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Song F.,Shandong University | Ma P.,Shandong University | Ma P.,Jinan Academy of Agricultural science | Chen C.,Shandong University | And 3 more authors.
Journal of Colloid and Interface Science | Year: 2016

Highly ordered nanotubes of 5, 10, 15, 20-tetrakis(4-aminophenyl)porphyrin zinc (ZnTAP) are fabricated by using nanoporous anodized aluminum oxide (AAO) membrane as the template. Electronic absorption spectra, fluorescence spectra, transmission electron microscope (TEM), scanning electronic microscopy (SEM), low-angle X-ray diffraction (XRD) techniques are adopted to characterize these nanotubes. The highly ordered nanotubes of ZnTAP show good conductivity and present an efficient gas sensor platform for the ultrasensitive detection of NO2 under room temperature. The proposed sensor shows high sensitivity, reproducibility and fast response/recovery behavior, and provides a promising avenue for improving the sensing performance. © 2016 Elsevier Inc.

Kong L.,Shandong Academy of Agricultural Sciences | Wang F.,Jinan Academy of Agricultural science | Zhang R.,Shandong Provincial Key Laboratory of Crop Genetic Improvement | Feng B.,Shandong Academy of Agricultural Sciences | And 3 more authors.
International Journal of Agriculture and Biology | Year: 2012

Pre-anthesis-synthesized proteins stored in the vegetative organs of cereal crops are re-mobilized and transferred to the grains. In this study, winter wheat (Triticum aestivum L.) was grown at levels of 225 kg N ha-1 (normal) and 330 kg N ha-1 (high) to investigate the effects of excessive N rates on the N re-mobilization from vegetative organs to the developing grains and on the grain protein yield. At a high N dose, the activities of the major flag leaf proteases were greatly decreased ~8-24 days after anthesis. From the beginning of the grain filling to the maturity, the post-anthesis flag leaf protein contents reduced by 80.50% and 70.40% at normal and high N rates, respectively (P < 0.05). The wheat flag leaves grown under high N conditions had a higher residual N at maturity than those grown under normal N conditions. Thus, up to maturity, the flag leaf N translocation efficiency was 67.4% in wheat exposed to a high N rate, significantly lower than the 73.8% of the plants exposed to a normal N rate (P < 0.05). Consequently, the grain protein content was not significantly increased with high N fertilization. In conclusion, the application of excessive N inhibits the proteolysis and decreases the export of flag leaf-stored protein to the developing grains and therefore, may not improve the protein yield in wheat. © 2012 Friends Science Publishers.

Lu G.,University of Science and Technology Beijing | Kong X.,China University of Petroleum - East China | Ma P.,Jinan Academy of Agricultural science | Wang K.,University of Science and Technology Beijing | And 2 more authors.
ACS Applied Materials and Interfaces | Year: 2016

An amphiphilic mixed (phthalocyaninato) (porphyrinato) europium(III) triple-decker complex [Pc(OPh)8]Eu[Pc(OPh)8]Eu[TP(C≡CCOOH)PP] (1) with potential ambipolar semiconducting HOMO and LUMO energy levels has been designed, synthesized, and characterized. The OFET devices fabricated by quasi-Langmuir-Shäfer (QLS) technique at the air/water interface with nanoparticle morphology display hole mobility of 7.0 × 10-7 cm2 V-1 s-1 and electron mobility of 7.5 × 10-7 cm2 V-1 s-1, which reflects its ambipolar semiconducting nature. However, the performance of the devices fabricated via a "phase-transfer" method from n-hexane with one-dimensional nanoribbon morphology was significantly improved by 3-6 orders of magnitude in terms of hole and electron mobilities, 0.11 and 4 × 10-4 cm2 V-1 s-1, due to the enhanced interaction in the direction perpendicular to the tetrapyrrole rings associated with the formation of a dimeric supramolecular structure building block depending on the intermolecular hydrogen bonding between the neighboring triple-decker molecules in the one-dimensional nanoribbons. © 2016 American Chemical Society.

Wu Y.,University of Jinan | Ma P.,Jinan Academy of Agricultural science | Liu S.,University of Jinan | Chen Y.,University of Jinan | Chen Y.,China University of Petroleum - East China
New Journal of Chemistry | Year: 2016

Two novel amphiphilic porphyrin derivatives, 5-(benzo-(4-(2-(2-hydroxy)ethoxy)ethoxy))-10,15,20-triphenylporphyrinato zinc complex [ZnT(OC2H4OC2H4OH)PP] (1) and 5-(benzo-(4-(2-(4,10-N,N-15-crown-5)ethoxy)))-10,15,20-triphenylporphyrinato zinc complex [ZnT(OC2H4NN15C5)PP] (2), were designed, synthesized, and characterized by a range of spectroscopic methods. Their electrochemistry was studied by differential pulse voltammetry (DPV). Highly ordered films of 1 and 2 were fabricated by a solution-based quasi-Langmuir-Shäfer (QLS) technique, and were characterized by electronic absorption spectroscopy, IR spectroscopy, X-ray diffraction, atomic force microscopy (AFM) and current-voltage (I-V) measurements. Experimental results revealed that J-type aggregates are formed in the QLS film of 1 and 2. The crystallinity and general molecular order in the film of 1 were improved more effectively than in 2 due to its stronger intermolecular interactions. Furthermore, the conductivity of the QLS film of 1 was approximately 1 order of magnitude larger than that of 2. This indicates a significant effect of peripheral groups on the conducting behavior of porphyrins. In addition, the gas sensing behavior of the QLS films of 1 and 2 toward the electron acceptor gas, NO2, was investigated at concentrations 200 and 800 ppm, respectively. The sensitivity, stability, and reproducibility follow the order 1 > 2, revealing the effect of intermolecular interaction, film structure/morphology, and low-lying LUMO energy level on sensing performance. Unexpectedly, a decreased current response towards NO2 for the QLS films of both 1 and 2 was obtained for the first time, which unambiguously demonstrated the n-type semiconducting nature of 1 and 2. The present result represents not only the first example of n-type metalloporphyrin-based thin solid films obtained by a solution-based method, but more importantly provides an efficient way to enhance the performance of n-channel organic semiconductors through the combination of molecular design and the film fabrication technique. © The Royal Society of Chemistry and the Centre National de la Recherche Scientifique 2016.

Ma P.,Shandong Agricultural University | Ma P.,Jinan Academy of Agricultural science | Lv L.,Test Center for Agri Product Quality of Jinan | Zhang M.,Shandong Agricultural University | And 3 more authors.
Journal of Porous Materials | Year: 2015

A novel diimide-linked, iron(III) containing porous organic polymer (FePPOP) was designed and synthesized by the raise-by-one-story method using iron(III)tetraaminophthalocyanine and 3,4,9,10-perylene tetracarboxylic dianhydride. The yielded polymer has been fully characterized by IR, X-ray diffraction, scanning electron microscopy, thermal gravimetric analysis and nitrogen sorption isotherm measurements. FePPOP has unique morphological properties e.g. amorphous, insoluble, multilayered microporous structure. It also served as an efficient heterogeneous catalyst in the oxidation reaction of benzyl alcohol to benzaldehyde under mild reaction condition with a large turnover number as high as 960. The present work showcased a group of structure–function relationship among molecular structure, porous organic polymer structure, and catalyst functional properties. It would attract great research interest in the catalysis applications of a new class of porous organic polymers in organic reactions. © 2015 Springer Science+Business Media New York

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