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Development and Application of Chemosensors

A special issue of Sensors (ISSN 1424-8220). This special issue belongs to the section "Chemical Sensors".

Deadline for manuscript submissions: closed (31 December 2020) | Viewed by 15002

Special Issue Editors


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Guest Editor
Faculty of Medicine, Sofia University “St. Kliment Ohridski”, 1407 Sofia, Bulgaria
Interests: sensors; 1,8-naphthalimides; dendrimers; polymers; dye chemistry; fluorescence; photophysics; environmental protection
Special Issues, Collections and Topics in MDPI journals

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Guest Editor
Institute of Science and Technology of Polymers, ICTR-CSIC, 28006 Madrid, Spain
Interests: functional polymers; fluorescent sensors; polymer materials for biological applications; coatings; photopolymerization

Special Issue Information

Dear Colleagues,

Protection of the environment is a principle task of modern society. The analysis of air pollutants of different origins as well as the determination of sources of soil and water contaminants has challenged scientists around the globe. A number of scientific laboratories have been engaged to develop new detectors to expose the pollutants. This has prompted the development of molecular devices capable of performing sensor functions such as light-sensitive fluorosensors reacting via changes in fluorescence emission. Fluorosensors operating on the principle of photo-induced electron transport haven gained major scientific interest because in the presence of an analyte their emission can be selectively turned “on” or “off”. Changes in the photophysical characteristics of the fluorophore fragment occur as a result of the above interaction. Since the interaction runs at the molecular level, extremely low analyte concentrations can be detected using this, apparently, highly efficient method.

The aim of this Special Issue in the journal Sensors is to summarize the progress and advances in the development of new sensor systems. 

We would like to invite you to submit a contribution to this Special Issue presenting your recent research This can be done as an article, review or brief communication that reveals new trends in the development of sensor systems.

Topics of interest include but are not limited to:

  • Syntesis of novel compounds with sensor properies
  • Action mechanism(s) of sensor systems
  • Application of sensors
  • Polymer sensors
  • Dendrimers having sensor properies
  • Solid state sensors
  • Textile sensors
  • Colorimetric sensors

Looking forward to your submission(s) to the Sensors Special Issue

Best regards.

Prof. Dr. Ivo Grabchev
Dr. Paula Bosch
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Sensors is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Environment contaminants
  • Metal ions and protons
  • Homogeneous sensors
  • Heterogeneous sensors
  • Fluorophores
  • Fluorescent dendrimers
  • Fluorescent polymers
  • Modified textile
  • Colorimetry
  • Detection

Published Papers (5 papers)

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Research

15 pages, 9178 KiB  
Article
Ratiometric Detection of Mercury (II) Ions in Living Cells Using Fluorescent Probe Based on Bis(styryl) Dye and Azadithia-15-Crown-5 Ether Receptor
by Pavel A. Panchenko, Anastasija V. Efremenko, Alexey V. Feofanov, Mariya A. Ustimova, Yuri V. Fedorov and Olga A. Fedorova
Sensors 2021, 21(2), 470; https://doi.org/10.3390/s21020470 - 11 Jan 2021
Cited by 7 | Viewed by 3007
Abstract
Bis(styryl) dye 1 bearing N-phenylazadithia-15-crown-5 ether receptor has been evaluated as a ratiometric fluorescent chemosensor for mercury (II) ions in living cells. In aqueous solution, probe 1 selectively responds to the presence of Hg2+ via the changes in the emission intensity [...] Read more.
Bis(styryl) dye 1 bearing N-phenylazadithia-15-crown-5 ether receptor has been evaluated as a ratiometric fluorescent chemosensor for mercury (II) ions in living cells. In aqueous solution, probe 1 selectively responds to the presence of Hg2+ via the changes in the emission intensity as well as in the emission band shape, which is a result of formation of the complex with 1:1 metal to ligand ratio (dissociation constant 0.56 ± 0.15 µM). The sensing mechanism is based on the interplay between the RET (resonance energy transfer) and ICT (intramolecular charge transfer) interactions occurring upon the UV/Vis (380 or 405 nm) photoexcitation of both styryl chromophores in probe 1. Bio-imaging studies revealed that the yellow (500–600 nm) to red (600–730 nm) fluorescence intensity ratio decreased from 4.4 ± 0.2 to 1.43 ± 0.10 when cells were exposed to increasing concentration of mercury (II) ions enabling ratiometric quantification of intracellular Hg2+ concentration in the 37 nM–1 μM range. Full article
(This article belongs to the Special Issue Development and Application of Chemosensors)
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14 pages, 3387 KiB  
Article
Synthesis, Photophysical Characterization, and Sensor Activity of New 1,8-Naphthalimide Derivatives
by Stanislava Yordanova-Tomova, Diana Cheshmedzhieva, Stanimir Stoyanov, Todor Dudev and Ivo Grabchev
Sensors 2020, 20(14), 3892; https://doi.org/10.3390/s20143892 - 13 Jul 2020
Cited by 6 | Viewed by 2299
Abstract
Three new 1,8-naphthalimide derivatives M1M3 with different substituents at the C-4 position have been synthesized and characterized. Their photophysical properties have been investigated in organic solvents of different polarity, and their fluorescence intensity was found to depend strongly on both the [...] Read more.
Three new 1,8-naphthalimide derivatives M1M3 with different substituents at the C-4 position have been synthesized and characterized. Their photophysical properties have been investigated in organic solvents of different polarity, and their fluorescence intensity was found to depend strongly on both the polarity of the solvents and the type of substituent at C-4. For compounds M1 and M2 having a tertiary amino group linked via an ethylene bridge to the chromophore system, high quantum yield was observed only in non-polar media, whereas for compound M3, the quantum efficiency did not depend on the medium polarity. The effect of different metal ions (Ag+, Ba2+, Cu2+, Co2+, Mg2+, Pb2+, Sr2+, Fe3+, and Sn2+) on the fluorescence emission of compounds M1 and M2 was investigated. A significant enhancement has been observed in the presence of Ag+, Pb2+, Sn2+, Co2+, Fe3+, as this effect is expressed more preferably in the case of M2. Both compounds have shown significant pH dependence, as the fluorescence intensity was low in alkaline medium and has been enhanced more than 20-fold in acidic medium. The metal ions and pH do not affect the fluorescence intensity of M3. Density-functional theory (DFT) and Time-dependent density-functional theory (TDDFT) quantum chemical calculations are employed in deciphering the intimate mechanism of sensor mechanism. The functional properties of M1 and M2 were compared with polyamidoamine (PAMAM) dendrimers of different generations modified with 1,8-naphthalimide. Full article
(This article belongs to the Special Issue Development and Application of Chemosensors)
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18 pages, 5852 KiB  
Article
Spectral Characteristics and Sensor Ability of a New 1,8-Naphthalimide and Its Copolymer with Styrene
by Desislava Staneva, Silvia Angelova and Ivo Grabchev
Sensors 2020, 20(12), 3501; https://doi.org/10.3390/s20123501 - 21 Jun 2020
Cited by 3 | Viewed by 2462
Abstract
In this study, a novel 6-(allylamino)-2-(2-(dimethylamino)ethyl)-1H-benzo[de]isoquinoline-1,3(2H)-dione (NI3) was synthesized and characterized. Its copolymer with styrene was also obtained. The photophysical characteristics of NI3 were investigated in organic solvents and the results were compared with those of its structural analogue, 2-allyl-6-((2-(dimethylamino)ethyl)amino)-1H-benzo[de]isoquinoline-1,3(2H)-dione (NI4). The influences [...] Read more.
In this study, a novel 6-(allylamino)-2-(2-(dimethylamino)ethyl)-1H-benzo[de]isoquinoline-1,3(2H)-dione (NI3) was synthesized and characterized. Its copolymer with styrene was also obtained. The photophysical characteristics of NI3 were investigated in organic solvents and the results were compared with those of its structural analogue, 2-allyl-6-((2-(dimethylamino)ethyl)amino)-1H-benzo[de]isoquinoline-1,3(2H)-dione (NI4). The influences of the pH in the medium and different metal ions on the fluorescent intensity of monomers and polymers were also investigated. Computational tools (DFT and TDDFT calculations) were employed when studying the structure and properties of the 1,8-naphthalimide-based chromophores. Although the position of the N,N-dimethylaminoethylamine receptor fragment did not significantly impact proton detection, it was still important for detecting metal ion sensor ability, especially for monomeric 1,8-naphthalimide structures and their copolymers with styrene. Full article
(This article belongs to the Special Issue Development and Application of Chemosensors)
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13 pages, 4969 KiB  
Article
Design and Verification of Humidity Sensors Based on Magnesium Oxide Micro-Arc Oxidation Film Layers
by Mingqiang Pan, Jun Sheng, Jizhu Liu, Zeming Shi and Lei Jiu
Sensors 2020, 20(6), 1736; https://doi.org/10.3390/s20061736 - 20 Mar 2020
Cited by 16 | Viewed by 3157
Abstract
Humidity detection range is an important indicator for measuring the performance of humidity sensors, but semiconductor humidity sensors often face the problems of narrow detection ranges and insufficient detection sensitivities. In this paper, a magnesium oxide (MgO) humidity sensor based on micro-arc oxidation [...] Read more.
Humidity detection range is an important indicator for measuring the performance of humidity sensors, but semiconductor humidity sensors often face the problems of narrow detection ranges and insufficient detection sensitivities. In this paper, a magnesium oxide (MgO) humidity sensor based on micro-arc oxidation (MAO) technology was designed to solve these problems by simultaneously using impedance and capacitance as the response signals, as well as by normalizing the output of the two signals. The experimental results showed that the average output of the micro-arc MgO ceramic film, with impedance as the response signal, could reach 150 in the low relative humidity(RH) range (11.3–67% RH), which was much higher than its sensitivity in the high humidity range (< 1), and the film showed fast response (13 s) and recovery (61 s). Under high humidity conditions (67–97.3% RH), with capacitance as the response signal, the output of the micro-arc MgO was as high as 120. Therefore, the micro-arc MgO humidity sensor with impedance, and the sensor with capacitance as the response signal, demonstrated good stability in low humidity and in high humidity environments, respectively, indicating that the method of selecting appropriate response signals for different humidity environments can be applied to extend the humidity detection range of sensing material, and to improve the humidity detection capability of a sensor. Full article
(This article belongs to the Special Issue Development and Application of Chemosensors)
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15 pages, 3468 KiB  
Article
Ammonium Pyrrolidine Dithiocarbamate-Modified CdTe/CdS Quantum Dots as a Turn-on Fluorescent Sensor for Detection of Trace Cadmium Ions
by Yuan Yin, Qingliang Yang and Gang Liu
Sensors 2020, 20(1), 312; https://doi.org/10.3390/s20010312 - 6 Jan 2020
Cited by 4 | Viewed by 3318
Abstract
In this work, ammonium pyrrolidine dithiocarbamate (APDC) was used as a surface etchant to modify CdTe/CdS core-shell quantum dots (QDs). The APDC etchant combines with the cadmium ions (Cd2+) on the surface of the QDs, resulting in the formation of surface [...] Read more.
In this work, ammonium pyrrolidine dithiocarbamate (APDC) was used as a surface etchant to modify CdTe/CdS core-shell quantum dots (QDs). The APDC etchant combines with the cadmium ions (Cd2+) on the surface of the QDs, resulting in the formation of surface holes. The formation of these holes changes the QD surface structure, which leads to fluorescence quenching of the QDs. Newly added Cd2+ can selectively recognize and combine with these holes; thus, the fluorescence intensity of the QDs can be restored. The linear response of this turn-on fluorescent sensor was found to be 0–100 μg/L and 100–600 μg/L under the determined optimal conditions, and its limit of detection (LOD) for Cd2+ was 2.642 μg/L (23.5 nmol/L). Full article
(This article belongs to the Special Issue Development and Application of Chemosensors)
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