Ammonia vapor sensor based on CdSe/SiO2 core–shell nanoparticles embedded in sol–gel matrix

Sung, Ti Wen; Lo, Yu Lung

doi:10.1016/j.snb.2013.07.040

Cited by 48 publications

(13 citation statements)

References 40 publications

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“…(b)]. As shown in Figure , a linear fitting is used to fit the value of I 0 / I at 590 nm against the concentration of HCl ranging from 0 to 60 × 10 −5 M, which can be described by the Stern–Volmer equation

\frac{l_{0}}{I} = 1 + K_{SV} [Q]

where I 0 and I represented the absorbance intensity at 590 nm of the sensor before and after the addition of HCl, respectively.…”

Section: Resultsmentioning

confidence: 99%

Functionalization of poly(bis‐thiophene methine)s via facile C–C bulk polymerization and their application as chemosensors for acid detection

Peng

Pei

Huang

et al. 2018

J. Polym. Sci. Part A: Polym. Chem.

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Up to now, 3,4‐ethylenedioxythiophene (EDOT) or its modified analogs are indispensable units or subunits in all successful monomers for polythiophene synthesis through solid‐state polymerization (SSP). Here, a more open thiophene‐(CH(R))‐thiophene platform was developed successfully and corresponding poly(bis‐thiophene methine)s were obtained via C–C SSP or melt‐state polymerization (MSP), that is, bulk polymerization. Meanwhile, the observation of quite long effective Br–Br distance of 5.634 Å, which is more than 50% of halogen's double van der Waals radius (2rw), would help us to understand powerful capability of modulation of molecule movement and reaction under SSP. In addition, these polymers were further employed as acid sensors and they show highly sensitive response to HCl, MeSO3H, BF3‐OEt2, and HNO3. The detailed experiment reveals that P1 has the detection limit of 3.35 × 10−5 M for HCl. © 2018 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2018, 56, 1676–1683

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\frac{l_{0}}{I} = 1 + K_{SV} [Q]

where I 0 and I represented the absorbance intensity at 590 nm of the sensor before and after the addition of HCl, respectively.…”

Section: Resultsmentioning

confidence: 99%

Functionalization of poly(bis‐thiophene methine)s via facile C–C bulk polymerization and their application as chemosensors for acid detection

Peng

Pei

Huang

et al. 2018

J. Polym. Sci. Part A: Polym. Chem.

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“…Most of previous fluorescent sensors are based on the fluorescence quenching phenomena of the corresponding materials . However, the sensing properties of these quenching‐based sensors are still on the controversy, because the fluorescence tests of these QDs can be easily affected by the test conditions at various humidity and different temperature .…”

Section: Resultsmentioning

confidence: 99%

Dynamic Passivation in Perovskite Quantum Dots for Specific Ammonia Detection at Room Temperature

Huang

Hao

Song

et al. 2020

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Perovskite structured CsPbX3 (X = Cl, Br, or I) quantum dots (QDs) have attracted considerable interest in the past few years due to their excellent optoelectronic properties. Surface passivation is one of the main pathways to optimize the optoelectrical performance of perovskite QDs, in which the amino group plays an important role for the corresponding interaction between lead and halide. In this work, it is found that ammonia gas could dramatically increase photoluminescence of purified QDs and effectively passivate surface defects of perovskite QDs introduced during purification, which is a reversible process. This phenomenon makes perovskite QDs a kind of ideal candidate for detection of ammonia gas at room temperature. This QD film sensor displays specific recognition behavior toward ammonia gas due to its significant fluorescence enhancement, while depressed luminescence in case of other gases. The sensor, in turn‐on mode, shows a wide detection range from 25 to 350 ppm with a limit of detection as low as 8.85 ppm. Meanwhile, a fast response time of ≈10 s is achieved, and the recovery time is ≈30 s. The fully reversible, high sensitivity and selectivity characteristics make CsPbBr3 QDs ideal active materials for room‐temperature ammonia sensing.

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“…This result so far represents the lowest limit of detection of any optical ammonia sensor published in literature. Indeed, previous studies have shown limits of detection of 1.2 ppm by utilizing CdSe/SiO2 semi-conductor quantum dots [11] and 3 ppm by using a FRET between carbon nanodots and sodium rhodizonate [6].…”

Section: Resultsmentioning

confidence: 99%

Carbon Dots and Fluorescein: The Ideal FRET Pair for the Fabrication of a Precise and Fully Reversible Ammonia Sensor

Hsu

Hejazi

Armagan

et al. 2017

Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017

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Abstract:Monitoring of ammonia in the human breath is of paramount importance to monitor diseases link to liver and kidney mulfunctioning. The present paper describes a solid-state optical ammonia sensor based on Förster resonance energy transfer (FRET) between narrowly dispersed blue-emitting carbon nanodots (CNDs) as FRET donor and fluorescein as FRET acceptor. The fluorophores were physically entrapped in a close to superhydrophobic sol-gel matrix, in turn deposited on a PVDF-HFP electrospun fiber membrane. The sensor shows a linear calibration with a remarkably low limit of detection, i.e., 110 ppb, and adequate reproducibility up to six N2/NH3 cycles.

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Ammonia vapor sensor based on CdSe/SiO2 core–shell nanoparticles embedded in sol–gel matrix

Cited by 48 publications

References 40 publications

Functionalization of poly(bis‐thiophene methine)s via facile C–C bulk polymerization and their application as chemosensors for acid detection

Functionalization of poly(bis‐thiophene methine)s via facile C–C bulk polymerization and their application as chemosensors for acid detection

Dynamic Passivation in Perovskite Quantum Dots for Specific Ammonia Detection at Room Temperature

Carbon Dots and Fluorescein: The Ideal FRET Pair for the Fabrication of a Precise and Fully Reversible Ammonia Sensor

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