Quantum dots as self-referenced optical fibre temperature probes for luminescent chemical sensors

Jorge, P. A. S.; Mayeh, Mona; Benrashid, R.; Caldas, Paulo; Santos, J. L.; Farahi, Faramarz

doi:10.1088/0957-0233/17/5/s16

Cited by 57 publications

(45 citation statements)

References 25 publications

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“…8 In addition, recent works have demonstrated the ability of QDs to act as nano-thermometers based on the thermal sensitivity of their fluorescence bands. [9][10][11][12][13][14] Based on all these outstanding properties, QDs have been successfully used to mark specific receptors in cell membranes, to measure intracellular temperature, and to label living embryos at different stages. 9,[15][16][17] Most of the QD-based bio-images reported up to now were obtained by using either CdSe or CdTe QDs, since both are currently commercially available with a high degree of quality.…”

Section: Introductionmentioning

confidence: 99%

Optimum quantum dot size for highly efficient fluorescence bioimaging

Maestro¹,

Jacinto²,

Rocha³

et al. 2012

Journal of Applied Physics

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Semiconductor quantum dots of few nanometers have demonstrated a great potential for bioimaging. The size determines the emitted color, but it is also expected to play an important role in the image brightness. In this work, the size dependence of the fluorescence quantum yield of the highly thermal sensitive CdTe quantum dots has been systematically investigated by thermal lens spectroscopy. It has been found that an optimum quantum yield is reached for 3.8-nm quantum dots. The presence of this optimum size has been corroborated in both one-photon excited fluorescence experiments and two-photon fluorescence microscopy of dot-incubated cancer cells. Combination of quantum yield and fluorescence decay time measurements supports that the existence of this optimum size emerges from the interplay between the frequency-dependent radiative emission rate and the size-dependent coupling strength between bulk excitons and surface trapping states.

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Section: Introductionmentioning

confidence: 99%

Optimum quantum dot size for highly efficient fluorescence bioimaging

Maestro¹,

Jacinto²,

Rocha³

et al. 2012

Journal of Applied Physics

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“…These data can be approximated by an exponential signal with a correlation factor of R 2 = 0.998, rather better than the obtained absorption spectra measured in the precedent section. In some previous works [26][27][28]30], the sensors apparently showed a linear behavior due to the narrower temperature range used. The average sensitivity of this sensor is 0.00465…”

Section: Emission Studymentioning

confidence: 84%

“…The emission intensity decreases, and the emission bands move to higher wavelengths when temperature increases. Due to these features, QDs are an excellent material for temperature sensing [25][26][27][28].…”

Section: Methodsmentioning

confidence: 99%

“…To study the maximum of the quantum dots emission peaks, a normalization method applied by Jorge et al in a previous study [28] was utilized. It is based on taking two intensity signals (S 1 and S 2 ) corresponding to two 5 m spectral windows on opposite sides of the emission peak and applying a normalization according to (S 1 − S 2 )/(S 1 + S 2 ).…”

Section: Emission Studymentioning

confidence: 99%

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Photonic Crystal Fiber Temperature Sensor Based on Quantum Dot Nanocoatings

et al. 2009

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Quantum dot nanocoatings have been deposited by means of the Layer-by-Layer technique on the inner holes of Photonic Crystal Fibers (PCFs) for the fabrication of temperature sensors. The optical properties of these sensors including absorbance, intensity emission, wavelength of the emission band, and the full width at half maximum (FWHM) have been experimentally studied for a temperature range from −40 to 70• C.

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“…These semiconductor nanoparticles offer several advantages including narrow fluorescence emission, tunable wavelength, relatively high quantum yield, outstanding photo stability as well as flexible photo excitation. It also has been reported that the behavior of the luminescent properties of quantum dots with temperature has suitable characteristics for application as temperature probes [10][11][12][13][14][15]. The luminescence properties, such as the excited state lifetime, emission intensity, and peak wavelength, have been proven to be good indicators of temperature.…”

Section: Introductionmentioning

confidence: 99%

CdTe Quantum Dot Fluorescence Thermometry of Rolling Bearing

Yan¹,

Bai²

2018

Nonmagnetic and Magnetic Quantum Dots

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Temperature is one of the most important parameters affecting the service life and performance of a rolling element bearing component. In this paper, a nonintrusive method is developed to monitor the temperature variation of the inner raceway during bearing operation utilizing CdTe quantum dots as the temperature sensors. The CdTe quantum dots were synthesized and were used in constructing a sensor film by means of layer-bylayer electrostatic self-assembly method on an ultrathin glass slice. The peak wavelength shift of the fluorescence spectrum of the sensor film shows a linear and reversible relationship with temperature, and it is used to sense the temperature of the inner raceway. The resolution of the CdTe optothermal sensor is determined to be 0.14 nm/°C. The temperature measurement of rolling element bearing was conducted on a bearing test rig incorporated with an optical fiber fluorescence spectrum detecting system. To verify the accuracy of the temperature obtained by quantum dots sensor film, a thermocouple was used to test the temperature of the inner raceway right before and after the operation. Results show that the temperature obtained by the CdTe quantum dots film sensor is consistent with that by the thermocouple, with an error typically below 10% or smaller.

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Quantum dots as self-referenced optical fibre temperature probes for luminescent chemical sensors

Cited by 57 publications

References 25 publications

Optimum quantum dot size for highly efficient fluorescence bioimaging

Optimum quantum dot size for highly efficient fluorescence bioimaging

Photonic Crystal Fiber Temperature Sensor Based on Quantum Dot Nanocoatings

CdTe Quantum Dot Fluorescence Thermometry of Rolling Bearing

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