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https://www.readbyqxmd.com/read/28926681/self-powered-ultraviolet-photodetectors-driven-by-built-in-electric-field
#1
REVIEW
Longxing Su, Wei Yang, Jian Cai, Hongyu Chen, Xiaosheng Fang
Self-powered ultraviolet (UV) photodetectors, which have vast applications in the military and for civilian purposes, have become particularly attractive in recent years due to their advantages of high sensitivity, ultrasmall size, and low power consumption. In particular, self-powered UV photodetectors driven by a built-in electric field cannot only detect UV signals but also be powered by the incident signals instead of external power. In this concept, the key issues and most recent developments on photovoltaic type UV photodetectors driven by p-n homojunction, heterojunction, and Schottky junction are surveyed...
September 19, 2017: Small
https://www.readbyqxmd.com/read/28920609/high-performance-capacitive-deionization-electrodes-based-on-ultrathin-nitrogen-doped-carbon-graphene-nano-sandwiches
#2
Miao Wang, Xingtao Xu, Jing Tang, Shujin Hou, Md Shahriar A Hossain, Likun Pan, Yusuke Yamauchi
Here, ultrathin nitrogen-doped carbon/graphene nano-sandwiches were synthesized by carbonization of graphene oxide-based nanosheets, which were fully covered with ultrasmall ZIF-8 nanocrystals. The novel sandwich structure possesses large accessible surface area, excellent electrical conductivity, and high nitrogen content, thus showing superior desalination performance.
September 18, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28920122/survival-of-verwey-transition-in-gadolinium-doped-ultrasmall-magnetite-nanoparticles
#3
Sunmog Yeo, Hyunkyung Choi, Chul Sung Kim, Gyeong Tae Lee, Jeong Hyun Seo, Hyung Joon Cha, Jeong Chan Park
We have demonstrated that the Verwey transition, which is highly sensitive to impurities, survives in anisotropic Gd-doped magnetite nanoparticles. Transmission electron microscopy analysis shows that the nanoparticles are uniformly distributed. X-ray photoelectron spectroscopy and EDS mapping analysis confirm Gd-doping on the nanoparticles. The Verwey transition of the Gd-doped magnetite nanoparticles is robust and the temperature dependence of the magnetic moment (zero field cooling and field cooling) shows the same behaviour as that of the Verwey transition in bulk magnetite, at a lower transition temperature (∼110 K)...
September 18, 2017: Nanoscale
https://www.readbyqxmd.com/read/28904843/synthesis-and-functionalization-of-nagdf4-yb-er-nagdf4-core-shell-nanoparticles-for-possible-application-as-multimodal-contrast-agents
#4
Dovile Baziulyte-Paulaviciene, Vitalijus Karabanovas, Marius Stasys, Greta Jarockyte, Vilius Poderys, Simas Sakirzanovas, Ricardas Rotomskis
Upconverting nanoparticles (UCNPs) are promising, new imaging probes capable of serving as multimodal contrast agents. In this study, monodisperse and ultrasmall core and core-shell UCNPs were synthesized via a thermal decomposition method. Furthermore, it was shown that the epitaxial growth of a NaGdF4 optical inert layer covering the NaGdF4:Yb,Er core effectively minimizes surface quenching due to the spatial isolation of the core from the surroundings. The mean diameter of the synthesized core and core-shell nanoparticles was ≈8 and ≈16 nm, respectively...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/28899089/highly-active-multimetallic-palladium-nanoalloys-embedded-in-conducting-polymer-as-anode-catalyst-for-electrooxidation-of-ethanol
#5
Srabanti Ghosh, Susmita Bera, Sandip Bysakh, Rajendra Nath Basu
Fabrication of multimetallic nanocatalysts with controllable composition remains a challenge for the development of low-cost electrocatalysts and incorporating metal-based catalysts into active carbon nanoarchitecture represents an emerging strategy to improve the catalytic performance of electrocatalysts. Herein, a facile method developed for Pd nanoparticles (NPs) based multimetallic alloys incorporated on polypyrrole (Ppy) nanofibers by in situ nucleation and growth of NPs using colloidal radiolytic technique...
September 13, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28898464/functionalized-ultrasmall-fluorinated-graphene-with-high-nir-absorbance-for-controlled-delivery-of-mixed-anticancer-drugs
#6
Peiwei Gong, Qiao Zhao, Dujuan Dai, Shumiao Zhang, Zhenzhen Tian, Lu Sun, Jiashuo Ren, Zhe Liu
Fluorinated graphene (FG) possess distinctively novel properties different from graphene and is suitable for many biomedical applications. However, the hydrophobic nature and inert property of FG are limiting its further application as biological materials. Here we show the preparation of nanosized FG (60 nm) that exhibits high NIR absorbance for photothermal therapy. In order to make it stable in physiological solutions, FG is enriched with oxygen and followed by covalent binding with chitosan as a novel pH-responsive nanocarrier...
September 12, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28886212/comparison-of-gadolinium-nanoparticles-and-molecular-contrast-agents-for-radiation-therapy-enhancement
#7
Rachel Delorme, Florence Taupin, Mélanie Flaender, Jean-Luc Ravanat, Christophe Champion, Mathieu Agelou, Hélène Elleaume
PURPOSE: Nanoparticles appear as a novel tool to enhance the effectiveness of radiotherapy in cancer treatments. Many parameters influence their efficacy, such as their size, concentration, composition, their cellular localization, as well as the photon source energy. The current Monte Carlo study aims at comparing the dose-enhancement in presence of gadolinium (Gd), either as isolated atoms or atoms clustered in nanoparticles (NPs), by investigating the role played by these physical parameters at the cellular and the nanometer scale...
September 8, 2017: Medical Physics
https://www.readbyqxmd.com/read/28884767/tuning-hexagonal-naybf4-nanocrystals-down-to-sub-10-nm-for-enhanced-photon-upconversion
#8
Ruikai Shi, Xincan Ling, Xiaona Li, Lu Zhang, Min Lu, Xiaoji Xie, Ling Huang, Wei Huang
Enhancing upconversion emission is critical for small-sized lanthanide doped upconversion nanocrystals. A promising way is increasing the doping concentration of excitation energy absorbers, the Yb(3+) sensitizer. However, it is still a challenge to obtain small-sized hexagonal NaLnF4 (Ln: lanthanide) upconversion nanocrystals with a high Yb(3+) concentration due to the fast growth of NaYbF4 crystals, which hinders their applications particularly in biology. We here demonstrate a highly repeatable and controllable method for tuning the size of hexagonal NaYbF4 nanocrystals, down to ∼7 nm, without the assistance of additional impurity doping...
September 8, 2017: Nanoscale
https://www.readbyqxmd.com/read/28861942/cobalt-phosphide-coupled-with-heteroatom-doped-nanocarbon-hybrid-electroctalysts-for-efficient-long-life-rechargeable-zinc-air-batteries
#9
Sung Hoon Ahn, Arumugam Manthiram
Metal phosphides and heteroatom-doped carbons have been regarded as promising candidates as bifunctional catalysts for oxygen evolution reaction (OER) and oxygen reduction reaction (ORR). However, both have suffered from stability issues during repeated ORR and OER operations in zinc-air batteries (ZABs). Herein, this study reports a versatile cobalt-based hybrid catalyst with a 1D structure by integrating the metal-organic framework-derived conversion approach and an in situ crosslinking method. Among them, the 1D hybrid catalyst composed of ultrasmall cobalt phosphide nanoparticles supported by nitrogen-, sulfur-, phosphorus-doped carbon matrix shows remarkable bifunctional activity close to that of the benchmark precious-metal catalysts along with an excellent durability in the full potential range covering both the OER and ORR...
September 1, 2017: Small
https://www.readbyqxmd.com/read/28853861/renal-clearable-ultrasmall-coordination-polymer-nanodots-for-chelator-free-64-cu-labeling-and-imaging-guided-enhanced-radiotherapy-of-cancer
#10
Sida Shen, Dawei Jiang, Liang Cheng, Yu Chao, Kaiqi Nie, Ziliang Dong, Christopher J Kutyreff, Jonathan W Engle, Peng Huang, Weibo Cai, Zhuang Liu
Developing tumor-homing nanoparticles with integrated diagnostic and therapeutic functions, and meanwhile could be rapidly excreted from the body, would be of great interest to realize imaging-guided precision treatment of cancer. In this study, an ultrasmall coordination polymer nanodot (CPN) based on the coordination between tungsten ions (W(VI)) and gallic acid (W-GA) was developed via a simple method. After polyethylene glycol (PEG) modification, PEGylated W-GA (W-GA-PEG) CPNs with an ultrasmall hydrodynamic diameter of 5 nm were rather stable in various physiological solutions...
September 5, 2017: ACS Nano
https://www.readbyqxmd.com/read/28842577/tumor-selective-catalytic-nanomedicine-by-nanocatalyst-delivery
#11
Minfeng Huo, Liying Wang, Yu Chen, Jianlin Shi
Tumor cells metabolize in distinct pathways compared with most normal tissue cells. The resulting tumor microenvironment would provide characteristic physiochemical conditions for selective tumor modalities. Here we introduce a concept of sequential catalytic nanomedicine for efficient tumor therapy by designing and delivering biocompatible nanocatalysts into tumor sites. Natural glucose oxidase (GOD, enzyme catalyst) and ultrasmall Fe3O4 nanoparticles (inorganic nanozyme, Fenton reaction catalyst) have been integrated into the large pore-sized and biodegradable dendritic silica nanoparticles to fabricate the sequential nanocatalyst...
August 25, 2017: Nature Communications
https://www.readbyqxmd.com/read/28833612/a-1d-vanadium-dioxide-nanochannel-constructed-via-electric-field-induced-ion-transport-and-its-superior-metal-insulator-transition
#12
Wuhong Xue, Gang Liu, Zhicheng Zhong, Yuehua Dai, Jie Shang, Yiwei Liu, Huali Yang, Xiaohui Yi, Hongwei Tan, Liang Pan, Shuang Gao, Jun Ding, Xiao-Hong Xu, Run-Wei Li
Nanoscale manipulation of materials' physicochemical properties offers distinguished possibility to the development of novel electronic devices with ultrasmall dimension, fast operation speed, and low energy consumption characteristics. This is especially important as the present semiconductor manufacturing technique is approaching the end of miniaturization campaign in the near future. Here, a superior metal-insulator transition (MIT) of a 1D VO2 nanochannel constructed through an electric-field-induced oxygen ion migration process in V2 O5 thin film is reported for the first time...
August 21, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28819665/efficient-photoelectrochemical-water-splitting-on-ultrasmall-defect-rich-taox-nanoclusters-enhanced-by-size-selected-pt-nanocluster-promoters
#13
Saurabh Srivastava, Joseph Palathinkal Thomas, Nina Heinig, Marwa Abd-Ellah, Md Anisur Rahman, Kam Tong Leung
Formation of nanoclusters has attracted a lot of attention in recent years because of their distinct properties from isolated atoms and bulk solids. Here, we focus on the catalytic properties of supported transition metal oxide nanoclusters, such as TaO2, with a well-defined size distribution below 10 nm. We show that their catalytic performance can be greatly enhanced by introducing a reaction promoter such as Pt. Different combinations of precisely size-selected, defect-rich TaOx and Pt nanoclusters are produced by a gas-phase aggregation technique in a special DC magnetron sputtering system...
August 18, 2017: Nanoscale
https://www.readbyqxmd.com/read/28809881/genetic-algorithm-optimized-wideband-on-chip-polarization-rotator-with-an-ultrasmall-footprint
#14
Zejie Yu, Haoran Cui, Xiankai Sun
Polarization control of light waves is an important technique in optical communication and signal processing. On-chip polarization rotation from the fundamental transverse-electric (TE00) mode to the fundamental transverse-magnetic (TM00) mode is usually difficult because of their large effective refractive index difference. Here, we demonstrate an on-chip wideband polarization rotator designed with a genetic algorithm to convert the TE00 mode into the TM00 mode within a footprint of 0.96 μm ×4.2  μm...
August 15, 2017: Optics Letters
https://www.readbyqxmd.com/read/28808955/exploring-the-biological-and-mechanical-properties-of-abdominal-aortic-aneurysms-using-uspio-mri-and-peak-tissue-stress-a-combined-clinical-and-finite-element-study
#15
Noel Conlisk, Rachael O Forsythe, Lyam Hollis, Barry J Doyle, Olivia M B McBride, Jennifer M J Robson, Chengjia Wang, Calum D Gray, Scott I K Semple, Tom MacGillivray, Edwin J R van Beek, David E Newby, Peter R Hoskins
Inflammation detected through the uptake of ultrasmall superparamagnetic particles of iron oxide (USPIO) on magnetic resonance imaging (MRI) and finite element (FE) modelling of tissue stress both hold potential in the assessment of abdominal aortic aneurysm (AAA) rupture risk. This study aimed to examine the spatial relationship between these two biomarkers. Patients (n = 50) > 40 years with AAA maximum diameters > = 40 mm underwent USPIO-enhanced MRI and computed tomography angiogram (CTA). USPIO uptake was compared with wall stress predictions from CTA-based patient-specific FE models of each aneurysm...
August 14, 2017: Journal of Cardiovascular Translational Research
https://www.readbyqxmd.com/read/28806068/in-situ-atomic-scale-studies-of-the-formation-of-epitaxial-pt-nanocrystals-on-monolayer-molybdenum-disulfide
#16
Shanshan Wang, Hidetaka Sawada, Qu Chen, Grace G D Han, Christopher Allen, Angus I Kirkland, Jamie H Warner
Pt-nanocrystal:MoS2 hybrid materials have promising catalytic properties for hydrogen evolution, and understanding their detailed structures at the atomic scale is crucial to further development. Here, we use an in situ heating holder in an aberration-corrected transmission electron microscope to study the formation of Pt nanocrystals directly on the surface of monolayer MoS2 from a precursor on heating to 800 °C. Isolated single Pt atoms and small nanoclusters are observed after in situ heating, with two types of preferential alignment between the Pt nanocrystals and the underlying monolayer MoS2...
August 14, 2017: ACS Nano
https://www.readbyqxmd.com/read/28801268/positron-emission-tomography-pet-guided-glioblastoma-targeting-by-a-fullerene-based-nanoplatform-with-fast-renal-clearance
#17
Yayun Peng, Dongzhi Yang, Weifei Lu, Xiongwei Hu, Hao Hong, Ting Cai
Various carbonaceous nanomaterials, including fullerene, carbon nanotube, graphene, and carbon dots, have attracted increasing attention during past decades for their potential applications in biological imaging and therapy. In this study, we have developed a fullerene-based tumor-targeted positron emission tomography (PET) imaging probe. Water-soluble functionalized C60 conjugates were radio-labeled with (64)Cu and modified with cyclo (Arg-Gly-Asp) peptides (cRGD) for targeting of integrin αvβ3 in glioblastoma...
August 8, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28783256/fabrication-of-fe3-o4-dots-embedded-in-3d-honeycomb-like-carbon-based-on-metallo-organic-molecule-with-superior-lithium-storage-performance
#18
Chengfei Li, Liuqing Li, Zhaopeng Li, Weihao Zhong, Zhenghui Li, Xiaoqing Yang, Guoqing Zhang, Haiyan Zhang
A novel metallo-organic molecule, ferrocene, is selected as building block to construct Fe3 O4 dots embedded in 3D honeycomb-like carbon (Fe3 O4 dots/3DHC) by using SiO2 nanospheres as template. Unlike previously used inorganic Fe3 O4 sources, ferrocene simultaneously contains organic cyclopentadienyl groups and inorganic Fe atoms, which can be converted to carbon and Fe3 O4 , respectively. Atomic-scale Fe distribution in started building block leads to the formation of ultrasmall Fe3 O4 dots (≈3 nm). In addition, by well controlling the feed amount of ferrocene, Fe3 O4 dots/3DHC with well-defined honeycomb-like meso/macropore structure and ultrathin carbon wall can be obtained...
August 7, 2017: Small
https://www.readbyqxmd.com/read/28782610/anti-connective-tissue-growth-factor-detects-and-reduces-plaque-inflammation-in-early-stage-carotid-atherosclerotic-lesions
#19
Yuyu Yao, Bing Li, Cong Fu, Gaojun Teng, Genshan Ma, Naifeng Liu
This study explored connective tissue growth factor (CTGF)-targeted ultrasmall superparamagnetic iron oxides (USPIOs) for noninvasive MRI of CTGF within carotid atherosclerotic lesions in apoE-deficient (apoE(-/-)) mice. Anti-CTGF polyclonal and nonspecific IgG antibodies were conjugated to polyethylene glycol-coated USPIOs, and apoE(-/-) carotid partial ligation-model mice were imaged via MRI before and after contrast administration. ApoE(-/-) mice were treated with CTGF-neutralizing antibodies for 3 weeks...
August 3, 2017: Nanomedicine: Nanotechnology, Biology, and Medicine
https://www.readbyqxmd.com/read/28778031/transformation-from-gold-nanoclusters-to-plasmonic-nanoparticles-a-general-strategy-towards-selective-detection-of-organophosphorothioate-pesticides
#20
Qian Lu, Tingyao Zhou, Yaping Wang, Lingshan Gong, Jinbin Liu
Luminescent gold nanoclusters (AuNCs) synthesized using non-thiolate DNA ligands were reported to show both optical and structure responses toward diethyposphorthioate (DEP) derived from the hydrolysis of chlorpyrifos (CP). After incubation of AuNCs with DEP, the non-thiolate DNA ligands were immediately replaced and the tiny AuNCs with ultrasmall size transformed gradually to plasmonic nanoparticles, which resulted in significant luminescence quenching of the AuNCs, offering a new possibility to selectively detect organophosphorothioate pesticides that could be easily hydrolyzed to form the special structures such as DEP containing two binding sites (e...
July 29, 2017: Biosensors & Bioelectronics
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