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oe1(光电查) - 科学论文

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出版时间
  • 2018
研究主题
  • electropolymerization
  • polyporphyrin films
  • quartz crystal microbalance method
  • oxygen electroreduction.
应用领域
  • Applied Chemistry
机构单位
  • G.A. Krestov Institute of Solution Chemistry of RAS
  • University Union Nicola Tesla
  • Ivanovo State University of Chemistry and Technology
84 条数据
?? 中文（中国） ▾

  • Metala??organic framework nanosheets for enhanced performance of organic photovoltaic cells

    摘要： Metal-organic nanosheets (MONs) are an emerging class of two-dimensional materials whose diverse and readily tunable structures make them ideal for use in optoelectronic applications. Here, liquid exfoliation is used to synthesize ultrathin zinc-porphyrin based MONs with electronic and optical properties ideally suited for incorporation into a polythiophene-fullerene (P3HT-PCBM) organic solar cell. Remarkably, the addition of MONs to the photoactive layer of a photovoltaic device results in a power conversion efficiency of 5.2%, almost twice that for reference devices without nanosheets with a simultaneous improvement of Jsc, Voc and FF. Our analysis indicates that the complimentary electronic, optical and structural properties of the MONs allows them to act as a surface to template the crystallization of P3HT leading to a doubling of the absorbance, a tenfold increase in hole mobility and reduced grain size. These results demonstrate the potential of MONs as a tunable class of two-dimensional materials for enhancing the performance of a broad range of organic solar cells and other electronic devices.

    关键词： Metal-organic nanosheets,organic photovoltaic cells,power conversion efficiency,liquid exfoliation,zinc-porphyrin

    更新于2025-09-19 17:13:59

  • Electrochemical behaviour and analytical applications of a manganese porphyrin a?? silica hybrid film prepared by pulsed laser deposition

    摘要： Hybrid nanomaterials can have superior properties in comparison with individual components, sometimes greatly improving their optoelectronic activity. For this reason, modified carbon electrodes were obtained using a hybrid material composed of 5,10,15,20-tetra(4-tolyl)porphyrinato manganese (III) chloride (MnTTP) embedded in a silica matrix. The laser ablation deposition technique (PLD) has been used to immobilize the manganese porphyrin–silica hybrid on the surface of the carbon electrodes. The successful transfer of the manganese-porphyrin was evidenced by UV–Vis absorption spectroscopy. The PLD-deposited hybrid film was characterized using AFM and electrochemical methods (cyclic voltammetry and square wave voltammetry). The viability of this hybrid nanomaterial film as a redox mediator for the anodic oxidation and sensitive voltammetric determination of ascorbic acid in buffer solution (pH = 6.5) is described. The recorded anodic process is attributed to its oxidation to dehydroascorbic acid, with satisfactory catalytic current response and low non-Faradaic current.

    关键词： Mn-porphyrin,Silica matrix,Hybrid nanomaterial,Pulse laser deposition,Electrocatalytic film,Ascorbic acid

    更新于2025-09-19 17:13:59

  • Light soaking effect driven in porphyrin dye-sensitized solar cells using 1D TiO2 nanotube photoanodes

    摘要： Light soaking (LS) effect on porphyrin (GD2) dye-sensitized solar cells (DSSCs) using well-ordered TiO2 nanotube (TNT) photoanodes was studied with different lengths of TNTs and LS treatment time. The TNT array possessing longer length and larger tube diameter had improved photoelectrochemical (PEC) property by generating larger photocurrent, and besides provided a larger surface area to yield more dye loading. The LS effect on GD2-applied DSSCs using TNT photoanodes was triggered off in the first 5 min of the LS treatment, and gradually increased during 60 min LS treatment. The improved PEC property and dye loading by longer TNT array (22 μm) led to the noticeable enhancement rate of power conversion efficiency from 0.7% to 1.88% (168 % increase) after 60 min LS treatment, which was more prominent compared to the enhancement of GD2-applied DSSCs using mesoporous TiO2 films. Especially, morphological property of well-ordered 1D TNT photoanodes offers more spaces to facilitate the cation exchange in electrolyte system, leading to enhancing electron injection and reducing recombination under the LS condition. Electrochemical impedance spectroscopy (EIS) results confirmed the contribution of well-aligned 1D TNT structure to significant LS effect in GD2-applied DSSCs.

    关键词： anodization,TiO2 nanotube,Photoelectrode,Porphyrin,Light soaking,Dye-sensitized solar cells

    更新于2025-09-19 17:13:59

  • CsPbBr <sub/>3</sub> Quantum Dots as Artificial Antennas to Enhance the Light-Harvesting Efficiency and Photoresponse of Zinc Porphyrin

    摘要： Broadening the spectral range and enhancing the efficiency of light-harvesting materials are important to the design of novel optoelectronic devices. In this work, CsPbBr3 quantum dots (QDs) are introduced as artificial antennas to enhance both the light-harvesting efficiency and photoresponse of zinc porphyrin (ZnP). The Fluorescence Resonance Energy Transfer (FRET) process both in solution and films from the donor CsPbBr3 QD to the acceptor ZnP have been systematically investigated, and an energy transfer efficiency over 70% in solution and a high optical sensitivity have been realized with the optimal of QD/ZnP ratio on films. A photocurrent density of up to 1.00×10-4 A·cm-2 can be achieved for the QD/ZnP film, and the corresponding on/off photocurrent value can be increased by two orders of magnitude compared with that of ZnP. Furthermore, the as-prepared light-harvesting film also demonstrates a high optical sensitivity at the optimal QD/ZnP ratio. Our research provides an effective way for designing and improving the QD/ZnP “antenna” for solar-energy harvesting devices.

    关键词： Zinc Porphyrin,CsPbBr3 Quantum Dots,FRET,Photoresponse,Light-Harvesting Efficiency

    更新于2025-09-19 17:13:59

  • Nonradiative Energy Transfer in a??Colloidal Quantum Dot Nanoclustera??Dyea?? Hybrid Nanostructures: Computer Experiment

    摘要： A computer model of nonradiative electronic excitation energy transfer from nanoclusters of colloidal quantum dots of cadmium selenide to the meso-tetra(3-pyridyl)porphyrin molecule in hybrid nanostructures nanocluster–dye has been constructed and analyzed. The model uses the experimental luminescence and absorption spectra of quantum dots and the dye, takes into account heterogeneity of the properties of quantum dots in nanoclusters and the different location of the dye in the hybrid structure. It has been shown that, in the ideal case, due to such energy transfer, the intensity of the luminescent signal of the dye can be increased by five orders of magnitude. However, this value is significantly reduced due to nonluminescent particles, the presence of a protective ligand shell, a large size distribution of the particles, and the non-optimal geometric structure of the hybrid system.

    关键词： porphyrin dye,colloidal quantum dots,F?rster resonance energy transfer,hybrid systems,cadmium selenide,computer simulation

    更新于2025-09-19 17:13:59

  • Synthesis and properties of a novel porphyrin–fullerene triad assembled through donor–acceptor bonding

    摘要： Complexation of (hydroxy)(oxo)(5,10,15,20-tetraphenylporphyrinato) molybdenum(v) with 2',5'-di(2-pyridyl)-1'-(3-pyridyl methyl)pyrrolidino[70]fullerene leading to a new donor–acceptor triad is characterized by quantitative description of the equilibrium and the reaction rate. The prospects of the triad as a photosynthetic antenna imitator and an active layer in solar energy conversion devices are substantiated.

    关键词： solar energy conversion,porphyrin–fullerene triad,donor–acceptor bonding,photosynthesis

    更新于2025-09-16 10:30:52

  • Solar cells sensitized by porphyrin dyes containing a substituted carbazole donor with synergistically extended absorption and suppressed the dye aggregation

    摘要： To achieve high power conversion efficiencies (PCEs), three porphyrin sensitizers have been synthesized and explored to simultaneously enhance the photocurrent (Jsc) and photovoltage (Voc). On basis of the XW4, a benzothiadiazole (BTD) unit has been introduced to afford XW57 with the aim to extend the absorption wavelength and enhance the light harvesting ability. As a result, a Jsc of 13.72 mA/cm2 has been obtained for XW57, higher than that of XW4. On this basis, XW58 has been prepared by modifying the carbazole-based donor with two bulky dihexyloxyphenyl groups, and the superior anti-aggregation character raises the Voc from 781 mV (XW4) to 844 mV. When both the BTD unit and the bulky groups are introduced to the acceptor and donor units, respectively, the resulting sensitizer XW59 exhibits a highest PCE value of 7.34% with synergistically enhanced Jsc of 13.19 mA/cm2 and Voc of 793 mV. These results provide further insight into developing high performance dye-sensitized solar cells.

    关键词： Sensitizers,Bulky groups,Porphyrin,Carbazole,Dye-sensitized solar cells

    更新于2025-09-16 10:30:52

  • A novel “on-off” colorimetric sensor for glutathione based on peroxidase activity of montmorillonite loaded TiO2 functionalized by porphyrin precisely controlled by visible light

    摘要： Well-dispersed nanocomposites based on Ca-montmorillonite decorated by porphyrin functionalized titanium dioxide (H2TCPP-TiO2-MMT) was synthesized by a facile strategy. H2TCPP-TiO2-MMT was demonstrated to possess the intrinsic peroxidase-like activity and could catalyze 3’,3’,5’,5’-tetramethylbenzidine (TMB) oxidized by H2O2 accompanied with the color changed from colorless to blue in a short time under visible light irradiating. The optimum experimental conditions, robustness, as well as Michaelis-Menten kinetics was investigated. The fluorescent probe assay indicated the good performance of H2TCPP-TiO2-MMT was attributed to the ·OH radicals from H2O2 decomposition, which was induced by the electron-hole pairs of H2TCPP-TiO2-MMT generated under visible light irradiating. Based on its peroxidase activity, a convenient colorimetric sensor for detecting glutathione (GSH) was proposed. The detection limit for GSH was 0.057 μM, with the linear detection range of 0.1-20 μM. Notably, besides the enhanced peroxidase-like activity, another merit for this sensor was that the reaction time can be controlled accurately by adjusting irradiation time compared with traditional colorimetric sensors, which would benefit the accuracy in detecting GSH. In addition, results of anti-interference and detecting GSH in human serum assays indicated that the H2TCPP-TiO2-MMT was predicted to be one of the promising materials for fast visual colorimetry.

    关键词： Peroxidase,Montmorillonite,Porphyrin,Colorimetric assay

    更新于2025-09-16 10:30:52

  • Application of maleimide modified graphene quantum dots and porphyrin fluorescence resonance energy transfer in the design of a??a??turn-ona??a?? fluorescence sensors for biothiols

    摘要： Two novel fluorescent probes were designed to detect the biothiol in foods using the highly efficient Michael addition reaction between maleimide-derived probes and the biothiol. First, maleimide functionalized GQDs (M-GQDs) were synthesized and used for biothiol identification according to the Michael addition principle. The biothiol can be detected in the range of 5× 10-9 to 4× 10-7 mol/L and the detection limit was 1.69×10-9 mol/L. Then, a fluorescence resonance energy transfer (FRET) system between M-GQDs and tetrakis (4-aminophenyl) porphyrin (TAPP) for biothiol detection was developed. However, the process of FRET was switched off in the presence of biothiols due to the switch of M-GQDs fluorescence emission to the“ON” mode following the Michael addition mechanism. The system could quickly and accurately detect the biothiol with a detection range of 6.7×10-10 to 2×10-7 mol/L and a detection limit of 2.34×10-10 mol/L. Compared to the single detection system, the FRET system had a wider detection range and lower detection limit, and the related biomolecules did not interfere with the quantitative identification of the biothiol. The proposed method was successfully applied for the determination of the biothiol in foods and human blood samples.

    关键词： Porphyrin,Fluorescence “turn-on”,Biothiols,FRET,Graphene quantum dots

    更新于2025-09-16 10:30:52

  • “Turn off-on” fluorescent sensor based on quantum dots and self-assembled porphyrin for rapid detection of ochratoxin A

    摘要： We report herein a “turn off-on” fluorescent sensor based on ZnCdSe quantum dots (ZnCdSe QDs) and self-assembled zinc porphyrin for sensitive and rapid detection of ochratoxin A (OTA). Using environmentally friendly dodecyl dimethyl betaine as “soft template”, zinc 5, 10, 15, 20-tetra(4-pyridyl)-21H-23H-porphine (ZnTPyP) was self-assembled into nanorods (SA-ZnTPyP) through a green process. The OTA detection process involves two steps: (1) the fluorescence of ZnCdSe QDs is significantly quenched by SA-ZnTPyP, and (2) the combination between SA-ZnTPyP and OTA releases ZnCdSe QDs from their quenchers such that the fluorescence is recovered. Under the optimized experimental conditions, the newly developed fluorescent sensor showed a linear response in concentration range 0.5–80 ng mL?1, with a detection limit of 0.33 ng mL?1. The excellent applicability of the system has been verified in milk and coffee samples, with relative recoveries between 98.33% and 103.70%. The proposed fluorescent sensor exhibits excellent selectivity and high sensitivity, and thus could be a promising tool for on-site determination of OTA in food safety control and environmental monitoring.

    关键词： Turn off-on,Self-assembled zinc porphyrin,Ochratoxin A,Quantum dots

    更新于2025-09-16 10:30:52