Optical Fiber Sensing Using Quantum Dots

Jorge, P. A. S.; Martins, Manuel A.; Trindade, Tito; Santos, José Lúıs; Farahi, Faramarz

doi:10.3390/s7123489

Cited by 114 publications

(66 citation statements)

References 168 publications

(180 reference statements)

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“…Semiconductor quantum dots (QDs) show better suited photoluminescence (PL) properties as sensitive media in luminescence based devices, compared to commonly used dyes [1][2][3][4][5]. The suited PL properties include broad absorption band, size tuneable spectral emission, higher photostability, and emission lifetime ranging between several hundreds of picosecond and tens of nanosecond [6].…”

Section: Introductionmentioning

confidence: 99%

Chemical Sensitivity of Luminescent Epitaxial Surface InP Quantum Dots

Angelis¹,

Casalboni²,

Colantoni³

et al. 2013

JST

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Surface InP quantum dots grown by gas source molecular beam epitaxy on In 0.48 Ga 0.52 P buffer layer lattice matched to GaAs substrate shows a broad-band near-infrared photoluminescence ranging from 750 to 865 nm dependent on their dimensions. A reversible luminescence intensity enhancement has been observed when the quantum dots were exposed to vapours of different chemical solvents with the highest sensitivity for alcohol (methanol and ethanol) vapours. The luminescent behaviour is dependent on the solvent type and concentration. The peak energy and band shape of the luminescence are not affected by the solvent vapour.

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Section: Introductionmentioning

confidence: 99%

Chemical Sensitivity of Luminescent Epitaxial Surface InP Quantum Dots

Angelis¹,

Casalboni²,

Colantoni³

et al. 2013

JST

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show abstract

“…The unique optical properties of QDs, such as the particle-size dependent luminescence, high efficiency, narrow fluorescence emission band, broad absorption spectrum and high photostability when compared to those of traditional molecular fluorophores, can provide new solutions to many of the problems associated with traditional luminescence sensors and are the promise for a completely new set of applications using different optical fiber configuration [71]. As an example, CdTe quantum dots of various sizes have been embedded in polymeric films using the Layer-by-Layer technique in order to obtain temperature sensors by means of different optical fiber configuration schemes.…”

Section: Fluorescent Sensorsmentioning

confidence: 99%

Nanostructured Materials in Optical Fiber Sensing

Hernáez¹

2013

TOOPTSJ

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This work comprehends a review of nanostructured materials employed in the fabrication of optical fiber sensors in the last years. The continuous advances in nanofabrication techniques have enabled to manipulate the matter precisely producing well defined nanostructurated coatings or repetitive patterns at nanoscale level. The interactions of light with these nano-organized materials or patterns at the nanoscale level enable to observe interesting phenomena, such as interferometry, fluorescence, absorbance, resonances and many others which can be exploited in the fabrication of sensing devices. A particular case consists of optical fiber sensors, where the light travelling through an optical fiber interacts with the sensitive layer. The properties of the sensitive layer, such as the organization, physical properties, chemical bounds etc. will determine the sensing characteristics of the final device. The utilization of some of the most common nanostructured materials, such as polymers, nanoparticles, metals, metal oxides or biological coatings are reviewed here.

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“…QDs are ultrasensitive colloidal nanocrystals with unique photophysical properties [112]. They offer advantages over molecular dyes by being brighter, resistant to photo bleaching and amenable to multiplexed detection [113].…”

Section: Indirect Optical Detectionmentioning

confidence: 99%

Trends and Perspectives in Immunosensors

2012

Antibodies Applications and New Developments

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Immunosensors are devices that comprise both a biomolecular recognition system, such as an antibody and its corresponding antigen, and a transducer to translate the high affinity and specific binding event into a physical signal.Antibodies are produced by an immunological response to the presence of a foreign substance called an antigen. Antibodies may be immobilised onto a variety of platforms including bulk planar surfaces and nanoparticles by either covalent or adsorption strategies. Different interfaces between the bio-components and the detector are available to monitor in 'real-time' the signal generated by biological interactions. The transducers detect, for example, the change in electron transfer, absorbance, fluorescence, refractive index, mass change or heat transfer as the antibody binds to the antigen of interest. Such analytical devices have allowed a wide range of analytes to be identified and quantified such as pathogens, toxins, environmental food contaminants and disease biomarkers.The demand for sensitive, rapid, 'on-site' techniques has taken advantage of the latest advances in microfluidics and nanotechnology. This chapter will highlight current trends in immobilisation, micro/nano-fluidics/ and transducers utilised. A number of examples outlining the exploitation of these elements in immunosensors and their successful applications will be described.

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Optical Fiber Sensing Using Quantum Dots

Cited by 114 publications

References 168 publications

Chemical Sensitivity of Luminescent Epitaxial Surface InP Quantum Dots

Chemical Sensitivity of Luminescent Epitaxial Surface InP Quantum Dots

Nanostructured Materials in Optical Fiber Sensing

Trends and Perspectives in Immunosensors

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