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Nanomaterials

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https://www.readbyqxmd.com/read/30022003/visible-light-driven-photoanodes-for-water-oxidation-based-on-novel-r-go-%C3%AE-cu%C3%A2-v%C3%A2-o%C3%A2-tio%C3%A2-nanorods-composites
#1
Leonardo Girardi, Shuang Shuang, Gian Andrea Rizzi, Andrea Sartorel, Carla Marega, Zhengjun Zhang, Gaetano Granozzi
This paper describes the preparation and the photoelectrochemical performances of visible light driven photoanodes based on novel r-GO/β-Cu₂V₂O₇/TiO₂ nanorods/composites. β-Cu₂V₂O₇ was deposited on both fluorine doped tin oxide (FTO) and TiO₂ nanorods (NRs)/FTO by a fast and convenient Aerosol Assisted Spray Pyrolysis (AASP) procedure. Ethylenediamine (EN), ammonia and citric acid (CA) were tested as ligands for Cu2+ ions in the aerosol precursors solution. The best-performing deposits, in terms of photocurrent density, were obtained when NH₃ was used as ligand...
July 18, 2018: Nanomaterials
https://www.readbyqxmd.com/read/30021982/investigation-of-forward-tunneling-characteristics-of-ingan-gan-blue-light-emitting-diodes-on-freestanding-gan-detached-from-a-si-substrate
#2
Moonsang Lee, Hyunkyu Lee, Keun Man Song, Jaekyun Kim
We report forward tunneling characteristics of InGaN/GaN blue light emitting diodes (LEDs) on freestanding GaN detached from a Si substrate using temperature-dependent current⁻voltage ( T-I-V ) measurements. T-I-V analysis revealed that the conduction mechanism of InGaN/GaN LEDs using the homoepitaxial substrate can be distinguished by tunneling, diffusion and recombination current, and series resistance regimes. Their improved crystal quality, inherited from the nature of homoepitaxy, resulted in suppression of forward leakage current...
July 18, 2018: Nanomaterials
https://www.readbyqxmd.com/read/30021972/platinum-nanoparticle-inclusion-into-a-carbonized-polymer-of-intrinsic-microporosity-electrochemical-characteristics-of-a-catalyst-for-electroless-hydrogen-peroxide-production
#3
Robert K Adamik, Naiara Hernández-Ibáñez, Jesus Iniesta, Jennifer K Edwards, Alexander G R Howe, Robert D Armstrong, Stuart H Taylor, Alberto Roldan, Yuanyang Rong, Richard Malpass-Evans, Mariolino Carta, Neil B McKeown, Daping He, Frank Marken
The one-step vacuum carbonization synthesis of a platinum nano-catalyst embedded in a microporous heterocarbon (Pt@cPIM) is demonstrated. A nitrogen-rich polymer of an intrinsic microporosity (PIM) precursor is impregnated with PtCl₆2- to give (after vacuum carbonization at 700 °C) a nitrogen-containing heterocarbon with embedded Pt nanoparticles of typically 1⁻4 nm diameter (with some particles up to 20 nm diameter). The Brunauer-Emmett-Teller (BET) surface area of this hybrid material is 518 m² g-1 (with a cumulative pore volume of 1...
July 18, 2018: Nanomaterials
https://www.readbyqxmd.com/read/30021963/stretchable-supercapacitors-based-on-carbon-nanotubes-deposited-rubber-polymer-nanofibers-electrodes-with-high-tolerance-against-strain
#4
Juyeon Yoon, Joonhyung Lee, Jaehyun Hur
We report a new fabrication method for a fully stretchable supercapacitor based on single wall carbon nanotube (SWCNT)-coated electrospun rubber nanofibers as stretchable supercapacitor electrodes. The deposition conditions of SWCNT on hydrophobic rubber nanofibers are experimentally optimized to induce a uniform coating of SWCNT. For surfactant-assisted coating of SWCNT, both water contact angle and sheet resistance were lower compared to the cases with other surface treatment methods, indicating a more effective coating approach...
July 18, 2018: Nanomaterials
https://www.readbyqxmd.com/read/30021948/effects-of-cold-rolling-and-annealing-prior-to-dealloying-on-the-microstructure-of-nanoporous-gold
#5
Hanyu Hui, Re Xia, Juying Li, Qingsong Mei, Ye Ma, Feng Chen, Yan Lei
The properties of nanoporous gold (NPG) were known to be dependent on the microstructure of NPG. In this study, the effects of cold rolling and annealing of the original Ag0.7 Au0.3 alloy on the microstructure of NPG produced by dealloying under free corrosion condition were investigated. Ag0.7 Au0.3 alloy samples were cold-rolled to different strain levels/thickness reductions up to 98% and annealed at 900 °C for 3 h before dealloying. It was found that cold rolling and annealing of the original alloy can lead to reduced ligament and pore sizes of NPG...
July 18, 2018: Nanomaterials
https://www.readbyqxmd.com/read/30021935/in-vitro-cytotoxicity-and-morphological-assessments-of-go-zno-against-the-mcf-7-cells-determination-of-singlet-oxygen-by-chemical-trapping
#6
Fozia Shaheen, Muhammad Hammad Aziz, Mahvish Fatima, Muhammad Ajmal Khan, Faisal Ahmed, Riaz Ahmad, Muhammad Ashfaq Ahmad, Turki S Alkhuraiji, Muhammad Waseem Akram, Rizwan Raza, Syed Mansoor Ali
Graphene-based materials have attracted considerable interest owing to their distinctive characteristics, such as their biocompatibility in terms of both their physical and intrinsic chemical properties. The use of nanomaterials with graphene as a biocompatible agent has increased due to an uptick in dedication from biomedical investigators. Here, GO-ZnO was characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), ultraviolet-visible (UV-Vis) spectroscopy, energy dispersive X-ray analysis (EDAX), and Raman spectroscopy for structural, morphological, and elemental analysis...
July 18, 2018: Nanomaterials
https://www.readbyqxmd.com/read/30018255/realization-of-lasing-emission-from-one-step-fabricated-wse%C3%A2-quantum-dots
#7
Pengpeng Ren, Wenfei Zhang, Yiqun Ni, Di Xiao, Honghao Wan, Ya-Pei Peng, Ling Li, Peiguang Yan, Shuangchen Ruan
Two-dimensional (2D) transition-metal dichalcogenides (TMDCs) quantum dots (QDs) are the vanguard due to their unique properties. In this work, WSe₂ QDs were fabricated via one step ultrasonic probe sonication. Excitation wavelength dependent photoluminescence (PL) is observed from WSe₂ QDs. Room-temperature lasing emission which benefits from 3.7 times enhancement of PL intensity by thermal treatment at ~470 nm was achieved with an excitation threshold value of ~3.5 kW/cm² in a Fabry⁻Perot laser cavity...
July 17, 2018: Nanomaterials
https://www.readbyqxmd.com/read/30018225/highly-efficient-and-reusable-montmorillonite-fe%C3%A2-o%C3%A2-humic-acid-nanocomposites-for-simultaneous-removal-of-cr-vi-and-aniline
#8
Haijiao Lu, Jingkang Wang, Fei Li, Xin Huang, Beiqian Tian, Hongxun Hao
Recyclable nanomaterials are in great need to develop clean technology for applications in the removal of water contaminants. In this work, easily separable montmorillonite/Fe₃O₄/humic acid (MFH) nanocomposites were fabricated through a facile hydrothermal route. It was found the adsorption ability and stability of MFH was significantly enhanced due to the synergistic effects between montmorillonite, Fe₃O₄ nanoparticles and humic acid. The MFH nanocomposites are highly efficient and recyclable as they can remove at least 82...
July 17, 2018: Nanomaterials
https://www.readbyqxmd.com/read/30012971/subwavelength-nanostructuring-of-gold-films-by-apertureless-scanning-probe-lithography-assisted-by-a-femtosecond-fiber-laser-oscillator
#9
Ignacio Falcón Casas, Wolfgang Kautek
Optical methods in nanolithography have been traditionally limited by Abbe's diffraction limit. One method able to overcome this barrier is apertureless scanning probe lithography assisted by laser. This technique has demonstrated surface nanostructuring below the diffraction limit. In this study, we demonstrate how a femtosecond Yb-doped fiber laser oscillator running at high repetition rate of 46 MHz and a pulse duration of 150 fs can serve as the laser source for near-field nanolithography. Subwavelength features were generated on the surface of gold films down to a linewidth of 10 nm...
July 16, 2018: Nanomaterials
https://www.readbyqxmd.com/read/30012968/nanostructure-formation-on-diamond-like-carbon-films-induced-with-few-cycle-laser-pulses-at-low-fluence-from-a-ti-sapphire-laser-oscillator
#10
Seiya Nikaido, Takumi Natori, Ryo Saito, Godai Miyaji
This study reports the results of experiments on periodic nanostructure formation on diamond-like carbon (DLC) films induced with 800 nm, 7-femtosecond (fs) laser pulses at low fluence from a Ti:sapphire laser oscillator. It was demonstrated that 7-fs laser pulses with a high power density of 0.8⁻2 TW/cm² at a low fluence of 5⁻12 mJ/cm² can form a periodic nanostructure with a period of 60⁻80 nm on DLC films. The period decreases with increasing fluence of the laser pulses. The experimental results and calculations for a model target show that 7-fs pulses can produce a thinner metal-like layer on the DLC film through a nonlinear optical absorption process compared with that produced with 100-fs pulses, creating a finer nanostructure via plasmonic near-field ablation...
July 16, 2018: Nanomaterials
https://www.readbyqxmd.com/read/30012944/extended-near-infrared-photoactivity-of-bi%C3%A2-fe-1-9-co-0-1-ti%C3%A2-o-18-by-upconversion-nanoparticles
#11
Wen Ge, Zhiang Li, Tong Chen, Min Liu, Yalin Lu
Bi₆Fe1.9 Co0.1 Ti₃O18 (BFCTO)/NaGdF₄:Yb3+ , Er3+ (NGF) nanohybrids were successively synthesized by the hydrothermal process followed by anassembly method, and BFCTO-1.0/NGF nanosheets, BFCTO-1.5/NGF nanoplates and BFCTO-2.0/NGF truncated tetragonal bipyramids were obtained when 1.0, 1.5 and 2.0 M NaOH were adopted, respectively. Under the irradiation of 980 nm light, all the BFCTO samples exhibited no activity in degrading Rhodamine B (RhB). In contrast, with the loading of NGF upconversion nanoparticles, all the BFCTO/NGF samples exhibited extended near-infrared photoactivity, with BFCTO-1...
July 16, 2018: Nanomaterials
https://www.readbyqxmd.com/read/30011939/a-novel-radiation-method-for-preparing-mno%C3%A2-bc-monolith-hybrids-with-outstanding-supercapacitance-performance
#12
Fan Yang, Xichuan Liu, Rui Mi, Lei Yuan, Xi Yang, Minglong Zhong, Zhibing Fu, Chaoyang Wang, Yongjian Tang
A novel facile process for fabrication of amorphous MnO₂/bamboo charcoal monolith hybrids (MnO₂/BC) for potential supercapacitor applications using γ-irradiation methods is described. The structural, morphological and electrochemical properties of the MnO₂/BC hybrids have been investigated using X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), cyclic voltammetry (CV), galvanostatic charge/discharge (GCD) and electrochemical impedance spectroscopy (EIS) techniques...
July 14, 2018: Nanomaterials
https://www.readbyqxmd.com/read/30011931/effect-of-tb-doped-concentration-variation-on-the-electrical-and-dielectric-properties-of-caf%C3%A2-nanoparticles
#13
Xiaoyan Cui, Tingjing Hu, Jingshu Wang, Xin Zhong, Yinzhu Chen, Junkai Zhang, Xuefei Li, Jinghai Yang, Chunxiao Gao
Calcium fluoride (CaF₂) nanoparticles with various terbium (Tb) doping concentrations were investigated by X-ray diffraction (XRD), transmission electron microscopy (TEM), and alternating current (AC) impedance measurement. The original shape and structure of CaF₂ nanoparticles were retained after doping. In all the samples, the dominant charge carriers were electrons, and the F- ion transference number increased with increasing Tb concentration. The defects in the grain region considerably contributed to the electron transportation process...
July 14, 2018: Nanomaterials
https://www.readbyqxmd.com/read/30011917/thermal-and-guest-assisted-structural-transition-in-the-nh%C3%A2-mil-53-al-metal-organic-framework-a-molecular-dynamics-simulation-investigation
#14
Roald Boulé, Claire Roland, Laurent Le Pollés, Nathalie Audebrand, Aziz Ghoufi
Reversible structural transition between the Large (LP) and Narrow Pore (NP) forms (breathing phenomena) of the MIL-53(X, X = Al, Cr, Fe, Ga) Metal Organic Framework (MOF) is probably one of the most amazing physical properties of this class of soft-porous materials. Whereas great attention has been paid to the elucidation of the physical mechanism ruling this reversible transition, the effect of the functionalization on the flexibility has been less explored. Among functionalized MIL-53(Al) materials, the case of NH2-MIL-53(Al) is undoubtedly a very intriguing structural transition rarely observed, and the steadier phase corresponds to the narrow pore form...
July 14, 2018: Nanomaterials
https://www.readbyqxmd.com/read/30011892/characterization-and-applications-of-nanoparticles-modified-in-flight-with-silica-or-silica-organic-coatings
#15
Patrick Post, Lisa Wurlitzer, Wolfgang Maus-Friedrichs, Alfred P Weber
Nanoparticles are coated in-flight with a plasma-enhanced chemical vapor deposition (PECVD) process at ambient or elevated temperatures (up to 300 °C). Two silicon precursors, tetraethyl orthosilicate (TEOS) and hexamethyldisiloxane (HMDSO), are used to produce inorganic silica or silica-organic shells on Pt, Au and TiO₂ particles. The morphology of the coated particles is examined with transmission electron microscopy (TEM) and the chemical composition is studied with Fourier-transform infrared spectroscopy (FTIR), Energy-dispersive X-ray spectroscopy (EDX) and X-ray photoelectron spectroscopy (XPS)...
July 14, 2018: Nanomaterials
https://www.readbyqxmd.com/read/30011881/spontaneous-shape-alteration-and-size-separation-of-surfactant-free-silver-particles-synthesized-by-laser-ablation-in-acetone-during-long-period-storage
#16
Dongshi Zhang, Wonsuk Choi, Jurij Jakobi, Mark-Robert Kalus, Stephan Barcikowski, Sung-Hak Cho, Koji Sugioka
The technique of laser ablation in liquids (LAL) has already demonstrated its flexibility and capability for the synthesis of a large variety of surfactant-free nanomaterials with a high purity. However, high purity can cause trouble for nanomaterial synthesis, because active high-purity particles can spontaneously grow into different nanocrystals, which makes it difficult to accurately tailor the size and shape of the synthesized nanomaterials. Therefore, a series of questions arise with regards to whether particle growth occurs during colloid storage, how large the particle size increases to, and into which shape the particles evolve...
July 13, 2018: Nanomaterials
https://www.readbyqxmd.com/read/30011866/printable-nanomaterials-for-the-fabrication-of-high-performance-supercapacitors
#17
REVIEW
Jiazhen Sun, Bo Cui, Fuqiang Chu, Chenghu Yun, Min He, Lihong Li, Yanlin Song
In recent years, supercapacitors are attracting great attention as one kind of electrochemical energy storage device, which have a high power density, a high energy density, fast charging and discharging, and a long cycle life. As a solution processing method, printing technology is widely used to fabricate supercapacitors. Printable nanomaterials are critical to the fabrication of high-performance supercapacitors by printing technology. In this work, the advantages of printing technology are summarized. Moreover, various nanomaterials used to fabricate supercapacitors by printing technology are presented...
July 13, 2018: Nanomaterials
https://www.readbyqxmd.com/read/30011849/single-walled-carbon-nanotube-swcnt-loaded-porous-reticulated-vitreous-carbon-rvc-electrodes-used-in-a-capacitive-deionization-cdi-cell-for-effective-desalination
#18
Ali Aldalbahi, Mostafizur Rahaman, Mohammed Almoiqli, Abdelrazig Hamedelniel, Abdulaziz Alrehaili
Acid-functionalized single-walled carbon nanotube (a-SWCNT)-coated reticulated vitreous carbon (RVC) composite electrodes have been prepared and the use of these electrodes in capacitive deionization (CDI) cells for water desalination has been the focus of this study. The performance of these electrodes was tested based on the applied voltage, flow rate, bias potential and a-SWCNT loadings, and then evaluated by electrosorption dynamics. The effect of the feed stream directly through the electrodes, between the electrodes, and the distance between the electrodes in the CDI system on the performance of the electrodes has been investigated...
July 13, 2018: Nanomaterials
https://www.readbyqxmd.com/read/30011840/enhanced-visible-light-driven-photocatalytic-behavior-of-bifeo%C3%A2-reduced-graphene-oxide-composites
#19
Yun-Hui Si, Yu Xia, Shao-Ke Shang, Xin-Bo Xiong, Xie-Rong Zeng, Ji Zhou, Ya-Yun Li
BiFeO₃/Reduced Graphene Oxide (BFO/RGO) composites have been fabricated by a simple hydrothermal method. The X-ray diffraction (XRD), scanning electron microscopy (SEM), Raman, and X-ray photoelectron spectroscopy (XPS) analysis reveal that graphene oxide was reduced in hydrothermal process and BFO/RGO composites were successfully synthesized. UV-visible absorption and photoluminescence properties show that the introduction of RGO can effectively reduce the recombination of photogenerated electron and hole pairs...
July 13, 2018: Nanomaterials
https://www.readbyqxmd.com/read/30011837/percolated-si-sio%C3%A2-nanocomposites-oven-vs-millisecond-laser-induced-crystallization-of-sio-x-thin-films
#20
Erik Schumann, René Hübner, Jörg Grenzer, Sibylle Gemming, Matthias Krause
Three-dimensional nanocomposite networks consisting of percolated Si nanowires in a SiO2 matrix, Si:SiO2, were studied. The structures were obtained by reactive ion beam sputter deposition of SiOx (x ≈ 0.6) thin films at 450 ∘C and subsequent crystallization using conventional oven, as well as millisecond line focus laser treatment. Rutherford backscattering spectrometry, Raman spectroscopy, X-ray diffraction, cross-sectional and energy-filtered transmission electron microscopy were applied for sample characterization...
July 13, 2018: Nanomaterials
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