Qingyun Liu

Shandong University of Science and Technology, Tsingtao, Shandong Sheng, China

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Publications (25)88.16 Total impact

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    ABSTRACT: Novel red-emissive carbon-dots (C-dots) with broad absorption in the region from 400 to 750 nm are prepared from polythiophene phenylpropionic acid. Upon near infrared laser irradiation, the red-emissive C-dots show strong photoacoustic response and high photothermal conversion efficiency (η, ≈ 38.5%). These unique properties enable the C-dots to act as multifunctional fluorescent, photoacoustic, and thermal theranostics for simultaneous diagnosis and therapy of cancer. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
    Advanced Materials 06/2015; 27(28). DOI:10.1002/adma.201500323 · 17.49 Impact Factor
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    ABSTRACT: Meso-tetrakis(4-carboxyphenyl)-porphyrin-functionalized γ-Fe2O3 nanoparticles (H2TCPP-γ-Fe2O3) were successfully prepared by one-pot method under hydrothermal conditions and were found to possess intrinsic peroxidase-like activity. The H2TCPP-γ-Fe2O3 nanocomposites can catalytically oxidize peroxidase substrate 3,3',5,5'-tetramethylbenzidine (TMB) in the presence of H2O2 to produce a blue color reaction, which can be easily observed by the naked eye. Furthermore, kinetic studies indicate that the H2TCPP-γ-Fe2O3 nanocomposites have an even higher affinity to TMB than that of the natural enzyme, horseradish peroxidase (HRP). On the basis of the high activity, the reaction provides a simple, sensitive and selective method for colorimetric detection of H2O2 over a range of 10-100μM with a minimum detection limit of 1.73μM. Moreover, H2TCPP-γ-Fe2O3/glucose oxidase (GOx)/TMB system provides a novel colorimetric sensor for glucose and shows good response toward glucose detection over a range of 5-25μM with a minimum detection limit of 2.54μM. The results indicated that it is a simple, cheap, convenient, highly selective, sensitive and easy handling colorimetric assay. Results of a fluorescent probe suggest that the catalase-mimic activity of the H2TCPP-γ-Fe2O3 nanocomposites effectively catalyze the decomposition of H2O2 into H2O and O2. Copyright © 2015 Elsevier B.V. All rights reserved.
    Materials Science and Engineering C 05/2015; 55. DOI:10.1016/j.msec.2015.05.028 · 3.09 Impact Factor
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    ABSTRACT: Porphyrin functionalized Co3O4 nanoparticles were first prepared via a facile one-pot hydrothermal method. The functionalized nanoparticles were characterized by X-ray diffraction and transmission electron microscopy. Fourier transform infrared spectra revealed the coordination interaction between porphyrin molecules and Co3O4. The high yield of prophyrin functionalized Co3O4 nanoparticles is more than 90%. The phase, morphology and size of as-prepared nanoparticles were dramatically affected by the ratio of solvents, temperature and porphyrins with different substituents, respectively. Experimental results revealed that ethanol and the appropriate temperature were necessary for the formation of single-phase Co3O4. Furthermore, a probable growth mechanism of the formation of porphyrin functionalized Co3O4 nanoparticles was proposed.
    Materials Science and Engineering B 04/2015; 198. DOI:10.1016/j.mseb.2015.03.017 · 2.17 Impact Factor
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    ABSTRACT: A high-speed vibration milling (HSVM) method was applied to synthesize water-dispersible silicon quantum dots (SiQDs). Highly reactive free radicals (HOOCCH2CH2•) produced from an acyl peroxide under HSVM conditions reacted with hydrophobic Si chips to produce highly water-dispersible SiQDs, which were characterized in detail by spectroscopic and microscopic techniques. Further experiments showed that the SiQDs are photostable, biocompatible, and suitable for long-term fluorescent cellular imaging. Our results provide a new methodology for large-scale synthesis of water-dispersible SiQDs, which are promising for various optoelectronic and biological applications.
    RSC Advances 04/2015; 5(44):35291-35296. DOI:10.1039/C5RA02474A · 3.84 Impact Factor
  • Qingyun Liu · Renren Zhu · Hui Du · Hui Li · Yanting Yang · Qingyan Jia · Bing Bian ·
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    ABSTRACT: 5,10,15,20-Tetrakis(4-carboxyl pheyl)-porphyrin (H2TCPP) functionalized chain-like Co3O4 nanoparticles (NPs) were prepared by a facile two-step method. The H2TCPP-Co3O4 nanocomposites were demonstrated to display enhanced peroxidase-like activity than that of pure Co3O4 nanoparticles without modification with H2TCPP molecules, catalyzing oxidation of peroxidase substrate 3,3',5,5'-tetramethyl-benzidine (TMB) in the presence of H2O2 to produce a blue color reaction. Furthermore, H2TCPP-Co3O4 nanocomposites showed typical Michaelis-Menten kinetics and higher affinity to H2O2 and TMB than that of pure Co3O4 NPs alone. Based on H2TCPP-Co3O4 nanocomposites, a simple, sensitive and selective calorimetric method with TMB as the substrate for the detection of H2O2 and glucose was successfully established. This calorimetric method can be used for the calorimetric detection of H2O2 with a low detection limit of 4 x 10(-7) mol.L-1 and a dynamic range of 1 x 10(-6) mol.L-1 to 75 x 10(-6) mol.L-1. This method was designed to detect glucose when combined with glucose oxidase at a low detection limit of 8.6 x 10(-7) mol.L-1 and a dynamic range of 1 x 10(-6) mol.L-1 to 10 x 10(-6) mol.L-1. Results of a fluorescent probe suggested that the peroxidase-mimic activity of the H2TCPP-Co3O4 nanocomposites effectively catalyzed the decomposition of H2O2 into [(OH)-O-center dot] radicals.
    Materials Science and Engineering C 10/2014; 43:321–329. DOI:10.1016/j.msec.2014.07.032 · 3.09 Impact Factor
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    ABSTRACT: The 5,10,15,20-tetrakis (4-carboxyl phenyl)-porphyrin-functionalized CdS nanocomposites (H2TCPP-CdS NCs) were successfully prepared by a facile one-step method under mild conditions and were extensively characterized by X-ray diffraction, transmission electron microscopy, Fourier transform infrared spectroscopy, UV-vis diffuse reflectance. Rhodamine B (RhB) dye, a common industrial pollutant, was used as a model pollutant to study its photocatalytic activity under exposure to solar light. The results showed that the as-prepared H2TCPP-CdS NCs exhibited enhanced photocatalytic activity for the degradation of RhB dissolved in water under exposure to solar light. The degradation efficiency of RhB catalyzed by the H2TCPP-CdS NCs under exposure to solar light is higher than when exposed to UV light. The degradation and decolorization of RhB were influenced by different amounts of porphyrin in preparation of H2TCPP-CdS NCs, the amount of catalyst, and the initial concentration of dye solution and pH. Moreover, the recycling experiments confirmed the relative stability and reutilization of the catalyst.
    Materials Science and Engineering B 10/2014; 188:106–113. DOI:10.1016/j.mseb.2014.05.002 · 2.17 Impact Factor
  • Qingyun Liu · Qingyan Jia · Renren Zhu · Qian Shao · Dongmei Wang · Peng Cui · Jiechao Ge ·
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    ABSTRACT: Here, we describe the design of a novel mimic peroxidase, nanocomposites composed by 5,10,15,20-tetrakis(4-carboxyl phenyl)-porphyrin (H2TCPP) and cadmium sulfide (CdS). The H2TCPP-CdS nanocomposites can catalyze oxidation of substrate 3,3,5,5-tetramethylbenzidine (TMB) in the presence of H2O2 and form a blue product which can be seen by the naked eye in 5 min. The mechanism of the catalytic reaction originated from the generation of hydroxyl radical (center dot OH), which is a powerful oxidizing agent to oxidize TMB to produce a blue product. Then, we developed a colorimetric method that is highly sensitive and selective to detect glucose, combined with glucose oxidase (GOx). The proposed method allowed the detection of H2O2 concentration in the range of 4 x 10(-6)-1.4 x 10(-5) M and glucose in the range of 1.875 x 10(-5)-1 x 10(-4) M with detectable H2O2 concentration as low as 4.6 x 10(-7) M and glucose as low as 7.02 x 10(-6) M, respectively. The results provided the theoretical basis of practical application in glucose detecting and peroxidase mimetic enzymes.
    Materials Science and Engineering C 09/2014; 42:177–184. DOI:10.1016/j.msec.2014.05.019 · 3.09 Impact Factor
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    ABSTRACT: NiO nanoparticles (NPs) and 5,10,15,20-tetrakis(4-carboxyl pheyl)-porphyrin (H2TCPP) functionalized NiO nanoparticles (H2TCPP-NiO nanocomposites) have been prepared by a facile method and characterized by powder X-ray diffraction (XRD), transmission electron microscope (TEM) and Fourier transform infrared spectra (FTIR), respectively. NiO NPs and H2TCPP-NiO nanocomposites have been proven to function as peroxidase mimetics that can catalyze the reaction of peroxidase substrate 3,3',5,5'-tetramethylbenzidine (TMB) in the presence of H2O2 to produce a blue color reaction. Kinetic analysis indicated that the catalytic behavior was in accord with typical Michaelis-Menten kinetics. And these nanoparticles also exhibited strong affinity for the substrates of 3,3,5,5-tetramethylbiphenyl dihydrochloride (TMB). Experimental results showed that H2TCPP-NiO NPs exhibited a high sensitivity and a low detection limit towards H2O2 (8.0×10(-6)M). The H2TCPP-NiO NPs/glucose oxidase (GOx)/TMB system provides a novel colorimetric sensor for glucose and shows good response toward glucose detection over arrange of 0.05-0.50mM with a limit of detection 2.0×10(-5)M. Fluorescence probe experiments demonstrated that the peroxidase-like activity of H2TCPP-NiO NPs originated from the generation of OH radical. Thus it may provide great potential applications in biomedicine, biotechnology and environmental chemistry.
    Biosensors & Bioelectronics 08/2014; 64C:147-153. DOI:10.1016/j.bios.2014.08.062 · 6.41 Impact Factor
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    ABSTRACT: 5,10,15,20-Tetralds(4-carboxyphenyl)-porphyrin-functionalized Fe3O4 nanocomposites (H2TCPP-Fe3O4) were successfully prepared by a simple two-step method. These nanocomposites exhibited ultra-high peroxidase-like activity compared with pure Fe3O4 nanoparticles. Colorless peroxidase substrate 3,3,5,5-tetramethylbenzidine (TMB) was changed by H2O2 to its blue oxidized state. Kinetic studies indicated that the H2TCPP-Fe3O4 nanocomposites exhibited enhanced affinity toward H2O2 with a higher catalytic activity than Fe3O4 nanoparticles alone. Results of a fluorescent probe suggested that the catalase-mimic activity of the H2TCPP-Fe3O4 nanocomposites effectively catalyzed the decomposition of H2O2 into hydroxyl radicals. A simple, sensitive, and selective visual and calorimetric method with TMB as the substrate was designed to detect glucose when combined with glucose oxidase. This colorimetric method can be used for colorimetric detection of H2O2 with a minimum detection limit of 1.07 x 10(-6) M and a dynamic range of 5 x 10(-6) mol L-1 to 8 x 10(-5) mol . L-1. This method can also be used to detect glucose at a minimum detection limit of 2.21 x 10(-6) M and a dynamic range of 25 x 10(-6) mol . L-1 to 5 x 10(-6) mol . L-1. Furthermore, the robustness of the nanocomposites makes them suitable for a wide range of applications in biomedicine and environmental chemistry fields.
    Materials Science and Engineering C 08/2014; 41:142–151. DOI:10.1016/j.msec.2014.04.038 · 3.09 Impact Factor
  • Fei Yang · Lu Jing · Lisha Ji · Qingyun Liu · Xiaomei Zhang ·
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    ABSTRACT: Two metal-organic framework compounds composed of cerium ions coordinated with tetra(4-carboxyphenyl) porphyrin H2TCPP (3) and its cobalt congener CoTCPP (4), namely H2TCPP/Ce (1) and CoTCPP/Ce (2) were synthesized. Their self-assembly behaviors were systematically investigated using electronic absorption spectra, scanning electron microscopy (SEM), X-ray diffraction (XRD) analysis, and energy dispersive X-ray spectroscopy (EDX). The formation of H2TCPP/Ce (1) nanoparticles with an average diameter of 500 nm depended mainly on the Ce-O coordination bond between the additive cerium ion and the oxygen atom of the carboxy group of the porphyrin 3 molecule. However, additionally formed Co-C coordination bonds between the central cobalt ion of 4 to the carbon atom of the adjacent porphyrinato 4 ring, in combination with Ce-O coordination bond between the additive cerium ion and the oxygen atom of the carboxy group of porphyrinato 4 molecules, induced the formation of CoTCPP/Ce (2) nanoparticles with apparently smaller average diameters (380 nm). After calcining the corresponding H2TCPP/Ce (1) and CoTCPP/Ce (2) metal-organic frameworks, two types of morphology-preserved CeO2 were obtained, both of which showed excellent catalytic properties towards the oxidation of CO to CO2.
    CrystEngComm 05/2014; 16(20):4274. DOI:10.1039/c3ce42600a · 4.03 Impact Factor
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    ABSTRACT: Volvox-like Cdx Zn1-x S solid solutions with a cubic zinc blend structure were synthesized through a template-free ethylene glycol process. Cd(Ac)2 ⋅2 H2 O, Zn(Ac)2 ⋅2 H2 O, and thiourea are used as the starting materials and dissolved in ethylene glycol. These reaction precursors and solvent not only contributed to control over the formation of the volvox-like spherical geometry, but also exerted vigorous domination for existence of cubic-phase Cdx Zn1-x S nanostructures. As-prepared volvox-like Cdx Zn1-x S nanospheres have a diameter of around 100 nm with extensional shells. These samples show excellent photocatalytic H2 evolution activity from water splitting under visible-light irradiation without any cocatalyst or scaffolding, owing to their tunable band gap, cubic zinc blend structure, and unique hierarchical porous structure with a high surface area (as high as 95.2 m(2) g(-1) ).
    Chemistry - An Asian Journal 03/2014; 9(3). DOI:10.1002/asia.201301428 · 4.59 Impact Factor
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    ABSTRACT: Various nanostructures of 5,10,15,20-tetrakis(4-carboxyl phenyl)-porphyrin (H2TCPP) can be easily synthesized by a surfactant-assisted self-assembly (SAS) method at different temperatures. When the DMF solution of porphyrin monomer was injected into cetyltimethylammonium bromide (CTAB) aqueous solution by a syringe, diverse H2TCPP nanostructures dependent on the different temperatures, including hollow nanospheres, solid nanospheres and nanospheres with holes, were successfully obtained. As a result, the suitable concentration of the CTAB aqueous solution used to form nanostructues of porphyrin ranges from 0.15 to 0.2mM. The various morphologies of porphyrin nanostructures were characterized by transmission electron microscopy (TEM), high resolution transmission electron microscopy (HRTEM) and scanning electron microscopy (SEM). UV-vis adsorption spectra showed that the micro-/nano-aggregate properties of porphyrin transformed from H-aggretates to J-aggregates during the process of self-assembly of porphyrin at different temperatures. Fluorescence spectra revealed a greater fluorescence quenching of various micro-/nano-aggregatess of porphyrin formed at different temperatures in aqueous solution, compared to the DMF solution of porphyrin monomer.
    12/2013; 33(8):4944-4951. DOI:10.1016/j.msec.2013.08.015
  • Jing Tian · Lu Jing · Lisha Ji · Congcong Zhang · Qingyun Liu · Xiaomei Zhang ·
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    ABSTRACT: Two phthalocyanine derivatives with eight peripheral chiral diethyleneglycol mono-(S)-2-methylbutyl ether moieties on the β-position of the phthalocyanine ring were prepared from the tetramerization of corresponding phthalonitriles, promoted by organic base 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU). The self-assembly behavior of metal free phthalocyanine 1 and its copper congener 2 have been comparatively investigated by electronic absorption and circular dichroism (CD) spectroscopy, scanning electron microscopy (SEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The metal free phthalocyanine 1 self-assembles into the right-handed screw-like aggregates (ca. 10 μm length, 6 μm width, and 1.5 μm helical pitch), while, phthalocyaninato copper 2 self-assembled into left-handed fibrous aggregates (ca. 25 μm length, 1 μm width, and 0.7 μm helical pitch). These results indicated the effect of metal-coordination bonds on the morphology and handedness of the self-assembled nanostructures. Further, excellent nonlinear optical (NLO) properties of both compounds were also revealed by a Z-scan experiment, which expand their applications in nonlinear optics.
    RSC Advances 10/2013; 3(44):22461. DOI:10.1039/c3ra44164d · 3.84 Impact Factor
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    ABSTRACT: A simple hydrothermal process was adopted to self-assembly prepare high infrared reflective antimony trioxide with three-dimensional flower-like microstructures. The morphologies of antimony trioxide microstructures were characterized by X-ray diffractometry (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and high resolution transmission electron microscopy (HRTEM) respectively. It is also found that experimental parameters, such as NaOH concentration, surfactant concentration and volume ratio of ethanol–water played crucial roles in controlling the morphologies of Sb2O3 microstructures. A possible growth mechanism of flower-like Sb2O3 microstructure was proposed based on the experimental data. UV–vis–NIR spectra verified that the near infrared reflectivity of the obtained flower-like microstructures could averagely achieve as 92% with maximum reflectivity of 98%, obviously higher than that of other different morphologies of antimony trioxide microstructures. It is expected that the flower-like Sb2O3 nanostructures have some applications in optical materials and heat insulation coatings.
    Journal of Solid State Chemistry 04/2013; 200:136–142. DOI:10.1016/j.jssc.2013.01.027 · 2.13 Impact Factor
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    ABSTRACT: Nanotubes of metal-free 5,10,15,20-tetrakis(4-chlorophenyl)porphyrin (H2TClPP) are fabricated by using nanoporous anodized aluminum oxide (AAO) membrane as the template. The morphology and structure of the nanotubes are investigated by using transmission electron microscopy (TEM) and field emission scanning electron microscopy (FESEM). It is found that the outer diameter of the nanotubes matches well with the pore diameter of the AAO membranes, and interestingly, the porphyrin molecules packed orderly within the nanotube walls. The properties of the nanotubes of H2TClPP have been investigated by using UV-vis absorption spectroscopy and steady-state fluorescence spectroscopy. Absorption spectra reveal the formation of J aggregates of the porphyrin molecules within the nanotubes. While fluorescence spectra show a significant fluorescence quenching for the nanotubes dispersed in a water solution in comparison to the solution of H2TClPP in chloroform, due to strong supramolecular π–π and van der Waals interactions.
    RSC Advances 01/2013; 3(8):2765-2769. DOI:10.1039/C2RA21364H · 3.84 Impact Factor
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    Qingyun Liu · Qingru Zhao · Yong Li · Xueying Wang ·
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    ABSTRACT: Highly ordered nanorods of CdCl2·H2O were found to grow on the Langmuir film surface of the sandwich-type (phthalocyaninato) [tetrakis(4-pyridyl)porphryrinato] cerium double-decker complex [Ce(Pc)(TPyP)]. Experimental results revealed the important template role the Langmuir monolayer of [Ce(Pc)(TPyP)] played during the formation of well orientated CdCl2·H2O nanorods because of the metal–ligand coordination interaction between the Cd2+ cations in the subphase solution and the pyridyl groups of the double-decker molecules. The CdCl2·H2O nanorods formed were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), high resolution transmission electron microscopy (HRTEM), selected area electron diffraction (SAED), atomic force microscopic (AFM) and X-ray photoelectron spectroscopy (XPS).
    CrystEngComm 01/2012; 14(3):1105-1110. DOI:10.1039/C1CE05702B · 4.03 Impact Factor
  • Qingyun Liu · Qingru Zhao · Hongguo Liu · Yong Li ·
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    ABSTRACT: Ordered molecular assemblies of novel sandwich-type heteroleptic (porphyrinato) (phthalocyaninato) europium complex (a double-decker compound) molecules were fabricated by Langmuir-Blodgett technique. The monolayer behaviors of the complex molecules were investigated using a series of techniques including surface pressure-area isotherm measurement, UV-vis spectroscopy, polarized UV-vis spectroscopy, and low-angle X-ray diffractometry. The results indicated that double-decker complex molecules form well-ordered and stable monolayers with a face-to-face configuration and edge-on arrangement to the water surface at the air-water interface as well as J-aggregates in lamellar multilayers on solid substrates. The orientation angle of the macrocycle in the double-decker compound with respect to the quartz slice surface in the LB films have been determined on the basis of the polarized absorbance and were found to be ca. 42 degrees.
    Advanced Materials Research 01/2012; 399-401:1097-1101. DOI:10.4028/www.scientific.net/AMR.399-401.1097
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    ABSTRACT: Porous copper oxide (CuO) hollow microspheres have been successfully fabricated by using carbon spheres as templates. The products were characterized by scanning electron microscopy (SEM), X-ray diffractometry (XRD) and Fourier transform infrared spectroscopy (FTIR). The influences of different experimental parameters on the morphology of CuO structures have been investigated in detail and the possible formation mechanism of porous CuO hollow microspheres has also been proposed. The specific surface area of the hollow spheres with 74.805 m2/g is measured by BET method. Barrett-Joyner-Halenda (BJH) calculations for the pore size distribution, derived from desorption data, reveal that the average pore radius is 8.56 nm, and the total pore volume (r = 1686.1 A, P/P0 = 0.994296) is 0.107257 cc/g. UV-vis absorption spectrum shows quantum size effect of porous CuO hollow microspheres. Furthermore, the porous CuO hollow microspheres exhibit high efficiency for photodegradation of a sample organic dye, Rhodamine B (RhB), under UV light.
    Journal of Nanoscience and Nanotechnology 11/2011; 11(11):10271-7. DOI:10.1166/jnn.2011.5005 · 1.56 Impact Factor
  • Qingyun Liu · Yong Li · Hongguo Liu · Jianzhuang Jiang · Yongzhong Bian ·
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    ABSTRACT: Interfacial assembly of sandwich mixed (phthalocyaninato)(porphyrinato) rare earth triple-decker complexes [(Pc)Eu(Pc)Eu(TPyP)] (1) and [(TPyP)Sm(Pc)Sm(TPyP)] (2) (Pc = phthalocyaninate, TPyP = meso-tetrakis(4-pyridyl)porphyrinate) has been comparatively studied at the air/pure water and the air/CdCl2 aqueous solution subphase interfaces. Surface pressure-area isotherms revealed the remarkable increase of limiting mean molecular area of the triple-deckers with the presence of Cd2+, suggesting the occurrence of in situ interfacial coordination. The formation of coordination bonds between the pyridyl groups of TPyP macrocycles in the triple-deckers and Cd2+ ions from the subphase was further supported by FT-IR spectroscopic data. Electronic absorption measurements showed the formation of J-aggregates of the triple-decker molecules in the interfacial assembled films.
    Materials Science and Engineering C 07/2011; 31(5):950-953. DOI:10.1016/j.msec.2011.02.020 · 3.09 Impact Factor
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    ABSTRACT: Silver dendritic nanostructures and nanoplates were prepared at the solid/liquid interfaces via electroless deposition. Langmuir monolayers of 5,10,15,20-tetra-4-oxy(2-stearic acid) phenyl porphyrin (TSPP) and arachidic acid (AA) were formed at the air/AgNO3 aqueous solution interface. These nanostructures were produced when carbon-coated copper grids were covered on the Langmuir monolayers at lower (<20 °C) and higher (20–50 °C) temperature, respectively, and the branches are composed of parallel aligned nanobelts with their (110) face parallel to the interface. The formation of the nanostructures should be attributed to the galvanic reduction of Ag+ ions by copper, the electronic conductivity of the carbon layer, the templating effect of the Langmuir monolayer, and the non-equilibrium growth and aggregation of silver nanoparticles at the interface. This is a convenient avenue to produce metal nanostructures.
    Colloids and Surfaces A Physicochemical and Engineering Aspects 01/2010; 353(2-3):166-171. DOI:10.1016/j.colsurfa.2009.11.008 · 2.75 Impact Factor

Publication Stats

97 Citations
88.16 Total Impact Points


  • 2009-2015
    • Shandong University of Science and Technology
      Tsingtao, Shandong Sheng, China
  • 2006-2014
    • Shandong University
      • • Department of Chemistry
      • • Key Laboratory for Colloid and Interface Chemistry
      Chi-nan-shih, Shandong Sheng, China
  • 2013
    • Ocean University of China
      • College of Chemistry and Chemical Engineering
      Tsingtao, Shandong Sheng, China