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Nanoscale Research Letters

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https://www.readbyqxmd.com/read/28091953/fullerene-c60-penetration-into-leukemic-cells-and-its-photoinduced-cytotoxic-effects
#1
D Franskevych, K Palyvoda, D Petukhov, S Prylutska, I Grynyuk, C Schuetze, L Drobot, O Matyshevska, U Ritter
Fullerene C60 as a representative of carbon nanocompounds is suggested to be promising agent for application in photodynamic therapy due to its unique physicochemical properties. The goal of this study was to estimate the accumulation of fullerene C60 in leukemic cells and to investigate its phototoxic effect on parental and resistant to cisplatin leukemic cells. Stable homogeneous water colloid solution of pristine C60 with average 50-nm diameter of nanoparticles was used in experiments. Fluorescent labeled C60 was synthesized by covalent conjugation of C60 with rhodamine B isothiocyanate...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28091952/nanometric-cutting-of-silicon-with-an-amorphous-crystalline-layered-structure-a-molecular-dynamics-study
#2
Jinshi Wang, Fengzhou Fang, Xiaodong Zhang
Materials with specific nanometric layers are of great value in both theoretical and applied research. The nanometric layer could have a significant influence on the response to the mechanical loading. In this paper, the nanometric cutting on the layered systems of silicon has been studied by molecular dynamics. This kind of composite structure with amorphous layer and crystalline substrate is important for nanomachining. Material deformation, stress status, and chip formation, which are the key issues in nano-cutting, are analyzed...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28091951/femtosecond-circular-photon-drag-effect-in-the-ag-pd-nanocomposite
#3
Gennady M Mikheev, Aleksandr S Saushin, Viatcheslav V Vanyukov, Konstantin G Mikheev, Yuri P Svirko
We report on the observation of the helicity-dependent photoresponse of the 20-μm-thick silver-palladium (Ag/Pd) nanocomposite films. In the experiment, 120 fs pulses of Ti:S laser induced in the film an electric current perpendicular to the incidence plane. The photoinduced current is a linear function of the incident beam power, and its sign depends on the beam polarization and angle of incidence. In particular, the current is zero for the p- and s-polarized beams, while its sign is opposite for the right- and left-circularly polarized beams...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28091950/nanorods-on-surface-of-gan-based-thin-film-leds-deposited-by-post-annealing-after-photo-assisted-chemical-etching
#4
Lung-Chien Chen, Wun-Wei Lin, Te-Yu Liu
This study investigates the optoelectronic characteristics of gallium nitride (GaN)-based thin-film light-emitting diodes (TF-LEDs) that are formed by a two-step transfer process that involves wet etching and post-annealing. In the two-step transfer process, GaN LEDs were stripped from sapphire substrates by the laser lift-off (LLO) method using a KrF laser and then transferred onto ceramic substrates. Ga-K nanorods were formed on the surface of the GaN-based TF-LEDs following photo-assisted chemical etching and photo-enhanced post-annealing at 100 °C for 1 min...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28091949/nonmechanical-infrared-beam-steering-using-blue-addressed-quantum-dot-doped-liquid-crystal-grating
#5
Xiangru Wang, Xiaoping Huang, Ziqiang Huang, Liang Wu, Jiyang Shang, Qi Qiu, Shuanghong Wu
We present a scheme of nonmechanical laser beam steering using ZnS/InP quantum dots doping nematic liquid crystal as the optical recording film. Because of its internal electric field generated by blue laser-induced charge carrier distribution, liquid crystal molecules are reoriented to form a phase grating which make the incident angle steer to the angle as we desire. Being a nonmechanical programmable laser beam steering, the anisotropy of the relative permittivity tensor and blue laser-induced electric carriers play a significant effect in determining the reorientable liquid crystal molecule and reconfigurable phase modulation of the gratings, that determines the steering angle and steering efficiency...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28091948/demonstration-of-logic-operations-in-high-performance-rram-crossbar-array-fabricated-by-atomic-layer-deposition-technique
#6
Runze Han, Peng Huang, Yudi Zhao, Zhe Chen, Lifeng Liu, Xiaoyan Liu, Jinfeng Kang
In this paper, resistive random access memory (RRAM)-based crossbar arrays with the cell structure of Pt/[AlO y /HfO x ] m /TiN were fabricated by using atomic layer deposition (ALD) technique. The RRAM devices in the arrays show excellent performances such as good uniformity and high reliability. Based on the fabricated RRAM array, a complete set of basic logic operations including NOR and XNOR were successfully demonstrated.
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28091947/characteristics-of-the-energetic-micro-initiator-through-integrating-al-ni-nano-multilayers-with-cu-film-bridge
#7
Yuxin Zhang, Hongchuan Jiang, Xiaohui Zhao, Yichao Yan, Wanli Zhang, Yanrong Li
An energetic micro-initiator through integrating Al/Ni nano-multilayers with Cu film bridge was investigated in this study. The Cu film bridge was initially fabricated with wet etching, and Al/Ni nano-multilayers were alternately deposited on the surface of Cu film bridge by magnetron sputtering. The periodic layer structure of Al/Ni nano-multilayers was verified by scanning electron microscopy. The exothermic reaction in Al/Ni nano-multilayers can be initiated with onset reaction temperature as low as 503 K, and the total reaction heat is about 774...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28091946/self-catalyzed-growth-of-inas-nanowires-on-inp-substrate
#8
Bang Li, Xin Yan, Xia Zhang, Xiaomin Ren
We report on the self-catalyzed growth of InAs nanowires on InP substrate by metal-organic chemical vapor deposition. At a moderate V/III ratio, tapered nanowires are obtained, suggesting a strong surface diffusion effect. Dense twin faults are observed perpendicular to the nanowire growth direction due to the fluctuation of In atoms in the droplet originating from the surface diffusion effect. At a lower V/III ratio, the nanowires exhibit kinking, which is associated with a high adhesion due to a large sticking coefficient of TMIn...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28091945/optimization-of-ingaas-inalas-avalanche-photodiodes
#9
Jun Chen, Zhengyu Zhang, Min Zhu, Jintong Xu, Xiangyang Li
In this paper, we report a two-dimensional (2D) simulation for InGaAs/InAlAs separate absorption, grading, charge, and multiplication avalanche photodiodes (SAGCM APDs) and study the effect of the charge layer and multiplication layer on the operating voltage ranges of APD. We find that with the increase of the thicknesses as well as the doping concentrations of the charge layer and the multiplication layer, the punchthrough voltage increases; with the increase of the doping concentrations of two layers and the thickness of the charge layer, the breakdown voltage decreases; with the increase of the thickness of the multiplication layer, the breakdown voltage first rapidly declines and then slightly rises...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28091944/controlled-phase-changes-of-titania-using-nitrogen-plasma
#10
R Trejo-Tzab, Liliana Caballero-Espada, P Quintana, Alejandro Ávila-Ortega, R A Medina-Esquivel
In this work, the development of a new crystallization technique is reported, using nitrogen plasma (AC) to obtain nanostructured anatase and rutile from amorphous titanium oxide (TiO2). This methodology increases throughput and minimizes thermal effects. Nanostructured amorphous TiO2 was obtained by the sol-gel method and subsequently subjected to AC treatment, at a controlled pressure, applying different powers and treatment times in order to obtain phase changes. The obtained samples were characterized using X-ray diffraction (XRD), thermogravimetric analysis (TGA), and X-ray photoelectron spectroscopy (XPS)...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28091943/high-sensitive-ultraviolet-photodetectors-based-on-zno-nanorods-cds-heterostructures
#11
Kin-Tak Lam, Yu-Jen Hsiao, Liang-Wen Ji, Te-Hua Fang, Kai-Hua Hsiao, Tung-Te Chu
The ultraviolet (UV) photodetectors with ZnO nanorods (NRs)/CdS thin film heterostructures on glass substrates have been fabricated and characterized. It can be seen that the UV photoresponsivity of such a device became higher as the ZnO NR length was increased in the investigation. With an incident wavelength of 350 nm and 5 V applied bias, the responsivity of photodetectors based on ZnO NR/CdS heterostructures with the ZnO NR length at 500, 350, and 200 nm and traditional CdS film were at 12.86, 3.83, 0...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28084613/supramolecular-gel-templated-in-situ-synthesis-and-assembly-of-cds-quantum-dots-gels
#12
Lili Zhu, Jie He, Xiaoliang Wang, Dawei Li, Haibing He, Lianbing Ren, Biwang Jiang, Yong Wang, Chao Teng, Gi Xue, Huchun Tao
Although many studies have attempted to develop strategies for spontaneously organizing nanoparticles (NPs) into three-dimensional (3D) geometries, it remains a fascinating challenge. In this study, a method for in situ synthesis and self-assembly of a CdS quantum dots (QDs) gel using a Cd supramolecular gel as a scaffold was demonstrated. During the QDs formation process, the Cd ions that constituted the Cd gels served as the precursors of the CdS QDs, and the oleic acid (OA) that ligated with the Cd in the supramolecular gels was capped on the surface of the CdS QDs in the form of carboxylate...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28078609/enhanced-thermophysical-properties-via-pao-superstructure
#13
Zahra Pournorouz, Amirhossein Mostafavi, Aditya Pinto, Apparao Bokka, Junha Jeon, Donghyun Shin
For the last few years, molten salt nanomaterials have attracted many scientists for their enhanced specific heat by doping a minute concentration of nanoparticles (up to 1% by weight). Likewise, enhancing the specific heat of liquid media is important in many aspects of engineering such as engine oil, coolant, and lubricant. However, such enhancement in specific heat was only observed for molten salts, yet other engineering fluids such as water, ethylene glycol, and oil have shown a decrease of specific heat with doped nanoparticles...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28078608/study-on-the-polarization-of-random-lasers-from-dye-doped-nematic-liquid-crystals
#14
Lihua Ye, Chong Zhao, Yangyang Feng, Bing Gu, Yiping Cui, Yanqing Lu
Random lasers from dye-doped nematic liquid crystal (DDNLC) cells with different rubbing methods were observed due to different random ring cavities that were formed. Through constructing cells with different rubbing methods on the forward and backward surfaces of light-emitting sides, we can get two random laser beams with different polarization directions from one DDNLC cell at the same time, and the polarization direction is along the rubbing direction of the light-emitting sides. Additionally, the influence of external electric field on the polarization degree of random lasers was also studied...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28078607/structure-and-optical-features-of-micro-nanosized-carbon-forms-prepared-by-electrochemical-exfoliation
#15
Sergii G Nedilko, Sergiy Revo, Vitalii Chornii, Vasyl Scherbatskyi, Kateryna Ivanenko, Maksym Nedielko, Yurii Sementsov, Mykola Skoryk, Andrii Nikolenko, Victor Strelchuk
Micro/nanosized carbon materials were prepared by electrochemical exfoliation method in the forms of the colloids and thin films. Scanning electronic microscopy, optical and luminescent microscopy, and Raman scattering and luminescent spectroscopy were applied for characterization of materials. The wide photoluminescence band in the visible spectral region was observed for each of the samples. The shape of the photoluminescence band depends on excitation wavelength and on the size of the particles. At least two components with maxima at ~580 and ~710 nm can be distinguished in the photoluminescence spectra...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28070837/optoelectronic-evaluation-and-loss-analysis-of-pedot-pss-si-hybrid-heterojunction-solar-cells
#16
Zhenhai Yang, Zebo Fang, Jiang Sheng, Zhaoheng Ling, Zhaolang Liu, Juye Zhu, Pingqi Gao, Jichun Ye
The organic/silicon (Si) hybrid heterojunction solar cells (HHSCs) have attracted considerable attention due to their potential advantages in high efficiency and low cost. However, as a newly arisen photovoltaic device, its current efficiency is still much worse than commercially available Si solar cells. Therefore, a comprehensive and systematical optoelectronic evaluation and loss analysis on this HHSC is therefore highly necessary to fully explore its efficiency potential. Here, a thoroughly optoelectronic simulation is provided on a typical planar polymer poly (3,4-ethylenedioxy thiophene):polystyrenesulfonate (PEDOT:PSS)/Si HHSC...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28070836/solvent-a-key-in-digestive-ripening-for-monodisperse-au-nanoparticles
#17
Peng Wang, Xuan Qi, Xuemin Zhang, Tieqiang Wang, Yunong Li, Kai Zhang, Shuang Zhao, Jun Zhou, Yu Fu
This work has mainly investigated the influence of the solvent on the nanoparticles distribution in digestive ripening. The experiments suggested that the solvents played a key role in digestive ripening of Au nanoparticles (Au NPs). For the benzol solvents, the resulting size distribution of Au NPs was inversely related to the solvent polarity. It may be interpreted by the low Gibbs free energy of nanoparticles in the high polarity medium, which was supposedly in favor of reducing the nanoparticles distribution...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28070835/erratum-to-natural-minerals-coated-by-biopolymer-chitosan-synthesis-physicochemical-and-adsorption-properties
#18
T M Budnyak, E S Yanovska, O Yu Kichkiruk, D Sternik, V A Tertykh
No abstract text is available yet for this article.
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28063142/tuning-the-synthesis-of-manganese-oxides%C3%A2-nanoparticles-for-efficient-oxidation-of-benzyl-alcohol
#19
Jingyuan Fei, Lixian Sun, Cuifeng Zhou, Huajuan Ling, Feng Yan, Xia Zhong, Yuxiang Lu, Jeffrey Shi, Jun Huang, Zongwen Liu
The liquid phase oxidation of benzyl alcohol is an important reaction for generating benzaldehyde and benzoic acid that are largely required in the perfumery and pharmaceutical industries. The current production systems suffer from either low conversion or over oxidation. From the viewpoint of economy efficiency and environmental demand, we are aiming to develop new high-performance and cost-effective catalysts based on manganese oxides that can allow the green aerobic oxidation of benzyl alcohol under mild conditions...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28063141/influence-of-atomic-hydrogen-band-bending-and-defects-in-the-top-few-nanometers-of-hydrothermally-prepared-zinc-oxide-nanorods
#20
Mubarak J Al-Saadi, Salim H Al-Harthi, Htet H Kyaw, Myo T Z Myint, Tanujjal Bora, Karthik Laxman, Ashraf Al-Hinai, Joydeep Dutta
We report on the surface, sub-surface (top few nanometers) and bulk properties of hydrothermally grown zinc oxide (ZnO) nanorods (NRs) prior to and after hydrogen treatment. Upon treating with atomic hydrogen (H*), upward and downward band bending is observed depending on the availability of molecular H2O within the structure of the NRs. In the absence of H2O, the H* treatment demonstrated a cleaning effect of the nanorods, leading to a 0.51 eV upward band bending. In addition, enhancement in the intensity of room temperature photoluminescence (PL) signals due to the creation of new surface defects could be observed...
December 2017: Nanoscale Research Letters
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