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Dong Hee Kang, Na Kyong Kim, Hyun Wook Kang
Zinc oxide is one of the versatile semiconductor materials and its use is expanding into photoelectric applications. Anisotropic growth characteristics of zinc oxide are advantageous in growing a nanowire structure. A zinc oxide nanowire based sensor exhibits enhanced performance in terms of detecting gas-phase chemicals due to its large specific surface area. Recent studies have focused on improving performance parameters including sensitivity, efficiency, and stability. A nanostructured thin film exhibits advantages in electron movement in a specific direction due to the electron confinement effect...
May 17, 2019: Nanotechnology
Chao Li, Yijie Liu, Bojie Li, Fan Zhang, Zhu Cheng, Ping He, Haoshen Zhou
All-solid-state Li-O2 batteries are receiving intense interests because of the substitution of solid electrolytes for toxic and flammable liquid electrolytes. However, new issues arise in the aspect of electrolyte-cathode interface. On one hand, in traditional sandwiched battery structure, the reaction sites of cathode are restricted to finite planar electrode-electrolyte interface, resulting in limited performances of all-solid-state Li-O2 batteries. On the other hand, integrating electrolyte with cathode to achieve good interfacial contact often needs complex sintering processes...
May 17, 2019: Nanotechnology
Yunsung Kang, Soonjae Pyo, Eunhwan Jo, Jongbaeg Kim
Two-dimensional (2D) nanomaterials have been extensively explored as promising candidates for gas sensing due to their high surface-to-volume ratio. Among many 2D nanomaterials, molybdenum disulfide (MoS2) is known to be functional in detecting harmful gases at room temperature; therefore, it has been actively studied as a gas-sensing material. However, there has been a limitation in recovering the original signal from reacted MoS2 after exposure to the target gas. This work demonstrates the recovery of the initial resistance of reacted chemical vapor deposition (CVD)-grown MoS2 by illuminating it with a UV light-emitting diode (LED)...
May 17, 2019: Nanotechnology
Hongjin Fu, Xiaolin Zhao, Wei-Tao Lu, Hongyu Tian, Shuqiong Xu, Yunfang Li
Helical nanomaterials represent an emerging group of nanostructures because of their multiple functionalities enabled by unique spiral geometry and nanoscale dimension. This study demonstrates that several trans-transoid polyacetylene (Tt-PA) chains can self-spiral limitlessly over the whole length of polymers to form regular multiple helices under the inducement of water cluster, fullerene ball and metallic nanoparticles (NPs). Multi-helices possess random chirality selection which have equal probability of left-handedness and right-handedness...
May 17, 2019: Nanotechnology
Xinyan Hu, Gang Li, Pengli Zhu, Jiaoning Tang, Rong Sun, Chingping Wong
The inherent susceptibility to oxidation and poor sinterability significantly limit the practical application of Cu-based conductive inks. Most methodologies employed for the inks like organic polymer coatings and inorganic metal deposition are generally ineffective. Herein, we report the design of a novel hierarchical Cu architecture to simultaneously improve the antioxidative and sinterability via a self-passivation mechanism and loose interior structures. The hierarchical Cu architecture was prepared using copper hydroxide, L-ascorbic acid, and polyvinylpyrrolidone in aqueous solution; 40 g Cu were prepared in a scale-up experiment...
May 17, 2019: Nanotechnology
Xu Zhang, I-Te Chen, Chih-Hao Chang
The advance of nanotechnology is firmly rooted in the development of cost-effective, versatile, and easily accessible nanofabrication techniques. The ability to pattern complex two-dimensional and three-dimensional nanostructured materials are particularly desirable, since they can have novel physical properties that are not found in bulk materials. This review article will report recent progress in utilizing self-assembly of colloidal particles for nanolithography. In these techniques, the near-field interactions of light and colloids are the sole mechanisms employed to generate the intensity distribution for patterning...
May 17, 2019: Nanotechnology
Rangana A L Perera Jayawickramage, Kenneth Balkus, John P Ferraris
Lignin was blended with polyacrylonitrile (PAN) in different ratios and fabricated into carbon nanofiber electrodes by electrospinning followed by thermal stabilization, carbonization and subsequent activation by CO<sub>2</sub> of the carbonized mats. These carbon fiber electrodes exhibit high surface area, high mesoporosity, high graphitic content and high electrical conductivity. Activated carbon nanofiber (ACNF) mats derived from PAN:Lignin 70:30 blends display a surface area of 2370 m<sup>2</sup>g<sup>-1</sup>with 0...
May 17, 2019: Nanotechnology
Xinye Chen, Luke Falzon, Jie Zhang, Xiaohui Zhang, Ruo-Qian Wang, Ke Du
Deformable microfluidics may be potentially used in cell manipulation, optical sensing, and imaging applications, and have drawn considerable scientific interests in the recent past. The excellent tunability of deformable microfluidic devices can provide controllable capture, deposition, and target release. We demonstrated a one-dimensional nano-sieve device to capture microparticles from suspensions. Size-selective capturing and release of micro- and nanoparticles was achieved by simply adjusting the flow rate...
May 17, 2019: Nanotechnology
Kailiang Huang, Miao Zhao, Xueyuan Liu, Qingzhen Xia, Honggang Liu
The interface of the two-dimensional material plays a crucial role in the properties of the material itself. When 2D materials are used as channel for electrical devices, negative influence from surface contaminations during fabrication process should be avoided to ensure the device performance and the reliability. In this article, the impacts as well as its mechanisms of interface contaminations on MoS2 field effect transistors were studied. An effective method using an atomic layer deposition (ALD) grown Al2O3 dielectric layer to reduce exposure time of MoS2 during processing was introduced...
May 16, 2019: Nanotechnology
Oscar Ernesto S Ernesto Casanova Carvajal, Ana Lorena Urbano Bojorge, Milagros Ramos, José Javier Serrano Olmedo, Ricardo Martinez-Murillo
Metallic nanorods are promising agents for a wide range of biomedical applications. We report an optical hyperthermia method capable of inducing slowdown tumor progression of an experimental in vivo CT-2A glioblastoma tumor. The tumor model used in this research is based on the transplantation of mouse astrocytoma CT-2A cells in the striatum of mice by intracranial stereotaxic surgery. Two weeks after cell implant, the resulting tumor is treated by irradiating intratumoral injected gold nanorods, biofunctionalized with CD133 antibody (B-GNRs), using a continuous wave laser...
May 13, 2019: Nanotechnology
WenQi Wu, JunJie Yao, ShuYuan Liu, Liang Zhao, Li Xu, YingHui Sun, YanHui Lou, Jie Zhao, Jin-Ho Choi, Lin Jiang, Haibo Wang, Guifu Zou
We report oxygen-vacancies (OVs) rich hexagonal ReO3 nanostructured electrocatalysts for efficient hydrogen generation. Through a simple argon plasma exposure, OVs are introduced into the ReO3 nanoparticles and nanosheets to enhance electrocatalytic activities with decreasing overpotentails from 157 mV and 178 mV to 138 mV and 145 mV at the current density of 10 mA cm-2, respectively. As-processed OVs rich ReO3 nanoparticles exhibit a good stability during electrochemical measurements for 20 h in acidic electrolyte...
May 13, 2019: Nanotechnology
Penglai Guo, Xiaohui Li, Tong Chai, Tianci Feng, Yanqi Ge, Yufeng Song, Yingwei Wang
The ultrafast photonics of different conventional two dimensional (2-D) materials have been studied intensively. Few-layer structure bismuthene has been reported as a new type 2-D material with high efficient electronic, strong mechanics, and outstanding photonics properties. In this paper, a robust ultrafast pulse generation in communications-Band (C-Band) based on few-layer bismuthene has been reported for the first time to the best of our knowledge. The characteristics and the ultrafast optical nonlinear properties of few-layer bismuthene have been investigated experimentally...
May 13, 2019: Nanotechnology
Yusheng Zhai, Guangdian Chen, Jitao Ji, Ma Xiangyu, Zhipeng Wu, Yupei Li, Qilong Wang
Performance of plamson induced hot electrons based photodetectors largely relies on the photon absorption capability. To improve the optical absorption, many perfect absorbers based on the periodic metallic nanostructures have been designed and fabricated through low-throughput, costly and time-consuming lithographic processes, which seriously limit the future potential applications of plasmonic hot-electron optoelectronics devices. Here, a large-scale, broadband absorber consisting of ITO film, ZnO layer, Au film and Al nanospike arrays substrate was designed and fabricated for hot electrons based photodetection...
May 13, 2019: Nanotechnology
Takashi Yatsui, Yusuke Nakahira, Yuki Nakamura, Tatsuki Morimoto, Yuma Kato, Muneaki Yamamoto, Tomoko Yoshida, Kenji Iida, Katsuyuki Nobusada
In many applications such as CO<sub>2</sub> reduction and water splitting, high-energy photons in the ultraviolet region are required to complete the chemical reactions. However, to realize sustainable development, the photon energies utilized must be lower than the absorption edge of the materials including the metal complex for CO<sub>2</sub> reduction, the electrodes for water splitting, because of the huge amount of lower energy than the visible region received from the sun...
May 9, 2019: Nanotechnology
Guy Zuber, Etienne Weiss, Manuela Chiper
The latest advances concerning ultra-small gold nanoparticles (≤ 2 nm) commonly known as gold nanoclusters (AuNCs) are reviewed and discussed in the context of biological and biomedical applications (labeling, delivery, imaging and therapy). A great diversity of synthetic methods has been developed and optimized aiming to improve the chemical structures and physico-chemical properties of the resulting AuNCs. The main synthetic approaches were surveyed with emphasis on methods leading to water-soluble AuNCs since aqueous solutions are the preferred media for biological applications...
May 9, 2019: Nanotechnology
Keju Zhang, Dong Zhou, Zhiguo Wang, Yuhong Zhang, Peixin He
The synthesis of drug delivery systems based on surface-modified mesoporous silica hollow structures remains a huge challenge. In this paper, we have obtained hollow mesoporous silica nanoparticles (MSNs) by surfactant directed sol-gel assisted hydrothermal treatment. The MSNs have the inorganic-organic hybrid frameworks with uniform diameter distribution (260 nm), and their specific surface area, mesoporous size and pore volume are 540 m2/g, 3.7 nm, 0.58 cm3/g, respectively. It was proved that the preparation of hollow ethane-bridged nanospheres with two silicon source was due to the high cross-linking of the silicone interface and hydrothermal treatment, providing a new approach for the study of drug loaded and controlled release behavior...
May 9, 2019: Nanotechnology
Stefan Slesazeck, Thomas Mikolajick
In this review the different concepts of nanoscale resistive switching memory devices are described and classified according to their I-V behaviour and the underlying physical switching mechanisms. By means of the most important representative devices, the current state of electrical performance characteristics is illuminated in-depth. Moreover, the ability of resistive switching devices to be integrated into state-of-the-art CMOS circuits under the additional consideration with a suitable selector device for memory array operation is assessed...
May 9, 2019: Nanotechnology
Rafael Zarzuela, María Carbú, Maria Luisa Almoraima Gil, Jesus Manuel Cantoral, Maria Jesus Mosquera
The alarming increase of pollution has significantly increased buildings maintenance. Nowadays, the economic figures associated to repairing activities are even more relevant than those corresponding to new construction works, especially on heritage buildings. Since the degradation of building materials is the result of a complex combination of physical, chemical and biological agents, the development of multifunctional protective treatments remains a significant challenge. 
 We report a simple strategy to produce a versatile biocidal/ superhydrophobic/consolidant treatment by incorporating biocidal Ag nanoparticles (AgNPs) grafted to functionalized SiO2NPs into a silica sol, which can be applied by simple procedures such as spraying or brushing...
May 8, 2019: Nanotechnology
Nandimalla Vishnu, Parikshit Sahatiya, Chang Yi Kong, Sushmee Badhulika
There is an urgent need to develop low cost electrochemical sensors wherein the sensor can be disposed after recording data thereby eliminating the issue of inaccuracy arising from repeated sensing measurements, which plagues most conventional electrochemical sensors. This work is the first demonstration of a NiSe2 based disposable, one time use electrochemical glucose sensor in bio mimicking real samples wherein NiSe2 was hydrothermally grown NiSe2 on a biodegradable cellulose paper. Both physicochemical (X-ray diffraction, X-ray photoelectron spectroscopy, Field emission scanning electron microscope) and electrochemical (impedance spectroscopy and cyclic voltammetry (CV)) characterization techniques confirmed the growth and presence of NiSe2 on a cellulose paper...
May 8, 2019: Nanotechnology
Mengmeng Gao, Xiang Lin, Zhenghua Li, Xiaoxia Wang, Yebing Qiao, Haiyan Zhao, Jing Zhang, Li Wang
A highly sensitive and uniform three-dimensional (3D) SERS substrate has been fabricated by in situ ultraviolet (UV) Ozone cleaning and layer-by-layer self-assembly. The SERS properties and the structural changes of the substrates were systematically studied by adjusting the cleaning time upon the in situ and post cleaning strategy. Under the optimal cleaning condition, the cleaning technology could give rise to clean and optimal surfaces for SERS analysis, thus obtaining efficient plasmonic films populated with a large number of homogeneous "hot-spots"...
May 8, 2019: Nanotechnology
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