TALANTA
·
2019
·
IF 4.916
Nadia A. Samak,Mohamed S. Selim,Zhifeng Hao,Jianmin Xing
Hydrogen sulfide (H 2 S) is a toxic environmental pollutant and crucial gas-signaling agent of human physiology. There is an urgent need for developing a sensitive and selective detection approach for H 2 S. Herein, a novel turn off/on response approach using γ-Al 2 O 3 nanorods anchored on the surface graphene oxide (GO) nanosheets and coupled with DNA/sulfide fluorophore (SF) for H 2 S detection at room temperature was developed. The fluorescent fluorophore, DNA/SF, remains quenched on the super quencher γ-Al 2 O 3 –GO hybrid surface. In the existence of H 2 S, DNA/SF fluorophore was detached from γ-Al 2 O 3 –GO hybrid surface because of the strong physical adsorption interaction between H 2 S molecules and γ-Al 2 O 3 –GO surface. The recovered fluorescence intensity gave direct insight about H 2 S concentration in the medium. The developed γ-Al 2 O 3 –GO/DNA/SF nanobiosensor shows high sensitivity with 75 to 2.5 μM linear detection range of H 2 S, and a high binding constant of 9.8 × 10 3 M −1 . The nanobiosensor is very selective toward H 2 S in the presence of various interfering anions and thiols and used for H 2 S detection in real water samples. γ-Al 2 O 3 –GO/DNA/SF nanobiosensor provides a cheap, simple, and highly selective H 2 S detection method at room temperature.
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高影响因子
Catalysts
·
2019
·Vol. 10
·期 1
·6
·
IF 3.444
Jia Huang,Gang Nie,Yaobin Ding
To develop highly efficient heterogeneous photocatalysts for the activation of dissolved oxygen is very interesting in the field of green degradation of organic pollutants. In the paper, oxygen atom doped g-C3N4(O-g-C3N4) was prepared via a facile chemical oxidation of g-C3N4by peroxymonosulfate. X-ray photoelectron spectroscopy analysis suggests the oxidative treatment of g-C3N4by peroxymonosulfate evidently increased atomic percentage of oxygen on O-g-C3N4surface to 6.9% as compared with 1.8% for g-C3N4. Meanwhile, the doped oxygen atom mainly existed as carbonyl and carboxyl groups. Optical characterization indicates the introduction of oxygen improved the response of O-g-C3N4to visible light, and more obviously, separation of photo-generated h+-e−. 4-chloro-7-nitrobenzo-2-oxa-1,3-diazole (NBD-Cl) probe measurement indicates the formation of O2•−was dramatically enhanced through activation of dioxygen by photo-generated electrons in the O-g-C3N4photocatalytic system. Through high performance liquid chromatography (HPLC) and Liquid chromatography–mass spectrometry (LC-MS) analysis, it was found rhodamine B (RhB) photocatalytic degradation by O-g-C3N4followed step by step N-deethylation reaction pathways induced by the formed O2•−, rather than the non-selective decomposition of the chromophore in RhB by other radicals, such as hydroxyl radicals. This study provides a facile method to develop oxygen atom doped g-C3N4photocatalyst, and also clarifies its photocatalytic activation mechanism of molecular oxygen for N-deethylation reaction of RhB.Keywords:photocatalysis;oxygen doped g-C3N4;activation of dioxygen;superoxide radicals;selective N-deethylation of rhodamine B
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高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Wenwei Chen,Yixi Zhuang,Le Wang,Ying Lv,Jianbin Liu,Tian-Liang Zhou,Rong-Jun Xie
Luminescent metal–organic frameworks (MOFs) (typically dye-encapsulated MOFs) are considered as one kind of interesting downconversion materials for white-light-emitting diodes (LEDs), but their quantum efficiency (QE) is not sufficient and thus needs to be significantly enhanced for practical applications. In this study, we successfully synthesized a series of Rh@bio-MOF-1 (Rh = rhodamine) with an internal QE as high as ∼79% via a solvothermal reaction followed by cation exchanges. The high efficiency of the Rh@bio-MOF-1 composites was attributable to the high intrinsic luminescent efficiency of the selected Rh dyes, the confinement effect in the bio-MOF-1 host, and the uniform particle morphology. The emission maximum could be continuously tuned from 550 to 610 nm by controlling the species and concentration of encapsulated dye molecules, showing great color tunability of the dye-encapsulated MOFs. The emission lifetime of ∼7 ns was 1 or 2 magnitude orders shorter than that of Ce3+- or Eu2+-doped inorganic phosphors, allowing for visible light communication (VLC). White LEDs, fabricated by using the synthesized Rh@bio-MOF-1 composite and inorganic phosphors of green (Ba,Sr)2SiO4:Eu2+ and red CaAlSiN3:Eu2+, exhibited a high color rendering index of 80–94, a luminous efficacy of 94–156 lm/W, and an excellent stability in color point against drive current. The Rh@bio-MOF-1 composites with tunable colors, short emission lifetime, and high QE are expected to be used for smart white LEDs with multifunctions of both lighting and VLC.
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高影响因子
Advanced Science
·
2018
·Vol. 6
·期 2
·1801432
·
IF 12.441
Youshen Wu,Hui Zhang,Aizhao Pan,Qi Wang,Yanfeng Zhang,Guijiang Zhou,Ling He
Graphene quantum dot (GQD) encapsulated melamine-formaldehyde (MF) polymer microspheres with uniform particle size and tunable high-quality white-light emissions are prepared via a polymer-mediated GQD assembly and encapsulation strategy. In solution, GQDs are first aggregated with MF prepolymer through electrostatic interaction and further encapsulated inside the microspheres formed by polymerization of MF prepolymer under acid catalysis and heating. During this process, the aggregated GQDs are fixed in the MF polymer matrix with their emission extended from blue to full visible range, presenting bright white luminescence under ultraviolet excitation. The prepared white-light-emitting GQD-MF microspheres exhibit uniform morphology with an average particle size of 2.0 ± 0.08 µm and their luminescence properties are effectively regulated by the doping concentration of GQDs in the MF polymer matrix. A series of white-light-emitting GQD-MF microspheres with quantum yields from 0.83 to 0.43, Commission Internationale de L'Eclairage coordinates from (0.28, 0.28) to (0.33, 0.32), and color rendering index from 0.75 to 0.88 are obtained with excellent photostability and thermal stability. By dispersing the GQD-MF microspheres in cross-linked polydimethylsiloxane matrix, flexible film with dual functions of high-quality white-light-emitting and light diffusion is obtained and successfully applied for white light-emitting diode fabrication.
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高影响因子
Journal of Materials Chemistry C
·
2015
·Vol. 3
·期 31
·8262-8271
·
IF 4.696
Yan Li,Youshen Wu,Cheng Luo,Bo Wang,Daocheng Wu
Rewritable magnetic fluorescence-encoded microspheres were prepared by coating magnetic microspheres with a fluorescence-encoded melamine-formaldehyde (MF) shell. Fluorescence encoding was realized by varying the dye types and concentrations incorporated into the MF shell. Ten sets of magnetic fluorescence-encoded microspheres including four sets doped with single dye and six sets doped with two dyes were obtained and successfully identified through flow cytometric analysis. High encoding capacity could be achieved by increasing the dye number and intensity levels. More importantly, the original fluorescence-encoded MF shell could be removed via calcination. The inner magnetic microspheres remained unaffected and could be re-coated with a new fluorescence-encoded MF shell easily. The fluorescent MF coating (encoding writing) and calcination (encoding erasing) composed a cycle. Results demonstrated that the magnetic microspheres retained their original characteristics after writing–erasing cycles and the writing–erasing cycle could be repeated numerous times. These kinds of rewritable magnetic fluorescence-encoded microspheres enabled recycling and regeneration. Combining magnetic separation and re-encoding, which can significantly simplify the analysis processes and decrease the analysis cost, these microspheres are expected to be widely used in suspension arrays for high-throughput analyses.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2015
·
IF 4.097
Kangming Xiong,Fangjun Huo,Caixia Yin,Yueying Chu,Yutao Yang,Jianbin Chao,Anmin Zheng
We have developed two new colorimetric and fluorescent probes for hypochlorite based on a novel recognition mechanism: amido oxidized nitroso-group by hypochlorites, which realized the preparation of nitroso compounds. Furthermore, 1 H NMR, ESI-MS and theoretical calculation proved the recognition mechanism. In addition, the probe 2 was applied in practical applications such as detecting the hypochlorite concentration of sodium hypochlorite disinfectant and bioimagings.
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高影响因子
TALANTA
·
2017
·
IF 4.162
Pan Fang,Jian-Zhang Pan,Qun Fang
In this paper, we describe a robust sheath flow-based CE-MS interface with minimal interface dead volume based on an extended pattern. A 20 µm i.d. × 90 µm o.d. fused-silica capillary with a chemically-etched thin-wall tip (30 µm o.d.) was used as the separation capillary as well as electrospray emitter, and a 200 µm i.d. × 375 µm o.d. capillary with a tapered tip (40 µm o.d.) was used as the sheath flow capillary. An extendable sheath-flow interface mode was adopted by decreasing the thickness of separation capillary tip and extending the separation capillary tip out from the sheath flow capillary tip, and allowing the sheath flow to be transferred to the separation capillary tip along its outer surface, forming a surface sheath flow to mix with sample flow at the separation capillary tip. Such a strategy could significantly reduce the interface dead volume and thus improve the CE separation efficiency and detection sensitivity, as well as evidently enhance the working reliability of the CE-MS interface. We investigated various factors affecting the interface performance, including capillary extending distance, emitter diameters, sheath flow capillary shape , and sheath flow rate . Under the optimized conditions, a minimal interface dead volume of ca. 4 pL was obtained which is the smallest one compared with previously-reported sheath flow-based CE-MS interfaces. The feasibility and applicability of the present CE-MS interface were demonstrated in the separation of a peptide mixture with high separation efficiency of 2.07–3.38 µm plate heights and good repeatabilities (< 6.1% RSD, n = 5). We except such a simple and robust interface could provide a possible solution for the development of commercial CE-MS interfaces differing from the currently-used ones, and has the potentials to be applied in routine analytical laboratories for various studies such as proteomics, metabolomics, or single cell analysis.
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高影响因子
Nanoscale
·
2021
·Vol. 13
·期 5
·3275-3284
·
IF 7.79
Huan Zhao,Qifeng Lin,Li Huang,Yunfeng Zhai,Yuan Liu,Yan Deng,Enben Su,Nongyue He
A novel enhanced chemiluminescent immunoassay (CLIA) for ultrasensitive and excellent precisive determination of cardiac troponin I (cTnI) was reported. The method made full use of poly[(N-isopropyl acrylamide)-co-(methacrylic acid)] (P(NIPAM-co-MAA)) microspheres as new potential signal enhancers and magnetic fluorescent nanoparticles as internal standards for better precision. This protocol involved a sandwich format, in which the antigen in the sample was captured by the immobilized antibodies on the surface of magnetic fluorescent beads and recognized by the other antibodies labeled with acridinium ester (AE)-loaded P(NIPAM-co-MAA) microspheres. The combination of the remarkable sensitivity of the enhanced CLIA method and the use of P(NIPAM-co-MAA) microspheres as anti-cTnI carriers for acridinium ester signal amplification provided an extremely sensitive limit of blank (LoB) at 0.097 pg mL−1, a limit of detection (LoD) at 0.116 pg mL−1, and a limit of quantitation (LoQ) at 0.606 pg mL−1, much greater than those achieved by the classical chemiluminescence immunoassay (CLIA, Getein). Moreover, the intra-day variable coefficient can be improved to 1.21–2.12%, and inter-day variability was 2.01–3.49% under the application of magnetic fluorescent beads as an internal standard. The sensitivity and precision have reached a high level, comparable with the current commercial detection kits. The results showed a good correlation with a commercial chemiluminescence assay (CLIA, Abbott), with a correlation coefficient of 0.9883. This proposed method has been successfully applied to the clinical determination of cTnI in the human serum.
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高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Hao Qin,Pengpeng Lu,Jingyang Xu,Kai Jiang,Danying Zhao,Zhenhua Jiang,Jie Zhao,Yunhe Zhang
Superhydrophobic surfaces generally encounter substantial challenges due to their weak stability when subjected to harsh environments. Specifically, the delicate micro-nano structures present on these surfaces are susceptible to external destruction. Given the robust mechanical characteristics and chemical stability of polyether ether ketone (PEEK), ultra-stable superhydrophobic PEEK surfaces were developed using template replication and chemical modification methods, achieving a water contact angle (WCA) of 159.6 ± 1.4° and a water rolling angle (WRA) of 3.7 ± 0.6°. The stable superhydrophobicity is primarily attributed to the synergistic effect of the robust arrayed micro-nano structures and the stably bonded fluorine long chains. Notably, the superhydrophobic PEEK surfaces demonstrate remarkable durability. They could maintain satisfactory superhydrophobicity even after 120 sandpaper abrasion cycles, 600 sharp steel blade scraping cycles, 10 L of water impact, 24 h of ultrasonic destruction, 52 weeks of ageing, 7 days of corrosive reagent damage, 7 days of UV irradiation, etc. Moreover, these fabricated superhydrophobic PEEK surfaces also exhibit robust antifouling and self-cleaning properties. This ultra-stable superhydrophobic PEEK surface is of significant importance for efficient antifouling of biomedical and aerospace in harsh environments.
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