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Nanotechnology

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https://www.readbyqxmd.com/read/30658349/amorphous-phosphorus-doped-mos2-catalyst-for-efficient-hydrogen-evolution-reaction
#1
Dezhi Wang, Yingying Xie, Zhuangzhi Wu
Water splitting is an important method for producing clean and sustainable hydrogen to replace finite fossil fuels in future energy systems. MoS2 is reported as a promising catalyst without noble metallic element to accelerate electrocatalytic hydrogen evolution reaction (HER) rate. While, the further improvement of the MoS2-based catalyst is still strongly demanded to meet the real needs. In the present study, a novel amorphous phosphorus-doped MoS2 (P-MoS2) nanocomposite is prepared by a facile hydrothermal method...
January 18, 2019: Nanotechnology
https://www.readbyqxmd.com/read/30658345/towards-electrically-driven-semiconductor-nanowire-lasers
#2
Yunyan Zhang, Dhruv Saxena, Martin Aagesen, Liu Huiyun
Semiconductor NanoWire (NW) lasers are highly promising for making new generation coherent light sources with the advantages of ultra-small size, high efficiency, easy integration and low cost. Over the past 15 years, this area of research has been developing rapidly, with extensive reports of optically pumped lasing in various inorganic and organic semiconductor NWs. Motivated by these developments, substantial efforts are being made to make NW lasers electrically pumped, which is necessary for their practical implementation...
January 18, 2019: Nanotechnology
https://www.readbyqxmd.com/read/30657742/plasmonic-roller-lithography
#3
Xi Chen, Sung Ho Lee, Cheng Zhang, Qiaochu Li, Kaito Yamada, Moon Kyu Kwak, L Jay Guo
Photo roller lithography systems can generate patterns continuously over large areas by employing flexible photomasks on rotating quartz cylinders. In comparison, plasmonic lithography systems can reach deep sub-wavelength resolution utilizing evanescent waves carrying high spatial frequency components. In this work, we demonstrate a plasmonic roller system by integrating a quartz mechanical roller with a specially designed photomask based on plasmonic waveguide lithography. Deep sub-wavelength uniform patterns with high aspect ratios were printed continuously over a moving substrate...
January 18, 2019: Nanotechnology
https://www.readbyqxmd.com/read/30654356/wafer-scale-hfo-sub-2-sub-encapsulated-silicon-nanowire-field-effect-transistor-for-efficient-label-free-dna-hybridization-detection-in-dry-environment
#4
Ganesh Jayakumar, Maxime Legallais, Per-Erik Hellstrom, Mireille Mouis, Isabelle Pignot-Paintrand, Valerie Stambouli-Sene, Céline Ternon, Mikael Östling
Silicon nanowire (SiNW) charge based biosensors are attractive for DNA sensing applications due to their compactness and large surface-to-volume ratio. Small feature size, low production cost, repeatability, high sensitivity and selectivity are some of the key requirements for biosensors. The most common e-beam manufacturing method employed to manufacture sub-nm SiNWs is both cost and time intensive. Therefore, we propose a highly reproducible CMOS industry grade low-cost process to fabricate SiNW based field effect transistors on 4"-wafers...
January 17, 2019: Nanotechnology
https://www.readbyqxmd.com/read/30654351/intense-pulsed-light-a-promising-technique-to-develop-molybdenum-sulfide-catalysts-for-hydrogen-evolution
#5
Alexander Gupta, Krishnamraju Ankireddy, Bijendra Kumar, Adel Alruqi, Jacek Jasinski, Gautam Gupta, Thad Druffel
We have demonstrated a simple and scalable fabrication process for defect-rich MoS<sub>2</sub> layers directly from ammonium tetrathiomolybdate precursor using intense pulse light treatment in milliseconds durations. The formation of MoS<sub>2</sub> from the precursor solution after intense pulsed light exposure was confirmed with XPS, XRD, electron microscopy and Raman spectroscopy. The resulting material exhibited high activity for the hydrogen evolution reaction (HER) in acidic media, requiring merely 200 mV vs...
January 17, 2019: Nanotechnology
https://www.readbyqxmd.com/read/30654348/targeted-arsenite-loaded-magnetic-multifunctional-nanoparticles-for-treatment-of-hepatocellular-carcinoma
#6
Xiaoqin Chi, Renyuan Zhang, Tian Zhao, Xuanqing Gong, Ruixue Wei, Zhenyu Yin, Hongyu Lin, Dan Li, Hong Shan, Jinhao Gao
Arsenic trioxide (ATO), an FDA-approved drug for acute promyelocytic leukemia, also has great potential for treatment of solid tumors. Drug delivery powered by recent advances in nanotechnology has boosted the efficacy of many drugs, which is enlightening for applications of ATO in treating solid tumors. Herein, we reported arsenite-loaded multifunctional nanoparticles that are capable of pH-responsive ATO release for treating hepatocellular carcinoma (HCC) and real-time monitoring via magnetic resonance imaging (MRI)...
January 17, 2019: Nanotechnology
https://www.readbyqxmd.com/read/30654347/vanadium-based-nanowires-for-sodium-ion-batteries
#7
Yu Cheng, Yangyang Xia, Yiming Chen, Qin Liu, Tong Ge, Lin Xu, Liqiang Mai
Sodium-ion batteries(SIBs) have received a giant attention because of its abundance source and low cost. To date, some Na+ storage materials have achieved great performance, but the larger Na+ radius and more complex Na+ storage mechanism compared with Li+ still limit the energy density and power density. This review systematically summarizes emerging synthetic technologies of vanadium-based materials from simple nanowires to some complicated modified/optimized structures. In addition, vanadium-based nanowire materials are reviewed on both cathode and anode side, advantages and drawbacks are proposed to explain the challenges of application about novel materials...
January 17, 2019: Nanotechnology
https://www.readbyqxmd.com/read/30654343/rational-design-of-nanowire-solar-cells-from-single-nanowire-to-nanowire-arrays
#8
Wanghua Chen, Pere Roca I Cabarrocas
In this review, we report several rational designs of nanowire-based solar cells from single nanowire to nanowire arrays. Two methods of nanowires fabrication: via "top-down" and "bottom-up", and two types of configurations including axial and radial junction are presented for nanowire based solar cells. To enhance absorption, several photon management schemes are shown in detail, including anti-reflection coating, diffractive grating, and plasmonics. Considering the rational design of nanowire arrays, we summarize a total of seven solar cell structures including axial junctions, radial junctions, substrate interfacial junctions, planar junctions, conductors, junctionless and tandem...
January 17, 2019: Nanotechnology
https://www.readbyqxmd.com/read/30654342/low-dose-curcuminoid-loaded-in-dextran-nanobubbles-can-prevent-metastastatic-spreading-in-prostate-cancer-cells
#9
Federica Bessone, Monica Argenziano, Giorgio Grillo, Benedetta Ferrara, Stefania Pizzimenti, Giuseppina Barrera, Giancarlo Cravotto, C Guiot, Ilaria Stura, Roberta Cavalli, Chiara Dianzani
Preventing recurrences and metastasis of Prostate Cancer after prostatectomy by administering adjuvant therapies is a quite controversial issue. In addition to effectiveness, absence of side effects and long term toxicity are mandatory. Curcuminoids (Curc) extracted with innovative techniques and effectively loaded by polymeric nanobubbles (Curc-NBs) satisfy such requirements. Curc-NBs showed stable over 30 days, were effectively internalized by tumor cells and were able to slowly release Curc in a sustained way...
January 17, 2019: Nanotechnology
https://www.readbyqxmd.com/read/30654338/high-voltage-endurance-and-switchable-resistance-effect-observed-in-nanoscale-copper-groove-structure
#10
Zhikai Gan, Bugao Zou, Peiqi Zhou, Xu Huang, Chunlian Mei, Hui Wang
A switchable lateral resistance effect with high reverse voltage has been observed in nanoscale copper groove structure. With the stimulation of electric pulse and local illumination of laser, the lateral resistance of the structure can be modulated in a non-volatile manner. We attribute this phenomenon to the different width of depletion region and the Schottky barrier change caused by the nanoscale charge trapping effect. This work may inspire new approach of resistance modulation and help the development of laser-assisted electric pulse merged devices...
January 17, 2019: Nanotechnology
https://www.readbyqxmd.com/read/30654336/detection-of-the-conformational-changes-of-i-discosoma-i-red-fluorescent-proteins-adhered-on-silver-nanoparticles-based-nanocomposites-i-via-i-surface-enhanced-raman-scattering
#11
Adriana Scarangella, Marvine Soumbo, Adnen Mlayah, Caroline Bonafos, Marie-Carmen Monje, Christine Roques, Cecile Marcelot, Nicolas Large, Thameur Dammak, Kremena Makasheva
Description of the relationship between protein structure and function remains a primary focus in molecular biology, biochemistry, protein engineering and bioelectronics. Moreover, the investigation of the protein conformational changes after adhesion and dehydration is of importance to tackle problems related to the interaction of proteins with solid surfaces. In this paper the conformational changes of <i>Discosoma</i> recombinant red fluorescent proteins (DsRed) adhered on silver nanoparticles (AgNPs)-based nanocomposites are explored <i>via</i> Surface enhanced Raman scattering (SERS)...
January 17, 2019: Nanotechnology
https://www.readbyqxmd.com/read/30654335/facile-fabrication-of-zno-nanowire-memory-device-based-on-chemically-treated-surface-defects
#12
Woojin Park, Tae Hyeon Kim, Jae Hyeon Nam, Hye Yeon Jang, Yusin Pak, Jung-Wook Min, Joho Yun, Byungjin Cho
In this study, we demonstrate a transistor-type ZnO nanowire (NW) memory device based on the surface defect states of a rough ZnO NW, which is obtained by introducing facile H2O2 solution treatment. The surface defect states of the ZnO NW are validated by photoluminescence characterization. A memory device based on the rough ZnO NW exhibits clearly separated bi-stable states (ON and OFF states). A significant current fluctuation does not exist during repetitive endurance cycling test. Stable memory retention characteristics are also achieved at a high temperature of 85 °C and at room temperature...
January 17, 2019: Nanotechnology
https://www.readbyqxmd.com/read/30654333/adsorbate-enhanced-field-emission-from-single-walled-carbon-nanotubes-a-comparative-first-principles-study
#13
Ehsanur Rahman, Alireza Nojeh
We report a comparative ab-initio study of different types of adsorbates and their adsorption mechanism on the field-emission performance of single-walled carbon nanotubes by analyzing electrical properties and transport characteristics and considering the thermal stability of the adsorbed structure. Adsorbates were found to reduce the work function by up to 1.3 eV, enhance tunneling near the carbon nanotube tip, and increase the field-emission current by as much as two orders of magnitude. A significant localization of the electron cloud was also observed near the adsorbates under a high applied electric field...
January 17, 2019: Nanotechnology
https://www.readbyqxmd.com/read/30650401/recent-progress-in-the-controlled-synthesis-of-2d-metallic-transition-metal-dichalcogenides
#14
Zhepeng Zhang, Pengfei Yang, Min Hong, Shaolong Jiang, Guanchao Zhao, Jianping Shi, Yanfeng Zhang
Two-dimensional (2D) metallic transition metal dichalcogenides (MTMDCs), the complement of 2D semiconducting TMDCs, have attracted extensive attentions in recent years because of their versatile properties such as superconductivity, charge density wave, and magnetism. To promote the investigations of their fantastic properties and broad applications, the preparation of large-area, high-quality, and thickness-tunable 2D MTMDCs has become a very urgent topic and great efforts have been made. This topical review therefore focuses on the introduction of the recent achievements for the controllable syntheses of 2D MTMDCs (VS<sub>2</sub>, VSe<sub>2</sub>, TaS<sub>2</sub>, TaSe<sub>2</sub>, NbS<sub>2</sub>, NbSe<sub>2</sub>, <i>etc...
January 16, 2019: Nanotechnology
https://www.readbyqxmd.com/read/30650397/synthesis-and-biological-evaluation-of-2-4-nm-thiolate-protected-gold-nanoparticles-conjugated-to-cetuximab-for-targeting-glioblastoma-cancer-cells-via-the-egfr
#15
Nadja Groysbeck, Audrey Stoessel, Mariel Donzeau, Elisabete Cruz da Silva, Maxime Lehmann, Jean-Marc Strub, Sarah Cianferani, Kassiogé Dembélé, Guy Zuber
Therapeutic monoclonal antibodies benefit to patients and the conjugation to gold nanoparticles (AuNPs) might bring additional activities to these macromolecules. However, the behavior of the conjugate will largely depend on the bulkiness of the AuNP and small sizes are moreover preferable for diffusion. Water-soluble thiolate-protected AuNPs having diameters of 2 to 3 nm can be synthesized with narrow polydispersity and can selectively react with incoming organic thiols via a SN2-like mechanism. We therefore synthesized a mixed thionitrobenzoic acid-, thioaminobenzoic acid- monolayered AuNP of 2...
January 16, 2019: Nanotechnology
https://www.readbyqxmd.com/read/30650393/a-facile-coprecipitation-method-to-fexoy-fe-decorated-graphite-sheets-with-enhanced-microwave-absorption-properties
#16
Rui Meng, Tao Zhang, Haijing Yu, Jian Zhang, Guangwu Wen, Xiaoxiao Huang, Longnan Huang, Long Xia, Bo Zhong
FexOy/Fe decorated graphite sheets (DGS) are synthesized by a facile coprecipitation method followed by heat treatment under different conditions. The size and chemical composition of the particles loaded on graphite sheets (GS) can be tailored by adjusting the heat treatment temperature and atmosphere. The obtained α-Fe2O3 DGS (S1), Fe3O4 DGS (S2 and S3), and Fe DGS (S4) all exhibit excellent electromagnetic (EM) wave absorption when compared with conventional graphite/magnetic-particles composites. The minimum reflection loss (RL) can reach -42...
January 16, 2019: Nanotechnology
https://www.readbyqxmd.com/read/30650390/probing-the-light-hole-heavy-hole-switching-with-correlated-magneto-optical-spectroscopy-and-chemical-analysis-on-a-single-quantum-dot
#17
Alberto Artioli, Pamela Rueda-Fonseca, Kimon Moratis, Jean Francois Motte, Fabrice Donatini, Martien den Hertog, Eric Robin, Régis André, Yann-Michel Niquet, Edith Bellet-Amalric, Joel Cibert, David Ferrand
A whole series of complementary studies have been performed on the
 same, single nanowire containing a quantum dot: cathodoluminescence
 spectroscopy and imaging, micro-photoluminescence spectroscopy under
 magnetic field and as a function of temperature, and
 energy-dispersive X-ray spectrometry and imaging. The ZnTe nanowire
 was deposited on a Si$_3$N$_4$ membrane with Ti/Al patterns. The
 complete set of data shows that the CdTe quantum dot features the
 heavy-hole state as a ground state, although the compressive
 mismatch strain promotes a light-hole ground state as soon as the
 aspect ratio is larger than unity (elongated dot)...
January 16, 2019: Nanotechnology
https://www.readbyqxmd.com/read/30650385/morphology-controlled-synthesis-of-boehmite-with-enhanced-efficiency-for-the-removal-of-aqueous-cr-vi-and-nitrates
#18
Jiacheng Li, Miao Li, Xu Yang, Yu Zhang, Xiang Liu, Fang Liu, Fanbin Meng
Boehmite with different morphologies was synthesized using a simple hydrothermal method for the removal of Cr(VI) and nitrates from polluted water. When pH of the hydrothermal system was changed, the final crystallization products had morphologies of one-dimensional rods or two-dimensional sheets with different sizes. The boehmites were characterized by XRD, BET, SEM and Py-IR, and used for the adsorption of aqueous Cr(VI) and nitrates. Their bulk structure and surface properties significantly changed with the corresponding morphology, which prominently affected their adsorption capacity...
January 16, 2019: Nanotechnology
https://www.readbyqxmd.com/read/30645989/high-performance-supercapacitors-using-lignin-based-electrospun-carbon-nanofiber-electrodes-in-ionic-liquid-electrolytes
#19
Rangana A L Perera Jayawickramage, John P Ferraris
Flexible, free standing and binder free electrodes were fabricated by electrospinning from a series of lignin: polyvinylalcohol (PVA) polymer blends, followed by heat treatment. PVA has the dual function of facilitating the electrospinning of lignin and acting as a sacrificial polymer. Upon stabilization, carbonization and CO<sub>2</sub> activation, carbon nanofibers (ACNF) derived from the lignin:PVA 80:20 blend displayed a high surface area of 2170 m<sup>2</sup>/g and a mesopore volume of 0...
January 15, 2019: Nanotechnology
https://www.readbyqxmd.com/read/30645984/nano-lipospheres-as-acoustically-active-ultrasound-contrast-agents-evolving-tumor-imaging-and-therapy-technique
#20
Laura Emma Andrews, Ming-Hsien Chan, Ru-Shi Liu
Applying nanobubbles (NBs) for contrast-enhanced ultrasound imaging has received increased attention. NBs are biocompatible, multifunctional, theranostic agents. Their properties of, high echogenicity and stability create an agent suitable for ultrasonography diagnosis. Their favorable properties of size, in vivo stability, and ease of modification are being exploited to implement a theranostic platform for cancer treatment. The considerable development offers the potential to overcome drug resistance and adverse side effects that are associated with traditional chemotherapy...
January 15, 2019: Nanotechnology
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