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https://www.readbyqxmd.com/read/28211471/phosphorene-quantum-dot-saturable-absorbers-for-ultrafast-fiber-lasers
#1
J Du, M Zhang, Z Guo, J Chen, X Zhu, G Hu, P Peng, Z Zheng, H Zhang
We fabricate ultrasmall phosphorene quantum dots (PQDs) with an average size of 2.6 ± 0.9 nm using a liquid exfoliation method involving ultrasound probe sonication followed by bath sonication. By coupling the as-prepared PQDs with microfiber evanescent light field, the PQD-based saturable absorber (SA) device exhibits ultrafast nonlinear saturable absorption property, with an optical modulation depth of 8.1% at the telecommunication band. With the integration of the all-fiber PQD-based SA, a continuous-wave passively mode-locked erbium-doped (Er-doped) laser cavity delivers stable, self-starting pulses with a pulse duration of 0...
February 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28209054/confinement-of-ultrasmall-cu-znox-nanoparticles-in-metal-organic-frameworks-for-selective-methanol-synthesis-from-catalytic-hydrogenation-of-co2
#2
Bing An, Jingzheng Zhang, Kang Cheng, Pengfei Ji, Cheng Wang, Wenbin Lin
The interfaces of Cu/ZnO and Cu/ZrO2 play vital roles in the hydrogenation of CO2 to methanol by these composite catalysts. Surface structural reorganization and particle growth during catalysis deleteriously reduce these active interfaces, diminishing both catalytic activities and MeOH selectivities. Here we report the use of pre-assembled bpy and Zr6(μ3-O)4(μ3-OH)4 sites in UiO-bpy metal-organic frameworks (MOFs) to anchor ultrasmall Cu/ZnOx nanoparticles, thus preventing the agglomeration of Cu NPs and phase separation between Cu and ZnOx in MOF cavity-confined Cu/ZnOx nanoparticles...
February 17, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28208642/photoluminescent-gold-nanoclusters-in-cancer-cells-cellular-uptake-toxicity-and-generation-of-reactive-oxygen-species
#3
Marija Matulionyte, Dominyka Dapkute, Laima Budenaite, Greta Jarockyte, Ricardas Rotomskis
In recent years, photoluminescent gold nanoclusters have attracted considerable interest in both fundamental biomedical research and practical applications. Due to their ultrasmall size, unique molecule-like optical properties, and facile synthesis gold nanoclusters have been considered very promising photoluminescent agents for biosensing, bioimaging, and targeted therapy. Yet, interaction of such ultra-small nanoclusters with cells and other biological objects remains poorly understood. Therefore, the assessment of the biocompatibility and potential toxicity of gold nanoclusters is of major importance before their clinical application...
February 10, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28194985/nano-endoscopy-with-plasmon-enhanced-fluorescence-for-sensitive-sensing-inside-ultrasmall-volume-samples
#4
Hang Yuan, Jie Liu, Yuexiang Lu, Zhe Wang, Guoyu Wei, Tianhao Wu, Gang Ye, Jing Chen, Sichun Zhang, Xinrong Zhang
Plasmon-enhanced fluorescence (PEF) generally requires the samples settled on a metal substrate and the effective enhancement distance is less than 100 nm, which limit its application in intracellular sensing. Herein, we report a nano endoscopy with PEF effect for sensing analytes inside the extremely small volume samples. The nano endoscopy was fabricated by assembling single nanoporous gold nanowire (PGNW) on the tip of a tungsten needle. It was accurately manipulated to insert into a micro droplet, and an effective sensing was realized at micrometre scale with submicrometer resolution...
January 17, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28194951/electrostatic-ion-enrichment-in-an-ultrathin-layer-cell-with-a-critical-dimension-between-5-and-20-nm
#5
Jin Lu, Bo Zhang
Electrostatic interactions play an essential role in many analytical applications including molecular sensing and transport studies using nanopores and separation of charged species. Here, we report the voltammetric quantification of electrostatic ion enrichment in a 5-20 nm thin electrochemical cell. A simple lithographic micro/nanofabrication process was used to create ultrathin-layer cells (UTLCs) with a critical dimension (i.e., cell thickness) as small as 5 nm. The voltammetric response of a UTLC was found to be largely dominated by the electrostatic interaction between charges on the cell walls and the redox species...
February 10, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28165220/one-step-synthesis-of-uniform-sno2-electrode-by-uv-curing-technology-toward-enhanced-lithium-ion-storage
#6
Hang Wei, Zhonghong Xia, Dingguo Xia
A uniform anode material composed of ultrasmall tin oxide (SnO2) nanoparticles with an excellent lithium-ion (Li-ion) storage performance is obtained for the first time through one step UV curing technology. The diameter of ∼3 nm-sized SnO2 particles is uniformly dispersed in the styrylpyridinium (SbQ) polymer because of its photo-cross-linking property. The in situ cross-linking of SbQ polymer not only assist synthesis of uniform ultrasmall SnO2, but act as a strong adhesion binder on SnO2 nanoparticles, thereby effectively accommodating the volume expansion of SnO2 anodes during cycling process...
February 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28158033/ultrasmall-in-plane-photonic-crystal-demultiplexers-fabricated-with-photolithography
#7
Yuta Ooka, Tomohiro Tetsumoto, Nurul Ashikin Binti Daud, Takasumi Tanabe
We demonstrate ultrasmall demultiplexers based on photolithographic photonic crystals. The footprint of the demultiplexers is 110 μm<sup>2</sup> per channel. Our in-plane demultiplexers are clad with silica, which makes them stable and easy to integrate with other silicon photonic devices. We describe two types of demultiplexers with spacings of 136 and 267 GHz between channels for application to dense wavelength division multiplexing. Integrated titanium nitride heaters allow us to precisely control the channel wavelength...
January 23, 2017: Optics Express
https://www.readbyqxmd.com/read/28150835/ultraviolet-saturable-absorption-and-ultrafast-carrier-dynamics-in-ultrasmall-black-phosphorus-quantum-dots
#8
Y W Wang, S Liu, B W Zeng, H Huang, J Xiao, J B Li, M Q Long, S Xiao, X F Yu, Y L Gao, J He
Understanding the photoexcited carrier-relaxation actions in ultrasmall black phosphorus quantum dots (BPQDs) will play a crucial role in the fields of electronics and optoelectronics. Herein, we report the ultraviolet (UV) saturable absorption and ultrafast photoexcited carrier-relaxation dynamics of BPQDs. The ultrasmall BPQDs are synthesized using a facile liquid-exfoliation method and possess a diameter of 3.8 ± 0.6 nm and a thickness of 1.5 ± 0.4 nm. Femtosecond open-aperture (OA) Z-scan measurements showed typical saturable absorption properties in the UV band...
February 2, 2017: Nanoscale
https://www.readbyqxmd.com/read/28145723/ultrasmall-silica-based-bismuth-gadolinium-nanoparticles-for-dual-magnetic-resonance-computed-tomography-image-guided-radiation-therapy
#9
Alexandre Detappe, Eloise Thomas, Mark W Tibbitt, Sijumon Kunjachan, Oksana Zavidij, Nishita Parnandi, Elizaveta Reznichenko, François Lux, Olivier Tillement, Ross Berbeco
Selective killing of cancer cells while minimizing damage to healthy tissues is the goal of clinical radiation therapy. This therapeutic ratio can be improved by image-guided radiation delivery and selective radiosensitization of cancer cells. Here, we have designed and tested a novel trimodal theranostic nanoparticle made of bismuth and gadolinium for on-site radiosensitization and image contrast enhancement to improve the efficacy and accuracy of radiation therapy. We demonstrate in vivo magnetic resonance (MR), computed tomography (CT) contrast enhancement, and tumor suppression with prolonged survival in a non-small cell lung carcinoma model during clinical radiation therapy...
February 2, 2017: Nano Letters
https://www.readbyqxmd.com/read/28142312/coherent-light-sources-at-the-nanoscale
#10
Ankun Yang, Danqing Wang, Weijia Wang, Teri W Odom
This review focuses on coherent light sources at the nanoscale, and specifically on lasers exploiting plasmonic cavities that can beat the diffraction limit of light. Conventional lasers exhibit coherent, intense, and directional emission with cavity sizes much larger than their operating wavelength. Plasmon lasers show ultrasmall mode confinement, support strong light-matter interactions, and represent a class of devices with extremely small sizes. We discuss the differences between plasmon lasers and traditional ones, and we highlight advances in directionality and tunability through innovative cavity designs and new materials...
January 30, 2017: Annual Review of Physical Chemistry
https://www.readbyqxmd.com/read/28118505/anatase-tio2-mesocrystals-green-synthesis-in-situ-conversion-to-porous-single-crystals-and-self-doping-ti-3-for-enhanced-visible-light-driven-photocatalytic-removal-of-no
#11
Biying Tan, Xuehao Zhang, Yongjun Li, Hao Chen, Xiaozhou Ye, Yun Wang, Jianfeng Ye
Mesocrystals are of great interest for a wide range of applications owing to their unique structural features and properties. The realization of well-defined metal oxide mesocrystals through a facile and green synthetic approach still remains a great challenge. Here, a novel synthesis strategy is reported for the production of spindle-shaped anatase TiO2 mesocrystals with a single-crystal-like structure, which was simply achieved through the one-step hydrolysis reaction of TiCl3 in the green and recyclable media polyethylene glycol (PEG-400) without any additives...
January 24, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28111943/renal-clearable-ag-nanodots-for-in-vivo-ct-imaging-and-photothermal-therapy
#12
Yanyan Cui, Jian Yang, Qunfang Zhou, Ping Liang, Yaling Wang, Xueyun Gao, Yongtian Wang
Albumin-stabilized Ag nanodots (ANDs) are prepared by a one-step biomineralisation method. The highly-crystallized nanodots have ultrasmall sizes (approximately 5.8 nm) and robust X-ray attenuation (5.7313 HU per mM Ag). The unlabeled ANDs are directly excreted from the body via the urine after in vivo X-ray computer tomography (CT) imaging application. ANDs could be used as CT imaging agents and effective photothermal therapy agents. The tumor growth inhibition reaches 90.2% after photothermal treatment with ANDs...
January 23, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28106214/copper-nanoparticle-interspersed-mos2-nanoflowers-with-enhanced-efficiency-for-co2-electrochemical-reduction-to-fuel
#13
Guodong Shi, Luo Yu, Xin Ba, Xiaoshu Zhang, Jianqing Zhou, Ying Yu
Electrocatalytic conversion of carbon dioxide (CO2) has been considered as an ideal method to simultaneously solve the energy crisis and environmental issue around the world. In this work, ultrasmall Cu nanoparticle interspersed flower-like MoS2 was successfully fabricated via a facile microwave hydrothermal method. The designed optimal hierarchical Cu/MoS2 composite not only exhibited remarkably enhanced electronic conductivity and specific surface area but also possessed improved CO2 adsorption capacity, resulting in a significant increase in overall faradaic efficiency and a 7-fold augmentation of the faradaic efficiency of CH4 in comparison with bare MoS2...
January 20, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28092434/3d-probed-lipid-dynamics-in-small-unilamellar-vesicles
#14
Meng-Hsuan Chao, Yen-Ting Lin, Namasivayam Dhenadhayalan, Hsin-Lung Lee, Hsin-Yen Lee, King-Chuen Lin
Single-molecule fluorescence correlation spectroscopy overcomes the resolution barrier of optical microscopy (10≈-20 nm) and is utilized to look into lipid dynamics in small unilamellar vesicles (SUVs; diameter < 100 nm). The fluorescence trajectories of lipid-like tracer 1,1'-dioctadecyl-3,3,3',3'-tetramethylindodicarbocyanine (DiD) in the membrane bilayers are acquired at a single-molecule level. The autocorrelation analysis yields the kinetic information on lipid organization, oxygen transport, and lateral diffusion in SUVs' membrane...
January 16, 2017: Small
https://www.readbyqxmd.com/read/28089325/ecology-of-the-oral-microbiome-beyond-bacteria
#15
REVIEW
Jonathon L Baker, Batbileg Bor, Melissa Agnello, Wenyuan Shi, Xuesong He
Although great strides have been made in understanding the complex bacterial community inhabiting the human oral cavity, for a variety of (mainly technical) reasons the ecological contributions of oral fungi, viruses, phages, and the candidate phyla radiation (CPR) group of ultrasmall bacteria have remained understudied. Several recent reports have illustrated the diversity and importance of these organisms in the oral cavity, while TM7x and Candida albicans have served as crucial paradigms for CPR species and oral fungi, respectively...
January 11, 2017: Trends in Microbiology
https://www.readbyqxmd.com/read/28071650/improved-ethanol-electrooxidation-performance-by-shortening-pd-ni-active-site-distance-in-pd-ni-p-nanocatalysts
#16
Lin Chen, Lilin Lu, Hengli Zhu, Yueguang Chen, Yu Huang, Yadong Li, Leyu Wang
Incorporating oxophilic metals into noble metal-based catalysts represents an emerging strategy to improve the catalytic performance of electrocatalysts in fuel cells. However, effects of the distance between the noble metal and oxophilic metal active sites on the catalytic performance have rarely been investigated. Herein, we report on ultrasmall (∼5 nm) Pd-Ni-P ternary nanoparticles for ethanol electrooxidation. The activity is improved up to 4.95 A per mgPd, which is 6.88 times higher than commercial Pd/C (0...
January 10, 2017: Nature Communications
https://www.readbyqxmd.com/read/28070850/zolendronic-acid-conjugated-plga-ultrasmall-nanoparticle-loaded-with-methotrexate-as-a-supercarrier-for-bone-targeted-drug-delivery
#17
Vinay Raichur, Kusum Devi Vemula, Naini Bhadri, Rema Razdan
Drug delivery to deep-seated tissues such as bone has been a major complication till date. This preferential drug delivery is further important in targeting anti-tumour agents to bone metastasis owing to its complexity. The present study involves the formulation of PLGA nanoparticles and conjugation with zolendronic acid-a bisphosphonate which will anchor the nanosystem to bone due to its selective bone affinity. The conjugated nanosystem was characterized for particle size by TEM (average 36 nm) and morphology by AFM depicting surface irregularities due to ZOL conjugation on the surface of nanoparticles...
January 9, 2017: AAPS PharmSciTech
https://www.readbyqxmd.com/read/28067960/3d-ordered-macroporous-mos2-c-nanostructure-for-flexible-li-ion-batteries
#18
Zongnan Deng, Hao Jiang, Yanjie Hu, Yu Liu, Ling Zhang, Honglai Liu, Chunzhong Li
A flexible and robust electrode is demonstrated by assembling the 3D ordered macroporous MoS2 @C nanostructure on carbon cloth with ultrasmall few-layered MoS2 nanosheets homogenously embedded into the interconnected carbon wall. Such unique nanostructures are favorable for enhancing lithium storage capacity, directly applied as flexible electrode, demonstrating a very high electrochemical performance and superior cycling stability for lithium ion batteries.
January 9, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28051873/synergistically-improving-the-activity-antipoisonous-ability-and-long-term-stability-of-pt-to-methanol-oxidation-through-developing-favorable-graphene-based-supports
#19
Qiong Xue, Jin-Kuo Li, Zhi-Yong Yang
An interconnected framework of reduced graphene oxide/phenyl formaldehyde polymer composites was synthesized by a one-pot hydrothermal reaction followed by carbonizing under different conditions. Then, the obtained porous materials with varied surface properties were used to disperse ultrasmall Pt nanoparticles. The catalyst with the optimized support demonstrates superior achievements to methanol oxidation reaction (MOR): distinctive improved mass activity (MA) and specific activity at both forward peak position and at the potential range near the operation of fuel cells, best antipoisonous ability revealed by 17 times MA and 7 times the retaining rate of commercial Pt/C in chronoamperometric evaluations, and outstanding long-term stability verified by 3-4 times MA and the retaining rate of Pt/C in the accelerated duration tests...
January 18, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28032953/ultrasmall-yig-nanoparticles-with-high-coercivity-at-low-temperature-synthesized-by-laser-ablation-and-fragmentation-of-pressed-powders
#20
Tim Schmitz, Ulf Wiedwald, Carsten Dubs, Bilal Gökce
Pulsed laser ablation of pressed yttrium-ion-garnet powders in water is studied and compared to the ablation of a single crystal target. We find that target porosity is a crucial factor which has far-reaching implications on nanoparticle productivity. Although nanoparticle size distributions obtained by analytical disc centrifugation and transmission electron microscopy (TEM) are in agreement, X-ray diffraction and energy dispersive X-ray analysis show that only nanoparticles obtained from targets with densities close to that of a bulk target lead to comparable properties...
December 29, 2016: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
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