of original functional groups and the degree of cross-linking increased with deposition power. The polymer surfaces were hydrocarbon-rich, with oxygen present in the form of O-H and C=O functional groups. The oxygen content decreased with deposition power, with films becoming more hydrophobic and, thus, less wettable. The advancing and receding contact angles were investigated, and the water advancing contact angle was found to increase from 63.14° to 73.53° for thin films prepared with an RF power of 10 W to 75 W. The wetting envelopes for the surfaces were constructed to enable the prediction of the surfaces' wettability for other solvents. The effect of roughness on the wetting behaviour of the films was insignificant. The polymers were determined to resist solubilization in solvents commonly used in the deposition of organic semiconducting layers, including chloroform and chlorobenzene, with higher stability observed in films fabricated at higher RF power. OPEN ACCESSCoatings 2014, 4 528

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Section: Introductionmentioning

confidence: 99%

Wetting, Solubility and Chemical Characteristics of Plasma-Polymerized 1-Isopropyl-4-Methyl-1,4-Cyclohexadiene Thin Films

et al. 2014

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“…In these conditions, the produced material can be used as microenvironment to electroimmobilize at − 1.5 V several materials such as metallic nanoparticles and enzymes onto different surfaces due to its suitable biocompatibility and cross-linking ability [14,25,28,20,41].…”

Section: Concentration Ratio Of Aunps and Chitosan In The Composite Mmentioning

confidence: 99%

“…CS can be cross-linked with nanomaterials [9,20,24,29], inorganic complexes [30], and biological elements [20,31], and used as support for blends with other polymers [32]. CS has excellent membrane-forming ability, high permeability towards water, good adhesion and biocompatibility providing a suitable microenvironment for electroimmobilization of biomolecules on different working surfaces [14,29,33]. However, CS has as main disadvantage to act as an insulator, which hinders the charge-transfer process.…”

Section: Introductionmentioning

confidence: 99%

“…In this perspective, the biosensing of environmental pollutants, particularly agrochemicals, using enzymes as biorecognition element has increased pronouncedly in the last years [1,[9][10][11][12][13][14]. Still, many of these devices need to improve their performance because of the low maximum residue limits (MRLs) established worldwide for pesticides [15,16].…”

Section: Introductionmentioning

confidence: 99%

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Sensitive bi-enzymatic biosensor based on polyphenoloxidases–gold nanoparticles–chitosan hybrid film–graphene doped carbon paste electrode for carbamates detection

Oliveira

Barroso

Araújo

et al. 2014

Bioelectrochemistry

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A bi-enzymatic biosensor (LACC-TYR-AuNPs-CS/GPE) for carbamates was prepared in a single step by electro-deposition of a hybrid film onto a graphene doped carbon paste electrode (GPE). Graphene and the gold nanopar-ticles (AuNPs) were morphologically characterized by transmission electron microscopy, X-ray photoelectron spectroscopy, dynamic light scattering and laser Doppler velocimetry. The electrodeposited hybrid film was composed of laccase (LACC), tyrosinase (TYR) and AuNPs entrapped in a chitosan (CS) polymeric matrix. Exper-imental parameters, namely graphene redox state, AuNPs:CS ratio, enzymes concentration, pH and inhibition time were evaluated. LACC-TYR-AuNPs-CS/GPE exhibited an improved Michaelis-Menten kinetic constant (26.9 ± 0.5 M) when compared with LACC-AuNPs-CS/GPE (37.8 ± 0.2 M) and TYR-AuNPs-CS/GPE (52.3 ± 0.4 M). Using 4-aminophenol as substrate at pH 5.5, the device presented wide linear ranges, low detection limits (1.68 × 10 −9 ± 1.18× 10 −10 -2.15 × 10 −7 ± 3.41 × 10 −9 M), high accuracy, sensitivity (1.13 × 10 6 ± 8.11 × 10 4 -2.19 × 10 8 ± 2.51× 10 7 %inhibition M −1 ), repeatability (1.2-5.8% RSD), reproducibility (3.2-6.5% RSD) and stability (ca. twenty days) to determine carbaryl, formetanate hydrochloride, propoxur and ziram in citrus fruits based on their inhibitory capacity on the polyphenoloxidases activity. Recoveries at two fortified levels ranged from 93.8 ± 0.3% (lemon) to 97.8 ± 0.3% (orange). Glucose, citric acid and ascorbic acid do not interfere signifi-cantly in the electroanalysis. The proposed electroanalytical procedure can be a promising tool for food safety control.

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“…Prakash et al [21] discussed applying nanoparticles to achieve an adequate sensitivity and stability with the modification of the sensors (or biosensors) with nanomaterials such as gold and/or silver nanoparticles [6,22,23], carbon nanomaterials [24,25] and silica nanoparticles [26] and these have shown considerable promise. Putzbach et al reported that the immobilization of enzymes improves stability of the biosensor discussed [27].…”

Section: Introductionmentioning

confidence: 99%

Optical sensor for pH monitoring using a layer-by-layer deposition technique emphasizing enhanced stability and re-usability

Raoufi

Surre

Rajarajan

et al. 2014

Sensors and Actuators B: Chemical

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Polymer thin films embedded with metal nanoparticles for electrochemical biosensors applications

Cited by 182 publications

References 123 publications

Wetting, Solubility and Chemical Characteristics of Plasma-Polymerized 1-Isopropyl-4-Methyl-1,4-Cyclohexadiene Thin Films

Wetting, Solubility and Chemical Characteristics of Plasma-Polymerized 1-Isopropyl-4-Methyl-1,4-Cyclohexadiene Thin Films

Sensitive bi-enzymatic biosensor based on polyphenoloxidases–gold nanoparticles–chitosan hybrid film–graphene doped carbon paste electrode for carbamates detection

Optical sensor for pH monitoring using a layer-by-layer deposition technique emphasizing enhanced stability and re-usability

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