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Selected gas response measurements using reduced graphene oxide decorated with nickel nanoparticles

Nano Materials Science 2021年第4期3卷 412-419页

作者： Ilka Simon Yulyan Haiduk Rolf Mtilhaupt Vladimir Pankov christoph janiak Institut für Anoganische Chemie und Strukturchemie Heinrich-Heine Universität Düsseldorf 40204DüsseldorfGermany Chemical Faculty Belarusian State UniversityLenningradskaya Str.14220050 MinskBelarus Freiburg Materials Research Center and Institute for Macromolecular Chemistry Albert-Ludwigs-UniversityFreiburg79104FreiburgGermany

The work reports the synthesis of nickel nanoparticles supported on thermally reduced graphene oxides(rGO)in the ionic liquid[BMIm][NTf_(2)]through microwave decomposition ***@rGO with the polymer poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate)(PEDOT:PSS)as binder was positively tested for its response towards the oxidizing gas nitrogen dioxide(10 ppm in air),the reducing gas carbon monoxide(3000 ppm in N_(2))and the volatile organic compound(VOC)acetone(35,000 ppm in air).The results from different gases were compared at different temperatures with the best results for NO_(2) at 200℃.Additionally,it is shown for NO_(2) gas that the Ni@rGO-PEDOT:PSS polymer composite gives better results than the rGO-PEDOT:PSS polymer *** the heat treatment the oxidation state of pure nickel nanoparticles were confirmed by powder diffraction.

关键词： Nickel nanoparticles Reduced graphene oxide Gas sensing Nanocomposite

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金属有机框架材料对[Fe(HB(pz)_3)_2]自旋转换行为的影响（英文）

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无机化学学报 2017年第8期33卷 1330-1338页

作者：赵田 Ishtvan Boldo christoph janiak 刘跃军湖南工业大学包装与材料工程学院先进包装材料与技术湖南省重点实验室株洲412007 德国杜塞尔多夫大学无机化学与结构化学研究所杜塞尔多夫d40225

通过在介孔结构金属有机框架材料MIL-101(Cr)和MIL-100(Al)的孔洞中合成自旋交叉化合物[Fe(HB(pz)_3)_2]的方法 ,可以得到SCO@MOF复合物。通过红外光谱(FTIR)、粉末X射线衍射(PXRD)、原子吸收光谱(AAS)以及气体吸附-脱附等进行了进一步... 详细信息

通过在介孔结构金属有机框架材料MIL-101(Cr)和MIL-100(Al)的孔洞中合成自旋交叉化合物[Fe(HB(pz)_3)_2]的方法 ,可以得到SCO@MOF复合物。通过红外光谱(FTIR)、粉末X射线衍射(PXRD)、原子吸收光谱(AAS)以及气体吸附-脱附等进行了进一步测试。通过变温磁测量对复合材料的温度诱导自旋转换行为的研究表明,复合材料的自旋转换行为发生改变甚至是消失了。复合材料的这一现象可以解释为[Fe(HB(pz)_3)_2]在MOF主体材料的孔洞中形成了一种新的结晶相,且孔壁压力将会阻碍[Fe(HB(pz)_3)_2]从低自旋态向高自旋态转变。不同SCO@MOF复合物得到了相似的自旋转换行为结果。这确认了当自旋交叉化合物在金属有机框架材料孔洞中形成时,MOFs材料的限制压力或基体效应对其自旋转换行为的影响显然是至关重要的。

关键词：自选交叉化合物 [Fe(HB(pz)3)2] 金属有机框架材料基体效应

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sp^(3)-like defect structure of hetero graphene-carbon nanotubes for promoting carrier transfer and stability

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Journal of Energy Chemistry 2021年第6期30卷 189-197,I0005页

作者： Shan-Shan Fan Ling Shen Yuan Dong Ge Tian Si-Ming Wu Gang-Gang Chang christoph janiak Ping Wei Jin-Song Wu Xiao-Yu Yang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing and School of Materials Science&EngineeringWuhan University of TechnologyWuhan 430070HubeiChina School of Chemistry Chemical Engineering and Life ScienceWuhan University of TechnologyWuhan 430070HubeiChina Institut für Anorganische Chemie und Strukturchemie Heinrich-Heine-Universität Düsseldorf40204 DüsseldorfGermany NRC(Nanostructure Research Centre) Wuhan University of TechnologyWuhan 430070HubeiChina Department of Engineering and Applied Sciences Harvard University CambridgeMA 02138United States

Three-dimensional(3 D) hybrid of nanocarbons is a very promising way to the high-performance design of electrocatalysis ***,sp^(3)-like defect structure,a combination of high strength and conduction of graphene and carbon nanotubes(CNTs) is rarely ***,3 D neural-like hybrids of graphene(from reduced graphene oxide) and carbon nanotubes(CNTs) have been integrated via sp^(3)-like defect structure by a hydrothermal *** sp^(3)-like defect structure endows 3 D nanocarbon hybrids with an enhanced carrier transfer,high structural stability,and electrocatalytic *** neural-like structure is shown to demonstrate a cascade effect of charges and significant performances regarding bio-electrocatalysis and lithium-sulfur energy *** concept and mechanism of "sp^(3)-like defect structure" are proposed at an atomic/nanoscale to clarify the generation of rational structure as well as the cascade electron transfer.

关键词： Graphene Carbon nanotubes sp^(3)-like defect structure Bio-electrocatalysis Lithium-sulfur batteries

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Biogenic Synthesis of Silver Nanoparticles Using Guava (<i>Psidium guajava</i>) Leaf Extract and Its Larvicidal Action against <i>Anopheles gambiae</i>

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Journal of Biomaterials and Nanobiotechnology 2020年第1期11卷 49-66页

作者： Agnes Antoinette Ntoumba Francois Eya’ane Meva Wolfgang Eyisap Ekoko Loick Pradel Kojom Foko Etoile Ngo Hondt Carsten Schlüsener Bastian Moll Gisele Etame Loe Philippe Belle Ebanda Kedi Jean Yves Sikapi Fouda christoph janiak Leopold Gustave Lehman Department of Animal Biology and Physiology Faculty of Science The University of Douala Douala Cameroon Department of Pharmaceutical Sciences Faculty of Medicine and Pharmaceutical Sciences The University of Douala Douala Cameroon Institute for Inorganic Chemistry and Structural Chemistry Heinrich-Heine-University Düsseldorf Universitätsstr 1 Düsseldorf Germany Organisation de Coordination pour la lutte contre les Endémies en Afrique Centrale (OCEAC) Yaoundé Cameroon

The progress in the field of nanotechnology has contributed to the development of tools for combating the most critical problems in developing countries. The requirements that such tools should meet are low-cost and resource settings, environmental protection, ease of use, and availability. The use of plant properties for the generation of nanoparticles (NPs), which serve as bioinsecticides to combat the plasticity and resistance of mosquitoes and parasites, is considered possible. Here, we report for the first time the larvicidal activity of silver (Ag) NPs (AgNPs) synthesized from Psidium guajava (P. guajava) extract, which targets the 4th instar larvae of Anopheles gambiae. Concentrations of AgNPs between 0 and 200 ppm were used and their LC50 at 24 h and 48 h were determined as 19.55 ppm and 8.737 ppm, respectively. The AgNPs were stable and highly effective against the larvae of A. gambiae and thereby we anticipate that they can be used to combat vector-borne diseases in developing countries.

关键词： Vector Control Anopheles gambiae Silver Nanoparticles Psidium guajava

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Stachytarpheta cayennensis Aqueous Extract,a New Bioreactor towards Silver Nanoparticles for Biomedical Applications

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Journal of Biomaterials and Nanobiotechnology 2019年第2期10卷 102-119页

作者： Francois Eya’ane Meva Joel Olivier Avom Mbeng Cecile Okalla Ebongue Carsten Schlusener Ulku Kokcam-Demir Agnes Antoinette Ntoumba Phillipe Belle Ebanda Kedi Etienne Elanga Evrard-Rudy Njike Loudang Moise Henri Julien Nko’o Edmond Tchoumbi Vandi Deli Christian Chick Nanga Emmanuel Albert Mpondo Mpondo christoph janiak Department of Pharmaceutical Sciences Faculty of Medicine and Pharmaceutical SciencesUniversity of DoualaDoualaCameroon Institute for Inorganic Chemistry and Structural Chemistry Heinrich-Heine-University DusseldorfDusseldorfGermany Clinical Biology Laboratory General Hospital of DoualaDoualaCameroon Department of Animal Biology and Physiology Faculty of ScienceUniversity of DoualaDoualaCameroon

This study reports the preparation and characterization of silver nanoparticles synthesized by the mediation of the plant weed Stachytarpheta cayennensis through solution method. Ultraviolet visible spectroscopy (UV-Vis) determines the presence of nanoparticles in the solution. Infrared spectroscopy (IR) proves organic molecules at the particles interface. Powder X-ray diffraction (PXRD) provides phase composition and crystallinity. Shape was showed by scanning electron microscopy (SEM), and energy dispersive X-ray spectroscopy (EDX) demonstrated the elemental mapping of the silver nanoparticles. Hydrogen peroxide scavenging and phosphomolybdenum antioxidant assays, egg albumin denaturation anti-inflammation study, and the formation mechanism complete the study. The particles have been found composed of pure silver Ag and silver chloride AgCl nanocrystallites. The average crystallite sizes were found to be 13 nm and 20 nm for Ag and AgCl respectively. A Rietveld refinement based XRD pattern data followed by Williamson-Hall plot allows a size and strain analysis. Based on SEM, spherical agglomerates materials were formed and EDX proved the presence of Cl- ions. The reaction formation mechanism of Ag and AgCl is proposed to be simultaneous and competitive. The silver nanoparticles moderately inhibit the denaturation of egg albumin and exhibit antioxidant action;hence, the nanoparticles could be considered as a potential source for biomedical applications.

关键词： Silver Nanoparticles Stachytarpheta cayennensis Size and Strain Anti-Oxidant Anti-Inflammation

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