- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Aminoboronic acid-functionalized graphitic carbon nitride quantum dots for the photoluminescence multi-chemical sensing probe
摘要： This paper reports a highly sensitive photoluminescence glucose sensor based on aminoboronic acid-functionalized carbon nitride quantum dots (g-CNQDs/3APBA) fabricated using melamine and 3-aminophenylboronic acid via a facile two-step synthesis process. By introducing the covalent bonds between g-CNQDs and boronic acid groups, it can be effectively used as “on-off-on” based multi-chemical sensor. The g-CNQDs/3APBA exhibited quantum yields (QYs) as high as 78.5%, which is the highest QYs among fluorescence sensors based on g-CNQDs reported thus far. The material showed a wide linear range of 0 – 10 mM and a detection limit as low as 42 nM with excellent selectivity. In addition, it exhibited comparable performance compared to those of a commercial glucometer in a real blood test. Owing to the excellent bio-imaging properties and low cytotoxicity, g-CNQDs/3APBA is a promising candidate as a sensing material for biomedical and clinical applications.
关键词： quantum dots,glucose sensor,multi-chemical sensor,fluorescence,Graphitic carbon nitride,3-aminophenylboronic acid
更新于2025-11-20 15:33:11
-
Non-enzymatic sensing of dopamine by localized surface plasmon resonance using carbon dots-functionalized gold nanoparticles
摘要： A highly selective, sensitive, and rapid colorimetric sensor for the determination of dopamine (DA) was developed using the color change of S-doped carbon dots functionalized gold nanoparticles (S-CDs@Au NPs). The base of the method is the formation of a complex between the amine groups of dopamine with carboxylic groups of S-CDs@Au NPs followed by their aggregation with Fe3+ ions which acts as the linkers causing a red shift from 520 to 670 nm in the localized surface plasmon peak of S-CDs@Au NPs. The ratio of absorbance intensity at 670 nm to 520 nm was monitored as the analytical signal for determination of dopamine. The parameters affecting the analytical signal including reaction time, solution pH, the concentration of Au NPs and concentration of Fe3+ were optimized. At optimized conditions, the calibration curve was linear in the concentration range of 0.81-16.80 μM of dopamine. The detection and quantification limits were 0.23 μM and 0.77 μM, respectively. The intra-day and inter-day relative standard deviation (RSDs) at 5.0 μM of DA were 3.9% and 5.6%, respectively (n = 5). The applicability of the method for determination of DA in dopamine ampoule, urine and serum human samples was investigated.
关键词： Carbon dots,Localized surface plasmon resonance,Colorimetric chemical sensor,Dopamine,Gold nanoparticles
更新于2025-11-14 15:18:02
-
Hydrazine Exposé: The Next-Generation Fluorescent Probe
摘要： Hydrazine (N2H4) is one of the most important pnictogen hydride chemicals, and is utilized within a wide spectrum of industries. As a result of its extensive use, hydrazine’s monitoring methods have constantly come under fire due to its potential health risk and the subsequent environmental pollution. Fluorometric molecular sensing systems generally report with a major emphasis on the merit of fluorescence analysis. What we are proposing within this report is a next-generation fluorescent probe that allows hydrazine to become fully traceable, within multifarious environments that show fast and intuitional fluorescence transformation. A new sensing moiety, ortho-methoxy-methyl-ether (o-OMOM) incorporated electron donor (D)–acceptor (A) type naphthaldehyde provides high selectivity and sensitivity amidst its superiority within practical applications for sensing hydrazine. The new probe overcomes most of the drawbacks of currently used fluorescent probes, and due to its successful demonstrations, such as real-time spray-based sensing, soil analysis, and two-photon tissue imaging, its potential for practical application is beyond reproach.
关键词： fluorescent probe,chemical sensor,hydrazine,hydrazone-formation,two-photon tissue imaging
更新于2025-09-23 15:22:29
-
A metamaterials-loaded quarter mode SIW microfluidic sensor for microliter liquid characterization
摘要： In this paper, a two concentric complementary split-ring resonators (CSRRs) loaded quarter mode substrate integrated waveguide (QMSIW) is proposed as a compact microfluidic chemical sensor for liquid characterization, demonstrated by the measurement of distilled (DI) water and ethanol liquid mixtures. The proposed sensor can detect the liquid concentration from the resonance frequency shift caused by the liquid sample flowing inside the microfluidic channel engraved on polydimethylsiloxane (PDMS). Its electrical size is only ?0.25λg. The simulated resonant frequency shifts between DI water and 100% ethanol is 1196 MHz (from 2.620 GHz to 3.816 GHz), while less than 6 μL samples are used. The experimental results have validated the possibility of the application of the proposed microfluidic structure as a chemical sensor.
关键词： micro?uidic sensor,Metamaterials,complementary split-ring resonator (CSRR),chemical sensor,substrate integrated waveguides (SIW)
更新于2025-09-23 15:21:21
-
Narrow resonance and ultrahigh sensitivity plasmonic waveguide refractive index sensor
摘要： A surface plasmon resonance optical refractive index sensor (for aqueous medium) with high angular and spectral sensitivities, S, very small full width at half maxima, w, (narrow resonance) and very high quality factor, χ=S/w, is proposed, which operates in both angular and spectral interrogation modes. The structure consists of a prism and a composite plasmonic waveguide consisting of a high index dielectic layer and a thin metal(Ag) film, separated by a low index layer. Above the metal film, the medium is analyte. It is shown that even with a prism of low index, the proposed sensor offers very small full width at half maxima (FWHM) of reflection spectra which improves the sensor performance. Numerically, an angular sensitivity of 168 degree/RIU and a quality factor, χ= 1680 could be achieved for the proposed configuration. Spectral sensitivity comes out to be 6000 nm/RIU.
关键词： Refractive index sensor,Aqueous medium,Surface Plasmon Resonance (SPR),Bio/Chemical sensor
更新于2025-09-23 15:19:57
-
N-donor ligand driven CdII-based coordination polymers: synthesis, structures and highly selective luminescence sensing for Fe3+ ions
摘要： Three CdII-based coordination polymers (CPs), formulated as [Cd2(dnpdc)3(DMSO)3·0.5H2O]n (1), [Cd(dnpdc)(bpee)] n (2) and {Cd(dnpdc)(bimb)·2H2O}n (3) have been successfully synthesized and structurally characterized. Compound 1 exhibits a 4-fold interpenetrated 3D diamond network based on dinuclear Cd2(OCO)3 cluster. Compound 2 features 3D frameworks constructed from the 2D [Cd(dnpdc)]n sheets pillared by 1D zig-zag shaped [Cd(bpee)]n chains. In compound 3, the mononuclear CdII units are mixed connected by the dnpdc2- and bimb ligands, yielding the 6-fold interpenetrated 3D diamond network. The fluorescence measurements reveal that three compounds exhibit intense blue emission in the solid state. In particular, compound 3 exhibits highly selective chemical sensing for Fe3+ ions in aqueous solution.
关键词： Coordination polymers,Fluorescent properties,Solvothermal reaction,Chemical sensor,Heterolinker strategy
更新于2025-09-19 17:15:36
-
Selective Wet-Etching of Polymer/Fullerene Blend Films for Surface- and Nanoscale Morphology-Controlled Organic Transistors and Sensitivity-Enhanced Gas Sensors
摘要： Surface and nanoscale morphology of thin poly(3-hexylthiophene) (P3HT) ?lms are e?ectively controlled by blending the polymer with a soluble derivative of fullerene, and then selectively dissolving out the fullerene from the blend ?lms. A combination of the polymer blending with fullerene and a use of diiodooctane (DIO) as a processing additive enhances the molecular ordering of P3HT through nanoscale phase separation, compared to the pristine P3HT. In organic thin-?lm transistors, such morphological changes in the blend induce a positive e?ect on the ?eld-e?ect mobility, as the mobility is ~5–7 times higher than in the pristine P3HT. Simple dipping of the blend ?lms in butyl acetate (BA) causes a selective dissolution of the small molecular component, resulting in a rough surface with nanoscale features of P3HT ?lms. Chemical sensors utilizing these morphological features show an enhanced sensitivity in detection of gas-phase ammonia, water, and ethanol.
关键词： selective etching process,morphology,polymer blend,chemical sensor,organic thin-?lm transistor
更新于2025-09-19 17:13:59
-
Self‐assembled core‐shell structured organic nanofibers fabricated by single‐nozzle electrospinning for highly sensitive ammonia sensors
摘要： Electrospinning is a unique method to prepare 1-dimentional nanofiber for large-scale manufacturing. Here in, we demonstrated chemical sensors based on the semiconducting nanofibers with core-shell structure by simple single-nozzle electrospinning with the spontaneous phase separation. The core-shell structure nanofiber has large active sites which make it highly sensitive to chemical analytes. The thickness of the sensing shell can be tuned by controlling the mass ratio of core and shell components. As a demonstration, the nanofiber-based sensor exhibits high sensitivity to low-concentration ammonia (ppb level), as well as stability and reversibility. This unique fast single-nozzle electrospinning technique used to fabricate semiconducting nanofibers with core-shell structure provides a facile and designable process for the integration of multifunctional organic semiconducting layer into the organic electronic system.
关键词： nanofiber,chemical sensor,core-shell structure,electrospinning
更新于2025-09-19 17:13:59
-
[IEEE 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Huangshan, China (2019.8.5-2019.8.8)] 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Microfiber coupler with a Sagnac loop for water pollution detection
摘要： A chloride ion sensor based on a microfiber coupler with a Sagnac loop is proposed. Experimental results show that the sensitivity reaches a maximum of 423 pm/‰ and that the detection limit for the chloride ion concentration is 0.447‰ at a wavelength of 1595 nm. The proposed sensor is characterized by simple and easy manufacturing process, compact structure and low cost. This sensing unit has great potential for application in marine chloride detection and environmental safety monitoring, especially for monitoring building corrosion and water pollution.
关键词： Microfiber coupler,Fiber optic chemical sensor,Water pollution
更新于2025-09-16 10:30:52
-
AIP Conference Proceedings [AIP Publishing SECOND INTERNATIONAL CONFERENCE ON MATERIAL SCIENCE, SMART STRUCTURES AND APPLICATIONS: ICMSS-2019 - Erode, India (21–22 November 2019)] SECOND INTERNATIONAL CONFERENCE ON MATERIAL SCIENCE, SMART STRUCTURES AND APPLICATIONS: ICMSS-2019 - Adopted octagonal photonic crystal fiber for analyte liquids sensing
摘要： In this paper, octagonal-photonic crystal fiber (O-PCF) has been proposed for studying liquid types for sensing applications. The propagation properties for the proposed O-PCF were studied numerically by utilizing full-vector finite element method (FV-FEM ) using COM SOL M ultiphysics version 5.1. The confinement loss, the relative sensitivity, and the nonlinearity coefficient can be controlled by changing the factors related with the geometry such as the cladding in a range of wavelength, air hole diameter, and the core pitch. The proposed O-PCF is realized with three rings from the air hole in the cladding and two circular rings in the core region. Numerical simulation of the proposed structure is achieving the highest sensitivity by increasing the diameter of the air hole the cladding, while the pitch remains constant. At the same time, the confinement losses have distinguishable decrease with an increase in diameter as well as an increase in the number of rings within the cladding layer. In addition, the effective area and the nonlinear coefficient each of them is affected with every hole of the diameter and with the type of the chemical material used. The proposed model shows that the fiber is of a high efficiency not only in the sensing application, but also being distinguishable with the nonlinear optical application.
关键词： chemical sensor,nonlinearity coefficient,O-PCF,Sensitivity,confinement loss
更新于2025-09-12 10:27:22