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Nanotechnology

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https://www.readbyqxmd.com/read/28937361/multiplex-detection-of-pancreatic-cancer-biomarkers-using-a-sers-based-immunoassay
#1
Nariman Banaei, Anne Foley, Jean Marie Houghton, Yubing Sun, Byung Kim
Early diagnosis of pancreatic cancer is critical to reduce the mortality rate of this disease. Current biological analysis approaches cannot robustly detect several low abundance pancreatic cancer biomarkers in sera, limiting the clinical application of these biomarkers. This study demonstrates a novel system for multiplex detection of pancreatic biomarkers CA19-9, MMP7 and MUC4 in sera samples with high sensitivity. Measuring the levels of these biomarkers in pancreatic cancer patients, pancreatitis patients, and healthy individuals reveals the unique expression pattern of these markers in pancreatic cancer patients, suggesting the great potential of using this approach for early diagnostics of pancreatic cancers...
September 22, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28936987/characterization-of-highly-crystalline-lead-iodide-nanosheets-prepared-by-room-temperature-solution-processing
#2
Riccardo Frisenda, Joshua O Island, Jose Lado, Emerson Giovanelli, Patricia Gant, Philipp Nagler, Sebastian Bange, John Lupton, Christian Schüller, Aday Molina-Mendoza, Lucia Aballe, Michael Foerster, Tobias Korn, Miguel A Nino, David Perez de Lara, Emilio M Perez, Joaquin Fernandez-Rossier, Andres Castellanos-Gomez
Two-dimensional semiconducting materials are particularly appealing for many applications. Although theory predicts a large number of two-dimensional materials, experimentally only a few of these materials have been identified and characterized comprehensively in the ultrathin limit. Lead iodide, which belongs to the transition metal halides family and has a direct bandgap in the visible spectrum, has been known for a long time and has been well characterized in its bulk form. Nevertheless, studies of this material in the nanometer thickness regime are rather scarce...
September 22, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28936985/integration-of-multiple-theories-for-the-simulation-of-laser-interference-lithography-processes
#3
Te Hsun Lin, Yin Kuang Yang, Chien-Chung Fu
The periodic structure of laser interference lithography (LIL) fabrication is superior to other lithography technologies. In contrast to traditional lithography, LIL has the advantages of being a simple optical system with no mask requirements, low cost, high depth of focus, and large patterning area in a single exposure. Generally, a simulation pattern for the periodic structure is obtained through optical interference prior to its fabrication through LIL. However, the LIL process is complex and combines the fields of optical and polymer materials; thus, a single simulation theory cannot reflect the real situation...
September 22, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28934099/phase-imaging-and-nanoscale-energy-dissipation-of-supported-graphene-using-amplitude-modulation-atomic-force-microscopy
#4
Borislav Vasic, Aleksandar Matkovic, Rados Gajic
We investigate phase imaging of supported graphene using amplitude modulation atomic force microscopy (AFM), so called, tapping mode. The phase contrast between graphene and neighbouring substrate grows at hard tapping conditions and the contrast is enhanced compared to the topographic one. Therefore, the phase measurements could enable a high contrast imaging of graphene and related two dimensional materials and heterostructures, not achievable with conventional AFM based topographic measurements. Obtained phase maps are then transformed into energy dissipation maps which are important for graphene applications in various mechanical systems...
September 21, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28934098/ultrahigh-performance-heat-spreader-based-on-gas-liquid-exfoliation-boron-nitride-nanosheets
#5
Jiheng Ding, Hongran Zhao, Qiaolei Wang, Wanjun Peng, Haibin Yu
Due to its high thermal conductivity, insulation performance, boron nitride nanosheets (BNNS) have a great promising to fabricate thermal management equipments for application in power electronics. Liquid-phase exfoliation route has been regarded as the most commonly used approach to produce single and few-layered BNNS for many research fileds. However, this process has been slow, and the production yield is extremely low. In this work, an efficient technique to obtain few-layered (mostly < 5 layers), high-yield (~33%), and plane-defect-free BNNS by the combination of liquid N2 (L-N2) gasification and liquid exfoliation was developed...
September 21, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28933706/the-influence-of-atmosphere-on-performance-of-pure-phase-wz-and-zb-inas-nanowire-transistors
#6
Abu Rifat Ullah, Hannah J Joyce, Hoe Tan, Chennupati Jagadish, Adam P Micolich
We compare the characteristics of phase-pure MOCVD grown ZB and WZ InAs nanowire transistors in several atmospheres: air, dry pure N<sub>2</sub> and O<sub>2</sub>, and N<sub>2</sub> bubbled through liquid H<sub>2</sub>O and alcohols to identify whether phase-related structural/surface differences affect their response. Both WZ and ZB give poor gate characteristics in dry state. Adsorption of polar species reduces off-current by 2-3 orders of magnitude, increases on-off ratio and significantly reduces sub-threshold slope...
September 21, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28930102/confirming-the-key-role-of-ar-ion-bombardment-in-growth-feature-of-nanostructured-carbon-materials-by-pecvd
#7
Yulin Liu, Jinghuang Lin, Henan Jia, Shulin Chen, J Qi, Chaoqun Qu, Jian Cao, Jicai Feng, Weidong Fei
In order to confirm the key role of plasma etching in growth feature of nanostructured carbon materials (NCMs), here we reported a novel strategy to in-situ create different states of plasma etching conditions in plasma enhanced chemical vapor deposition (PECVD) by separating catalyst film from substrate. Different plasma-related environments on either side of the catalyst film were created simultaneously for achieving multi-layered structural NCMs. Results showed that plasma etching is observed crucial and complex for the growth of NCMs...
September 20, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28930100/the-joule-heating-problem-in-silver-nanowire-transparent-electrodes
#8
H H Khaligh, L Xu, A Khosropour, A Madeira, M Romano, C Pradére, M Tréguer-Delapierre, L Servant, M A Pope, I A Goldthorpe
Silver nanowire transparent electrodes have shown considerable potential to replace conventional transparent conductive materials. However, in this report we show that Joule heating is a unique and serious problem with these electrodes. When conducting current densities encountered in organic solar cells, the average surface temperature of indium tin oxide (ITO) and silver nanowire electrodes, both with sheet resistances of 60 ohms/square, remains below 35 °C. However, in contrast to ITO, the temperature in the nanowire electrode is very non-uniform, with some localized points reaching temperatures above 250 °C...
September 20, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28930094/effect-of-surface-roughness-chemical-composition-and-native-oxide-crystallinity-on-the-orientation-of-self-assembled-gan-nanowires-on-ti-foils
#9
G Calabrese, S V Pettersen, C Pfüller, M Ramsteiner, J K Grepstad, O Brandt, L Geelhaar, S Fernández-Garrido
We report on plasma-assisted molecular beam epitaxial growth of almost randomly oriented, uniformly tilted, and vertically aligned self-assembled GaN nanowires (NWs), respectively, on different types of polycrystalline Ti foils. The NW orientation with respect to the substrate normal, which is affected by an in situ treatment of the foil surface before NW growth, depends on the crystallinity of the native oxide. Direct growth on the as-received foils results in the formation of ensembles of nearly randomly oriented NWs due to the strong roughening of the surface induced by chemical reactions between the impinging elements and Ti...
September 20, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28925924/in-situ-preparation-of-fe-sub-3-sub-o-sub-4-sub-in-a-carbon-hybrid-of-graphene-nanoscrolls-and-carbon-nanotubes-as-high-performance-anode-material-for-lithium-ion-batteries
#10
Yuewen Liu, Ahmad Hassan Siddique, Heran Huang, Qile Fang, Wei Deng, Xufeng Zhou, Huanming Lu, Z P Liu
A new conductive carbon hybrid combining both graphene nanoscrolls and carbon nanotubes (rGNSs-CNTs) is prepared, and used to host Fe3O4 nanoparticles through an in situ synthesis method. As an anode material for LIBs, the obtained Fe3O4@rGNSs-CNTs shows good electrochemical performance. At a current density of 0.1 A g-1, the anode material shows a high reversible capacity of 1232.9 mAh g-1 after 100 cycles. Even at a current density of 1 A g-1, it still achieves a high reversible capacity of 812.3 mAh g-1 after 200 cycles...
September 19, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28925922/fabricating-tio2-nanocolloids-by-electric-spark-discharge-method-at-normal-temperature-and-pressure
#11
Kuo-Hsiung Tseng, Chaur-Yang Chang, Meng-Yun Chung, Ting-Shou Cheng
In this study, TiO2 nanocolloids were successfully fabricated in deionized water without using suspending agents through using the electric spark discharge method at room temperature and under normal atmospheric pressure. This method was exceptional because it did not create nanoparticle dispersion and the produced colloids contained no derivatives. The proposed method requires only traditional electrical discharge machines (EDMs), self-made magnetic stirrers, and Ti wires (purity, 99.99%). The EDM pulse on time (Ton) and pulse off Time (Toff) were respectively set at 50 and 100 s, 100 and 100 s, 150 and 100 s, and 200 and 100 s to produce four types of TiO2 nanocolloids...
September 19, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28925921/au-pt-nanoparticles-as-catalase-mimics-to-attenuate-tumor-hypoxia-and-enhance-immune-cell-mediated-cytotoxicity
#12
Juan Li, Hong Liang, Ying Wu, Xiang-Yu Ou, Jingying Li
Hypoxic tumor microenvironment (TME) is closely linked to tumor progression, heterogeneity and immune suppression. Therefore, the development of effective methods to overcome hypoxia and substantially enhance the immunotherapy efficacy remains a desirable goal. Herein, we engineered a biocompatible Au core/Pt shell nanoparticles (Au@Pt NPs) to reoxygenate the TME by reacting with endogenous H2O2. Treatment with Au@Pt NPs appeared to improve oxygen in intracellular environments and decrease hypoxia-inducible factor (HIF)-1α expression...
September 19, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28925379/oriented-cuco2s4-nanograss-arrays-ni-foam-as-an-electrode-for-a-high-performance-all-solid-state-supercapacitor
#13
Yuqiao Wang, Dawei Yang, Tianyue Zhou, Jie Pan, Tao Wei, Yueming Sun
An oriented nanograss array consisting of CuCo2S4 nanocrystallines was directly prepared on Ni foam by a hydrothermal method. The uniform arrays with the single blade diameter of ~100 nm and length of ~4 μm can grow tightly on Ni foam without any binders. The ordered one-dimensional structure facilitates the electron transport to Ni substrates along the axial direction. The electrochemical properties were presented in three- and two-electrode configurations, demonstrating an enhanced specific capacitance and a long-term cycling stability...
September 19, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28925378/spectroscopically-forbidden-infra-red-emission-in-au-vertical-graphene-hybrid-nanostructures
#14
A K Sivadasan, Santanu Parida, Subrata Ghosh, Ramanathaswamy Pandian, Sandip Dhara
Implementation of Au nanoparticles (NPs) is a subject for frontier plasmonic research due to its fascinating optical properties. Herein, the present study deals with plasmonic assisted emission properties of Au NPs-vertical graphene (VG) hybrid nanostructures. The influence of effective polarizability of Au NPs on the surface enhanced Raman scattering and luminescence properties is investigated. In addition, a remarkable infra-red (IR) emission in the hybrid nanostructures is observed and interpreted on the basis of intra-band transitions in Au NPs...
September 19, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28925376/quantification-of-nanoparticle-concentration-in-colloidal-suspensions-by-a-non-destructive-optical-method
#15
Sandhya Clement, Brint Gardner, Wan Aizuddin W Razali, Victoria Coleman, Åsa Jämting, Heather Catchpoole, Ewa M Goldys, Jan Herrmann, Andrei V Zvyagin
The estimation of nanoparticle number concentration in colloidal suspensions is a prerequisite in many procedures, and in particular in multi-stage, low-yield reactions. Here, we describe a rapid, non-destructive method based on optical extinction and dynamic light scattering, which combines measurements using common bench-top instrumentation with a numerical algorithm to calculate the particle size distribution and concentration. These quantities were derived from Mie theory applied to measurements of the optical extinction spectrum of homogeneous, non-absorbing nanoparticles, and the relative particle size distribution of a colloidal suspension...
September 19, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28925373/visualization-and-automatic-detection-of-defect-distribution-in-gan-atomic-structure-from-sampling-moir%C3%A3-phase
#16
Qinghua Wang, Shien Ri, Hiroshi Tsuda, Masako Kodera, Kyoichi Suguro, Naoto Miyashita
Quantitative detection of defects in atomic structures is of great significance to evaluating product quality and exploring quality improvement process. In this study, a Fourier transform filtered sampling Moire technique was proposed to visualize and detect defects in atomic arrays in a large field of view. Defect distributions, defect numbers and defect densities could be visually and quantitatively determined from a single atomic structure image at low cost. The effectiveness of the proposed technique was verified from numerical simulations...
September 19, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28925370/controlled-preparation-of-m-ag-au-tio-sub-2-sub-through-sulfydryl-assisted-method-for-enhanced-photocatalysis
#17
Hongbo Xia, Suli Wu, Jiajie Bi, Shufen Zhang
Here a simple and effective method was explored to fabricate M/TiO<sub>2</sub> (M=Ag, Au) composites, which required neither pre-treatment of TiO<sub>2</sub> nor any additives as reducing agent. Using amorphous TiO<sub>2</sub> spheres functionalized with SH groups as starting materials, the noble metallic ions (Ag, Au) can be adsorbed by TiO<sub>2</sub> due to their special affinity with SH groups, which is beneficial to the uniform dispersion of metallic ions on the surface of TiO<sub>2</sub>...
September 19, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28922139/3d-printed-multiplexed-electrospinning-sources-for-large-scale-production-of-aligned-nanofiber-mats-with-small-diameter-spread
#18
Erika García-López, Daniel Olvera-Trejo, Luis F Velásquez-García
We report the design, fabrication, and characterization of novel, low-cost, and modular miniaturized nanofiber electrospinning sources for the scalable production of non-woven aligned nanofiber mats with low diameter variation. The devices are monolithic arrays of electrospinning emitters made via stereolithography; the emitters are arranged so each element has an independent line of sight to a rotating collector surface. Linear and zigzag emitter packing were evaluated using a PEO solution with the aim of maximizing the throughput of nanofibers with the smallest diameter and narrowest distribution...
September 18, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28920581/bottle-brush-shaped-heterostructures-of-nio-zno-nanowires-growth-study-and-sensing-properties
#19
Camilla Baratto, Raj Kumar, Elisabetta Comini, Matteo Ferroni, Marco Campanini
We present here heterostructured ZnO-NiO nanowires, constituted by a core of single crystalline ZnO nanowires, covered by poly-crystalline NiO nanorods. The bottle-brush shape was investigated by SEM and TEM, confirming that a columnar growth of NiO occurred over the ZnO core, with a preferred orientation of NiO over ZnO nanowires. The heterostructured devices are proposed for gas sensing application. Bare ZnO nanowires and heterostructured sensors with two different thicknesses of NiO poly-crystalline nanorods were analysed for acetone, ethanol, NO2 and H2 detection...
September 18, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28920580/sandwiched-zno-au-cds-nanorod-arrays-with-enhanced-visible-light-driven-photocatalytical-performance
#20
Shoutian Ren, Yingying Wang, Guanghua Fan, Renxi Gao, Wenjun Liu
The development of high-performance photocatalysts is central to take advantage of solar energy to overcome environmental and energy crises. Integrating different functional materials artfully into nanostructures can acquire more efficient photocatalytic activity. Here sandwiched ZnO@Au@CdS nanorod films were synthesized via successive ZnO nanorod electrodeposition, Au sputtering and CdS electrodeposition. The as-synthesized composites were characterized by UV-vis spectrophotometer, x-ray diffractometer, scanning and transmission electron microscopy...
September 18, 2017: Nanotechnology
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