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Nanotechnology

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https://www.readbyqxmd.com/read/30240367/study-of-the-growth-mechanisms-of-nanoporous-ag-flowers-for-non-enzymatic-glucose-detection
#1
Jianan Chen, Chang Liu, Yu-Ting Huang, Hyeonseok Lee, Shien-Ping Feng
Highly sensitive and selective non-enzymatic glucose detection was developed using nanoporous Ag flowers on a Ni substrate. The cyclic scanning electrodeposition (CSE) method was used to fabricate Ag flowers on a Ni substrate in an alkaline electrolyte. The nanoporous Ag flowers were then formed by repeated CSE in NaOH. The growth mechanisms of the nanoporous Ag flowers were systematically studied, and these mechanisms can be extended to the formation of other metal, bimetallic or metal oxides. The synthesized three-dimensional nanoporous Ag flowers on the Ni substrate were used in the electro-oxidation of glucose detection, demonstrating a wide linear range (0...
September 21, 2018: Nanotechnology
https://www.readbyqxmd.com/read/30240366/approaches-for-the-quantitative-analysis-of-oxidation-state-in-cerium-oxide-nanomaterials
#2
Christopher Sims, Russell Maier, Aaron Johnston-Peck, Justin Gorham, Vincent A Hackley, Bryant Nelson
Cerium oxide nanomaterials (nanoceria, CNMs) are receiving increased attention from the research community due to their unique chemical properties, most prominent of which is their ability to alternate between the Ce3+ and Ce4+ oxidation states. While many analytical techniques and methods have been employed to characterize the amounts of Ce3+ and Ce4+ present (Ce3+/Ce4+ ratio) within nanoceria materials, to-date no studies have used multiple complementary analytical tools (orthogonal analysis) with technique-independent oxidation state controls for quantitative determinations of the Ce3+/Ce4+ ratio...
September 21, 2018: Nanotechnology
https://www.readbyqxmd.com/read/30240365/a-three-dimensional-insight-into-correlation-between-carrier-lifetime-and-surface-recombination-velocity-for-nanowires
#3
Dingkun Ren, Zixuan Rong, Siddharth Somasundaram, Khalifa M Azizur-Rahman, Baolai Liang, Diana L Huffaker
The performance of nanowire-based devices is predominantly affected by nonradiative recombination on their surfaces, or sidewalls, due to large surface-to-volume ratios. A common approach to quantitatively characterize surface recombination is to implement time-resolved photoluminescence to correlate surface recombination velocity with measured minority carrier lifetime by a conventional analytical equation. However, after using numerical simulations based on a three-dimensional (3-D) transient model, we assert that the correlation between minority carrier lifetime and surface recombination velocity is dependent on a more complex combination of factors, including nanowire geometry, energy-band alignment, and spatial carrier diffusion in 3-D...
September 21, 2018: Nanotechnology
https://www.readbyqxmd.com/read/30240364/dual-plasmonic-au-graphene-au-enhanced-ultrafast-broadband-self-driven-silicon-schotty-photodetector
#4
Li Wang, Shujuan He, Kuiyuan Wang, Hehao Luo, Jigang Hu, Yongqiang Yu, Chao Xie, Chunyan Wu, Linbao Luo
High-performance photodetectors are desirable for various applications, including multi-wavelength image sensing, communication and safety monitoring. In this study, we report the construction of dual-surface plasmon enhanced silicon Schotty photodetector using Au nanoparticles (NPs)/graphene/Au NPs hybrid structure as electrode. It was found that the as-assembled device exhibited broad sensitivity ranging from ultraviolet to near-infrared light (360-1330nm) at room temperature, with high response speed of 360 ns and 3dB bandwidth of 780 kHz at zero bias...
September 21, 2018: Nanotechnology
https://www.readbyqxmd.com/read/30240363/vertically-aligned-graphene-nanowalls-grown-via-plasma-enhanced-chemical-vapor-deposition-as-a-binder-free-cathode-in-li-o-sub-2-sub-batteries
#5
Chih-Pin Han, Vediyappan Veeramani, Chen-Chih Hsu, Anirudha Jena, Ho C Chang, Nai-Chang Yeh, Shu-Fen Hu, Ru-Shi Liu
In the present report, vertically-aligned graphene nanowalls are grown on Ni-foam (VA-G/NF) using plasma-enhanced chemical vapor deposition (PECVD) method at room temperature. Optimization of the growth conditions provides graphene sheets with controlled defect sites. The unique architecture of the vertically aligned graphene sheets allows sufficient space for the ionic movement within the sheets and hence enhancing the catalytic activity. Further modification with ruthenium nanoparticles (Ru NPs) drop-casted on VA-G/NF improves the charge overpotential for lithium-oxygen (Li-O2) battery cycles...
September 21, 2018: Nanotechnology
https://www.readbyqxmd.com/read/30240362/a-simple-route-to-synchronized-nucleation-of-self-catalyzed-gaas-nanowires-on-silicon-for-sub-poissonian-length-distributions
#6
Tina Tauchnitz, Yury Berdnikov, Vladimir G Dubrovskii, Harald Schneider, Manfred Helm, Emmanouil Dimakis
We demonstrate a simple route to grow ensembles of self-catalyzed GaAs nanowires with a remarkably narrow statistical distribution of lengths on natively oxidized Si(111) substrates. The fitting of the nanowire length distribution with a theoretical model reveals that the key requirements for narrow length distributions are the synchronized nucleation of all nanowires on the substrate and the absence of beam shadowing from adjacent nanowires. Both requirements are fulfilled by controlling the size and number density of the openings in SiO<sub>x</sub>, where the nanowires nucleate...
September 21, 2018: Nanotechnology
https://www.readbyqxmd.com/read/30240361/modeling-nanoscale-temperature-gradients-and-conductivity-evolution-in-pulsed-light-sintering-of-silver-nanowire-networks
#7
Michael Dexter, Andrew Pfau, Zhongwei Gao, Gregory Herman, Chih-Hung Chang, Rajiv Malhotra
Sintering of metal nanowire networks on transparent polymers is an emerging approach for fabricating transparent conductive electrodes used in multiple devices. Pulsed Light Sintering is a scalable sintering process in which large-area, broad-spectrum xenon lamp light causes rapid nanowire fusion to increase network conductivity, while embedding the nanowires in the polymer to increase mechanical robustness. This paper develops a multiphysical approach for predicting evolution of conductivity, nanowire fusion and nanoscale temperature gradients during pulsed light sintering of silver nanowires on polycarbonate...
September 21, 2018: Nanotechnology
https://www.readbyqxmd.com/read/30234499/a-multi-level-memristor-based-on-atomic-layer-deposition-of-iron-oxide
#8
Samuele Porro, Katarzyna Bejtka, Alladin Jasmin, Marco Fontana, Gianluca Milano, Alessandro Chiolerio, Candido Fabrizio Pirri, Carlo Ricciardi
This work reports the fabrication of memristive devices based on iron oxide (Fe2O3) thin films grown by atomic layer deposition using ferrocene as iron precursor and ozone as oxidant. Excellent control of atomic layer deposition (ALD) is achieved by using an experimental procedure based on a sequence of micro-pulses, which provides long residence time and homogeneous diffusion of precursors, allowing ALD of thin films with smooth morphology and crystallinity increasing with layer thickness at temperatures as low as 250°C...
September 20, 2018: Nanotechnology
https://www.readbyqxmd.com/read/30234497/solution-blow-spinning-sbs-assisted-synthesis-of-well-defined-carboxymethyl-cellulose-cmc-nanowhiskers
#9
James Salva, Dale Daryl Gutierrez, Lorrain Ann Ching, Pamela Mae Ucab, Hercules Cascon, Noel Peter Bengzon Tan
In this study, synthesis of well-defined carboxymethyl cellulose (CMC) nanowhiskers through low-pressure solution blow spinning is achieved for the first time. A mixture of methanol, water, and carboxymethyl cellulose was sprayed through a locally available spray gun at 4 bars, and the collected sample was dried for two hours at 80°C. Scanning electron microscopy (SEM) and Fourier Transform Infrared (FTIR) spectroscopy characterized the samples. The results showed the successful production of numerous, uniform and well-defined nanowhiskers...
September 20, 2018: Nanotechnology
https://www.readbyqxmd.com/read/30229748/a-gold-nanoparticle-system-for-enhancement-of-radiotherapy-and-simultaneous-monitoring-of-reactive-oxygen-species-formation
#10
Jihye Choi, Kyungoh Jung, Edward E Graves, Guillem Pratx
Gold nanoparticles (AuNPs) are known to sensitize cancer cells to radiation therapy (RT) by increasing the deposition of ionizing energy in their immediate vicinity. However, this process of dose enhancement is challenging to monitor because it is heterogeneous at the sub-cellular scale. Furthermore, radiation damage is primarily mediated by reactive oxygen species (ROS) that are produced following water radiolysis. Here, radiation-responsive PEGylated gold nanoparticles (RPAuNPs) were synthesized for enhanced generation and concurrent detection of ROS in cancer cells and tumors...
September 19, 2018: Nanotechnology
https://www.readbyqxmd.com/read/30229744/efficient-ion-slicing-of-inp-thin-film-for-si-based-hetero-integration
#11
Jiajie Lin, Tiangui You, Mao Wang, Kai Huang, Shibin Zhang, Qi Jia, Min Zhou, Wen-Jie Yu, Shengqiang Zhou, Xi Wang, Xin Ou
Integration of high quality single crystalline InP thin film on Si substrate has potential impact on Si-based photonics and high-speed electronics. In this work, the exfoliation of 634 nm crystalline InP layer from the bulk substrate was achieved by co-implantation of He ions and H ions at room temperature. It is found that the sequence of He and H ions implantations has a decisive influence on the InP surface blistering and exfoliation, which only occurs in the InP pre-implanted with He ions. The exfoliation efficiency first increases and then decreases as a function of H ions fluence...
September 19, 2018: Nanotechnology
https://www.readbyqxmd.com/read/30229741/hierarchical-metal-polymer-metamaterials-of-tunable-negative-poisson-s-ratio-fabricated-by-initiator-integrated-3d-printing-i3dp
#12
Dongxing Zhang, Junfeng Xiao, Wangli Yu, Qiuquan Guo, Jun Yang
Metamaterials with artificially designed architectures can achieve unique and even unprecedented physical properties, which show promising applications in actuators, amplifiers, and micromechanical controls. An initiator-integrated 3D printing technology (i3DP) was applied in this study to create scalable, metal/polymer meta-mechanical materials which can be gradually to achieve negative Poisson's ratio, high strength and ultralow density, as well as high compressive and super-elastic behavior. The i3DP was enabled by integrating an atomic-transfer radical polymerization (ATRP) initiator with UV-curable resin, followed by polyelectrolyte brushes (PMETAC) grafting via surface-initiated ATRP and thereafter electroless plating (ELP) to form metal coatings...
September 19, 2018: Nanotechnology
https://www.readbyqxmd.com/read/30226471/enhanced-performance-of-hybrid-self-biased-heterojunction-photodetector-on-soft-lithographically-patterned-organic-platform
#13
Poulomi Chakrabarty, N Gogurla, Nandini Bhandaru, Samit K Ray, Rabibrata Mukherjee
Nanopatterning of the active layer with feature size comparable to the wavelength of visible light is a popular strategy for improving the performance of optoelectronic devices, as these structures enhance the optical path length by light trapping due to combined contribution of multiple scattering, diffraction, and antireflection. Here, we report the fabrication of ZnO/CdS self-biased heterojunction photodetectors on soft lithographically patterned PEDOT:PSS layers with grating geometry. The present study combines the robustness of inorganic devices along with the convenience of easy patterning capability of an organic PEDOT:PSS layer...
September 18, 2018: Nanotechnology
https://www.readbyqxmd.com/read/30222130/reverse-engineering-of-graphene-on-metal-surfaces-a-case-study-of-embedded-ruthenium
#14
Ann Lii-Rosales, Yong Han, Ka Man Yu, Dapeng Jing, Nathaniel Andrew Anderson, David Vaknin, Michael C Tringides, J W Evans, Michael S Altman, Patricia A Thiel
Using scanning tunneling microscopy, X-ray photoelectron spectroscopy, and X-ray absorption spectroscopy, we show that Ru forms metallic nanoislands on graphite, covered by a graphene monolayer. These islands are air-stable, contain 2-4 layers of Ru, and have diameters on the order of 10 nm. To produce these nanoislands two conditions must be met during synthesis. The graphite surface must be ion-bombarded, and subsequently held at elevated temperature (1000-1180 K) during Ru deposition. A coincidence lattice forms between the graphene overlayer and the Ru island top...
September 17, 2018: Nanotechnology
https://www.readbyqxmd.com/read/30222129/band-gap-engineering-of-a-mos2-monolayer-through-oxygen-alloying-an-ab-initio-study
#15
Noeliarinala Felana Andriambelaza, Edwin Mapasha, Nithaya Chetty
Oxygen (O) alloying in a MoS<sub>2</sub> monolayer appearing in different shapes: line-ordered, cluster and random have been theoretically designed, for band gap engineering in order to extend its nanotechnological applications. The thermodynamic stability, structural and electronic properties of these alloy configurations at each concentration have been comparatively studied using the density functional theory methods. Based on the formation energy analysis, the O line-ordered alloys are most stable compared to the well known random and cluster alloys at high concentration, while at low concentration they compete...
September 17, 2018: Nanotechnology
https://www.readbyqxmd.com/read/30215619/ultrahigh-photoresponsivity-mos-sub-2-sub-photodetector-with-tunable-photocurrent-generation-mechanism
#16
Guangjian Wu, Xudong Wang, Yan Chen, Zhen Wang, Hong Shen, Tie Lin, Wei-Da Hu, Jianlu Wang, Shan-Tao Zhang, Xiangjian Meng, Junhao Chu
Photodetectors with two-dimensional (2D) materials on a SiO2/Si substrate have been extensively explored. However, these photodetectors often suffer from a large gate voltage and relatively low photoresponsivity due to the low efficiency light absorption of 2D materials. Here, we develop a MoS2 photodetector based on the Al2O3/ITO (indium tin oxide) /SiO2/Si substrate with ultrahigh photoresponsivity of 2.7×104 A W-1. Most of the incident light is reflected by the interface of stacked Al2O3/ITO/SiO2 substrate, which significantly increases the light absorption of 2D materials...
September 14, 2018: Nanotechnology
https://www.readbyqxmd.com/read/30215618/synthesis-of-superhydrophobic-surfaces-with-wenzel-and-cassie-baxter-state-experimental-evidence-and-theoretical-insight
#17
Xia Zhang, Bei Ding, Yifei Bian, Dong Jiang, Ivan P Parkin
We demonstrate surfactant and template free synthesis of superhydrophobic thin films by controlling surface morphology. The surface morphology evolution process was determined from time dependent studies. The relationships between the water contact angle, the sliding angle, water droplet size, and the surface microstructures was investigated. It is found that structural parameters play an important role in determining the adhesion of a droplet on superhydrophobic surfaces and the liquid-solid adhesion can be effectively manipulated through tailoring the morphology or the size of the microstructures on the surface...
September 14, 2018: Nanotechnology
https://www.readbyqxmd.com/read/30215617/radiation-tolerance-of-la-doped-nanocrystalline-steel-under-heavy-ion-irradiation-at-different-temperature
#18
Yuan Fang, Wei Ge, Tengfei Yang, Congcong Du, Chenxu Wang, Shaoshuai Liu, Youping Lu, Zhanfeng Yan, Haocheng Liu, Feng Liu, Gen Yang, Tongde Shen, Yugang Wang
Nanostructured materials have great potential for using as structural materials in advanced nuclear reactors due to the high density of grain boundaries which can serve as sinks to absorb irradiation-induced defects. In the present study, the irradiation tolerance of a La-doped nanocrystalline 304 austenitic stainless steel (NC-La) with grain size about 40 nm was investigated under irradiation of 6 MeV Au ions to 1.5×1016 ions/cm2 at 600 ℃ and room temperature. Compared to its coarse-grained counterpart, in La-doped nanocrystalline steel no visible voids were observed at high temperature irradiation and no significant difference in extended defects, such as irradiation-induced dislocation loops or clusters, were found between irradiated and unirradiated area at room temperature irradiation...
September 14, 2018: Nanotechnology
https://www.readbyqxmd.com/read/30215615/simulating-advanced-focused-ion-beam-nanomachining-a-quantitative-comparison-of-simulation-and-experimental-results
#19
Kyle Thomas Mahady, Shida Tan, Yuval Greenzweig, Amir Raveh, Philip D Rack
A simulation study of focused ion beam (FIB) sputtering in SiO2 is presented. The basis of this study is an enhanced version of the EnvizION Monte Carlo simulation program for FIB processing, which previously was restricted to targets composed of a single atom. A Monte Carlo method is presented for the simulation of FIB sputtering in SiO2 in three dimensions, with ion implantation, to elucidate the complex dynamics of nanoscale milling of compound targets. This method is applied to the simulation of sputtering experiments using both Ne+ and Ga+ ion beams...
September 14, 2018: Nanotechnology
https://www.readbyqxmd.com/read/30215613/poole-frenkel-emission-on-functionalized-multilayered-packed-reduced-graphene-oxide-nanoplatelets
#20
Mawin Martinez Martínez, Rafael Furlan de Oliveira, Flavio Makoto Shimizu, Carlos César Bof Bufon, Varlei Rodrigues, Ângelo L Gobbi, Maria Helena O Piazzetta, Antonio Riul
The unique electronic, mechanical and optical properties of graphene make it a remarkable 2D material, widely explored in a plethora of applications. However, graphene zero-band gap and the production of defect-free pristine graphene in large areas still limit some applications. To circumvent these issues, graphene-derived 2D materials have arisen as attractive candidates for low-dimensional systems, which requires a better comprehension of their properties. Here, we report a detailed investigation of the conduction mechanisms of two functionalized reduced graphene oxides (rGOs) nanoplatelets, named GPAH and GPSS...
September 14, 2018: Nanotechnology
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