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Nanoscale Research Letters

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https://www.readbyqxmd.com/read/29926274/millstone-exfoliation-a-true-shear-exfoliation-for-large-size-few-layer-graphene-oxide
#1
Heng-Ju Yoon, Jae Young Lee, Tae-Ho Yoon
A millstone (MS) was introduced in the production of large-size few-layer-graphene oxide (FLGO) via true shear exfoliation in order to minimize fragmentation. The MS was constructed with two glass plates, where the top plate was designed to rotate against the stationary bottom plate, thereby generating true shear force. Mildly oxidized graphite (MOG) was used for MS exfoliation in order to obtain both good property and high yield. The rpm of rotation (10, 20, 30, 40, and 50), solution concentration (0.5, 1, and 2 mg/ml), and number of exfoliation (1, 2, and 3) were optimized by measuring the UV-vis absorption, and the effect of oxidation time (30, 60, and 90 min) was studied under the given optimum conditions...
June 20, 2018: Nanoscale Research Letters
https://www.readbyqxmd.com/read/29926214/in-situ-growth-of-metal-sulfide-nanocrystals-in-poly-3-hexylthiophene-6-6-phenyl-c61-butyric-acid-methyl-ester-films-for-inverted-hybrid-solar-cells-with-enhanced-photocurrent
#2
Chunyan Yang, Yingying Sun, Xinjie Li, Cheng Li, Junfeng Tong, Jianfeng Li, Peng Zhang, Yangjun Xia
It has been reported that the performance of bulk heterojunction organic solar cells can be improved by incorporation of nano-heterostructures of metals, semiconductors, and dielectric materials in the active layer. In this manuscript, CdS or Sb2 S3 nanocrystals were in situ generated inside the poly(3-hexylthiophene): [6,6]-phenyl C61-butyric acid (P3HT:PC61 BM) system by randomly mixing P3HT and PC61 BM in the presence of cadmium or antimony xanthate precursor. Hybrid solar cells (HSCs) with the configurations of tin-doped indium oxide substrate (ITO)/CdS interface layer/P3HT:PC61 BM: x wt...
June 20, 2018: Nanoscale Research Letters
https://www.readbyqxmd.com/read/29926203/tuning-the-optical-properties-of-cspbbr-3-nanocrystals-by-anion-exchange-reactions-with-csx-aqueous-solution
#3
Anping Yan, Yunlan Guo, Chao Liu, Zhao Deng, Yi Guo, Xiujian Zhao
Topotactic anion exchange has been developed to tune the composition and band gap energies of cesium lead halide (CsPbX3 ) perovskite nanocrystals (NCs). However, current anion exchange methods either require harsh conditions or take a long time to realize substantial substitution. Here, we present a method to modulate the composition of colloidal CsPbBr3 NCs through ultrasonication-assisted anion exchange with CsX (X = Cl, I) solution. Efficient anion exchange of CsPbBr3 NCs with Cl- or I- is realized with substitution ratio up to 93% and preservation of the pristine shape and structure of CsPbBr3 NCs...
June 20, 2018: Nanoscale Research Letters
https://www.readbyqxmd.com/read/29916083/cd-free-cu-doped-znins-zns-core-shell-nanocrystals-controlled-synthesis-and-photophysical-properties
#4
Manpreet Kaur, Ashma Sharma, Murat Olutas, Onur Erdem, Akshay Kumar, Manoj Sharma, Hilmi Volkan Demir
Here, we report efficient composition-tunable Cu-doped ZnInS/ZnS (core and core/shell) colloidal nanocrystals (CNCs) synthesized by using a colloidal non-injection method. The initial precursors for the synthesis were used in oleate form rather than in powder form, resulting in a nearly defect-free photoluminescence (PL) emission. The change in Zn/In ratio tunes the percentage incorporation of Cu in CNCs. These highly monodisperse Cu-doped ZnInS CNCs having variable Zn/In ratios possess peak emission wavelength tunable from 550 to 650 nm in the visible spectrum...
June 18, 2018: Nanoscale Research Letters
https://www.readbyqxmd.com/read/29915874/the-toxic-truth-about-carbon-nanotubes-in-water-purification-a-perspective-view
#5
Rasel Das, Bey Fen Leo, Finbarr Murphy
Without nanosafety guidelines, the long-term sustainability of carbon nanotubes (CNTs) for water purifications is questionable. Current risk measurements of CNTs are overshadowed by uncertainties. New risks associated with CNTs are evolving through different waste water purification routes, and there are knowledge gaps in the risk assessment of CNTs based on their physical properties. Although scientific efforts to design risk estimates are evolving, there remains a paucity of knowledge on the unknown health risks of CNTs...
June 18, 2018: Nanoscale Research Letters
https://www.readbyqxmd.com/read/29904896/reduced-graphene-oxide-carbon-nanotube-composites-as-electrochemical-energy-storage-electrode-applications
#6
Wenyao Yang, Yan Chen, Jingfeng Wang, Tianjun Peng, Jianhua Xu, Bangchao Yang, Ke Tang
We demonstrate an electrochemical reduction method to reduce graphene oxide (GO) to electrochemically reduced graphene oxide (ERGO) with the assistance of carbon nanotubes (CNTs). The faster and more efficient reduction of GO can be achieved after proper addition of CNTs into GO during the reduction process. This nanotube/nanosheet composite was deposited on electrode as active material for electrochemical energy storage applications. It has been found that the specific capacitance of the composite film was strongly affected by the mass ratio of GO/CNTs and the scanning ratio of cyclic voltammetry...
June 15, 2018: Nanoscale Research Letters
https://www.readbyqxmd.com/read/29904885/preparation-of-a-periodic-polystyrene-nanosphere-array-using-the-dip-drop-method-with-post-deposition-etching-and-its-application-of-improving-light-extraction-efficiency-of-ingan-gan-leds
#7
Po-Hsun Lei, Chyi-Da Yang, Yong-Sian Yang, Jian-Hong Lin
In this study, we synthesized a periodic polystyrene nanosphere (PS NS) array using the dip-drop method with post-deposition etching to improve the light extraction efficiency (LEE) of InGaN/GaN light-emitting diodes (LEDs). The dip-drop method has advantages such as simple procedure, inexpensive equipment, room temperature deposition, and easy implementation in LEDs. The arrangement of PS NSs on an indium-tin-oxide (ITO)-coated glass substrate depends on the average dip-drop speed and the concentration of the PS NS suspension...
June 15, 2018: Nanoscale Research Letters
https://www.readbyqxmd.com/read/29900489/titania-nanotubes-prepared-by-rapid-breakdown-anodization-for-photocatalytic-decolorization-of-organic-dyes-under-uv-and-natural-solar-light
#8
Saima Ali, Henrika Granbohm, Jouko Lahtinen, Simo-Pekka Hannula
Titania nanotube (TNT) powder was prepared by rapid breakdown anodization (RBA) in a perchloric acid electrolyte. The photocatalytic efficiency of the as-prepared and powders annealed at temperatures between 250 and 550 °C was tested under UV and natural sunlight irradiation by decolorization of both anionic and cationic organic dyes, i.e., methyl orange (MO) and rhodamine B (RhB), as model pollutants. The tubular structure of the nanotubes was retained up to 250 °C, while at 350 °C and above, the nanotubes transformed into nanorods and nanoparticles...
June 14, 2018: Nanoscale Research Letters
https://www.readbyqxmd.com/read/29900488/a-hydrothermal-synthesis-of-fe-3-o-4-c-hybrid-nanoparticle-and-magnetic-adsorptive-performance-to-remove-heavy-metal-ions-in-aqueous-solution
#9
Siping Ji, Changlin Miao, Hui Liu, Lili Feng, Xiangjun Yang, Hong Guo
Advanced core-shelled material with a high specific area has been considered as an effective material to remove heavy metal from aqueous solutions. A core-shelled Fe3 O4 @C hybrid nanoparticle aggregates with environmental-friendly channel in the study. Moreover, the higher exposure of adsorption sites can be achieved for the special configuration that higher Brunauer-Emmet-Teller (BET) surface area reaches up to 238.18 m2  g-1 . Thus, a more efficiently heavy metal ion removal is obtained, Pb (II), Cd (II), Cu (II), and Cr (VI) up to 100, 99...
June 13, 2018: Nanoscale Research Letters
https://www.readbyqxmd.com/read/29892834/controllable-fabrication-of-non-close-packed-colloidal-nanoparticle-arrays-by-ion-beam-etching
#10
Jie Yang, Mingling Zhang, Xu Lan, Xiaokang Weng, Qijiang Shu, Rongfei Wang, Feng Qiu, Chong Wang, Yu Yang
Polystyrene (PS) nanoparticle films with non-close-packed arrays were prepared by using ion beam etching technology. The effects of etching time, beam current, and voltage on the size reduction of PS particles were well investigated. A slow etching rate, about 9.2 nm/min, is obtained for the nanospheres with the diameter of 100 nm. The rate does not maintain constant with increasing the etching time. This may result from the thermal energy accumulated gradually in a long-time bombardment of ion beam. The etching rate increases nonlinearly with the increase of beam current, while it increases firstly then reach its saturation with the increase of beam voltage...
June 11, 2018: Nanoscale Research Letters
https://www.readbyqxmd.com/read/29884975/one-pot-synthesis-of-monodisperse-cofe-2-o-4-ag-core-shell-nanoparticles-and-their-characterization
#11
Shuta Hara, Jumpei Aisu, Masahiro Kato, Takashige Aono, Kosuke Sugawa, Kouichi Takase, Joe Otsuki, Shigeru Shimizu, Hiroki Ikake
In recent years, monodispersed magnetic nanoparticles with a core/shell structure are expected for their wide applications including magnetic fluid, recoverable catalysts, and biological analysis. However, their synthesis method needs numerous processes such as solvent substitution, exchange of protective agents, and centrifugation. A simple and rapid method for the synthesis of monodispersed core-shell nanoparticles makes it possible to accelerate their further applications. This paper describes a simple and rapid one-pot synthesis of core (CoFe2 O4 )-shell (Ag) nanoparticles with high monodispersity...
June 8, 2018: Nanoscale Research Letters
https://www.readbyqxmd.com/read/29882116/dual-emissive-and-color-tunable-mn-doped-inp-zns-quantum-dots-via-a-growth-doping-method
#12
Guilin Zhang, Shiliang Mei, Xian Wei, Chang Wei, Wu Yang, Jiatao Zhu, Wanglu Zhang, Ruiqian Guo
In this letter, dual-emissive and color-tunable Mn-doped InP/ZnS quantum dots (Mn:InP/ZnS QDs) with the absolute photoluminescence quantum yield (PL QY) up to 78% were successfully synthesized via a growth-doping method. The dual emission of Mn:InP/ZnS QDs is composed of intrinsic emission and Mn-doped emission, which can be tuned by different Mn/In ratios. With the increase of Mn dopant concentration, the intrinsic emission shows a red shift from 485 to 524 nm. The new class of dual-emissive QDs provides potential for future application in white LED...
June 7, 2018: Nanoscale Research Letters
https://www.readbyqxmd.com/read/29882075/effect-of-enhanced-thermal-stability-of-alumina-support-layer-on-growth-of-vertically-aligned-single-walled-carbon-nanotubes-and-their-application-in-nanofiltration-membranes
#13
Jung Bin In, Kang Rae Cho, Tung Xuan Tran, Seok-Min Kim, Yinmin Wang, Costas P Grigoropoulos, Aleksandr Noy, Francesco Fornasiero
We investigate the thermal stability of alumina supporting layers sputtered at different conditions and its effect on the growth of aligned single-walled carbon nanotube arrays. Radio frequency magnetron sputtering of alumina under oxygen-argon atmosphere produces a Si-rich alumina alloy film on a silicon substrate. Atomic force microscopy on the annealed catalysts reveals that Si-rich alumina films are more stable than alumina layers with low Si content at the elevated temperatures at which the growth of single-walled carbon nanotubes is initiated...
June 7, 2018: Nanoscale Research Letters
https://www.readbyqxmd.com/read/29882047/material-and-optical-properties-of-fluorescent-carbon-quantum-dots-fabricated-from-lemon-juice-via-hydrothermal-reaction
#14
Meiqin He, Jin Zhang, Hai Wang, Yanrong Kong, Yiming Xiao, Wen Xu
The water-soluble fluorescent carbon quantum dots (CQDs) are synthesized by utilizing lemon juice as carbon resource via a simple hydrothermal reaction. The obtained CQDs are with an average size of 3.1 nm. They reveal uniform morphology and well-crystalline and can generate bright blue-green light emission under UV or blue light irradiation. We find that the fluorescence from these CQDs is mainly induced by the presence of oxygen-containing groups on the surface and edge of the CQDs. Moreover, we demonstrate that the as-prepared CQDs can be applied to imaging plant cells...
June 7, 2018: Nanoscale Research Letters
https://www.readbyqxmd.com/read/29882031/design-of-strain-engineered-gesn-gesisn-quantum-dots-for-mid-ir-direct-bandgap-emission-on-si-substrate
#15
Reem Al-Saigh, Mourad Baira, Bassem Salem, Bouraoui Ilahi
Strain-engineered self-assembled GeSn/GeSiSn quantum dots in Ge matrix have been numerically investigated aiming to study their potentiality towards direct bandgap emission in the mid-IR range. The use of GeSiSn alloy as surrounding media for GeSn quantum dots (QD) allows adjusting the strain around the QD through the variation of Si and/or Sn composition. Accordingly, the lattice mismatch between the GeSn quantum dots and the GeSiSn surrounding layer has been tuned between - 2.3 and - 4.5% through the variation of the Sn barrier composition for different dome-shaped QD sizes...
June 7, 2018: Nanoscale Research Letters
https://www.readbyqxmd.com/read/29881976/frequency-modulated-wave-dielectrophoresis-of-vesicles-and-cells-periodic-u-turns-at-the-crossover-frequency
#16
Hiroshi Frusawa
We have formulated the dielectrophoretic force exerted on micro/nanoparticles upon the application of frequency-modulated (FM) electric fields. By adjusting the frequency range of an FM wave to cover the crossover frequency f X in the real part of the Clausius-Mossotti factor, our theory predicts the reversal of the dielectrophoretic force each time the instantaneous frequency periodically traverses f X . In fact, we observed periodic U-turns of vesicles, leukemia cells, and red blood cells that undergo FM wave dielectrophoresis (FM-DEP)...
June 7, 2018: Nanoscale Research Letters
https://www.readbyqxmd.com/read/29881924/preparation-of-hierarchical-porous-silicalite-1-encapsulated-ag-nps-and-its-catalytic-performance-for-4-nitrophenol-reduction
#17
Bin Wang, Haojiang Wang, Fengwei Zhang, Tijian Sun
A facile and efficient strategy is presented for the encapsulation of Ag NPs within hierarchical porous silicalite-1. The physicochemical properties of the resultant catalyst are characterized by TEM, XRD, FTIR, and N2 adsorption-desorption analytical techniques. It turns out that the Ag NPs are well distributed in MFI zeolite framework, which possesses hierarchical porous characteristics (1.75, 3.96 nm), and the specific surface area is as high as 243 m2  · g-1 . More importantly, such catalyst can rapidly transform the 4-nitrophenol to 4-aminophenol in aqueous solution at room temperature, and a quantitative conversion is also obtained after being reused 10 times...
June 7, 2018: Nanoscale Research Letters
https://www.readbyqxmd.com/read/29881900/wavelength-controlled-photodetector-based-on-single-cdsse-nanobelt
#18
Xinmin Li, Qiuhong Tan, Xiaobo Feng, Qianjin Wang, Yingkai Liu
CdSSe nanobelts (NBs) are synthesized by thermal evaporation and then characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), transmission electron microscopy (TEM), high-resolution electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), photoluminescence (PL), and cathodoluminescence (CL). It is found that the CdSSe NBs have a good morphology and microstructure without defects. CL is sensitive to the defects of CdSSe NBs; thus, we can select single nanobelt with homogeneous CL emission to prepare a detector...
June 7, 2018: Nanoscale Research Letters
https://www.readbyqxmd.com/read/29872934/significant-enhancement-of-mgzno-metal-semiconductor-metal-photodetectors-via-coupling-with-pt-nanoparticle-surface-plasmons
#19
Zexuan Guo, Dayong Jiang, Nan Hu, Xiaojiang Yang, Wei Zhang, Yuhan Duan, Shang Gao, Qingcheng Liang, Tao Zheng, Jingwen Lv
We proposed and demonstrated MgZnO metal-semiconductor-metal (MSM) ultraviolet photodetectors (UV) assisted with surface plasmons (SPs) prepared by the radio frequency magnetron sputtering deposition method. After the decoration of their surface with Pt nanoparticles (NPs), the responsivity of all the electrode spacing (3, 5, and 8 μm) photodetectors were enhanced dramatically; to our surprise, comparing with them the responsivity of larger spacing sample, more SPs were gathered which are smaller than others in turn...
June 5, 2018: Nanoscale Research Letters
https://www.readbyqxmd.com/read/29855822/vertically-aligned-ultrathin-1t-ws-2-nanosheets-enhanced-the-electrocatalytic-hydrogen-evolution
#20
Qunying He, Longlu Wang, Kai Yin, Shenglian Luo
Efficient evolution of hydrogen through electrocatalysis holds tremendous promise for clean energy. The catalytic efficiency for hydrogen evolution reaction (HER) strongly depends on the number and activity of active sites. To this end, making vertically aligned, ultrathin, and along with rich metallic phase WS2 nanosheets is effective to maximally unearth the catalytic performance of WS2 nanosheets. Metallic 1T polymorph combined with vertically aligned ultrathin WS2 nanosheets on flat substrate is successfully prepared via one-step simple hydrothermal reaction...
May 31, 2018: Nanoscale Research Letters
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