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Journal of Materials Chemistry. C, Materials for Optical and Electronic Devices

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https://www.readbyqxmd.com/read/28515937/dicyano-and-tetracyanopentacene-foundation-of-an-intriguing-new-class-of-easy-to-synthesize-organic-semiconductors
#1
Florian Glöcklhofer, Andreas Petritz, Esther Karner, Michael J Bojdys, Barbara Stadlober, Johannes Fröhlich, Miriam M Unterlass
Cyanated pentacenes are very promising candidate materials for ambipolar and n-type transistors. However, only a few examples have been obtained to date - all requiring lengthy, multi-step processes. Herein, we present the first preparation of 5,7,12,14-tetracyanopentacene (TCP) and a facile, scaled-up preparation of 6,13-dicyanopentacene (DCP). Both compounds are prepared by a one-pot synthesis using cheap quinones as starting materials. Detailed crystallographic investigations evince that the bulk assemblies of both cyanated pentacenes are dominated by non-covalent interactions, resulting in a dense, stable, face-to-face packing and in an intriguing packing motif for TCP...
March 14, 2017: Journal of Materials Chemistry. C, Materials for Optical and Electronic Devices
https://www.readbyqxmd.com/read/28496981/electron-injection-and-scaffold-effects-in-perovskite-solar-cells
#2
Miguel Anaya, Wei Zhang, Bruno Clasen Hames, Yuelong Li, Francisco Fabregat-Santiago, Mauricio E Calvo, Henry J Snaith, Hernán Míguez, Iván Mora-Seró
In spite of the impressive efficiencies reported for perovskite solar cells (PSCs), key aspects of their working principles, such as electron injection at the contacts or the suitability of the utilization of a specific scaffold layer, are not yet fully understood. Increasingly complex scaffolds attained by the sequential deposition of TiO2 and SiO2 mesoporous layers onto transparent conducting substrates are used to perform a systematic characterization of both the injection process at the electron selective contact and the scaffold effect in PSCs...
January 21, 2017: Journal of Materials Chemistry. C, Materials for Optical and Electronic Devices
https://www.readbyqxmd.com/read/27933162/photoexcited-state-properties-of-carbon-dots-from-thermally-induced-functionalization-of-carbon-nanoparticles
#3
Yin Hu, Mohamad M Al Awak, Fan Yang, Sijia Yan, Qingwu Xiong, Ping Wang, Yongan Tang, Liju Yang, Gregory E LeCroy, Xiaofang Hou, Christopher E Bunker, Linxi Xu, Nicholas Tomlinson, Ya-Ping Sun
Carbon dots are small carbon nanoparticles with various surface passivation schemes, in which more effective has been the deliberate chemical functionalization of the nanoparticles for brighter fluorescence emissions, though the synthesis method is more tedious and subject to some limitations in the selection of functionalization molecules. Another more popular synthesis method has been the carbonization of organic species, with the method being more efficient and versatile, but less controllable in the synthesis and for the desired dot structure and performance...
November 28, 2016: Journal of Materials Chemistry. C, Materials for Optical and Electronic Devices
https://www.readbyqxmd.com/read/28133537/enhanced-fluorescence-properties-of-carbon-dots-in-polymer-films
#4
Yamin Liu, Ping Wang, K A Shiral Fernando, Gregory E LeCroy, Halidan Maimaiti, Barbara A Harruff-Miller, William K Lewis, Christopher E Bunker, Zhi-Ling Hou, Ya-Ping Sun
Carbon dots of small carbon nanoparticles surface-functionalized with 2,2'-(ethylenedioxy)bis(ethylamine) (EDA) were synthesized, and the as-synthesized sample was separated on an aqueous gel column to obtain fractions of the EDA-carbon dots with different fluorescence quantum yields. As already discussed in the literature, the variations in fluorescence performance among the fractions were attributed to the different levels and/or effectiveness of the surface functionalization-passivation in the carbon dots...
August 7, 2016: Journal of Materials Chemistry. C, Materials for Optical and Electronic Devices
https://www.readbyqxmd.com/read/27774150/a-single-source-precursor-approach-to-solution-processed-indium-arsenide-thin-films
#5
Peter Marchand, Sanjayan Sathasivam, Benjamin A D Williamson, David Pugh, Salem M Bawaked, Sulaiman N Basahel, Abdullah Y Obaid, David O Scanlon, Ivan P Parkin, Claire J Carmalt
This paper reports the synthesis of the novel single-source precursor, [{(MeInAs (t) Bu)3}2(Me2InAs( (t) Bu)H)2] and the subsequent first report of aerosol-assisted chemical vapour deposition of InAs thin films. Owing to the use of the single-source precursor, highly crystalline and stoichiometric films were grown at a relatively low deposition temperature of 450 °C. Core level XPS depth profiling studies showed some partial oxidation of the film surface, however this was self-limiting and disappeared on etch profiles...
July 28, 2016: Journal of Materials Chemistry. C, Materials for Optical and Electronic Devices
https://www.readbyqxmd.com/read/28496980/silver-induced-reconstruction-of-an-adeninate-based-metal-organic-framework-for-encapsulation-of-luminescent-adenine-stabilized-silver-clusters
#6
Dries Jonckheere, Eduardo Coutino-Gonzalez, Wouter Baekelant, Bart Bueken, Helge Reinsch, Ivo Stassen, Oliver Fenwick, Fanny Richard, Paolo Samorì, Rob Ameloot, Johan Hofkens, Maarten B J Roeffaers, Dirk E De Vos
Bright luminescent silver-adenine species were successfully stabilized in the pores of the MOF-69A (zinc biphenyldicarboxylate) metal-organic framework, starting from the intrinsically blue luminescent bio-MOF-1 (zinc adeninate 4,4'-biphenyldicarboxylate). Bio-MOF-1 is transformed to the MOF-69A framework by selectively leaching structural adenine linkers from the original framework using silver nitrate solutions in aqueous ethanol. Simultaneously, bright blue-green luminescent silver-adenine clusters are formed inside the pores of the recrystallized MOF-69A matrix in high local concentrations...
May 21, 2016: Journal of Materials Chemistry. C, Materials for Optical and Electronic Devices
https://www.readbyqxmd.com/read/27358738/a-novel-design-strategy-for-nanoparticles-on-nanopatterns-interferometric-lithographic-patterning-of-mms6-biotemplated-magnetic-nanoparticles
#7
S M Bird, O El-Zubir, A E Rawlings, G J Leggett, S S Staniland
Nanotechnology demands the synthesis of highly precise, functional materials, tailored for specific applications. One such example is bit patterned media. These high-density magnetic data-storage materials require specific and uniform magnetic nanoparticles (MNPs) to be patterned over large areas (cm(2) range) in exact nanoscale arrays. However, the realisation of such materials for nanotechnology applications depends upon reproducible fabrication methods that are both precise and environmentally-friendly, for cost-effective scale-up...
May 14, 2016: Journal of Materials Chemistry. C, Materials for Optical and Electronic Devices
https://www.readbyqxmd.com/read/27358737/transition-metal-nitride-based-thin-films-as-novel-energy-harvesting-materials
#8
Per Eklund, Sit Kerdsongpanya, Björn Alling
The last few years have seen a rise in the interest in early transition-metal and rare-earth nitrides, primarily based on ScN and CrN, for energy harvesting by thermoelectricity and piezoelectricity. This is because of a number of important advances, among those the discoveries of exceptionally high piezoelectric coupling coefficient in (Sc,Al)N alloys and of high thermoelectric power factors of ScN-based and CrN-based thin films. These materials also constitute well-defined model systems for investigating thermodynamics of mixing for alloying and nanostructural design for optimization of phase stability and band structure...
May 14, 2016: Journal of Materials Chemistry. C, Materials for Optical and Electronic Devices
https://www.readbyqxmd.com/read/27398216/solubilised-bright-blue-emitting-iridium-complexes-for-solution-processed-oleds
#9
Adam F Henwood, Ashu K Bansal, David B Cordes, Alexandra M Z Slawin, Ifor D W Samuel, Eli Zysman-Colman
Combining a sterically bulky, electron-deficient 2-(2,4-difluorophenyl)-4-(2,4,6-trimethylphenyl)pyridine (dFMesppy) cyclometalating C(∧)N ligand with an electron rich, highly rigidified 1,1'-(α,α'-o-xylylene)-2,2'-biimidazole (o-xylbiim) N(∧)N ligand gives an iridium complex, [Ir(dFMesppy)2(o-xylbiim)](PF6), that achieves extraordinarily bright blue emission (Φ PL = 90%; λ max = 459 nm in MeCN) for a cationic iridium complex. This complex is compared with two reference complexes bearing 4,4'-di-tert-butyl-2,2'-bipyridine, and solution-processed organic light emitting diodes (OLEDs) have been fabricated from these materials...
May 7, 2016: Journal of Materials Chemistry. C, Materials for Optical and Electronic Devices
https://www.readbyqxmd.com/read/28603621/temperature-dependent-shape-responsive-fluorescent-nanospheres-for-image-guided-drug-delivery
#10
Shawn He, George Tourkakis, Oleg Berezin, Nikolay Gerasimchuk, Hairong Zhang, Haying Zhou, Asaf Izraely, Walter J Akers, Mikhail Y Berezin
Temperature-responsive nanoparticles used in conjunction with hyperthermia promise to provide synergistic effects for increasing drug efficacy. We propose a near-infared (NIR) fluorescent system based on a upper critical solution temperature (UCST) polymer, ISP2, integrated with a NIR fluorescent dye HITC for in vivo tracking. The system forms a nanoparticle that increases its volume as temperature increases, similar to the expansion of a Hoberman sphere. The nanospheres nearly doubled in size, from 80 nm to 140 nm, during a temperature increase from 40°C to 60°C...
April 14, 2016: Journal of Materials Chemistry. C, Materials for Optical and Electronic Devices
https://www.readbyqxmd.com/read/28491320/push-pull-dioxaborine-as-fluorescent-molecular-rotor-far-red-fluorogenic-probe-for-ligand-receptor-interactions
#11
Iuliia A Karpenko, Yosuke Niko, Viktor P Yakubovskyi, Andriy O Gerasov, Dominique Bonnet, Yuriy P Kovtun, Andrey S Klymchenko
Fluorescent solvatochromic dyes and molecular rotors increase their popularity as fluorogenic probes for background-free detection of biomolecules in cellulo in no-wash conditions. Here, we introduce a push-pull boron-containing (dioxaborine) dye that presents unique spectroscopic behavior combining solvatochromism and molecular rotor properties. Indeed, in organic solvents, it shows strong red shifts in the absorption and fluorescence spectra upon increase in solvent polarity, typical for push-pull dyes. On the other hand, in polar solvents, where it probably undergoes Twisted Intramolecular Charge Transfer (TICT), the dye displays strong dependence of its quantum yield on solvent viscosity, in accordance to Förster-Hoffmann equation...
April 14, 2016: Journal of Materials Chemistry. C, Materials for Optical and Electronic Devices
https://www.readbyqxmd.com/read/27127631/ratiometric-mechanosensitive-fluorescent-dyes-design-and-applications
#12
Mark A Haidekker, Emmanuel A Theodorakis
Fluorescent molecules, with their almost instantaneous response to external influences and relatively low-cost measurement instrumentation, have been attractive analytical tools and biosensors for centuries. More recently, advanced chemical synthesis and targeted design have accelerated the development of fluorescent probes. This article focuses on dyes with segmental mobility (known as fluorescent molecular rotors) that act as mechanosensors, which are known for their relationship of emission quantum yield with microviscosity...
April 14, 2016: Journal of Materials Chemistry. C, Materials for Optical and Electronic Devices
https://www.readbyqxmd.com/read/27087967/using-membrane-composition-to-fine-tune-the-pk-a-of-an-optical-liposome-ph-sensor
#13
Kasey J Clear, Katelyn Virga, Lawrence Gray, Bradley D Smith
Liposomes containing membrane-anchored pH-sensitive optical probes are valuable sensors for monitoring pH in various biomedical samples. The dynamic range of the sensor is maximized when the probe pK a is close to the expected sample pH. While some biomedical samples are close to neutral pH there are several circumstances where the pH is 1 or 2 units lower. Thus, there is a need to fine-tune the probe pK a in a predictable way. This investigation examined two lipid-conjugated optical probes, each with appended deep-red cyanine dyes containing indoline nitrogen atoms that are protonated in acid...
April 14, 2016: Journal of Materials Chemistry. C, Materials for Optical and Electronic Devices
https://www.readbyqxmd.com/read/27042309/subcellular-behaviour-evaluation-of-nanopharmaceuticals-with-aggregation-induced-emission-molecules
#14
Xiangdong Xue, Jing Xu, Paul C Wang, Xing-Jie Liang
Nanopharmaceuticals possess a myriad of advantages for disease treatment, not only in delivering therapeutic agents, but also in deciphering their innate intracellular or subcellular behaviours, providing detailed diagnostic and prognostic information, quantifying treatment efficacy and designing better therapeutics. To evaluate the subcellular behaviour of nanopharmaceuticals, colourful fluorescence is the most potential technique, because it is capable of painting the subcellular detail in three dimensions with high resolution...
April 14, 2016: Journal of Materials Chemistry. C, Materials for Optical and Electronic Devices
https://www.readbyqxmd.com/read/27774151/the-impact-of-charge-transfer-and-structural-disorder-on-the-thermoelectric-properties-of-cobalt-intercalated-tis2
#15
Gabin Guélou, Paz Vaqueiro, Jesús Prado-Gonjal, Tristan Barbier, Sylvie Hébert, Emmanuel Guilmeau, Winfried Kockelmann, Anthony V Powell
A family of phases, Co x TiS2 (0 ≤ x ≤ 0.75) has been prepared and characterised by powder X-ray and neutron diffraction, electrical and thermal transport property measurements, thermal analysis and SQUID magnetometry. With increasing cobalt content, the structure evolves from a disordered arrangement of cobalt ions in octahedral sites located in the van der Waals' gap (x ≤ 0.2), through three different ordered vacancy phases, to a second disordered phase at x ≥ 0.67. Powder neutron diffraction reveals that both octahedral and tetrahedral inter-layer sites are occupied in Co0...
March 7, 2016: Journal of Materials Chemistry. C, Materials for Optical and Electronic Devices
https://www.readbyqxmd.com/read/28496979/crystal-structure-and-thermoelectric-properties-of-sr-mo-substituted-camno3-a-combined-experimental-and-computational-study
#16
D Srivastava, F Azough, R Freer, E Combe, R Funahashi, D M Kepaptsoglou, Q M Ramasse, M Molinari, S R Yeandel, J D Baran, S C Parker
A combination of experimental and computational techniques has been employed to study doping effects in perovskite CaMnO3. High quality Sr-Mo co-substituted CaMnO3 ceramics were prepared by the conventional mixed oxide route. Crystallographic data from X-ray and electron diffraction showed an orthorhombic to tetragonal symmetry change on increasing the Sr content, suggesting that Sr widens the transition temperature in CaMnO3 preventing phase transformation-cracking on cooling after sintering, enabling the fabrication of high density ceramics...
December 21, 2015: Journal of Materials Chemistry. C, Materials for Optical and Electronic Devices
https://www.readbyqxmd.com/read/27019715/acido-basic-control-of-the-thermoelectric-properties-of-poly-3-4-ethylenedioxythiophene-tosylate-pedot-tos-thin-films
#17
Zia Ullah Khan, Olga Bubnova, Mohammad Javad Jafari, Robert Brooke, Xianjie Liu, Roger Gabrielsson, Thomas Ederth, Drew R Evans, Jens W Andreasen, Mats Fahlman, Xavier Crispin
PEDOT-Tos is one of the conducting polymers that displays the most promising thermoelectric properties. Until now, it has been utterly difficult to control all the synthesis parameters and the morphology governing the thermoelectric properties. To improve our understanding of this material, we study the variation in the thermoelectric properties by a simple acido-basic treatment. The emphasis of this study is to elucidate the chemical changes induced by acid (HCl) or base (NaOH) treatment in PEDOT-Tos thin films using various spectroscopic and structural techniques...
October 28, 2015: Journal of Materials Chemistry. C, Materials for Optical and Electronic Devices
https://www.readbyqxmd.com/read/27358736/unravelling-the-chemical-design-of-spin-crossover-nanoparticles-based-on-iron-ii-triazole-coordination-polymers-towards-a-control-of-the-spin-transition
#18
Mónica Giménez-Marqués, M Luisa García-Sanz de Larrea, Eugenio Coronado
A systematic study of the key synthetic parameters that control the growth of spin-crossover (SCO) nanoparticles (NPs) using the reverse micelle technique has been undertaken in the system [Fe(Htrz)2(trz)](BF4)·H2O, (Htrz = 1,2,4-triazole). This has permitted us to modulate the physical properties of the NPs in a controlled and reproducible manner. In particular, a control over the size of the NPs (in the range 4 to 16 nm) has been achieved by varying the water to surfactant molar ratio. The consequences of this size variation on the cooperativity of the spin transition are discussed...
August 14, 2015: Journal of Materials Chemistry. C, Materials for Optical and Electronic Devices
https://www.readbyqxmd.com/read/26491540/poly-3-4-ethylenedioxythiophene-ionic-liquid-coating-improves-neural-recording-and-stimulation-functionality-of-meas
#19
Zhanhong Jeff Du, Xiliang Luo, Cassandra Weaver, Xinyan Tracy Cui
In vivo multi-electrode arrays (MEAs) can sense electrical signals from a small set of neurons or modulate neural activity through micro-stimulation. Electrode's geometric surface area (GSA) and impedance are important for both unit recording and neural stimulation. Smaller GSA is preferred due to enhanced selectivity of neural signal, but it tends to increase electrode impedance. Higher impedance leads to increased electrical noise and signal loss in single unit neural recording. It also yields a smaller charge injection window for safe neural stimulation...
July 7, 2015: Journal of Materials Chemistry. C, Materials for Optical and Electronic Devices
https://www.readbyqxmd.com/read/26113977/one-step-femtosecond-laser-patterning-of-light-trapping-structure-on-dye-sensitized-solar-cell-photoelectrodes%C3%A2
#20
Xi Zhang, Hewei Liu, Xuezhen Huang, Hongrui Jiang
Light-trapping patterns were constructed in TiO2 photoelectrodes for dye-sensitized solar cells (DSSCs) by a one-step femtosecond laser structuring method that utilized ablation to create patterns at the surface of nanostructured TiO2 films. As a result, much more light was trapped in the photoelectrodes. Grating and orthogonal-grid patterns were studied, and the light trapping performance was optimized through the adjustment of pattern spacing, which was easily realized in the laser ablation process. With a 5-μm-spacing orthogonal-grid pattern, DSSCs showed a highest photon-to-electron conversion efficiency of 9...
April 14, 2015: Journal of Materials Chemistry. C, Materials for Optical and Electronic Devices
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