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Lilan Peng, Lei Zhang, Jian Yuan, Chen Chen, Qiaoliang Bao, Chengwei Qiu, Kai Zhang, Zeping Peng
Graphene plasmonics, with dynamic tunable resonance wavelength, has been successfully used in broadband plasmon-enhanced infrared spectroscopy. However, the requirement for external voltage loading makes the practical application sophisticated. In this work, the hybrid structure of graphene nanodot array (GNA) and gold nanoparticles (AuNPs) has been proposed as a passive platform for broadband infrared absorption enhancement. Numerical simulations show that the plasmon resonance peak of GNA becomes stiffer and broader when introducing AuNPs, and this is also proved by experimental results that the vibrational modes of PEO molecule in a broad spectral range can be simultaneously enhanced...
May 19, 2017: Nanotechnology
Nadia Vega, Oscar Marin, Ezequiel Tosi, Gustavo Grinblat, Edgar Mosquera, M Moreno, Mónica Tirado, D Comedi
The room temperature photoluminescence (PL) from ZnO/MgO core/shell nanowires (NWs) grown by a simple two-step vapour transport method was studied for various MgO shell widths (w). Two distinct effects induced by the MgO shell were clearly identified. The first one, related to the ZnO/MgO interface formation, is evidenced by strong enhancements of the zero-phonon and first phonon replica of the excitonic emission, which are accompanied by a total suppression of its second phonon replica. This effect can be explained by the reduction of the band bending within the ZnO NW core that follows the removal of atmospheric adsorbates and associated surface traps during the MgO growth process on one hand, and a reduced exciton-phonon coupling as a result of the mechanical stabilization of the outermost ZnO NW monolayers by the MgO shell on the other hand...
May 19, 2017: Nanotechnology
Marialuisa Siepi, Jane Politi, Principia Dardano, Angela Amoresano, Luca De Stefano, Daria Maria Monti, Eugenio Notomista
Fullerenes, allotropic forms of carbon, have very interesting pharmacological effects and engineering applications. However, a very low solubility both in organic solvents and water hinders their use. Fullerene C60, the most studied among fullerenes, can be dissolved in water only in the form of nanoparticles of variable dimensions and limited stability. Here the effect on the production of C60 nanoparticles by native and denatured hen egg white lysozyme, a highly basic protein, has been systematically studied...
May 19, 2017: Nanotechnology
Fei Huang, Zhen Li, Aihua Yan, Hui Zhao, Hao Feng, Yuehua Wang
Coping with the increasing environmental issues, niobium oxyfluoride (Nb3O7F) as a novel semiconductor is a kind of promising photocatalyst due to its outstanding electronic and optoelectrinic properties. However, the photocatalytic performance of Nb3O7F is restricted in practical application due to its weak optical absorption and low carrier separation. In this work, novel Nb3O7F/WS2 hybrid nanocomposites with superior optical absorption and photocatalytic activity have been successfully synthesized by a facile two-step sol-hydrothermal technique...
May 19, 2017: Nanotechnology
Liang Xiao, Wen Meng, Shiyao Wang, Dan Liu, Deyu Qu, Zhizhong Xie, Bohua Deng, Jinping Liu
Understanding the effects of structural properties on the lithium storage behavior of mesoporous TiO2 is crucial for further optimizing its performance through rational structure design. To achieve this, herein, the surface area and the grain size of the prepared mesoporous TiO2 are intentionally adjusted by controlling the calcination temperatures. It is found that the capacities of the mesoporous TiO2 contain both the lithium-ion insertion into the bulk phase (Qin) and the additional surface lithium storage (Qas)...
May 19, 2017: Nanotechnology
Oren Gall, Xiahua Zhong, Daniel Schulman, Myungkoo Kang, Ali Razavieh, Theresa Mayer
Nanosensor arrays have recently received significant attention due to their utility in a wide range of applications, including gas sensing, fuel cells, internet of things (IoT), and portable health monitoring systems. Less attention has been given to the production of sensor platforms in the µW range for ultra-low power applications. Here, we discuss how to scale the nanosensor energy demand by developing a process for integration of nanowire sensing arrays on a monolithic CMOS chip. This work demonstrates an off-chip nanowire fabrication method; subsequently nanowires link to a fused SiO2 substrate using electric-field assisted directed assembly...
May 19, 2017: Nanotechnology
Xinyuan Chong, Ki-Joong Kim, Yujing Zhang, Erwen Li, Paul Ohodnicki, Chih-Hung Chang, Alan Wang
In this letter, we present a nanophotonic device consisting of plasmonic nano-patch array with integrated metal-organic framework (MOF) for enhanced infrared absorption gas sensing. By designing a gold nanopatch array (Au-NPA) on a sapphire substrate, we are able to achieve enhanced optical field that spatially overlaps with the MOF layer, which can adsorb carbon dioxide (CO2) with high capacity. Experimental results show that this hybrid plasmonic-MOF device can effectively increase the infrared absorption path of on-chip gas sensors by more than 1,100-fold...
May 19, 2017: Nanotechnology
Faheng Zang, Sangwook Chu, Konstantinos Gerasopoulos, James Culver, Reza Ghodssi
This paper reports the implementation of temporal capillary microfluidic patterns and biological nanoscaffolds in autonomous microfabrication of nanostructured symmetric electrochemical supercapacitors. A photoresist layer was first patterned on the substrate, forming a capillary microfluidics layer with two separated interdigitated microchannels. Tobacco mosaic virus (TMV) macromolecules suspended in solution are autonomously delivered into the microfluidics, and form a dense bio-nanoscaffolds layer within an hour...
May 19, 2017: Nanotechnology
Mareen Gläske, Manoj Kumar, Timo Bißwanger, Saulius Vaitiekenas, Cesare Soci, Rohit Narula, Annalisa Bruno, Antonio Setaro
Recently, we introduced a novel hybridization route for carbon nanotubes using gold nanoparticles, whose close proximity neatly enhances their radiative emission. Here we investigate the mechanisms behind the enhancement by monitoring the de-excitation dynamics of our π-hybrids through two-color pump-probe time-resolved spectroscopy. The de-excitation process reveals a fast component and a slow component. We find that the presence of gold prominently affects the fast processes, indicating a stronger influence of the gold nanoparticle on the intra-band non-radiative relaxation than on the inter-band recombination of the SWNT...
May 18, 2017: Nanotechnology
Xiaobin Liu, Wenxiu Que, Peng Chen, Yapeng Tian, Jie Liu, Zuoli He, Huanfu Zhou, Ling Bing Kong
Exfoliated hexaniobate nanosheets E-H2K2Nb6O17-x (E-HKNO) with broad light absorption (up to 850 nm) and high adsorption properties were prepared via ion exchange and transient annealing processes with micron-size K4Nb6O17 powders as the precursor. The as-prepared E-HKNO nanosheets show excellent visible light photodegradation performances when compared to degussa P25, which was evaluated in terms of degradation of Rhodamine B (Rh B). High adsorption and broad light absorption characteristics could be attributed to the exfoliation behavior and the reduction of surface Nb(5+) to Nb(4+), which was confirmed by x-ray photoelectron spectroscopy (XPS) and Raman spectra...
May 18, 2017: Nanotechnology
Zhengqi Liu, Houjiao Zhang, Xiaoshan Liu, Pingping Pan, Yi Liu, Li Tang, Guiqiang Liu
Metal films with broadband optical transparency are desirable in many optoelectronic devices, such as displays, smart windows, light-emitting diodes and infrared detectors. As bare metal is opaque to light, this issue of transparency attracts great scientific interest. In this work, we proposed and demonstrated a feasible and universal approach for achieving broadband optical transparent (BOT) metals by utilizing all-dielectric resonant cavities. Resonant dielectrics provide optical cavity modes and couple strongly with the surface plasmons of the metal film, and therefore produce a broadband near-unity optical transparent window...
May 18, 2017: Nanotechnology
L K Lim, B K Ng, C Y Fu, Landobasa Y M Tobing, D H Zhang
Well-ordered periodic nanostructures are excellent substrates for many surface-enhanced Raman spectroscopy (SERS) applications. Conventional fabrication approaches such as high precision electron beam lithography or focused ion beam produce high resolution nano-features with great reproducibility at the expense of low throughput. In this work, a highly sensitive and scalable AAO-nano-fibre (ANF) SERS substrate is demonstrated by optimising the second anodisation time of the standard two-step anodisation of aluminium and performing an additional wet etching step on the resulting AAO substrate...
May 17, 2017: Nanotechnology
Dario Facio, Luis Carrascosa, Maria Jesus Mosquera
Nowadays, producing building surfaces that prevent water and oil uptake and which present self-cleaning activity is still a challenge. In this study, amphiphobic (superhydrophobic and oleophobic) building surfaces were successfully produced. A simple and low-cost process was developed, which is applicable to large-scale building surfaces, according the following procedure: (1) By spraying a SiO2 nanocomposite which produces a closely-packed nanoparticle uniform topography; (2) By functionalizing the previous coating with a fluorinated alkoxysilane, producing high hydrophobicity and oleophobicity...
May 17, 2017: Nanotechnology
Li Niu, Lifang Gao, Shiyu Gan, Hongyan Li, Dongxue Han, Fenghua Li, Yu Bao
Boosting the energy density remains a crucial issue for facilitating applications of capacitive energy storage devices. Herein, we report a graphene-anthraquinone supramolecular nanostructure by self-assembly for supercapacitors. The sulfonated anthraquinone exhibits high water solubility, π-conjugated structure and redox active features, which not only serves as a spacer to interact and stabilize graphene but also introduces extra contribution of pesudocapacitance. The formed nest-like three-dimensional (3D) nanostructure by further hydrothermal treatment enhances the accessibility of ion transfers and exposes the redox-active quinone groups into electrolytes...
May 17, 2017: Nanotechnology
Changcun Li, Fangfang Kong, Congcong Liu, Huixuan Liu, Yongjing Hu, Tongzhou Wang, Jingkun Xu, Fengxing Jiang
The wet-chemical approach is of great significance for the synthesis of two-dimensional (2D) bismuth telluride nanoplatelets as a potential thermoelectric (TE) material. Herein, we proposed a simple and effective solution method with the assistance of aniline for the fabrication of bismuth telluride nanoplatelets at a low temperature of 100 °C. The choice of aniline with its dual function avoided the simultaneous use of a capping regent and a toxic reductant. The as-synthesized nanoplatelets have a large size of more than 900 × 500 nm(2) and a small thickness of 15...
May 17, 2017: Nanotechnology
Søren Simonsen, Jing Shao, Wenjing Zhang
Design of 3-dimensional metal oxide nanofibers by electrospinning is being widely explored. However, the impacts of calcination and sintering on the resulting morphology remain unknown. For the first time, (La<sub>0.6</sub>Sr<sub>0.4</sub>)<sub>0.99</sub>CoO<sub>3-δ</sub> (LSC) nanofiber, which is among the most promising electrode materials for solid oxide fuel cells, was synthesized by sol-gel electrospinning. By elevating the temperature in oxygen using in situ transmission electron microscopy, we discovered the structural transitions from nanofibers to nanotubes and then to nano-pearl strings...
May 17, 2017: Nanotechnology
An Eng Lim, Chun Yee Lim, Yee Cheong Lam, Rafael Taboryski, Shu Rui Wang
Electroosmotic flow (EOF) is an electric-field-induced fluid flow that has numerous micro-/nanofluidic applications, ranging from pumping to chemical and biomedical analyses. Nanoscale networks/structures are often integrated in microchannels for a broad range of applications, such as electrophoretic separation of biomolecules, high reaction efficiency catalytic microreactors, and enhancement of heat transfer and sensing. Their introduction has been known to reduce EOF. Hitherto, a proper study on the effect of nanostructures orientation on EOF in a microfluidic channel is yet to be carried out...
May 16, 2017: Nanotechnology
Prathamesh A Dhakras, Pratik Agnihotri, Ji Ung Lee
The three pillars of semiconductor device technologies are (1) the p-n diode, (2) the Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) and (3) the Bipolar Junction Transistor (BJT). They have enabled the unprecedented growth in the field of information technology that we see today. Until recently, the technological revolution for better, faster and more efficient devices has been governed by scaling down device dimensions following the Moore's Law. With the slowing of Moore's law, there is a need for alternative materials and computing technologies that can continue the advancement in functionality...
May 16, 2017: Nanotechnology
Tang Lei, Jiafu Shi, Xiaoli Wang, Shaohua Zhang, Hong Wu, Hongfan Sun, Zhongyi Jiang
A facile, efficient and versatile approach is presented to synthesize pH-responsive nanocapsules (~120 nm) by combining the advantages of metal-organic frameworks (MOFs) and metal-organic thin films. The ZIF-8 nanoparticles are used as templates on which a thin film coating of Iron(III)-catechol complexes is derived from the coordination between dopamine-modified alginate (AlgDA) and Iron(III) ions. After the templates removal, nanocapsules with a pH-responsive wall are obtained. Doxorubicin (Dox), a typical anticancer drug, is first immobilized in ZIF-8 frameworks through coprecipitation and then encapsulated in nanocapsules after the removal of ZIF-8...
May 16, 2017: Nanotechnology
Mingyue Li, Meiya Li, Yongdan Zhu, Yiwen Tang, Lihua Bai, Wen Lei, Zhen Wang, Xing-Zhong Zhao
The Au nanoparticles sandwitched double spheric-shells of SiO2@Au@TiO2 (SAT) microspheres are synthesized. The significant influence of the SAT microspheres on the properties of the dye-sensitized solar cells (DSSCs) is investigated. Studies indicate that the introduction of the SAT has markedly enhanced the light scattering and capture ability and thus the photogenerated electrons. The DSSC doping with 2.25 wt% of SAT exhibits the maximum short circuit current density of 17.0 mA cm-2 and photoelectric conversion efficiency of 7...
May 16, 2017: Nanotechnology
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