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https://www.readbyqxmd.com/read/30320830/fast-and-low-power-thermo-optic-switch-based-on-organic-inorganic-hybrid-strip-loaded-waveguides
#1
Qiang Xu, Minghui Jiang, Donghai Niu, Xibin Wang, Lilei Wang, Kin Seng Chiang, Daming Zhang
We design and fabricate a thermo-optic waveguide switch based on the configuration of a balanced Mach-Zehnder interferometer optimized for fast operation. The structure of the waveguides consists of two core layers with the lower layer formed with the high-index organic-inorganic hybrid material DR1/SiO2 -TiO2 . The hybrid material allows the mode field to be confined in an area for fast heat removal, and the formation of index tapers to expand the mode field at the two ends of the device to facilitate butt-coupling with single-mode fibers...
October 15, 2018: Optics Letters
https://www.readbyqxmd.com/read/30318641/visible-and-nir-light-responsive-black-phosphorus-based-nanostructures-in-solar-fuel-production-and-environmental-remediation
#2
Rongjuan Feng, Wanying Lei, Gang Liu, Minghua Liu
Direct utilization of the full spectrum of renewable solar light, in particular the visible- and near-infrared (NIR) portions, is currently receiving a great deal of attention in solar-to-chemical energy conversion-a clean, economically, and environmentally sustainable process. Black phosphorus (BP), a newly emerging class of ultrathin 2D nanomaterials rediscovered in early 2014, fulfills this purpose due to its unique properties like high charge-carrier mobility and tunable direct-bandgap. To this end, the rational combinations of BP in the form of few-layer nanosheets or ultrasmall quantum dots with a range of organic and inorganic nanomaterials offer more versatile and robust hybrids and nanocomposites that are functional in solar fuel production and environmental remediation...
October 15, 2018: Advanced Materials
https://www.readbyqxmd.com/read/30312905/hybrid-inorganic-nonporous-silica-organic-alginate-core-shell-platform-for-targeting-a-cisplatin-based-pt-iv-anticancer-prodrug
#3
Mauro Ravera, Elisabetta Gabano, Diego Bonzani, Ilaria Zanellato, Aldo Arrais, Simone Cantamessa, Marco Biggiogera, Domenico Osella
Nonporous silica nanoparticles with an external shell containing the 3‑aminopropyl arm (SiNP) were further decorated with alginic acid (SiNP-ALG) as a potential biocompatible delivery system for Pt antitumor agents. Such particles were coupled with the prodrug (OC‑6‑44)‑acetato(β‑alaninato)diamminedichloridoplatinum(IV), 1, through the formation of amide bonds between the pendant carboxylate groups on SiNP-ALG and the free amino group of the complex. Cytosol extracted from tumor cells was able to quickly and efficiently reduce the Pt(IV) prodrug, and produces the active metabolite cisplatin...
October 2, 2018: Journal of Inorganic Biochemistry
https://www.readbyqxmd.com/read/30312853/investigating-chemical-and-structural-instabilities-of-lead-halide-perovskite-induced-by-electron-beam-irradiation
#4
Xuanyu Chen, Zhiwei Wang
Chemical and structural instabilities of lead halide perovskites remain a major obstacle to their large-scale applications in photovoltaic solar cells and optoelectronic devices. Herein we report on a comparative investigation of electron beam irradiation effects on (all-inorganic) CsPbI3 and (organic-inorganic hybrid) CH3 NH3 PbI3 halide perovskite thin films by transmission electron microscopy. Upon continuous electron beam irradiation with high dose rates, CsPbI3 exhibits rather rapid morphological change and compositional degradation within irradiated regions, which are attributed to the radiolysis effect and probably assisted by electron beam heating and Coulomb forces...
September 22, 2018: Micron: the International Research and Review Journal for Microscopy
https://www.readbyqxmd.com/read/30312792/molecular-insights-into-the-mechanism-and-the-efficiency-structure-relationship-of-phosphorus-removal-by-coagulation
#5
Yong-Bao Chu, Min Li, Jin-Wei Liu, Wei Xu, Shi-Han Cheng, Hua-Zhang Zhao
Types and structures of phosphorus compounds influence the removal of phosphorus by coagulation. Until now, the molecular-level interaction between coagulants and phosphorus (especially organophosphates) and the relationship between removal efficiency and phosphorus structure have not been clear. This work investigated the removal of phosphorus with different structures using conventional coagulants (poly aluminum chloride (PACl) and polymerized ferric sulfate (PFS)) and a novel covalently-bound inorganic-organic hybrid coagulant (CBHyC)...
October 5, 2018: Water Research
https://www.readbyqxmd.com/read/30310904/eurogels-a-ferromagnetic-semiconductor-with-a-porous-structure-prepared-via-the-assembly-of-hybrid-nanorods
#6
Bastian Trepka, Julian Stiegeler, Ilona Wimmer, Mikhail Fonin, Sebastian Polarz
EuO is unique, because it belongs to the few solids combining semiconducting properties (Egap = 1.1 eV) with native ferromagnetism. For future applications of EuO, e.g. as spin-filters or for sensors, one has to learn how defined nanostructures can be prepared. Unlike other ceramic oxides, there are no established soft-chemistry routes (e.g. sol-gel) towards EuO nanomaterials e.g. porous materials. This is due to the labile nature of the oxidation state Eu(+ii). We present a particle-based method leading to a EuO aerogel...
October 12, 2018: Nanoscale
https://www.readbyqxmd.com/read/30307456/novel-fully-reduced-phosphomolybdates-for-highly-efficient-removal-of-inorganic-hexavalent-chromium-and-the-organic-dye-methylene-blue
#7
Xuerui Tian, Lin Hou, Jiaojiao Wang, Xing Xin, Heng Zhang, Yuanyuan Ma, Yali Wang, Lina Zhang, Zhangang Han
New Na-bridged phosphomolybdates (H2en)12[{Na0.8K0.2(H2O)}2{Na[Mo6O12(OH)3(HPO4)2(PO4)2]2}2]·7H2O (1), (H2bpp)2[{Sr2(H2O)4}{Na3(H2O)10}{Na[Mo6O12(OH)3(HPO4)3(PO4)]2}]·2H2O (2), and (H2bpp)6 [{Ca2(H2O)4}{Na2(H2O)4}{Na[Mo6O12(OH)3(HPO4)3(PO4)]2}2] (3) (en = ethylenediamine, bpp = 1,3-bi(4-pyridyl)propane), were synthesized by a hydrothermal method and characterized. Single-crystal X-ray diffraction analysis revealed that the three hybrids were composed of fully reduced 'hourglass-shaped' {Na[PV4MoV6X31]2}n- (X = O/OH) clusters and N-containing organic cations...
October 11, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/30307011/facile-scalable-fabrication-of-ultra-thin-freestanding-sio-2-based-hybrid-nanosheets-with-multifunctional-properties
#8
Xinping Zhang, Huicheng Ren, Aihua He
Two-dimensional (2D) nanomaterials with unique features like a large surface-to-volume ratio and the quantum confinement effect have attracted great attention for applications in energy storage, catalysis, sensing, membranes, etc. Silica (SiO2)-based nanosheets, as members of the 2D material family, are extremely intriguing because of their unique electronic insulation, bio-compatibility and profound chemical and thermal stability. However, there is still a lack of available approaches for fabricating SiO2 nanosheets in a simple, large-scale and cost-effective fashion...
October 11, 2018: Nanoscale
https://www.readbyqxmd.com/read/30306988/tunable-upconversion-in-a-nanocrystal-organic-molecule-hybrid-reabsorption-vs-resonant-energy-transfer
#9
Chaojun Li, Xiaofeng Liu, Jianrong Qiu
Organic semiconductors, such as polycyclic aromatic hydrocarbons, are typically not responsive to near infrared (NIR) light due to their relatively large bandgaps. Here, we show that the NIR light at 980 nm can be efficiently converted to broadband visible upconversion (UC) emission by rubrene molecules in a solution dispersed with upconversion nanoparticles (UCNPs). Spectroscopic characterizations indicate that the sensitization of emission by rubrene molecules strongly depends on the location of the 4f levels of Er3+ ions and the interplay between reabsorption and Förster-type energy transfer...
October 11, 2018: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/30306653/organic-inorganic-hybrid-passivation-enables-perovskite-qleds-with-an-eqe-of-16-48
#10
Jizhong Song, Tao Fang, Jianhai Li, Leimeng Xu, Fengjuan Zhang, Boning Han, Qingsong Shan, Haibo Zeng
Perovskite quantum dots (QDs) with high photoluminescence quantum yields (PLQYs) and narrow emission peak hold promise for next-generation flexible and high-definition displays. However, perovskite QD films often suffer from low PLQYs due to the dynamic characteristics between the QD's surface and organic ligands and inefficient electrical transportation resulting from long hydrocarbon organic ligands as highly insulating barrier, which impair the ensuing device performance. Here, a general organic-inorganic hybrid ligand (OIHL) strategy is reported on to passivate perovskite QDs for highly efficient electroluminescent devices...
October 10, 2018: Advanced Materials
https://www.readbyqxmd.com/read/30299970/on-the-colloidal-stability-of-apolar-nanoparticles-the-role-of-ligand-length
#11
Debora Monego, Thomas Kister, Nicholas Kirkwood, Paul Mulvaney, Asaph Widmer-Cooper, Tobias Kraus
Inorganic nanoparticle cores are often coated with organic ligands to render them dispersible in apolar solvents. However, the effect of the ligand shell on the stability of the overall hybrid particle is not fully understood. In particular, it is not known how the length of an apolar alkyl ligand chain affects the stability of a nanoparticle dispersion against agglomeration. Here, we describe an unexpectedly nonlinear relation, with an inversion of the effect of ligand length on stability depending on core size...
October 9, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/30296165/hyperbolic-dispersion-arising-from-anisotropic-excitons-in-two-dimensional-perovskites
#12
Peijun Guo, Wei Huang, Constantinos C Stoumpos, Lingling Mao, Jue Gong, Li Zeng, Benjamin T Diroll, Yi Xia, Xuedan Ma, David J Gosztola, Tao Xu, John B Ketterson, Michael J Bedzyk, Antonio Facchetti, Tobin J Marks, Mercouri G Kanatzidis, Richard D Schaller
Excitations of free electrons and optical phonons are known to permit access to the negative real part of relative permittivities (ϵ^{'}<0) that yield strong light-matter interactions. However, negative ϵ^{'} arising from excitons has been much less explored. Via development of a dielectric-coating based technique described herein, we report fundamental optical properties of two-dimensional hybrid perovskites (2DHPs), composed of alternating layers of inorganic and organic sublattices. Low members of 2DHPs (N=1 and N=2) exhibit negative ϵ^{'} stemming from the large exciton binding energy and sizable oscillator strength...
September 21, 2018: Physical Review Letters
https://www.readbyqxmd.com/read/30295473/hybrid-metal-organic-framework-inorganic-nanocatalyst-toward-highly-efficient-discoloration-of-organic-dyes-in-aqueous-medium
#13
Kanwal Iqbal, Anam Iqbal, Alexander M Kirillov, Weisheng Liu, Yu Tang
Nanoscale metal-organic frameworks (NMOFs) represent a unique class of solids with superior adsorption, mass transport, and catalytic properties. In this study, a facile and novel approach was developed for the generation of hybrid Cu-NMOF/Ce-doped-Mg-Al-LDH nanocatalyst through in situ self-assembly and solvothermal synthesis of a 2D Cu-NMOF, [Cu2 (μ-OH)(μ4 -btc)(phen)2 ] n ·5 nH2 O {H3 btc, trimesic acid; phen, 1,10-phenanthroline}, on a cerium-doped Mg-Al layered double hydroxide (Ce-doped-Mg-Al-LDH) matrix...
October 8, 2018: Inorganic Chemistry
https://www.readbyqxmd.com/read/30289690/stretching-and-breaking-of-ultrathin-2d-hybrid-organic-inorganic-perovskites
#14
Qing Tu, Ioannis Spanopoulos, Poya Yasaei, Constantinos C Stoumpos, Mercouri G Kanatzidis, Gajendra S Shekhawat, Vinayak P Dravid
Two-dimensional (2D) hybrid organic-inorganic perovskites (HOIPs) are recent members of the 2D materials family with wide tunability, highly dynamic structural features, and excellent physical properties. Ultrathin 2D HOIPs and their heterostructures with other 2D materials have been exploited for study of physical phenomena and device applications. The in-plane mechanical properties of 2D ultrathin HOIPs are critical for understanding the coupling between mechanical and other physical fields and for integrated devices applications...
October 8, 2018: ACS Nano
https://www.readbyqxmd.com/read/30285290/mesoporous-organosilica-hollow-nanoparticles-synthesis-and-applications
#15
REVIEW
Zhaogang Teng, Wei Li, Yuxia Tang, Ahmed Elzatahry, Guangming Lu, Dongyuan Zhao
Hollow periodic mesoporous organosilicas (PMOs) with molecularly homogeneous organic functional groups in the inorganic pore walls are attracting more and more attention due to the high surface areas, tunable pore sizes, low densities, large cavities in the center, permeable thin shells, and versatile organic-inorganic hybrid frameworks, which make them promising in a variety of applications including adsorption, catalysis, drug delivery, and nanotheranostics. Herein, recent advances in the synthesis of hollow PMO nanoparticles with various organic moieties are summarized, and the mechanism and new insights of synthesis approaches, including hard-core templating methods, liquid-interface assembly methods, and the interfacial reassembly and transformation strategy are discussed in-depth...
October 4, 2018: Advanced Materials
https://www.readbyqxmd.com/read/30277659/temperature-difference-triggering-controlled-growth-of-all-inorganic-perovskite-nanowire-arrays-in-air
#16
Yaguang Wang, Muhammad Yasar, Ziyi Luo, Shasha Zhou, Yiwei Yu, Huiqiao Li, Rui Yang, Xiaoxia Wang, Anlian Pan, Lin Gan, Tianyou Zhai
All-inorganic perovskites have attracted increasing worldwide interest due to its significantly improved stability in atmospheric environment compared to organic-inorganic hybrid perovskites, which renders it infinitely applicable in many fields such as electronics, optoelectronics, and energy storage. However, all-inorganic perovskites have to confront the challenges from fabrication before their wide utilization in the aforementioned applications. Liquid-phase synthesis holds the advantage of mass production and easy modulation of composition but with the deficiencies of relatively low crystallinity and disordered products...
October 2018: Small
https://www.readbyqxmd.com/read/30277318/attaining-high-photovoltaic-efficiency-and-stability-with-multidimensional-perovskite
#17
Felix Utama Kosasih
The power conversion efficiency of organic-inorganic hybrid perovskite solar cells has soared over the past ten years, currently rivalling those of crystalline silicon and other thin film solar cells. Most of the research effort so far has been focused on three-dimensional (3D) perovskite crystals, producing devices with very high efficiency but poor operational and environmental stability. Two-dimensional (2D) Ruddlesden-Popper perovskite has recently shown its potential as a highly stable light absorber, albeit with low efficiency...
October 2, 2018: ChemSusChem
https://www.readbyqxmd.com/read/30277243/influence-of-polymeric-electrets-on-the-performance-of-derived-hybrid-perovskite-based-photo-memory-devices
#18
Ender Ercan, Jung-Yao Chen, Chien-Chung Shih, Chu-Chen Chueh, Wen-Chang Chen
Organic-inorganic hybrid perovskite has become one of the most important photoactive materials owing to its intense light-harvesting property as well as its facile solution processability. Besides its photovoltaic applications, a novel photo-programmed transistor memory was recently developed based on the device architecture of a floating-gate transistor memory using a polymer/perovskite blend as the gate dielectric with the non-volatile memory characteristics of decent light response, applicable On/Off current ratio, and long retention time...
October 21, 2018: Nanoscale
https://www.readbyqxmd.com/read/30277059/sub-2v-transfer-stamped-organic-inorganic-complementary-inverters-based-on-electrolyte-gated-transistors
#19
Kyung Gook Cho, Hyun Je Kim, Hae Min Yang, Kyoung Hwan Seol, Seung Ju Lee, Keun Hyung Lee
Organic/inorganic hybrid complementary inverters operating at low voltages (1 V or less) were fabricated by transfer-stamping organic p-type poly(3-hexylthiophene) (P3HT) and inorganic n-type zinc oxide (ZnO) electrolyte-gated transistors (EGTs). A semicrystalline homopolymer-based gel electrolyte, or an ionogel, was also transfer-stamped on the semiconductors for use as a high-capacitance gate insulator. For the ionogel stamping, the thermoreversible crystallization of phase-separated homopolymer crystals, which act as network cross-links, was employed to improve the contact between the gel and the semiconductor channel...
October 2, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/30265001/tarnishing-silver-metal-into-mithrene
#20
Brittany Trang, Matthew Yeung, Derek C Popple, Elyse A Schriber, Michael A Brady, Tevye R Kuykendall, J Nathan Hohman
Silver metal exposed to the atmosphere corrodes and becomes tarnished as a result of oxidation and precipitation of the metal as insoluble salt. Tarnish has so poor a reputation that the word itself connotes corruption and disrespectability; however, tarnishing is a facile synthetic approach for preparing thin metal-sulfide films on silver or copper metal that might be exploited to prepare more elaborate materials with desirable optoelectronic properties. In this work, we prepare luminescent semiconducting thin films of mithrene, a metal-organic chalcogenolate assembly, by replacing the tarnish-causing atmospheric sulfur source with diphenyl diselenide...
September 28, 2018: Journal of the American Chemical Society
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