通讯机构：
[Xu, Zhifeng] H;Hengyang Normal Univ, Coll Chem & Mat Sci, Hengyang 421008, Peoples R China.
关键词：
Copper (II) ion;Ion imprinted polymer;1,8-naphthalimide;Ion recognition;Fluorescence emission
摘要：
In the present study, a fluorescent ion-imprinted sensor (FIIS) for rapid and convenient detection of Cu2+ ions was fabricated. A fluorescent polymerizable ligand, i.e., 4-(2-aminomethyl)pyridine-N-allylnaphthalimide, was designed and synthesized. The FIIS was prepared by surface functionalization of PVDF membrane with a thin layer of copper (II) ion-imprinted polymer using the synthesized ligand as the fluorescent functional monomer. The intensity of fluorescence emission of FIIS decreased linearly with the increase of copper (II) ions concentration in the range of 0-70.0 mu M. The results of selectivity tests indicated that FIIS has high specific recognition ability for Cu2+ ions. The recoveries for the spiked samples were in the range of 96.4-104.4%, and the relative standard deviations (RSDs) were found to be 2.17-4.75%. The FIIS was successfully applied to the determination of copper (II) ions in real water samples. The Limits of detection (LODs) for Cu2+ ions in real water samples were in the range of 0.11-0.14 uM. The present study provided a feasible strategy for construction of fluorescent ion-imprinted sensor for convenient, sensitive and selective detection of metal ions. (C) 2017 Elsevier B.V. All rights reserved.
摘要：
A reaction-based near-infrared (NIR) fluorescent probe, (E)-4-(2-(4-(dicyanometh- ylene)-4H-chromen-2-yl) vinyl)phenyl picolinate (DCM-P), was designed and synthesized by employing the dicyanomethylene-4H-pyran chromophore as the fluorophore and the 2-picolinic ester group as the recognition unit. The proposed probe DCM-P showed significant NIR fluorescence "turn-on" response to Cu2+ with distinct colorimetric change from yellow to purple. The recognition mechanism of probe for Cu2+ was confirmed by fluorescence spectroscopy, H-1 NMR spectra, HAMS spectrometry and TD-DFT calculations. The probe possesses the advantages of large Stokes shift (116 nm), applicability in physiological conditions, low detection limit (2.3 x 10(-8) M), and high selectivity toward Cu2+ in presence of other metal ions. Encouraged by these desirable properties, the probe DCM-P was successfully used for quantitative determination of Cu2+ in real water samples and NIR fluorescence imaging of Cu2+ in living cells with satisfactory results.
摘要：
Porcine epidemic diarrhea(PED)is an acute intestinal infectious disease caused by porcine epidemic diarrhea virus(PEDV).PED occurs highly in ten days piglets,with a mortality rate of 100%.Colloidal gold immunochromatography assay and enzymelinked immunosorbent assay(ELISA)are the most widely used for the detection of PEDV.Both methods require natural antibodies whose activity are greatly affected by environmental factors seriously.So we prepare the artificial antibody of PEDV,a kind of nanomolecular imprinted polymers synthesized by solid reaction method with the epitope of PEDV as the template molecule.The antigen PEDV detected by artificial antibody through pseudo enzyme linked immunosorbent assay will be discussed.
摘要：
A nanohybrid composed of Ag@Cu2O heterogeneous nanocrystals supported on N-doped reduced graphene oxide (Ag@Cu2O/N-RGO) has been synthesized by a simple wet-chemical method. The resultant composite consists of N-RGO sheets fully and homogeneously coated with a dense layer of Ag@Cu2O nanocrystals. Both Ag and N-RGO are in direct contact with Cu2O, and Ag nanoparticles with sizes of 2-5 nm are mainly deposited on the surface of Cu2O cubes (edge length of 500 nm). The electrochemical studies reveal that the ternary Ag@Cu2O/N-RGO composite exhibit significantly enhanced electrocatalytic activity for H2O2 sensing compared with either the single component (N-RGO) or two component systems (Cu2O/N-RGO and Ag/N-RGO), which is mainly due to the synergetic catalysis of the ternary system. The nonenzymatic sensor based on Ag@Cu2O/N-RGO composite shows overwhelmingly superior comprehensive performance for the H2O2 detection over the documented Ag-based sensors. More specifically, it displays a rapid response (10 s) to H2O2 over a wide linear range of 54-700 nM with a high sensitivity of 1298.3 mu A mM(-1) cm(-2) and a low detection limit of 10 nM. Moreover, the sensor also exhibits the preferable selectivity in the presence of biologically coactive compounds accompanied with long-term stability and good reproducibility. (C) 2018 Elsevier B.V. All rights reserved.
摘要：
<![CDATA[<ce:abstract xmlns:ce="" xmlns="" xml:lang="en" id="abs0010" view="all" class="author"><ce:section-title id="sectitle0010">Abstract</ce:section-title><ce:abstract-sec id="abssec0010" view="all"><ce:simple-para id="abspara0010" view="all">In this work, the N doping together with Pd?Cu@Cu<ce:inf loc="post">2</ce:inf>O hybridization for graphene oxide was achieved by a combined process of hydrothermal treatment and chemical reduction, based on which a novel Pd?Cu@Cu<ce:inf loc="post">2</ce:inf>O cubes decorated N-doped reduced graphene oxide (Pd?Cu@Cu<ce:inf loc="post">2</ce:inf>O/N-RGO) hybrid was obtained. The synthesized Pd?Cu@Cu<ce:inf loc="post">2</ce:inf>O/N-RGO was detailedly characterized by various technologies. The results show that the low Pd loading Cu@Cu<ce:inf loc="post">2</ce:inf>O cubes with the sizes of 300–500?nm are well dispersed on N-RGO sheets, thereby avoiding the serious aggregation and maintaining a large electroactive surface area of the attained hybrid. Benefiting from the synergistic effect of the properties of Pd?Cu@Cu<ce:inf loc="post">2</ce:inf>O particles and N-RGO sheets, the Pd?Cu@Cu<ce:inf loc="post">2</ce:inf>O/N-RGO modified electrode exhibits remarkable electrocatalytic performance on the oxidation of tryptophan with the enhanced oxidation response and the lowered oxidation overpotential. Under the optimal conditions for the electrochemical detection of tryptophan, the constructed sensor displays a wide linear range (0.01–40.0?μM) and a low detection limit (1.9?nM), outperforming most of the reported hybrid-based sensors. The proposed sensor also features good selectivity, stability and reproducibility, which has been successfully applied for the detection of tryptophan in the urine and milk samples with satisfactory recoveries. All these results suggest that the Pd?Cu@Cu<ce:inf loc="post">2</ce:inf>O/N-RGO hybrid could be a promising and convenient material for the fabrication of high-performance electrochemical sensors.</ce:simple-para></ce:abstract-sec></ce:abstract><ce:abstract xmlns:ce="" xmlns="" class="graphical" id="abs0015" view="all"><ce:section-title id="sectitle0015">Graphical abstract</ce:section-title><ce:abstract-sec id="abssec0015" view="all"><ce:simple-para>Display Omitted</ce:simple-para></ce:abstract-sec></ce:abstract><ce:abstract xmlns:ce="" xmlns="" class="author-highlights" xml:lang="en" id="abs0020" view="all"><ce:section-title id="sectitle0020">Highlights</ce:section-title><ce:abstract-sec id="abssec0020" view="all"><ce:simple-para id="abspara0020" view="all"><ce:list id="ulist0010"><ce:list-item id="u0010"><ce:label>?</ce:label><ce:para id="p0010" view="all">The Pd?Cu@Cu<ce:inf loc="post">2</ce:inf>O/N-RGO hybrid was synthesized via a facile wet chemical route.</ce:para></ce:list-item><ce:list-item id="u0015"><ce:label>?</ce:label><ce:para id="p0015" view="all">An enhanced electrocatalytic property of the hybrid has been demonstrated.</ce:para></ce:list-item><ce:list-item id="u0020"><ce:label>?</ce:label><ce:para id="p0020" view="all">The constructed sensor displays super performances for the tryptophan detection.</ce:para></ce:list-item><ce:list-item id="u0025"><ce:label>?</ce:label><ce:para id="p0025" view="all">Advantages include excellent practicability with remarkable reliability.</ce:para></ce:list-item></ce:list></ce:simple-para></ce:abstract-sec></ce:abstract>]]>
摘要：
<jats:p>Diruthenium ethynyl complexes <jats:bold>1</jats:bold>–<jats:bold>3</jats:bold> (<jats:bold>1</jats:bold>: 1,5‐dithia‐s‐indacene‐4,8‐dione; <jats:bold>2</jats:bold>: 4,8‐diethoxybenzo[1,2‐b:4,5‐ b']dithiophene; <jats:bold>3</jats:bold>: 4,8‐didodecyloxybenzo[1,2‐b:4,5‐b']dithiophene) have been synthesized by incorporating the respective conjugated heterocyclic spacer and characterized by <jats:styled-content style="fixed-case">NMR</jats:styled-content> and elemental analysis. The effects of bridge ligands’ properties on electronic coupling between redox‐active ruthenium terminal groups were investigated by electrochemistry, <jats:styled-content style="fixed-case">UV</jats:styled-content>/vis/near‐<jats:styled-content style="fixed-case">IR</jats:styled-content> and <jats:styled-content style="fixed-case">IR</jats:styled-content> spectroelectrochemistry combined with density functional theory (<jats:styled-content style="fixed-case">DFT</jats:styled-content>) and time‐dependent <jats:styled-content style="fixed-case">DFT</jats:styled-content> calculations. Electrochemistry results indicated that complexes <jats:bold>1</jats:bold>–<jats:bold>3</jats:bold> exhibit two fully reversible oxidation waves, and complexes <jats:bold>2</jats:bold> and <jats:bold>3</jats:bold> with electron‐rich and π‐conjuagted bridge ligands are characterized by excellent electrochemical properties. Furthermore, the larger ν(C ≡ C) separation from the <jats:styled-content style="fixed-case">IR</jats:styled-content> spectroelectrochemical results of <jats:bold>2</jats:bold> and <jats:bold>3</jats:bold> and the intense <jats:styled-content style="fixed-case">NIR</jats:styled-content> absorption features of singly oxidized species <jats:bold>2</jats:bold><jats:sup>+</jats:sup> and <jats:bold>3</jats:bold><jats:sup>+</jats:sup> revealed that their molecular skeletons have superior abilities to delocalize the positive charge. The spin density distribution from <jats:styled-content style="fixed-case">DFT</jats:styled-content> calculations proved the conclusions of this study.</jats:p>
作者机构：
[Zhang, Deng-Yu; Xu, Zhi-Feng; Tang, Zhen-Kun] Hengyang Normal Univ, Coll Phys & Elect Engn, Hengyang 421008, Peoples R China.;[Zhang, Deng-Yu; Xu, Zhi-Feng; Tang, Zhen-Kun] Hengyang Normal Univ, Coll Chem & Mat Sci, Hengyang 421008, Peoples R China.;[Hu, Shu-Xian; Lau, Woon-Ming; Tang, Zhen-Kun; Liu, Li-Min] Beijing Computat Sci Res Ctr, Beijing 100084, Peoples R China.;[Lau, Woon-Ming] Univ Sci & Technol Beijing, Sch Math & Phys, Ctr Green Innovat, Beijing 100083, Peoples R China.
通讯机构：
[Liu, Li-Min] B;Beijing Computat Sci Res Ctr, Beijing 100084, Peoples R China.
摘要：
<jats:title>Abstract</jats:title><jats:p>The suitable band structure is vital for perovskite solar cells, which greatly affect the high photoelectric conversion efficiency. Cation substitution is an effective approach to tune the electric structure, carrier concentration, and optical absorption of hybrid lead iodine perovskites. In this work, the electronic structures and optical properties of cation (Bi, Sn, and TI) doped tetragonal formamidinium lead iodine CH(NH<jats:sub>2</jats:sub>)<jats:sub>2</jats:sub>PbI<jats:sub>3</jats:sub> (FAPbI<jats:sub>3</jats:sub>) are studied by first-principles calculations. For comparison, the cation-doped tetragonal methylammonium lead iodine CH<jats:sub>3</jats:sub>NH<jats:sub>3</jats:sub>PbI<jats:sub>3</jats:sub> (MAPbI<jats:sub>3</jats:sub>) are also considered. The calculated formation energies reveal that the Sn atom is easier to dope in the tetragonal MAPbI<jats:sub>3</jats:sub>/FAPbI<jats:sub>3</jats:sub> structure due to the small formation energy of about 0.3 eV. Besides, the band gap of Sn-doped MAPbI<jats:sub>3</jats:sub>/FAPbI<jats:sub>3</jats:sub> is 1.30/1.40 eV, which is considerably smaller than the un-doped tetragonal MAPbI<jats:sub>3</jats:sub>/FAPbI<jats:sub>3</jats:sub>. More importantly, compare with the un-doped tetragonal MAPbI<jats:sub>3</jats:sub>/FAPbI<jats:sub>3</jats:sub>, the Sn-doped MAPbI<jats:sub>3</jats:sub> and FAPbI<jats:sub>3</jats:sub> have the larger optical absorption coefficient and theoretical maximum efficiency, especially for Sn-doped FAPbI<jats:sub>3</jats:sub>. The lower formation energy, suitable band gap and outstanding optical absorption of the Sn-doped FAPbI<jats:sub>3</jats:sub> make it promising candidates for high-efficient perovskite cells.</jats:p>
