Highly Selective Optical Detection of Fe<sup>3+</sup> Ions in Aqueous Solution Using Label‐Free Silicon Nanocrystals

Linehan, Keith; Carolan, Darragh; Doyle, Hugh

doi:10.1002/ppsc.201900034

Cited by 6 publications

(4 citation statements)

References 63 publications

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“…The peak at around 960 cm −1 , observed in samples containing Si source, was attributed to the silanol groups (Si–OH bond) 25 . The peak at 1386 cm -1 was attributed to C-H bending modes in FSi1, FSi2, and FSi3 26 . Meanwhile, an additional peak of N–H was detected at 1580 cm -1 and a free C = O bond was observed at around 1701 cm -1 in the FSi1, FSi2, and FSi3 27 , 28 .…”

Section: Resultsmentioning

confidence: 99%

Development and characterization of novelly grown fire-resistant fungal fibers

Zhang

Fan

et al. 2022

Sci Rep

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This study conducted a comprehensive characterization and analyses on the fire-resistant behaviors of novel fungal fibers grown with substrate containing Silica (Si) source at multiple scales. At micro-scale, the results of SEM showed that silica affected the physiological activities of fungi, with the extent of effects depending upon its concentration. Fourier-transform infrared (FTIR) spectra displayed the existence of Si–O–C chemical bonds in fungal fibers grown with Si source, indicating that Si source becomes a part of the structure of fungal fibers. Thermogravimetric analysis (TGA) and Microscale combustion calorimetry (MCC) of fungal fibers exhibit an early thermal decomposition of non-combustible components, which will potentially help release the thermal stress and mitigation of spalling when used in concrete. Compared with polypropylene (PP) fibers, fungal fibers have a lower thermal degradation rate, a higher residual weight, a lower heat release peak temperature, and less total heat of combustion; all of these indicate improved thermal stability and fire resistance, and a lower rate of function loss in case of a fire. Additionally, the thermal stability and fire resistance of fungal fibers were improved with the increase of Si source concentration in the nutrition medium. For example, addition of 2% Si source in the feeding substrate leads to a 23.21% increase in residual weight in TGA, and a 23.66 W/g decrease in peak heat release rate as well as a 2.44 kJ/g reduction in total heat of combustion in MCC. At laboratory scale, compared with PP fibers, fungal fibers grown with 2% Si source have a higher residual weight of 40.40%, a higher ignition temperature of 200.50 °C, and a declined flame height of 11.64 mm in real fire scenarios. Furthermore, only in the fungal fibers grown with Si source, partial burning occurred. In post-fire conditions, the microstructure of residual char from fungal fibers grown with higher content of Si source became denser, which would lead to a reduction of the fuel vapor release and heat transfer. FTIR spectra of residual char demonstrated that fungal fibers grown with Si source formed more stable chemical bonds with higher heat of chemical bond formation, contributing to improved thermal stability and fire resistance. Therefore, compared with traditional fibers used for fiber reinforced concrete, incorporating the new natural grown fibers will potentially further improve the fire resistance of concrete and mitigate the concrete spalling.

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Section: Resultsmentioning

confidence: 99%

Development and characterization of novelly grown fire-resistant fungal fibers

Zhang

Fan

et al. 2022

Sci Rep

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“…SiQDs have also been used for imaging water flea embryos, as SiQDs were localised in the gut, yolk sac and eye lenses (D'Amora et al ., 2019). Furthermore, SiQD sensors have been developed for copper (LOD 0.008 μM; Zhao et al ., 2014) and iron (LOD 1.3 μM; Linehan, Carolan & Doyle, 2019), as well as for the pesticides carbaryl, parathion, diazinon and phorate (LOD 7.25 × 10 −3 μg/l, 3.25 × 10 −2 μg/l, 6.76 × 10 −2 μg/l and 0.19 μg/l, respectively; Yi et al ., 2013).…”

Section: Fluorescent Nanoparticles In Biological Researchmentioning

confidence: 99%

Fluorescent nanoparticles as tools in ecology and physiology

et al. 2021

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Fluorescent nanoparticles (FNPs) have been widely used in chemistry and medicine for decades, but their employment in biology is relatively recent. Past reviews on FNPs have focused on chemical, physical or medical uses, making the extrapolation to biological applications difficult. In biology, FNPs have largely been used for biosensing and molecular tracking. However, concerns over toxicity in early types of FNPs, such as cadmium-containing quantum dots (QDs), may have prevented wide adoption. Recent developments, especially in non-Cd-containing FNPs, have alleviated toxicity problems, facilitating the use of FNPs for addressing ecological, physiological and molecule-level processes in biological research. Standardised protocols from synthesis to application and interdisciplinary approaches are critical for establishing FNPs in the biologists' tool kit. Here, we present an introduction to FNPs, summarise their use in biological applications, and discuss technical issues such as data reliability and biocompatibility. We assess whether biological research can benefit from FNPs and suggest ways in which FNPs can be applied to answer questions in biology. We conclude that FNPs have a great potential for studying various biological processes, especially tracking, sensing and imaging in physiology and ecology.

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“…Compared with other QDs, silicon QDs (Si QDs) possess favorable biocompatibility [13] , eco-friendliness [28] , and earthabundance [29] , enabling efficient NIR emission at wavelengths below 1100 nm [30,31] . Thus, Si QDs represent a promising fluorescent nanosensor for detecting Fe 3+ .…”

Section: Introductionmentioning

confidence: 99%

A highly sensitive ratiometric near-infrared nanosensor based on erbium-hyperdoped silicon quantum dots for iron(Ⅲ) detection

Wang,

Lai,

et al. 2024

J. Semicond.

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Ratiometric fluorescent detection of iron(Ⅲ) (Fe3+) offers inherent self-calibration and contactless analytic capabilities. However, realizing a dual-emission near-infrared (NIR) nanosensor with a low limit of detection (LOD) is rather challenging. In this work, we report the synthesis of water-dispersible erbium-hyperdoped silicon quantum dots (Si QDs:Er), which emit NIR light at the wavelengths of 810 and 1540 nm. A dual-emission NIR nanosensor based on water-dispersible Si QDs:Er enables ratiometric Fe3+ detection with a very low LOD (0.06 μM). The effects of pH, recyclability, and the interplay between static and dynamic quenching mechanisms for Fe3+ detection have been systematically studied. In addition, we demonstrate that the nanosensor may be used to construct a sequential logic circuit with memory functions.

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Highly Selective Optical Detection of Fe³⁺ Ions in Aqueous Solution Using Label‐Free Silicon Nanocrystals

Cited by 6 publications

References 63 publications

Development and characterization of novelly grown fire-resistant fungal fibers

Development and characterization of novelly grown fire-resistant fungal fibers

Fluorescent nanoparticles as tools in ecology and physiology

A highly sensitive ratiometric near-infrared nanosensor based on erbium-hyperdoped silicon quantum dots for iron(Ⅲ) detection

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Highly Selective Optical Detection of Fe3+ Ions in Aqueous Solution Using Label‐Free Silicon Nanocrystals

Cited by 6 publications

References 63 publications

Development and characterization of novelly grown fire-resistant fungal fibers

Development and characterization of novelly grown fire-resistant fungal fibers

Fluorescent nanoparticles as tools in ecology and physiology

A highly sensitive ratiometric near-infrared nanosensor based on erbium-hyperdoped silicon quantum dots for iron(Ⅲ) detection

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Highly Selective Optical Detection of Fe³⁺ Ions in Aqueous Solution Using Label‐Free Silicon Nanocrystals