期刊：
Journal of Alloys and Compounds,2020年834:155088- ISSN：0925-8388
通讯作者：
Peng, Hui
作者机构：
[Jiang, Chunli; Lin, Hechun; Zhang, Ting; Huang, Sihui; Qi, Ruijuan; Luo, Chunhua; Peng, Hui] East China Normal Univ, Sch Phys & Elect Sci, Dept Elect, Key Lab Polar Mat & Devices MOE, Shanghai 200241, Peoples R China.;[Liu, Mengqin] Hengyang Normal Univ, Key Lab Funct Met Organ Cpds Hunan Prov, Hengyang 421008, Peoples R China.;[Travas-Sejdic, Jadranka] Univ Auckland, Polymer Elect Res Ctr PERC, Sch Chem Sci, Auckland, New Zealand.;[Travas-Sejdic, Jadranka] MacDiarmid Inst Adv Mat & Nanotechnol, Wellington, New Zealand.;[Peng, Hui] Shanxi Univ, Collaborat Innovat Ctr Extreme Opt, Taiyuan 030006, Shanxi, Peoples R China.
通讯机构：
[Peng, Hui] E;East China Normal Univ, Sch Phys & Elect Sci, Dept Elect, Key Lab Polar Mat & Devices MOE, Shanghai 200241, Peoples R China.
关键词：
Lead halide perovskites;Nanocrystals;Photoluminescence recovery;Polymer composite;Water induced
摘要：
Lead halide perovskites (LHPs) are very promising for new optoelectronic devices due to their excellent optical and electronic properties. However, the poor stability against water, heat and UV light greatly restricts their practical applications. In this work, a CH3NH3PbBr3/silicon oil/PDMS-urea composite is prepared by encapsulating CH3NH3PbBr3 nanocrystals and silicon oil into the PDMS-urea polymer matrix. This composite shows characteristics of water-enhanced photoluminescence (PL) and water-driven PL recovery. After immersed in water, the photoluminescence quantum yield of the composite increases from initial 26.0%-52.2%, which is ascribed to the passivation of surface defects by the capping of polymer chains, H3O+ and OH-. The composite possesses superior stability against UV light illumination in water. Furthermore, the composite film exhibits a capability of water-driven PL recovery after UV light irradiation. By applying alternate water/UV treatments, the PL can be reversibly switched "on and off". The "on/off" ratio value of the PL intensity reached more than 4. These advantages make this composite highly promising in applications utilising luminescent switching and for under water lighting. (c) 2020 Elsevier B.V. All rights reserved.
作者机构：
[Zhang, Fu-Xing; Sheng, Liang-Bing; Chen, Man-Sheng; Liu, Meng-Qin] Hengyang Normal Univ, Key Lab Funct Met Organ Cpds Hunan Prov, Hunan Prov Univ Key Lab Funct Organometall Mat, Coll Chem & Mat Sci, Hengyang 421008, Hunan, Peoples R China.
通讯机构：
[Sheng, LB; Chen, MS] H;Hengyang Normal Univ, Key Lab Funct Met Organ Cpds Hunan Prov, Hunan Prov Univ Key Lab Funct Organometall Mat, Coll Chem & Mat Sci, Hengyang 421008, Hunan, Peoples R China.
关键词：
Electrospray-ionization mass spectrometry;Heteronuclear;Homonuclear;One-dimensional chain;Structure
摘要：
The organic ligand (E)-8-hydroxyquinoline-2-carbaldehyde oxime (H2L) was used to react with Ni(CH3COO)(2)center dot 4H(2)O and NaN(CN)(2) at 100 degrees C to obtain the complex [Ni3Na(HL)(3)(L)(2)](n)center dot 4nCH(3)CN (1). Interestingly, the five ligands in the structure chelate three Ni ions, and the uncoordinated O on the ligand captures one Na+. However, the above scheme remains the same, and after adding isonicotinic acid (ina), it obtained the complex [Ni-4(HL)(4)(L)(2)](2)center dot 2CH(3)CN (2), which eight Ni2+ ions are coordinated by twelve ligands. The component distribution of the complexes in different solutions was measured by electrospray-ionization mass spectrometry (ESI-MS). It was found that the complexes exhibited different component distribution in different solutions. Not only the existence of low-nuclear molecular ion peaks could be monitored, but even higher-nuclear components could also be detected, and the alkali metal ions could be effectively identified. It was indicating that the compounds would assemble differently in different solutions. Surprisingly, homonuclear clusters 2 was providing a basis for further directing the directed synthesis of higher nuclear clusters. (C) 2019 Published by Elsevier Ltd.
摘要：
Eight disubstituted benzyltin complexes, i.e., {[R(O)C=N-N=C (Me)COO]R'Sn-2(CH3OH)}(n) (1a and 2b), {[R(O)C=N-N=C (Me)COO]R'Sn-2(CH3OH)}(2) (1b and 1d) and {[R(O)C=N-N=C (Me)COO]R'Sn-2}(n) (1c, 2a, 2c, and 2d) (R = C4H3O-, C4H3S-, p-t-Bu-C6H4- or p-MeO-C6H4-; R' = o-Cl-C6H4CH2- or o-Me-C6H4CH2-), were prepared from the reaction of arylformylhydrazine, pyruvic acid and disubstituted benzyltin dichloride with microwave irradiation. All complexes were characterized by FT-IR spectroscopy, H-1, C-13 and Sn-119 NMR spectroscopy, HRMS, elemental analysis, X-ray single-crystal diffraction and TGA. The in vitro antitumour activities of all complexes were evaluated by an MTT assay against three human cancer cell lines (NCI-H460, HepG2, and MCF7). 2b exhibited strong antitumour activity on HepG2 cells and was expected to be a suitable platform for further chemical optimization to develop as anticancer therapeutics. The DNA binding of 2b was studied by UV-visible absorption spectrometry, fluorescence competitive assays, viscosity measurements and gel electrophoresis. Molecular docking was used to predict the binding between 2b and DNA, and the results show that 2b can become embedded in the double helix of DNA and cleave DNA.
摘要：
In this work, Pd-decorated N-doped reduced graphene oxide (Pd/N-RGO) was successfully synthesized by a simple wet-chemical method without using any capping agent and stabilizer. The synthesized Pd/N-RGO composite has been carefully characterized by various techniques. The X-ray photoelectron spectra provide the evidence of successful incorporation of N into the N-RGO sheets, while the presence of Pd nanoparticles with the sizes of 5-20 nm on the N-RGO sheets was confirmed by the transmission electron microscopy. By integrating the advantages of the large surface area of N-RGO sheets and good electron transfer efficiency of Pd nanoparticles, the Pd/N-RGO-based sensor shows an improved electrocatalytic activity toward the estradiol oxidation. Therefore, the Pd/N-RGO composite can be used as an effective sensing platform for the non-enzymatic detection of estradiol. It also demonstrates that the fabricated sensor has two linear concentration ranges (0.1-2 and 2-400 mu M) and a low detection limit (1.8 nM) for the estradiol detection. Finally, the resulting sensor was successfully used to detect estradiol in some real samples and the satisfactory recoveries of 96.0-103.9% were obtained. The prepared Pd/N-RGO composite with more distinct merits including simple manufacture, preferable reproducibility and long-term stability can be a promising candidate for the advanced electrode material in sensing applications. (C) 2018 Elsevier B.V. All rights reserved.
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="http://www.elsevier.com/xml/common/dtd" xmlns="http://www.elsevier.com/xml/ja/dtd" 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="http://www.elsevier.com/xml/common/dtd" xmlns="http://www.elsevier.com/xml/ja/dtd" 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="http://www.elsevier.com/xml/common/dtd" xmlns="http://www.elsevier.com/xml/ja/dtd" 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>]]>
作者机构：
[Liu, Mengqin; Xu, Zhifeng; Li, Junhua] Hengyang Normal Univ, Coll Chem & Mat Sci, Hengyang 421008, Peoples R China.;[Liu, Youcai; Feng, Haibo; Li, Junhua; Liu, YC; Qian, Dong; Jiang, Jianbo] Cent S Univ, Coll Chem & Chem Engn, Changsha 410083, Hunan, Peoples R China.;[Li, Junhua] Hengyang Normal Univ, Key Lab Funct Organometall Mat, Hengyang 421008, Peoples R China.
通讯机构：
[Liu, YC; Qian, D] C;Cent S Univ, Coll Chem & Chem Engn, Changsha 410083, Hunan, Peoples R China.
关键词：
Cyclic voltammetry;Differential pulse voltammetry;Electrochemical detection;Glassy carbon electrode;Nanocubes;Wet chemical method
摘要：
The authors report on a low temperature method for large-scale fabrication of cuprous oxide nanocubes deposited on nitrogen-doped reduced graphene oxide (Cu2O/N-RGO). The material was deposited in a glassy carbon electrode (GCE) where it is found to display enhanced electrocatalytic activity for oxidation of diethylstilbestrol (DES). The morphology and composition of Cu2O/N-RGO were characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy and energy-dispersive spectroscopy. The results demonstrate that the RGO is doped with 3.5% of nitrogen (atomic ratio), and that nanostructured Cu2O particles with controlled cubical morphology and an average size of about 450 nm have been homogeneously deposited on the surface of N-RGO sheets. The oxidation peak of DES was recorded at 0.315 V (vs. saturated calomel electrode) using differential pulse voltammetry. Under the optimal conditions, the modified GCE displays a linear response in the 0.3 to 150 μM DES concentration range, and the limit of detection is 10 nM. The method was applied to the determination of DES in spiked milk, meat and urine samples and gave excellent selectivity, stability and reproducibility. A nanocomposite consisting of Cu2O nanocubes/N-doped reduced graphene oxide (Cu2O/N-RGO) for the electrochemical determination of diethylstilbestrol (DES). The Cu2O/N-RGO modified electrode displays a linear response in the 0.3 to 150 μM DES concentration range. The method was applied to the determination of DES in spiked milk, meat and urine samples
