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Inorganic-organic hybrid

Haowei Lin, Kai Chen, Mingke Li, Beibei Ji, Yaohui Jia, Xinyu Liu, Jinling Li, Weiqiang Song, Chunlong Guan
We demonstrate that a novel photodetector is constructed by CdS/PPV (poly(p-phenylene vinylene)) homogeneous hybrid nanowire arrays via a simple template-assisted electrochemical co-deposition approach. Owing to the well-matched energy levels between CdS and PPV, the recombination of photogenerated electrons and holes in CdS/PPV hybrid nanowire arrays is greatly inhibited. It is found that the homogeneous hybrid nanowire arrays exhibit remarkably enhanced photoelectric response and the ON/OFF ratio by 17 times compared to individual CdS component...
February 19, 2019: ACS Applied Materials & Interfaces
Alonso W P Sanches, Marco A T da Silva, Neusmar J A Cordeiro, Alexandre Urbano, Sidney A Lourenço
Methylammonium lead halide perovskite (CH3NH3PbI3) films, with high PbI2 concentration, were grown by the two-step spin coating method. The influence of the precursor concentration and annealing time on the optical and structural properties of the perovskite films was analyzed by optical absorption, photoluminescence, X-ray diffraction and scanning electron microscopy. The results showed that, in addition to the CH3NH3PbI3 and PbI2 phases, intermediate phases, such as (MA)2(DMF)2Pb3I8, were formed in the films, depending on the time and temperature of annealing, which can tune the optical absorption in the visible spectra...
February 18, 2019: Physical Chemistry Chemical Physics: PCCP
Zhenyue Wu, Xitao Liu, Chengmin Ji, Lina Li, Sasa Wang, Yu Peng, Kewen Tao, Zhihua Sun, Maochun Hong, Junhua Luo
Antiferroelectric materials have been regarded as promising candidate for electronic energy storage devices, due to their natural double polarization versus electric field ( P- E) hysteresis loops. Currently, two-dimensional organic-inorganic hybrid perovskites with structural diversity and tunability, have received blooming interests, whereas above-room-temperature antiferroelectrics are still unreported in this perovskite system. Herein, for the first time, we successfully acquire a two-dimensional Ruddlesden-Popper hybrid perovskite antiferroelectric, ((CH3 )2 CHCH2 NH3 )2 CsPb2 Br7 (1), which shows an above-room-temperature Curie temperature at 353 K, trigging by the synergistic dynamic motion of inorganic Cs atoms and organic i-BA cations...
February 18, 2019: Journal of the American Chemical Society
Thomas Rath, Dorothea Scheunemann, Roberto Canteri, Heinz Amenitsch, Jasmin Handl, Karin Wewerka, Gerald Kothleitner, Simon Leimgruber, Astrid-Caroline Knall, Saif A Haque
Bulk heterojunction solar cells based on conjugated polymer donors and fullerene-derivative acceptors have received much attention in the last decade. Alternative acceptors like organic non-fullerene acceptors or inorganic nanocrystals have been investigated to a lesser extent; however, they also show great potential. In this study, one focus is set on the investigation of the in situ growth of copper indium sulfide nanocrystals in a conjugated polymer matrix. This preparation method allows the fabrication of a hybrid active layer without long-chain ligands, which could hinder charge separation and transport...
January 28, 2019: Journal of Materials Chemistry. C, Materials for Optical and Electronic Devices
Tianyang Li, Wiley A Dunlap-Shohl, Eric W Reinheimer, Pierre Le Magueres, David B Mitzi
Hybrid organic-inorganic lead halide perovskites have attracted broad interest because of their unique optical and electronic properties, as well as good processability. Thermal properties of these materials, often overlooked, can provide additional critical information for developing new methods of thin film preparation using, for example, melt processing- i.e. , making films of hybrid perovskites by solidification of a thin layer of the melt liquid. We demonstrate that it is possible to tune the melting temperature of layered hybrid lead iodide perovskites over the range of more than 100 degrees by modifying the structures of alkylammonium-derived organic cations...
January 28, 2019: Chemical Science
Shuwen Zhao, Ying Tao, Yunxiang Chen, Yijie Zhou, Rong Li, Lingling Xie, Aibin Huang, Ping Jin, Shidong Ji
Vanadium dioxide is one kind of desirable infrared modulators for sensors because of its remarkable temperature-responsive infrared modulation ability via autogeneic metal-insulator transition. However, the detriments of poor chemical stability and narrow scope of extensive-researched application (e.g. smart windows) restrict its mass production. Here, we propose a VO2@MgF2@PDA inorganic-organic hybrid coated architecture for great enhancing the optical durability more than 13 times in contrast to the pristine VO2, meanwhile the transmittance difference between room and high temperature changed within 20% (decreasing from 25% to 20...
February 18, 2019: ACS Applied Materials & Interfaces
Byung-Wook Park, Sang Il Seok
Hybrid lead halide perovskite materials are used in solar cells and show efficiencies greater than 23%. Furthermore, they are applied in light-emitting diodes, X-ray detectors, thin-film transistors, thermoelectrics, and memory devices. Lead trihalide hybrid materials contain methylammonium (MA) or formamidinium (FA) (or a mixture), or long alkylammonium halides, as alternative organic cations. However, the intrinsic stability of hybrid lead halide perovskites is not very high, and they are chemically unstable when exposed to moisture, light, or heat because of their organic contents and low formation energies...
February 17, 2019: Advanced Materials
Satoshi Tanimoto, Izuka Nishii, Shokyoku Kanaoka
Chitosan/calcium carbonate core-shell type composite microparticles were fabricated via a biomineralization-inspired process with chitosan particles as starting materials. The obtained composite particles were spherical, and the diameter of the composite particles was larger than that of the chitosan particles. XRD measurement indicated that the shell of the composite particle had a crystalline structure. The shell fabrication process was carried out with polyacrylic acid (PAA) or polyglutamic acid (PGlu) as binder molecules between calcium carbonate and chitosan...
February 13, 2019: International Journal of Biological Macromolecules
Chahrazad El Abiad, Smaail Radi, Maria A F Faustino, M Graça P M S Neves, Nuno M M Moura
Porphyrins show great promise for future purification demands. This is largely due to their unique features as host binding molecules that can be modified at the synthetic level, and largely improved by their incorporation into inorganic based materials. In this study, we assessed the efficacy of a hybrid material obtained from the immobilization of 5,10,15,20-tetrakis(pentafluorophenyl)-porphyrin on silica surface to remove Pb(II), Cu(II), Cd(II), and Zn(II) ions from water. The new organic-inorganic hybrid adsorbent was fully characterized by adequate techniques and the results show that the hybrid exhibits good chemical and thermal stability...
February 14, 2019: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Qiang Fu, Claudia Draxl
Single-atom catalysts (SACs) combine the best of two worlds by bridging heterogeneous and homogeneous catalysis. The superior catalytic properties of SACs, however, can hardly be exploited without a suitable substrate. Here, we explore the possibility of using hybrid organic-inorganic perovskites as supporting materials for single transition-metal atoms. By means of first-principles calculations, we predict that single Pt atoms can be incorporated into methylammonium lead iodide surfaces by replacing the methylammonium groups at the outermost layer...
February 1, 2019: Physical Review Letters
Christin P Hollis, Alan K Dozier, Barbara L Knutson, Tonglei Li
We demonstrate a novel inorganic-organic crystalline nanoconstruct, where gold atoms were imbedded in the crystal lattices as defects of camptothecin nanocrystals, suggesting its potential use as simultaneous agents for cancer therapy and bioimaging. The incorporation of gold, a potential computed tomography (CT) contrast agent, in the nanocrystals of camptothecin was detected by transmission electron microscope (TEM) and further quantified by energy dispersive X-ray spectrometry (EDS) and inductively coupled plasma-optical emission spectrometers (ICP-OES)...
January 2019: Acta Pharmaceutica Sinica. B
Joohyung Park, Jong Kook Won, Jun-Gu Park, Seungwoo Yu, Jihyun An, Jongin Hong, Choongik Kim, Kang-Jun Baeg, Myung-Gil Kim
Herein, we demonstrate the preparation of a scalable bar-coated nanocomposite organic-inorganic hybrid film and developed robust barrier films for general purpose packaging. Using combinatory printing of polymers and nanocomposites by bar coating, a facile and effective barrier film fabrication method was developed. Based on a preliminary survey with several material combinations, a rationalized two-fold nanocomposite film was fabricated. The number of layers in the barrier film significantly modified oxygen barrier performance such that, for the 1 wt% ethylene vinyl alcohol (EVOH) intercalated film, the oxygen transmission rate (OTR) of the 5-layer sample was reduced to 31...
July 1, 2019: Journal of Nanoscience and Nanotechnology
Yaozu Zhang, Dongsheng Sun, Jixing Gao, Xiuni Hua, Xiaogang Chen, Guangquan Mei, Weiqiang Liao
Piezoelectric materials are a class of important functional materials applied in high-voltage sources, sensors, vibration reducer, actuators, motors, and so on. Herein, [(CH3)3S]3[Bi2Br9](1) is a brilliant semiconducting organic-inorganic hybrid perovskite-type non-ferroelectric piezoelectric with excellent piezoelectricity. Strikingly, the value of piezoelectric coefficient d33 is estimated about 18 pC/N. Such a large piezoelectric coefficient in non-ferroelectric piezoelectricity has been scarcely reported, comparable with those of typically one-composition non-ferroelectric piezoelectricity such as ZnO (3 pC/N) and much greater than those of most known typical materials...
February 12, 2019: Chemistry, An Asian Journal
Kousuke Nakada, Yuki Matsumoto, Yukihiro Shimoi, Koji Yamada, Yukio Furukawa
We present a Raman study on the phase transitions of organic/inorganic hybrid perovskite materials, CH₃NH₃PbX₃ (X = I, Br), which are used as solar cells with high power conversion efficiency. The temperature dependence of the Raman bands of CH₃NH₃PbX₃ (X = I, Br) was measured in the temperature ranges of 290 to 100 K for CH₃NH₃PbBr₃ and 340 to 110 K for CH₃NH₃PbI₃. Broad ν₁ bands at ~326 cm-1 for MAPbBr₃ and at ~240 cm-1 for MAPbI₃ were assigned to the MA⁻PbX₃ cage vibrations...
February 11, 2019: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Boya Zhao, Jie Liu, Zhi-Hua Li, Yao-Xuan Chen, Qian-Qing Ge, Yaqing Feng, Jin-Song Hu
Organic-inorganic hybrid perovskite single crystals have attracted much attention due to their superior optoelectronic properties. Herein, we report a facile vapor-solution sequential route to prepare single-crystalline nanosheets of hybrid lead triiodide perovskite. It is found that this two-step deposition is able to fabricate sizeable high-quality single-crystalline nanosheets with no need of delicate control of crystallization conditions such as concentration or temperature for normal single crystal growth...
June 1, 2019: Journal of Nanoscience and Nanotechnology
Jing Yang, Li Tian
Nickel-doped silica organic-inorganic hybrid (Ni/SiO₂) membranes based on tetraethylorthosilicate (TEOS) and methyltriethoxysilane (MTES) were prepared via a sol-gel process for H₂/CO₂ separation. The influence of calcination temperature and Ni-doping amount on the microstructure and surface free energy of Ni/SiO₂ materials was investigated. The permeance of H₂ and CO₂ and vapor stability of the membranes were tested. For the Ni/SiO₂ membrane, the optimal calcination temperature should be 350 °C and Ni/TEOS molar ratio is 0...
June 1, 2019: Journal of Nanoscience and Nanotechnology
Frank Weinhold, Clark R Landis, Eric D Glendening
What is now called "resonance theory" has a long and conflicted history. We first sketch the early roots of resonance theory, its heritage of diverse physics and chemistry conceptions, and its subsequent rise to reigning chemical bonding paradigm of the mid-20th-century. We then outline the alternative "natural" pathway to localized Lewis- and resonance-structural conceptions that was initiated in the 1950s, given semi-empirical formulation in the 1970s, recast in ab initio form in the 1980s, and successfully generalized to multi-structural "natural resonance theory" (NRT) form in the 1990s...
February 11, 2019: Journal of the American Chemical Society
Raja Bhaskar Kanth Siram, Mark V Khenkin, Angelica Niazov-Elkan, Anoop K M, Haim Weissman, Eugene A Katz, Iris Visoly-Fisher, Boris Rybtchinski
We report on utilizing free-standing hybrid perylenediimide/carbon nanotube (PDI/CNT) films fabricated in air as back contacts for fully inorganic perovskite solar cells (glass/FTO/dense TiO2/mesoporous TiO2/CsPbBr3/back electrode). The back contact electrode connection is performed by film transfer rather than by vacuum deposition or by wet processing, allowing the formation of highly homogeneous contacts under ambient conditions. The use of this novel electrode in solar cells based on CsPbBr3 resulted in efficiency of 5...
February 11, 2019: Nanoscale
Hai-Dan Wang, Xing-Fang Wang, Fang Su, Jian-Sheng Li, Lan-Cui Zhang, Xiao-Jing Sang, Zai-Ming Zhu
Carboxyethyltin and first-row transition metals (TMs) were firstly introduced into trivacant Keggin-type tungstoantimonate in an aqueous solution, leading to the formation of four crystalline organic-inorganic hybrid sandwich-type polyoxometalates (POMs), formulated as Na10-x-yKyHx[((TM)(H2O)3)2(Sn(CH2)2COO)2(SbW9O33)2]·nH2O (SbW9-TM-SnR, TM = Mn, Co, Ni, Zn; x = 1, 1, 0, 0; y = 0, 5, 5, 2; n = 18, 24, 24, 22, respectively). SbW9-TM-SnR exhibit high catalytic ability for the oxidation of cyclohexanol. Meanwhile, SbW9-TM-SnR were composited with polypyrrole (PPy) through an electropolymerization process, forming PPy-SbW9-TM-SnR, on which platinum (Pt) was further electro-deposited to prepare PPy-SbW9-TM-SnR/Pt for electrocatalytic methanol (CH3OH) oxidation in acid solution...
February 11, 2019: Dalton Transactions: An International Journal of Inorganic Chemistry
Kai Wang, Shilei Dai, Yiwei Zhao, Yan Wang, Chuan Liu, Jia Huang
Implementation of artificial intelligent systems with light-stimulated synaptic emulators may enhance computational speed by providing devices with high bandwidth, low power computation requirements, and low crosstalk. One of the key challenges is to develop light-stimulated devices that can response to light signals in a neuron-/synapse-like fashion. A simple and effective solution process to fabricate light-stimulated synaptic transistors (LSSTs) based on inorganic halide perovskite quantum dots (IHP QDs) and organic semiconductors (OSCs) is reported...
February 10, 2019: Small
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