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

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https://www.readbyqxmd.com/read/27933162/photoexcited-state-properties-of-carbon-dots-from-thermally-induced-functionalization-of-carbon-nanoparticles
#1
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/27774150/a-single-source-precursor-approach-to-solution-processed-indium-arsenide-thin-films
#2
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/27358738/a-novel-design-strategy-for-nanoparticles-on-nanopatterns-interferometric-lithographic-patterning-of-mms6-biotemplated-magnetic-nanoparticles
#3
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
#4
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
#5
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/27127631/ratiometric-mechanosensitive-fluorescent-dyes-design-and-applications
#6
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
#7
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
#8
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
#9
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/27019715/acido-basic-control-of-the-thermoelectric-properties-of-poly-3-4-ethylenedioxythiophene-tosylate-pedot-tos-thin-films
#10
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
#11
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
#12
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
#13
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
https://www.readbyqxmd.com/read/27358735/harnessing-nonlinear-rubber-swelling-for-bulk-synthesis-of-anisotropic-hybrid-nanoparticles
#14
Tao Ding, Stoyan K Smoukov, Jeremy J Baumberg
Asymmetric hybrid nanoparticles are at the forefront of colloidal chemistry as building blocks for novel structures and applications, as well as for exploring fundamental ways of breaking symmetry in physical systems. Current methods of synthesis have significant limitations in terms of control over synthesis, particle size ranges and polydispersity. We report a facile and scalable synthesis based on the anisotropic swelling of rubber to obtain metal-(polymer rubber) hybrid nanoparticles. Initial Au nanoparticle (NP) seeds are grown larger by reducing HAuCl4 with divinyl benzene (DVB), while simultaneous radical polymerization of DVB forms a cross-linked rubber layer of PDVB on the Au NP surface...
November 7, 2014: Journal of Materials Chemistry. C, Materials for Optical and Electronic Devices
https://www.readbyqxmd.com/read/25383191/electrochemically-created-highly-surface-roughened-ag-nanoplate-arrays-for-sers-biosensing-applications
#15
Shikuan Yang, Daniel Slotcavage, John D Mai, Feng Guo, Sixing Li, Yanhui Zhao, Yong Lei, Craig E Cameron, Tony Jun Huang
Highly surface-roughened Ag nanoplate arrays are fabricated using a simple electrodeposition and in situ electrocorrosion method with inorganic borate ions as capping agent. The electrocorrosion process is induced by a change in the local pH value during the electrochemical growth, which is used to intentionally carve the electrodeposited structures. The three dimensionally arranged Ag nanoplates are integrated with substantial surface-enhanced Raman scattering (SERS) hot spots and are free of organic contaminations widely used as shaping agents in previous works, making them excellent candidate substrates for SERS biosensing applications...
October 21, 2014: Journal of Materials Chemistry. C, Materials for Optical and Electronic Devices
https://www.readbyqxmd.com/read/25580250/ionothermal-synthesis-of-open-framework-metal-phosphates-with-a-kagom%C3%A3-lattice-network-exhibiting-canted-anti-ferromagnetism%C3%A2-electronic-supplementary-information-esi-available-cif-files-atomic-parameters-x-ray-diffraction-patterns-ir-spectra-tg-curves-and
#16
Guangmei Wang, Martin Valldor, Bert Mallick, Anja-Verena Mudring
Four open-framework transition-metal phosphates; (NH4)2Co3(HPO4)2F4 (1), (NH4)Co3(HPO4)2(H2PO4)F2 (2), KCo3(HPO4)2(H2PO4)F2 (3), and KFe3(HPO4)2(H2PO4)F2 (4); are prepared by ionothermal synthesis using pyridinium hexafluorophosphate as the ionic liquid. Single-crystal X-ray diffraction analyses reveal that the four compounds contain cobalt/iron-oxygen/fluoride layers with Kagomé topology composed of interlinked face-sharing MO3F3/MO4F2 octahedra. PO3OH pseudo-tetrahedral groups augment the [M3O6F4] (1)/[M3O8F2] layers on both sides to give M3(HPO4)2F4 (1) and M3(HPO4)2F2 (2-4) layers...
September 21, 2014: Journal of Materials Chemistry. C, Materials for Optical and Electronic Devices
https://www.readbyqxmd.com/read/25580249/photoactive-rolled-up-tio2-microtubes-fabrication-characterization-and-applications%C3%A2-electronic-supplementary-information-esi-available-see-doi-10-1039-c4tc00796dclick-here-for-additional-data-file
#17
Silvia Giudicatti, Sonja M Marz, Lluís Soler, Abbas Madani, Matthew R Jorgensen, Samuel Sanchez, Oliver G Schmidt
Because of its unique properties, titania (TiO2) represents a promising candidate in a wide variety of research fields. In this paper, some of the properties and potential applications of titania within rolled-up nanotechnology are explored. It is shown how the structural and optical properties of rolled titania microtubes can be controlled by properly tuning the microfabrication parameters. The rolling up of titania films on different sacrificial layers and containing different shapes, achieving a control on the diameter of the fabricated titania microtubes, is presented...
August 7, 2014: Journal of Materials Chemistry. C, Materials for Optical and Electronic Devices
https://www.readbyqxmd.com/read/24748991/superhydrophobic-surface-enhanced-raman-scattering-sensing-using-janus-particle-arrays-realized-by-site-specific-electrochemical-growth
#18
Shikuan Yang, Patrick John Hricko, Po-Hsun Huang, Sixing Li, Yanhui Zhao, Yuliang Xie, Feng Guo, Lin Wang, Tony Jun Huang
Site-specific electrochemical deposition is used to prepare polystyrene (PS)-Ag Janus particle arrays with superhydrophobic properties. The analyte molecules can be significantly enriched using the superhydrophobic property of the PS-Ag Janus particle array before SERS detections, enabling an extremely sensitive detection of molecules in a highly diluted solution (e.g., femtomolar level). This superhydrophobic surface enhanced Raman scattering sensing concept described here is of critical significance in biosensing and bioanalysis...
January 21, 2014: Journal of Materials Chemistry. C, Materials for Optical and Electronic Devices
https://www.readbyqxmd.com/read/24187611/silver-nanocube-on-gold-microplate-as-a-well-defined-and-highly-active-substrate-for-sers-detection
#19
Xiaohu Xia, Matthew Rycenga, Dong Qin, Younan Xia
Strong enhancement and good reproducibility in Raman signals are two major requirements for a surface-enhanced Raman scattering (SERS) substrate to be used for sensitive detection of an analyte. Here we report a new type of SERS substrate that was fabricated by depositing a Ag nanocube (AgNC) on the surface of a Au microplate (AuMP). Owing to the strong and reproducible hot spots formed at corner sites of the AgNC in proximity with the AuMP surface, the new substrate showed high sensitivity and reproducibility...
October 14, 2013: Journal of Materials Chemistry. C, Materials for Optical and Electronic Devices
https://www.readbyqxmd.com/read/24078864/fluorescent-materials-for-ph-sensing-and-imaging-based-on-novel-1-4-diketopyrrolo-3-4-c-pyrrole-dyes%C3%A2-electronic-supplementary-information-esi-available-nmr-and-ms-spectra-further-sensor-characteristics-and-sensor-long-time-performance-see-doi-10-1039-c3tc31130aclick
#20
Daniel Aigner, Birgit Ungerböck, Torsten Mayr, Robert Saf, Ingo Klimant, Sergey M Borisov
New optical pH-sensors relying on 1,4-diketopyrrolo-[3,4-c]pyrroles (DPPs) as fluorescent pH-indicators are presented. Different polymer hydrogels are useful as immobilization matrices, achieving excellent sensitivity and good brightness in the resulting sensor. The operational pH can be tuned over a wide range (pH 5-12) by selecting the fine structure of the indicator and the matrix. A ratiometric sensor in the form of nanoparticles is also presented. It is suitable for RGB camera readout, and its practical applicability for fluorescence imaging in microfluidic systems is demonstrated...
September 28, 2013: Journal of Materials Chemistry. C, Materials for Optical and Electronic Devices
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