Characterisation of olive oil by an electronic nose based on conducting polymer sensors

Stella, Rita; Barisci, Joseph N.; Serra, Giorgio; Wallace, Gordon G.; Rossi, Danilo De

doi:10.1016/s0925-4005(99)00510-9

Cited by 100 publications

(39 citation statements)

References 13 publications

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“…The resistance change of the conducting polymer "bridges" is measured as a change in voltage across the sensor at a constant current. Since the 1984 report on the first electronic nose based on polypyrrole, similar conjugated conducting polymer sensor arrays have been constructed for testing and sensing a wide range of mixture systems, including the odor sensing for gases [46,47], recognition of spoilage bacteria and yeasts in milk [48], water quality control [49], identification of fruit cultivar [50], characterization of wines [51,52], and olive oil [53,54].…”

Section: Conducting Polymer "Electronic Noses"mentioning

confidence: 99%

Sensors and sensor arrays based on conjugated polymers and carbon nanotubes

Dai

Soundarrajan

Kim

2002

Pure and Applied Chemistry

187

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Abstract:The need for cheaper, faster, and more accurate measurements has been a driving force for the development of new sensing devices. As is well known, the electrical conductivity of conjugated polymers can be reliably regulated over a wide range through interactions with electron acceptors and donors. This, together with the fast optical dynamics (either in the ground or excited states) of most conjugated polymers, has made conjugated polymers very attractive as transducer-active materials. On the other hand, the unusual electronic, mechanical, and thermal properties of carbon nanotubes have also led to their potential use in a wide range of devices, including sensors. In particular, the ability of carbon nanotubes and their derivatives to operate as gas and glucose sensors has been recently demonstrated. This article provides a status review on the research and development of sensors and sensor arrays based on conjugated polymers and carbon nanotubes. The unique features characteristic of most reported sensing transduction modes related to conjugated polymers and carbon nanotubes are discussed, along with their pros and cons.

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Section: Conducting Polymer "Electronic Noses"mentioning

confidence: 99%

Sensors and sensor arrays based on conjugated polymers and carbon nanotubes

Dai

Soundarrajan

Kim

2002

Pure and Applied Chemistry

187

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“…"Electronic noses" offer a promising alternative, with the potential for continuous real-time monitoring and discrimination of large families of gases. These vapor analyzers are designed to mimic the olfactory system via the integration of sensor arrays (typically conducting polymer 14,15 or metal oxide 16 thin films) and pattern recognition algorithms. [15][16][17][18] The sensors are designed in a combinatorial fashion to yield varying responses to different analytes.…”

Section: Introductionmentioning

confidence: 99%

Peptide−Nanowire Hybrid Materials for Selective Sensing of Small Molecules

et al. 2008

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The development of a miniaturized sensing platform for the selective detection of chemical odorants could stimulate exciting scientific and technological opportunities. Oligopeptides are robust substrates for the selective recognition of a variety of chemical and biological species. Likewise, semiconducting nanowires are extremely sensitive gas sensors. Here we explore the possibilities and chemistries of linking peptides to silicon nanowire sensors for the selective detection of small molecules. The silica surface of the nanowires is passivated with peptides using amide coupling chemistry. The peptide/nanowire sensors can be designed, through the peptide sequence, to exhibit orthogonal responses to acetic acid and ammonia vapors, and can detect traces of these gases from "chemically camouflaged" mixtures. Through both theory and experiment, we find that this sensing selectivity arises from both acid/base reactivity and from molecular structure. These results provide a model platform for what can be achieved in terms of selective and sensitive "electronic noses."

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“…As a result of this sensitivity, conjugated polymers are promising as sensory materials (4,5); sensing may be accomplished by transducing and͞or amplifying physical or chemical changes into electrical, optical, or electrochemical signals. Conjugated polymers have been used to detect chemical species (chemosensors) (6), such as ions (7)(8)(9)(10)(11), gases (for example, trinitrotoluene) (6,(12)(13)(14), and other chemicals (15), or biomolecules such as proteins, antibodies (16)(17)(18)(19)(20)(21)(22)(23)(24)(25)(26)(27), and DNA (28-31), using electrical (13,15), chromic (7,8,(16)(17)(18)(19), electrochemical (7-9, 20-25, 28-31), photoluminescent (11,26), chemoluminescent (27), or gravimetric (14) responses.…”

mentioning

confidence: 99%

Biosensors from conjugated polyelectrolyte complexes

Wang

Gong

Heeger

et al. 2001

Proc. Natl. Acad. Sci. U.S.A.

284

192

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A charge neutral complex (CNC) was formed in aqueous solution by combining an orange light emitting anionic conjugated polyelectrolyte and a saturated cationic polyelectrolyte at a 1:1 ratio (per repeat unit). Photoluminescence (PL) from the CNC can be quenched by both the negatively charged dinitrophenol (DNP) derivative, (DNP-BS ؊ ), and positively charged methyl viologen (MV 2؉ ). Use of the CNC minimizes nonspecific interactions (which modify the PL) between conjugated polyelectrolytes and biopolymers. Quenching of the PL from the CNC by the DNP derivative and specific unquenching on addition of anti-DNP antibody (anti-DNP IgG) were observed. Thus, biosensing of the anti-DNP IgG was demonstrated.C onjugated polymers are a versatile class of organic materials that promise utility in a variety of applications ranging from antistatic coatings, electrodes, and transistors, to light-emitting diodes, large area displays, photodetectors, photovoltaic cells, and lasers (1-3). The electrical, optical, and electrochemical properties of conjugated polymers can be modified by chemical synthesis and are strongly affected by relatively small perturbations, including changes in temperature, solvent, or chemical environment. As a result of this sensitivity, conjugated polymers are promising as sensory materials (4, 5); sensing may be accomplished by transducing and͞or amplifying physical or chemical changes into electrical, optical, or electrochemical signals. Conjugated polymers have been used to detect chemical species (chemosensors) (6), such as ions (7-11), gases (for example, trinitrotoluene) (6,(12)(13)(14), and other chemicals (15), or biomolecules such as proteins, antibodies (16-27), and DNA (28-31), using electrical (13, 15), chromic (7, 8, 16-19), electrochemical (7-9, 20-25, 28-31), photoluminescent (11, 26), chemoluminescent (27), or gravimetric (14) responses.Contemporary biosensor and bioassay developments have focused on mimicking natural host-receptor (''lock-and-key'') interactions. ''Lock-and-key'' molecular recognition can be between enzyme and substrate, ligand and receptor, antibody and antigen, or between two strands of nucleic acids with complementary sequences. Although antibody-based ELISAs are widely used for detection of biological species with high sensitivity, these assays are relatively labor-intensive and timeconsuming (hours to days) and require two different antibodies of defined specificities to adequately detect the target molecule (potentially making them cumbersome to perform) (32). Additionally, the detection of small molecules using ELISA can seldom be accomplished because of the recognition of one epitope by both capture and detection antibodies. Therefore, competition assays have to be performed that are both less accurate and more time consuming.Biosensors based on conjugated polymers as sensory materials exhibit real-time response [electrochemical (20-25) or optical (16-19, 26)] to the ligand-receptor recognition event. The coupling of a recognition event to photoinduced electron...

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Characterisation of olive oil by an electronic nose based on conducting polymer sensors

Cited by 100 publications

References 13 publications

Sensors and sensor arrays based on conjugated polymers and carbon nanotubes

Sensors and sensor arrays based on conjugated polymers and carbon nanotubes

Peptide−Nanowire Hybrid Materials for Selective Sensing of Small Molecules

Biosensors from conjugated polyelectrolyte complexes

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