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ACS Applied Materials & Interfaces

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https://www.readbyqxmd.com/read/28340299/bifurcation-of-regeneration-and-recombination-in-dye-sensitized-solar-cells-via-electronic-manipulation-of-tandem-cobalt-redox-shuttles
#1
Josh Baillargeon, Yuling Xie, Thomas W Hamann
A cobalt(IV/III) redox shuttle, cobalt tris(2-(p-tolyl)pyridine), [Co(ptpy)3]+/0, was synthesized and investigated for use in dye-sensitized solar cells, DSSCs. An incredibly fast self-exchange rate constant of (9.2  3.9) × 108 M-1s-1 was determined for [Co(ptpy)3]+/0, making it an ideal candidate for dye regeneration. To avoid fast recombination and solubility limitations, a tandem electrolyte containing [Co(ptpy)3]+/0 and cobalt tris(2,2'-bipyridine), [Co(bpy)3]3+/2+, was utilized. An improved short circuit current density is achieved for DSSCs employing the tandem electrolyte, compared to electrolytes containing only [Co(bpy)3]3+/2+, consistent with superior dye regeneration expected based on predictions using Marcus Theory, which is also discussed...
March 24, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28340293/functional-paper-based-platform-for-rapid-capture-and-detection-of-ceo2-nanoparticles
#2
Ali Othman, Daniel Andreescu, Dinusha P Karunaratne, Suryadevara V Babu, Silvana Andreescu
Development of systems for capture, sequestration and tracking of nanoparticles (NPs) is becoming a significant focus in many aspects of nanotechnology and environmental research. These systems enable a broad range of applications for evaluating concentration, distribution and effects of NPs for environmental, clinical, epidemiological and occupational exposure studies. Herein, we describe the first example of a ligand-graft multifunctional platform for capture and detection of cerium oxide (CeO2 or ceria) NPs...
March 24, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28339185/red-emission-b-n-s-co-doped-carbon-dots-for-colorimetric-and-fluorescent-dual-mode-detection-of-fe3-ions-in-complex-biological-fluids-and-living-cells
#3
Yinghua Liu, Wenxiu Duan, Wei Song, Juanjuan Liu, Cuiling Ren, Jiang Wu, Dan Liu, Hongli Chen
Colorimetric and fluorescent dual mode detection methods have gained much attention in recent years, however, it is still desirable to develop new colorimetric and fluorescent dual mode nanosensors with more simple preparation procedure, low cost and excellent biocompatibility. Herein, a colorimetric and fluorescent nanosensor based on B, N, S-co-doped carbon dots (BNS-CDs) were synthesized by one-step hydrothermal treatment of 2, 5-diaminobenzenesulfonic acid and 4-aminophenylboronic acid hydrochloride. Using this nanosensor, a highly sensitive assay of Fe3+ in the range of 0...
March 24, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28339183/tunable-porosity-of-crosslinked-polyhedral-oligomeric-silsesquioxane-poss-supports-for-palladium-catalyzed-aerobic-alcohol-oxidation-in-water
#4
Preeyanuch Sangtrirutnugul, Thanawat Chaiprasert, Warodom Hunsiri, Thanudkit Jitjaroendee, Patsaya Songkhum, Kritapas Laohhasurayotin, Tanakorn Osotchan, Vuthichai Ervithayasuporn
Polyhedral oligomeric silsesquioxane (POSS)-based materials, poly-POSS-Tn [n = 8 (1), 10 (2), 12 (3), and mix (4)], were prepared in high yields via free radical polymerization of corresponding pure forms of methacrylate-functionalized POSS monomers, MMA-POSS-Tn (n = 8, 10, 12), and the mixture form, MMA-POSS-Tmix. Powder X-ray diffraction (XRD) spectra and BET analysis indicate that 1-4 are amorphous materials with high surface areas (683-839 m2•g-1). The surface areas and total pore volumes follow the trend: poly-POSS-T12 > poly-POSS-T10 > poly-POSS-Tmix > poly-POSS-T8...
March 24, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28339181/oxidative-polyoxometalates-modified-graphitic-carbon-nitride-for-visible-light-co2-reduction
#5
Jie Zhou, Weichao Chen, Chunyi Sun, Lu Han, Chao Qin, Mengmeng Chen, Xinlong Wang, Enbo Wang, Zhongmin Su
Developing a photocatalysis system for converting CO2 to valuable fuels or chemicals is a promising strategy to address global warming and fossil fuel consumption. Exploring photocatalysts with high-performance and low-cost has been two ultimate goals toward photoreduction of CO2. Herein, noble-metal-free polyoxometalates (Co4) with oxidative ability was first introduced into g-C3N4 resulted in inexpensive hybrid materials (Co4@g-C3N4) with staggered band alignment. The staggered composited materials show a higher activity of CO2 reduction than bare g-C3N4...
March 24, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28339180/a-study-of-oxygen-evolution-reaction-catalytic-behavior-of-coxni1-xfe2o4-in-alkaline-medium
#6
Viruthasalam Maruthapandian, Mahendran Mathankumar, Velu Saraswathy, Balasubramanian Subramanian, Srinivasan Muralidharan
Catalysts for the oxygen evolution reaction (OER) play an important role in the conversion of solar energy to fuel of earth abundant water into H2 and O2 through splitting/electrolyzer. The heterogeneous electrocatalysts for hydrogen and oxygen evolution reactions (HER and OER) exhibit catalytic activity that depends on the electronic properties, oxidation states and local surface structure. Spinel ferrites (MFe2O4; M = Ni and Co) based materials have been attractive for the catalytic water oxidation due to their well-known stability in alkaline medium, easy synthesis, existence of metal cations with various oxidation states, low cost and tunable properties by the desired metal substitution...
March 24, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28339179/synthesis-of-111-facet-exposed-mgo-with-surface-oxygen-vacancies-for-ros-generation-in-the-dark
#7
Ying-Juan Hao, Bing Liu, Li-Gang Tian, Fa-Tang Li, Jie Ren, Shao-Jia Liu, Ying Liu, Jun Zhao, Xiaojing Wang
Seeking a simple and moderate route to generate reactive oxygen species (ROS) for antibiosis is of great interest and challenge. This work demonstrates that molecule transition and electron rearrangement processes can directly occur only through chemisorption interaction between the adsorbed O2 and high-energy {111} facet-exposed MgO with abundant surface oxygen vacancies (SOVs), hence producing singlet oxygen and superoxide anion radicals without light irradiation. These ROS were confirmed by electron paramagnetic resonance, in-situ Raman and scavenger experiments, respectively...
March 24, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28338325/enhanced-electrochemical-performances-of-bi2o3-rgo-nanocomposite-via-chemical-bonding-as-anode-materials-for-lithium-ion-batteries
#8
Zhuo Deng, Tingting Liu, Tao Chen, Jiaxiang Jiang, Wanli Yang, Jun Guo, Jianqing Zhao, Haibo Wang, Lijun Gao
Bismuth oxide/reduced graphene oxide (marked as Bi2O3@rGO) nanocomposite has been facilely prepared by a solvothermal method via introducing chemical bonding that has been demonstrated by Raman and XPS spectra. Tremendous single-crystal Bi2O3 nanoparticles with an average size of ~5 nm are anchored and uniformly dispersed on rGO sheets. Such a nanostructure results in enhanced electrochemical reversibility and cycling stability of Bi2O3@rGO composite materials as anode for lithium ion batteries in comparison with agglomerated bare Bi2O3 nanoparticles...
March 24, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28338323/shape-dependent-radiosensitization-effect-of-gold-nanostructures-in-cancer-radiotherapy-comparison-of-gold-nanoparticles-nanospikes-and-nanorods
#9
Ningning Ma, Fu-Gen Wu, Xiaodong Zhang, Yao-Wen Jiang, Hao-Ran Jia, Hong-Yin Wang, Yan-Hong Li, Peidang Liu, Ning Gu, Zhan Chen
The shape effect of gold (Au) nanomaterials on the efficiency of cancer radiotherapy has not been fully elucidated. To address this issue, Au nanomaterials with different shapes but similar average size (~50 nm) including gold nanoparticles (GNPs), gold nanospikes (GNSs), and gold nanorods (GNRs) were synthesized and functionalized with poly(ethylene glycol) (PEG) molecules. Although all these Au nanostructures were coated with the same PEG molecules, their cellular uptake behavior differed significantly. The GNPs showed the highest cellular responses compared to the GNSs and the GNRs (based on the same gold mass) after incubation with KB cancer cells for 24 h...
March 24, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28338321/thiol-reactive-star-polymers-display-enhanced-association-with-distinct-human-blood-components
#10
Joshua Julian Glass, Yang Li, Robert De Rose, Angus P R Johnston, Ewa I Czuba, Song Yang Khor, John F Quinn, Michael R Whittaker, Thomas P Davis, Stephen J Kent
Directing nanoparticles to specific cell types using non-antibody based methods is of increasing interest. Thiol-reactive nanoparticles can enhance the efficiency of cargo delivery into specific cells through interactions with cell surface proteins. However, studies to date using this technique have been largely limited to immortalized cell lines or rodents and the utility of this technology on primary human cells is unknown. Herein, we used RAFT polymerization to prepare pyridyl disulphide (PDS)-functionalized star polymers with a methoxy-poly(ethylene glycol) brush corona and a fluorescently-labelled crosslinked core using an arm-first method...
March 24, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28338316/quantitative-characterization-of-the-surface-evolution-for-lini0-5co0-2mn0-3o2-graphite-cell-during-long-term-cycling
#11
Huiyuan Zheng, Qunting Qu, Guobin Zhu, Gao Liu, Vincent S Battaglia, Honghe Zheng
Many factors have been proposed explaining the capacity degradation mechanisms of LiNixCoyMnzO2 (NCM)/graphite cells at extreme conditions such as under high temperature or with high charge voltage limit. However, the main factors dominating the long-term cycling performance under normal operations remain elusive. Quantitative analyses of the electrode surface evolution for a commercial 18650 LiNi0.5Co0.2Mn0.3O2 (NCM523)/graphite cell during ca. 3000 cycles under normal operation are presented. Electrochemical analyses and inductively coupled plasma-optical emission spectroscopy (ICP-OES) confirm lithium inventory loss accounts for ca...
March 24, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28338314/surface-layer-evolution-on-graphite-during-electrochemical-sodium-tetraglyme-co-intercalation
#12
Julia Maibach, Fabian Jeschull, Daniel Brandell, Kristina Edstrom, Mario Valvo
One obstacle in sodium ion batteries is the lack of suitable anode materials. As recently shown, the most common anode material of the state of the art lithium ion batteries, graphite, can be used for sodium ion storage as well, if ether-based electrolyte solvents are used. These solvents co-intercalate with the sodium ions leading to the highly reversible formation of ternary graphite intercalation compounds (t-GIC). In order for the solvent co-intercalation to work efficiently, it is expected that only a very thin surface layer forms during electrochemical cycling...
March 24, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28338313/ultimate-control-of-rate-dependent-adhesion-for-reversible-transfer-process-via-thin-elastomeric-layer
#13
Chan Kim, Min-Ah Yoon, Bongkyun Jang, Jae-Hyun Kim, Hak-Joo Lee, Kwang-Seop Kim
Adhesion between a stamp with an elastomeric layer and various devices or substrates is crucial to successfully fabricate flexible electronics using a transfer process. Although various transfer processes using stamps with different adhesion strengths have been suggested, the controllable range of adhesion is still limited to a narrow range. To precisely transfer devices onto selected substrates, however, the difference in adhesion between the picking and placing processes should be large enough to achieve a high yield...
March 24, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28338312/engineering-nanoscale-iron-oxides-for-uranyl-sorption-and-separation-optimization-of-particle-core-size-and-bilayer-surface-coatings
#14
Wenlu Li, Lyndsay D Troyer, Seung Soo Lee, Jiewei Wu, Changwoo Kim, Brandon J Lafferty, Jeffrey G Catalano, John D Fortner
Herein, we describe engineered superparamagnetic iron oxide nanoparticles (IONPs) as platform materials for enhanced uranyl (UO22+) sorption and separation processes under environmentally relevant conditions. Specifically, monodispersed 8-25 nm iron oxide (magnetite, Fe3O4) nanoparticles with tailored organic acid bilayered coatings have been systematically evaluated and optimized to bind, and thus remove, uranium, from water. The combined non-hydrolytic synthesis and bilayer phase transfer material preparation methods yield highly uniform and surface tailorable IONPs, which allow us to directly evaluate the size-dependent and coating-dependent sorption capacities of IONPs...
March 24, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28337913/selective-conversion-from-p-type-to-n-type-of-printed-bottom-gate-carbon-nanotube-thin-film-transistors-and-application-in-cmos-inverters
#15
Qiqi Xu, Jianwen Zhao, Vincenzo Pecunia, Wenya Xu, Chunshan Zhou, Junyan Dou, Weibing Gu, Jian Lin, Lixin Mo, Yanfei Zhao, Zheng Cui
The fabrication of printed high-performance and environmentally stable n-type single-walled carbon nanotube (SWCNT) transistors and their integration into complementary (i.e. CMOS) circuits are widely recognized as key to achieving the full potential of carbon nanotube electronics. Here, we report a simple, efficient, and robust method to convert the polarity of SWCNT thin-film transistors (TFTs) using cheap and readily available ethanolamine as electron doping agent. Printed p-type bottom-gate SWCNT TFTs can be selectively converted into n-type by deposition of ethanolamine inks on the transistor active region via aerosol jet printing...
March 24, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28337912/nanostructured-nickel-cobalt-titanium-alloy-grown-on-titanium-substrate-as-efficient-electrocatalysts-for-alkaline-water-electrolysis
#16
Pandian Ganesan, Sivanantham Arumugam, Sangaraju Shanmugam
One of the important challenges in alkaline water electrolysis are to utilize a bifunctional catalyst for both hydrogen evolution (HER) and oxygen evolution (OER) reactions to increase the efficiency of water splitting devices for the long durable operations. Herein, nickel-cobalt-titanium alloy directly grown on a high corrosion resistance titanium foil (NCT) by a simple, single and rapid electrochemical deposition at room temperature. The electrocatalytic activity of NCT alloy electrodes is evaluated for both HER and OER in aqueous electrolyte...
March 24, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28337909/engineering-of-ferroelectric-hfo2-zro2-nanolaminates
#17
Stephen Larsen Weeks, Ashish Pal, Vijay K Narasimhan, Karl A Littau, Tony Chiang
In this work, the ferroelectric properties of nanolaminates made of HfO2 and ZrO2 were studied as a function of deposition temperature and individual HfO2/ZrO2 layer thickness before and after electrical field cycling. The ferroelectric response was found to depend on the microstructure of the nanolaminates before any post deposition annealing treatment. After annealing with a TiN cap, an "antiferroelectric-like" response was obtained from nanolaminates deposited in an amorphous state at a lower temperature, while a ferroelectric response was obtained from nanolaminates deposited at a higher temperature where crystallites were detected in thick films before annealing...
March 24, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28337907/a-single-cell-based-platform-for-copy-number-variation-profiling-through-digital-counting-of-amplified-genomic-dna-fragments
#18
Chunmei Li, Zhilong Yu, Yusi Fu, Yuhong Pang, Yanyi Huang
We develop a novel single-cell-based platform through digital counting of amplified genomic DNA fragments, named multi-fraction amplification (mfA), to detect the copy number variations (CNVs) in a single cell. Amplification is required to acquire genomic information from a single cell, while introducing unavoidable bias. Unlike prevalent methods that directly infers CNV profiles from the pattern of sequencing depth, our mfA platform denatures and separates the DNA molecules from a single cell into multiple fractions of reaction mix before amplification...
March 24, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28337905/simultaneous-detection-of-dihydroxybenzene-isomers-with-zno-nanorod-carbon-cloth-electrodes
#19
Shangjun Meng, Ying Hong, Ziyang Dai, Wei Huang, Xiao-Chen Dong
Herein, ZnO nanorods with average diameters of 50 nm were uniformly anchored on the surface of carbon cloth directly by a simply hydrothermal method. The nanorods growing in situ along the specific direction of (002) have single crystalline features and a columnar structure. Based on the ZnO nanorod/carbon cloth composite, free-standing electrodes were fabricated for the simultaneous determination of dihydroxybenzene isomers. The ZnO nanorod/carbon cloth electrodes exhibited excellent electrochemical stability, high sensitivity and selectivity...
March 24, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28337904/shallow-acceptor-state-in-mg-doped-cualo2-and-its-effect-on-electrical-and-optical-properties-an-experimental-and-first-principles-study
#20
Ruijian Liu, Yongfeng Li, Bin Yao, Zhanhui Ding, Yuhong Jiang, Lei Meng, Rui Deng, Ligong Zhang, Zhenzhong Zhang, Haifeng Zhao, Lei Liu
Shallow acceptor states in Mg-doped CuAlO2 and their effect on structural, electrical and optical properties are investigated by combining first-principles calculations and experiments. First-principles calculations demonstrate that Mg substituting Al site in CuAlO2 plays a role of shallow acceptor and has a low formation energy, suggesting that Mg doping can increase hole concentration and improve conductivity of CuAlO2. Hall effect measurements indicates that the hole concentration of Mg-doped CuAlO2 thin film is two orders of magnitude higher than that of undoped CuAlO2...
March 24, 2017: ACS Applied Materials & Interfaces
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