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Inorganic-organic hybrid

Yang Li, Jovana V Milić, Amita Ummadisingu, Ji-Youn Seo, Jeong-Hyeok Im, Hui-Seo Kim, Yuhang Liu, M Ibrahim Dar, Shaik M Zakeeruddin, Peng Wang, Anders Hagfeldt, Michael Grätzel
Three-dimensional (3D) perovskite materials display remarkable potential in photovoltaics owing to their superior solar-to-electric power conversion efficiency, with current efforts focused on improving stability. Two-dimensional (2D) perovskite analogues feature greater stability toward environmental factors, such as moisture, owing to a hydrophobic organic cation that acts as a spacer between the inorganic layers, which offers a significant advantage over their comparatively less stable 3D analogues. Here, we demonstrate the first example of a formamidinium (FA) containing Dion-Jacobson 2D perovskite material characterized by the BFA n-1 Pb n I3 n+1 formulation through employing a novel bifunctional organic spacer (B), namely 1,4-phenylenedimethanammonium (PDMA)...
December 12, 2018: Nano Letters
José Luis Pineda-Delgado, Cynthia K Gutiérrez B, Sandra Rivas, N Arjona, L G Arriaga, Abraham Ulises Chavez-Ramirez
Hybrid inorganic-organic Nafion membranes modified with metal oxides (typically TiO<sub>2</sub>, ZrO<sub>2</sub>, WO<sub>3</sub>) are a good alternative for fuel cells applications. However, one of their main limitations is associated with their relative low proton conductivity at temperatures above 80°C. In this work, we overcome this issue using HfO<sub>2</sub> as a filler. HfO<sub>2</sub> was prepared by a sol-gel method varying the HfCl<sub>2</sub> precursor loadings from 1 to 3 wt...
December 11, 2018: Nanotechnology
Ali B Abou Hammad, Amany M Elnahrawy, Ahmed M Youssef
Modification of chitosan with cross-linkers, blends with various kinds of polymers, nanoparticles and new organic-inorganic hybrid composites in order to obtain some improved properties attached more attention nowadays due to their good sensitivity in changing electrical and optical properties. In the current work modified hybrid chitosan/calcium aluminosilicate (CH/CAS) nanocomposite membranes and doped with (3, 5 & 7 mol%) Al2 O3 nanoparticles were synthesized via sol-gel process in acidic conditions, which can be efficiently employed to capture CO2 gas at lower and moderate temperatures...
December 8, 2018: International Journal of Biological Macromolecules
Xinyue Wang, Jiaqi Meng, Xia Yang, An Hu, Yuxin Yang, Yihang Guo
Metal-free g-C3N4 is the promising candidate for the next generation visible light-responsive photocatalyst, however, high recombination probability of the photogenerated charge carriers on g-C3N4 limits its photocatalytic activity. To further increase the intrinsic photocatalytic activity of g-C3N4, here perylene tetracarboxylic diimide-g-C3N4 heterojunctions (PDI/GCN) are prepared by one-step imidization reaction between perylene tetracarboxylic dianhydride (PTCDA) and g-C3N4 in aqueous solution. By the combination of various testing results it is confirmed that the surface hybridization of PTCDA and g-C3N4 in the PDI/GCN heterojunctions via O=C‒N‒C=O covalent bonds occurs at lower PTCDA-to-g-C3N4 weight percentage...
December 10, 2018: ACS Applied Materials & Interfaces
Bas G P van Ravensteijn, Raghida Bou Zerdan, Dongjin Seo, Nicholas A Cadirov, Takumi Watanabe, Jeffrey A Gerbec, Craig J Hawker, Jacob N Israelachvili, Matthew E Helgeson
Polymer-based lubricant additives for friction reduction, wear protection or viscosity improvement have been widely studied. However, single additives achieving all three functions are rare. To address this need, we have explored the combination of polymer topology with organic-inorganic hybrid chemistry to simultaneously vary the temperature- and shear-dependent properties of polymer additives in solution and at solid surfaces. A topological library of lubricant additives, based on statistical copolymers of stearyl methacrylate (SMA) and methyl methacrylate (MMA), ranging from linear to branched star architectures, was prepared using ruthenium-catalyzed controlled radical polymerization...
December 10, 2018: ACS Applied Materials & Interfaces
Menghua Zhu, Weiwei Liu, Weijun Ke, Lisha Xie, Pei Dong, Feng Hao
Tin dioxide (SnO2) as an efficient electron transport layer (ETL) has been demonstrated for emerging high performance organic-inorganic hybrid perovskite solar cells (PSCs). However the low temperature solution-processed SnO2 usually results in high trap-state density and current-voltage hysteresis. Here we reported an effective strategy to solve this problem by incorporation graphene ink to the low temperature processed SnO2 for planar structure PSCs. The electron extraction efficiency has been significantly improved with graphene doped SnO2 ETL coupled with attenuated charge recombination at the ETL/perovskite interface...
December 10, 2018: ACS Applied Materials & Interfaces
Qiang Guo, Fanglong Yuan, Bing Zhang, Shijie Zhou, Jin Zhang, Yiming Bai, Louzhen Fan, Tasawar Hayat, Ahmed Alsaedi, Zhan'ao Tan
Organic-inorganic hybrid perovskites are prone to defect formation due to iodine and methylamine ion/defect migration, leading to the formation of lots of defects at the perovskite surface and grain boundaries. Passivation of the defects is an effective method to improve the power conversion efficiency (PCE) and stability of perovskite solar cells (PSCs). To achieve stable passivation, the interaction between the perovskite and additive materials should be taken into consideration. In this work, we for the first time introduced carbon quantum dots (CQDs) as an additive for the stabilization of MAPbI3 via passivation of the grain boundaries of the perovskite...
December 7, 2018: Nanoscale
Feyza Karasu, Luca Müller, Hassan Ridaoui, Mohammed Ibn ElHaj, Göran Flodberg, Christian Aulin, Lars Axrup, Yves Leterrier
Cellulose nanofibrils (CNF) can be produced in the form of thin, transparent and flexible films. However, the permeability of such materials to oxygen and water vapor is very sensitive to moisture, which limits their potential for a variety of packaging and encapsulation applications. Diffusion barrier coatings were thus developed to reduce the access of water molecules to enzymatically pre-treated and carboxymethylated CNF substrates. The coatings were based on UV curable organic-inorganic hybrids with epoxy, tetraethylorthosilicate (TEOS) and 3-glycidoxypropyltrimethylenesilane (GPTS) precursors and additional vapor formed SiNx layers...
2018: Frontiers in Chemistry
Moritz Hieronymus Futscher, Thorsten Schultz, Johannes Frisch, Maryline Ralaiarisoa, Ezzeldin Metwalli, Marco Nardi, Peter Muller-Buschbaum, Norbert Koch
Hybrid inorganic/organic semiconductor heterojunctions are candidates to expand the scope of purely organic or inorganic junctions in electronic and optoelectronic devices. Comprehensive understanding of bulk and interface doping on the junction's electronic properties is therefore desirable. In this work, we elucidate the energy level alignment and its mechanisms at a prototypical hybrid pn-junction comprising ZnO (n-type) and p-doped N,N'-di(1-naphthyl)-N,N'-diphenyl-(1,1'-biphenyl)-4,4'-diamine (α-NPD) as semiconductors, using photoelectron spectroscopy...
November 22, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
Gan Zhang, Cristobal Verdugo-Escamilla, Duane Choquesillo-Lazarte, Juan Manuel García-Ruiz
Fabrication of mineral multi-textured architectures by self-organization is a formidable challenge for engineering. Current approaches follow a biomimetic route for hybrid materials based on the coupling of carbonate and organic compounds. We explore here the chemical coupling of silica and carbonate, leading to fabrication of inorganic-inorganic biomimetic structures known as silica-carbonate biomorphs. So far, biomorphic structures were restricted to orthorhombic barium, strontium, and calcium carbonate. We demonstrate that, monohydrocalcite a hydrous form of calcium carbonate with trigonal structure can also form biomorphic structures, thus showing biomorphic growth is not dictated by the carbonate crystal structure...
December 6, 2018: Nature Communications
Wei Jun Chen, Kai Bin Chu, Jun Ling Song
Organic-inorganic hybrid lead-based perovskite crystal materials have been widely studied due to their excellent optical-electronic properties. However, the toxicity of lead limits their widespread use. Here, a lead-free perovskite-type compound, tetrakis(1,2,3-trimethylimidazolium) di-μ3 -iodido-tetra-μ2 -iodido-decaiodidotetrabismuth(III), (C6 H11 N2 )4 [Bi4 I16 ], has been successfully synthesized by a simple solvothermal method. It exhibits a zero-dimensional (0D) tetrameric structure, including edge-sharing [Bi4 I16 ]4- distorted octahedra...
December 1, 2018: Acta Crystallographica. Section C, Structural Chemistry
Damian Rosiak, Andrzej Okuniewski, Jarosław Chojnacki
Two products of the reactions of CuI with 1-benzoyl-3-(4-bromophenyl)thiourea and with 1-benzoyl-3-(2-iodophenyl)thiourea have been obtained and characterized, namely poly[[[1-benzoyl-3-(4-bromophenyl)thiourea-κS]-μ3 -iodido-copper(I)] acetone hemisolvate], {[CuI(C14 H11 BrN2 OS)]·0.5C3 H6 O}n , and poly[μ4 -iodido-μ3 -iodido-[N-(benzo[d]thiazol-2-yl)benzamide-κN]dicopper(I)], [Cu2 I2 (C14 H10 N2 OS)]n . Their structures, determined by single-crystal X-ray diffraction analysis, exhibit different stoichiometries and molecular organizations; however, both compounds are polymeric and possess close Cu...
December 1, 2018: Acta Crystallographica. Section C, Structural Chemistry
Swati Parbhakar, Reetam Kaushik, Firasat Hussain
A series of 12 inorganic-organic hybrid 4f-substituted arsenotungstates decorated with 3d-based complexes along with acetate bridging, viz. {[Cu2 (H2 O)(1,10-phen)2 (μ-CH3 COO)2 ]4 [Ln2 (H2 O)2 (μ-CH3 COO)2 (α-AsW11 O39 )2 ]}2- (LnIII = Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu), have been synthesized. These compounds were isolated using a one-pot synthetic strategy with copper, lanthanoid, trilacunary arsenotungstate and 1,10-phenanthroline as precursors. They were characterized using various analytical techniques, such as single-crystal X-ray diffraction (SC-XRD), powder XRD (PXRD), Fourier transform IR (FT-IR) spectroscopy, UV-Vis spectroscopy and thermogravimetric analysis (TGA)...
December 1, 2018: Acta Crystallographica. Section C, Structural Chemistry
Papri Chakraborty, Abhijit Nag, Amrita Chakraborty, Thalappil Pradeep
Supramolecular chemistry is a major area of chemistry that utilizes weaker non-covalent interactions between molecules, including hydrogen bonding, van der Waals, electrostatic, π···π, and C-H···π interactions. Such forces have been the basis of several molecular self-assemblies and host-guest complexes in organic, inorganic, and biological systems. Atomically precise nanoclusters (NCs) are materials of growing interest that display interesting structure-property correlations. The evolving science of such systems reaffirms their molecular behavior...
December 3, 2018: Accounts of Chemical Research
Donatas Gesevičius, Antonia Neels, Sergii Yakunin, Erwin Hack, Maksym V Kovalenko, Frank Nüesch, Jakob Heier
The superweak tetrakis(nonafluoro-tert-butoxy)aluminate coordinating anion was employed to introduce pseudo-gas-phase conditions to the 2-[5-(1,3-dihydro-1,3,3-trimethyl-2H-indol-2-ylidene)-1,3-pentadien-1-yl]-1,3,3-trimethyl-3H-indolium chromophore. The resulting formation of a photoactive organic-inorganic hybrid salt has led to a highly stabilized excited state of the organic chromophore mainly due to the minimized lattice energy and Coulomb interactions. These highly beneficial features caused by the well dispersed negative charge of the anion have led to an enhanced neat spin-casted film fluorescence intensity, prolonged fluorescence lifetime, smooth thin film surfaces and a record power photovoltaic efficiency of 3...
November 28, 2018: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
Shuiyuan Wang, Chunsheng Chen, Zhihao Yu, Yongli He, Xiaoyao Chen, Qing Wan, Yi Shi, David Wei Zhang, Hao Zhou, Xinran Wang, Peng Zhou
Just as biological synapses provide basic functions for the nervous system, artificial synaptic devices serve as the fundamental building blocks of neuromorphic networks; thus, developing novel artificial synapses is essential for neuromorphic computing. By exploiting the band alignment between 2D inorganic and organic semiconductors, the first multi-functional synaptic transistor based on a molybdenum disulfide (MoS2 )/perylene-3,4,9,10-tetracarboxylic dianhydride (PTCDA) hybrid heterojunction, with remarkable short-term plasticity (STP) and long-term plasticity (LTP), is reported...
November 28, 2018: Advanced Materials
Hong Jiang, Jiangshan Feng, Huan Zhao, Guijun Li, Guannan Yin, Yu Han, Feng Yan, Zhike Liu, Shengzhong Frank Liu
All-inorganic CsPbX3 -based perovskites, such as CsPbI2 Br, show much better thermal and illumination stability than their organic-inorganic hybrid counterparts. However, fabrication of high-quality CsPbI2 Br perovskite film normally requires annealing at a high temperature (>250 °C) that is not compatible with the plastic substrate. In this work, a Lewis base adduct-promoted growth process that makes it possible to fabricate high quality CsPbI2 Br perovskite films at low temperature is promoted. The mechanism is attributed to synthesized dimethyl sulfoxide (DMSO) adducts which allow a low activation energy route to form CsPbI2 Br perovskite films during the thermal annealing treatment...
November 2018: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
Yuze Lin, Bo Chen, Yanjun Fang, Jingjing Zhao, Chunxiong Bao, Zhenhua Yu, Yehao Deng, Peter N Rudd, Yanfa Yan, Yongbo Yuan, Jinsong Huang
Identifying the origin of intrinsic instability for organic-inorganic halide perovskites (OIHPs) is crucial for their application in electronic devices, including solar cells, photodetectors, radiation detectors, and light-emitting diodes, as their efficiencies or sensitivities have already been demonstrated to be competitive with commercial available devices. Here we show that free charges in OIHPs, whether generated by incident light or by current-injection from electrodes, can reduce their stability, while efficient charge extraction effectively stabilizes the perovskite materials...
November 26, 2018: Nature Communications
Mirosław Mączka, Anna Gągor, Maciej Ptak, Dagmara Stefańska, Adam Sieradzki
We report the synthesis, crystal structure, and thermal, dielectric, optical and phonon properties of a new two-dimensional (2D) cadmium(ii) complex [(C3H7)4N][Cd(N(CN)2)3]. Our results show that this compound crystallizes in a two-dimensional monoclinic structure, with the space group P2/n, with ordered tetrapropylammonium cations and disorder of some dicyanamide linkers. It undergoes a structural phase transition at 245 K into another low-temperature (LT) monoclinic structure, with the space group P21/n. X-ray diffraction, dielectric, IR and Raman studies show that freezing of the dca motions stands at the origin of the phase transition...
November 26, 2018: Physical Chemistry Chemical Physics: PCCP
Yang Liu, Chun-Li Zhu, Xiao-Yuan Zheng, Liu-Lei Qin, Shuang-Xi Yang, Zun-Qi Liu
An organic-inorganic hybrid compound with an extensive three-dimensional (3D) crystal structure, (3-nitroanilinium)2 (18-crown-6)2 (H2 PO4 )2 (H3 PO4 )3 (H2 O) ( 1 ), was synthesized under slow evaporation conditions. Differential scanning calorimetry measurements indicated that 1 underwent a reversible phase transition at ca 231 K with a hysteresis width of 10 K. Variable-temperature X-ray single-crystal diffraction revealed that the phase transition of 1 can be ascribed to coupling of pendulum-like motions of its nitro group with proton transfer in O-H···O hydrogen bonds of the 3D framework...
October 2018: Royal Society Open Science
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