Highly pH-responsive sensor based on amplified spontaneous emission coupled to colorimetry

Zhang, Qi; Smirnov, José R. Castro; Xia, Ruidong; Pedrosa, José M.; Rodríguez, Isabel; Cabanillas‐González, Juan; Wei, Huang

doi:10.1038/srep46265

Cited by 5 publications

(3 citation statements)

References 28 publications

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“…To this aim, the optical gain properties of materials or their microstructure must be varied in a controlled fashion, and in such a way to effectively impact on the lasing spectrum or intensity while keeping sufficient light amplification and scattering. So far, the capability of modulating the optical gain properties, including amplified spontaneous emission (ASE) of organics has been achieved through various stimuli, including pH, [30] electric fields, [31] heat, and light. [32,33] Moreover, a few studies on thermo-responsive random lasers have been reported, exploiting sintered glass infiltrated with liquid crystals, [34] in which temperature is varied around the nematic-isotropic phase transition.…”

Section: Introductionmentioning

confidence: 99%

Optical Gain Switching by Thermo‐Responsive Light‐Emitting Nanofibers through Moisture Sorption Swelling

Archimi

Schoolaert

Becelaere

et al. 2023

Advanced Optical Materials

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The development of intelligent photonic systems made of stimuli‐responsive materials, i.e., with features tunable and switchable by environmental signals, is gaining increasing attention. Here, the study reports on switchable optical gain based on complex arrays of nanofibers made of thermo‐responsive poly(2‐n‐propyl‐2‐oxazoline), incorporating a blue‐emitting chromophore. The fluorescent component endows the nanofibers with optical gain in addition to the moisture absorption capability of the polymer. Light amplification is found with temperature‐ and humidity‐dependent excitation threshold. The threshold value is halved close to the polymer cloud point temperature, enabling reversible switching of the emission intensity upon temperature change. Waveguiding analysis by back‐focal plane imaging on individual fibers allows the switching mechanisms to be rationalized, in terms of moisture sorption swelling‐induced morphological changes. These responsive light‐emitting nanofibers may find application in a novel class of lasers with dynamically‐controlled properties, environmentally‐switchable optoelectronics, and smart sensors.

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Section: Introductionmentioning

confidence: 99%

Optical Gain Switching by Thermo‐Responsive Light‐Emitting Nanofibers through Moisture Sorption Swelling

Archimi

Schoolaert

Becelaere

et al. 2023

Advanced Optical Materials

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“…1331 complex, and not upgradable with fixed features, which limit their applications in all fields [12], [13]. The optical engineering for pH measurement continues to evolve from a classical way to a more sophisticated arrangement [14].…”

Section: Introductionmentioning

confidence: 99%

Optical absorbance of RGB LEDs in pH measurement of colorimetric solution with phenol red reagent

Dali

Azam

Rahman

et al. 2022

IJEECS

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The use of red, green, and blue ( RGB ) light-emitting-diode ( LED ) is a new trend in monochromatic colorimetric sensing due to cost-effective implementation. However, the application of RGB LED in pH measurement depends on the performance of the LED colour towards the colorimetric solution of interest, hence, needs to be evaluated. This work evaluated the performance of RGB LED for pH measurement system based on colorimetric approach using phenol red as a reagent. The main objective was to identify the LED colour with the best performance in terms of signal response and a bsorbance behavior. In this work, LED and photodiode were used as optical components and NI USB DAQ with LabView as the processing software. Four samples with known pH values were prepared and tested to obtain the voltage and absorbance behavior of each LED colour. Among all, the blue LED with wavelength ranged between 450 - 495 nm showed the best sensing behavior based on its linearity and error. Both voltage response and absorbance produced linear correlation with R 2=0.883 and R 2=0.9803, respectively. The significant finding from this study is useful in selecting the best RGB LED that is suitable for colorimetric pH measurement with phenol red as its colorimetric reagent.

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“…There has been extensive research on pH responsive materials for applications in drug delivery 62 and sensors 63 , and in the last two decades many researchers have developed pHresponsive membranes [64][65][66][67][68][69][70][71][72][73][74][75] . These membranes are highly desired because many chemical (Figure 1.10) 75 .…”

Section: Stimulus-responsive Membranes Ph-responsive Membranesmentioning

confidence: 99%

Development of epoxy nanofiltration membranes into smart materials for chemical separations

Gilmer¹

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Epoxy nanofiltration membranes were synthesized using a diamine and a diepoxide in a one-pot step polymerization. These membranes were stable in organic solvents and used for chemical separations in dichloromethane. The epoxy membranes showed excellent selectivities in chemical separations of over 100:1. The selectivity of the membrane was optimized by adding in a triepoxide to the polymerization to increase the cross-link density. Optimization of the membranes increased the selectivity up to 250:1 for select chemical separations. These epoxy membranes are some of the first nanofiltration membranes used in the separation of important fatty acids such as omega-3 fish oil fatty acid ethyl esters, and saturated fatty acid methyl esters. The epoxy membranes can separate eicosahexaenoic acid ethyl ester from docosahexenoic acid ethyl ester with selectivities up to 1.4:1. The selectivity of saturated fatty acid methyl esters with epoxy membranes were as high as 100:1 for the separation of methyl butyrate from methyl stearate. Epoxy membranes are also the first stimulus-responsive membranes with a disulfide-bond dependent mechanism. The labile disulfide bond is cleaved upon exposure to a chemical stimulus, which cleaves the cross-links within the membrane, and increases the pore size. The flux and selectivity of chemicals through the membrane was controlled before and after exposure to a chemical stimulus. The membranes were implemented in a multicomponent chemical separation to produce three-purity enriched fractions from a three-component mixture. The purity of chemicals improved from 33% up to 82%, with recovery yields as high as 88%. v PUBLIC ABSTRACT Chemical separations account for up to 15% of the global energy usage, and it is important for scientists to explore new technologies that can reduce the cost to purify chemicals. Membrane-based chemical separations are a greener separation technology when compared to the conventional separation techniques such as distillation and chromatography. This thesis describes the fabrication of new epoxy nanofiltration membranes that are highly selective in chemical separations, showing their ability to compete with conventional separation techniques. Epoxy membranes are also used in industrial relevant conditions and offer a potential solution for a multicomponent chemical separation, which is a challenging problem for current industrial membranes. vi

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Highly pH-responsive sensor based on amplified spontaneous emission coupled to colorimetry

Cited by 5 publications

References 28 publications

Optical Gain Switching by Thermo‐Responsive Light‐Emitting Nanofibers through Moisture Sorption Swelling

Optical Gain Switching by Thermo‐Responsive Light‐Emitting Nanofibers through Moisture Sorption Swelling

Optical absorbance of RGB LEDs in pH measurement of colorimetric solution with phenol red reagent

Development of epoxy nanofiltration membranes into smart materials for chemical separations

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