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Nanoscale Research Letters

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https://read.qxmd.com/read/30783868/mode-locked-er-doped-fiber-laser-by-using-mos-2-sio-2-saturable-absorber
#1
Lu Li, Ruidong Lv, Zhendong Chen, Jiang Wang, Sicong Liu, Wei Ren, Yonggang Wang
The two-dimensional (2D) layered material MoS2 has attracted numerous attentions for electronics and optoelectronics applications. In this work, a novel type of MoS2 -doped sol-gel glass composite material is prepared. The nonlinear optical properties of prepared MoS2 /SiO2 composite material are measured with modulation depth (ΔT) of 3.5% and saturable intensity (Isat ) of 20.15 MW/cm2 . The optical damage threshold is 3.46 J/cm2 . Using the MoS2 /SiO2 composite material as saturable absorber (SA), a passive mode-locked Er-doped fiber (EDF) laser is realized...
February 19, 2019: Nanoscale Research Letters
https://read.qxmd.com/read/30783795/facile-preparation-and-characterization-of-polyaniline-and-ceo-2-co-decorated-tio-2-nanotube-array-and-its-highly-efficient-photoelectrocatalytic-activity
#2
Chunmao Chen, Danchen Zhao, Qingxiang Zhou, Yalin Wu, Xianqi Zhou, Hongyuan Wang
In the present work, polyaniline and CeO2 co-decorated TiO2 nanotube arrays (PANI/CeO2 /TiO2 NTAs) were facilely prepared by an electrochemical method. The as-prepared materials were characterized by scanning electron microscopy (SEM), an X-ray diffractometer (XRD), and energy-dispersive X-ray spectroscopy (EDS). The photoelectrocatalytic activity of as-prepared materials was investigated with tetrabromobisphenol A (TBBPA) as the target analyte, and the data showed that PANI/CeO2 /TiO2 NTAs resulted in much higher photoelectrocatalytic efficiency than that of other materials...
February 19, 2019: Nanoscale Research Letters
https://read.qxmd.com/read/30778693/piperlongumine-eluting-gastrointestinal-stent-using-reactive-oxygen-species-sensitive-nanofiber-mats-for-inhibition-of-cholangiocarcinoma-cells
#3
Hyung Ha Jang, Su Bum Park, Jeong Sup Hong, Hye Lim Lee, Yeon Hui Song, Jungsoo Kim, Yun Hye Jung, Chan Kim, Doo-Man Kim, Sang Eun Lee, Young-Il Jeong, Dae Hwan Kang
BACKGROUND: The aim of this study is to fabricate drug-eluting gastrointestinal (GI) stent using reactive oxygen species (ROS)-sensitive nanofiber mats for treatment of cholangiocarcinoma (CCA) cell. A ROS-producing agent, piperlongumine (PL)-incorporated nanofiber mats were investigated for drug-eluting stent (DES) application. METHODS: Selenocystamine-conjugated methoxy poly(ethylene glycol) (MePEG) was conjugated with poly(L-lactide) (PLA) to produce block copolymer (LEse block copolymer)...
February 18, 2019: Nanoscale Research Letters
https://read.qxmd.com/read/30767099/biodegradation-assessment-of-poly-lactic-acid-filled-with-functionalized-titania-nanoparticles-pla-tio-2-under-compost-conditions
#4
Yanbing Luo, Zicong Lin, Gang Guo
This paper presents a biodegradation study conducted for 90 days under standardized controlled composting conditions of poly (lactic acid) (PLA) filled with functionalized anatase-titania nanofiller (PLA/TiO2 nanocomposites). The surface morphology, thermal properties, percentage of biodegradation, and molecular weight changes at different incubation times were evaluated via visual inspection, scanning electron microscopy (SEM), X-ray diffraction (XRD), differential scanning calorimetry (DSC), and gel permeation chromatography (GPC) by taking degraded samples from compost at the end of target biodegradation time interval...
February 14, 2019: Nanoscale Research Letters
https://read.qxmd.com/read/30767075/high-methanol-gas-sensing-performance-of-sm-2-o-3-zno-smfeo-3-microspheres-synthesized-via-a-hydrothermal-method
#5
Kun Li, Yinzhen Wu, Mingpeng Chen, Qian Rong, Zhongqi Zhu, Qingju Liu, Jin Zhang
In this work, we synthesized Sm2 O3 /ZnO/SmFeO3 microspheres by a hydrothermal method combined with microwave assistance to serve as a methanol gas sensor. We investigated the effect on the microstructure at different hydrothermal times (12 h, 18 h, 24 h, and 30 h), and the BET and XPS results revealed that the specific surface area and adsorbed oxygen species were consistent with a microstructure that significantly influences the sensing performance. The gas properties of the Sm2 O3 -doped ZnO/SmFeO3 microspheres were also investigated...
February 14, 2019: Nanoscale Research Letters
https://read.qxmd.com/read/30747362/low-temperature-plasma-enhanced-atomic-layer-deposition-of-sio-2-using-carbon-dioxide
#6
Zhen Zhu, Perttu Sippola, Oili M E Ylivaara, Chiara Modanese, Marisa Di Sabatino, Kenichiro Mizohata, Saoussen Merdes, Harri Lipsanen, Hele Savin
In this work, we report the successful growth of high-quality SiO2 films by low-temperature plasma-enhanced atomic layer deposition using an oxidant which is compatible with moisture/oxygen sensitive materials. The SiO2 films were grown at 90 °C using CO2 and Bis(tertiary-butylamino)silane as process precursors. Growth, chemical composition, density, optical properties, and residual stress of SiO2 films were investigated. SiO2 films having a saturated growth-per-cycle of ~ 1.15 Å/cycle showed a density of ~ 2...
February 12, 2019: Nanoscale Research Letters
https://read.qxmd.com/read/30747342/self-assembly-stability-and-variability-of-bacterial-microcompartment-shell-proteins-in-response-to-the-environmental-change
#7
Matthew Faulkner, Long-Sheng Zhao, Steve Barrett, Lu-Ning Liu
Bacterial microcompartments (BMCs) are proteinaceous self-assembling organelles that are widespread among the prokaryotic kingdom. By segmenting key metabolic enzymes and pathways using a polyhedral shell, BMCs play essential roles in carbon assimilation, pathogenesis, and microbial ecology. The BMC shell is composed of multiple protein homologs that self-assemble to form the defined architecture. There is tremendous interest in engineering BMCs to develop new nanobioreactors and molecular scaffolds. Here, we report the quantitative characterization of the formation and self-assembly dynamics of BMC shell proteins under varying pH and salt conditions using high-speed atomic force microscopy (HS-AFM)...
February 12, 2019: Nanoscale Research Letters
https://read.qxmd.com/read/30742246/dielectric-enhancement-of-atomic-layer-deposited-al-2-o-3-zro-2-al-2-o-3-mim-capacitors-by-microwave-annealing
#8
Bao Zhu, Xiaohan Wu, Wen-Jun Liu, Shi-Jin Ding, David Wei Zhang, Zhongyong Fan
For metal-insulator-metal (MIM) capacitors applicated in the fields of RF, DRAM, and analog/mixed-signal integrated circuits, a high capacitance density is imperative with the downscaling of the device feature size. In this work, the microwave annealing technique is investigated to enhance the dielectric characteristics of Al2 O3 /ZrO2 /Al2 O3 based MIM capacitors. The results show that the permittivity of ZrO2 is increased to 41.9 (~ 40% enhanced) with a microwave annealing at 1400 W for 5 min. The substrate temperature is lower than 400 °C, which is compatible with the back end of line process...
February 11, 2019: Nanoscale Research Letters
https://read.qxmd.com/read/30742238/nanostructured-pd-based-electrocatalyst-and-membrane-electrode-assembly-behavior-in-a-passive-direct-glycerol-fuel-cell
#9
N Yahya, S K Kamarudin, N A Karim, S Basri, A M Zanoodin
The aim of this study was to synthesize, characterize, and observe the catalytic activity of Pd1 Au1 supported by vapor-grown carbon nanofiber (VGCNF) anode catalyst prepared via the chemical reduction method. The formation of the single-phase compounds was confirmed by X-ray diffraction (XRD) and Rietveld refinement analysis, which showed single peaks corresponding to the (111) plane of the cubic crystal structure. Further analysis was carried out by field emission scanning emission microscopy (FESEM), energy dispersive X-ray analysis (EDX), nitrogen adsorption/desorption measurements, and X-ray photoelectron spectroscopy (XPS)...
February 11, 2019: Nanoscale Research Letters
https://read.qxmd.com/read/30734146/atomic-layer-deposited-hfalox-based-rram-with-low-operating-voltage-for-computing-in-memory-applications
#10
Zhen-Yu He, Tian-Yu Wang, Lin Chen, Hao Zhu, Qing-Qing Sun, Shi-Jin Ding, David Wei Zhang
With Moore's law closing to its physical limit, traditional von Neumann architecture is facing a challenge. It is expected that the computing in-memory architecture-based resistive random access memory (RRAM) could be a potential candidate to overcome the von Neumann bottleneck problem of traditional computers [Backus, J, Can programming be liberated from the von Neumann style?, 1977]. In this work, HfAlOx-based RRAM which is compatible with CMOS technology was fabricated by an atomic layer deposition (ALD) process...
February 7, 2019: Nanoscale Research Letters
https://read.qxmd.com/read/30756198/large-scale-bandwidth-adjustable-visible-absorbers-by-evaporation-and-annealing-process
#11
Xiyu Long, Weisheng Yue, Yarong Su, Weidong Chen, Ling Li
Optical absorbers have received a significant amount of attention due to their wide range of applications in biomedical sensing, solar cell, photon detection, and surface-enhanced Raman spectroscopy. However, most of the optical absorbers are fabricated with high-cost sophisticated nanofabrication techniques, which limit their practical applications. Here, we introduce a cost-effective method to fabricate an optical absorber by using a simple evaporation technique. The absorbers are composed of evaporated nanoparticles above a silver (Ag) mirror separated by a silicon oxide layer...
February 6, 2019: Nanoscale Research Letters
https://read.qxmd.com/read/30725329/fabrication-of-cdte-qds-bioi-promoted-tio-2-hollow-microspheres-with-superior-photocatalytic-performance-under-simulated-sunlight
#12
Xiaofei Qu, Meihua Liu, Longfei Li, Chunqi Wang, Cuihua Zeng, Jianhuang Liu, Liang Shi, Fanglin Du
Hollow and heterostructured architectures are recognized as an effective approach to improve photocatalytic performance. In this work, ternary TiO2 /CdTe/BiOI with hollow structure was constructed via a step-by-step method. In addition, the effect of TiO2 structural regulation and the energy band alignment of BiOI and CdTe quantum dots (CdTe QDs) with TiO2 in TiO2 /CdTe/BiOI on photocatalytic dye removal were also studied. The results reveal that the TiO2 /CdTe/BiOI heterostructures with hollow substrates exhibit much higher photocatalytic activities than pure TiO2 , P25, TiO2 /CdTe, and TiO2 /BiOI and ternary TiO2 /CdTe/BiOI with solid substrates...
February 6, 2019: Nanoscale Research Letters
https://read.qxmd.com/read/30725327/preparation-and-characterization-of-tadpole-and-sphere-shaped-hemin-nanoparticles-for-enhanced-solubility
#13
Jie Yang, Liu Xiong, Man Li, Junxia Xiao, Xin Geng, Baowei Wang, Qingjie Sun
Hemin is a potent iron supplement. A major limitation of the applicability of hemin is its extremely low aqueous solubility and bioavailability. The aim of this work is to prepare hemin nanoparticles with improved solubility. Transmission electron microscopic images showed that hemin nanoparticles with different initial concentrations of hemin (0.1 and 0.5 mg/mL) were tadpole-shaped (head of approximately 200 nm and tail of 100 nm) and sphere-shaped (50-100 nm), respectively. Moreover, hemin nanoparticles exhibited higher solubility than free hemin...
February 6, 2019: Nanoscale Research Letters
https://read.qxmd.com/read/30725240/well-aligned-tio-2-nanotube-arrays-with-ag-nanoparticles-for-highly-efficient-detection-of-fe-3-ion
#14
Zong-Min Ma, Xing-Sheng Wu, Dou-Dou Zheng, Jiu-Yan Wei, Yan-Na Xie, Yun-Bo Shi, Kun Huang, Xiao-Ming Zhang, Jun Liu
Nowadays, determination of the iron ions with high sensitivity and selectivity with novel methods becomes a matter of urgency for monitoring healthy body and environment. In this paper, for the first time, we present a set of high-performance TiO2 nanotube arrays which are quite sensitive to iron ions. Firstly, the anodic oxidation method was adopted to prepare ordered TiO2 nanotube arrays, followed by functionalized Ag nanoparticle deposition with the enhancement ability in iron ion sensing. Besides, the spectrum of the TiO2 nanotube with/without the Ag nanoparticles was analyzed with an X-ray photoelectron spectrometer, which shows that Ag nanoparticles can effectively reduce the recombination rate of electrons and holes, and increase the conductivity and the charge transfer rate of the electrodes...
February 6, 2019: Nanoscale Research Letters
https://read.qxmd.com/read/30721361/direct-growth-of-single-crystalline-gan-nanowires-on-indium-tin-oxide-coated-silica
#15
Aditya Prabaswara, Jung-Wook Min, Ram Chandra Subedi, Malleswararao Tangi, Jorge A Holguin-Lerma, Chao Zhao, Davide Priante, Tien Khee Ng, Boon S Ooi
In this work, we demonstrated the direct growth of GaN nanowires on indium tin oxide (ITO)-coated fused silica substrate. The nanowires were grown catalyst-free using plasma-assisted molecular beam epitaxy (PA-MBE). The effect of growth condition on the morphology and quality of the nanowires is systematically investigated. Structural characterization indicates that the nanowires grow in the (0001) direction directly on top of the ITO layer perpendicular to the substrate plane. Optical characterization of the nanowires shows that yellow luminescence is absent from the nanowire's photoluminescence response, attributed to the low number of defects...
February 5, 2019: Nanoscale Research Letters
https://read.qxmd.com/read/30721359/omnidirectional-absorber-by-the-void-plasmon-effect-in-the-visible-region-with-greatly-enhanced-localized-electric-field
#16
Shiwei Shu, Chengping Huang, Meng Zhang, Yan Yan
We propose and investigate a wide-angle and high-efficiency absorber by using the void plasmon (VP) effect in a Fabry-Perot (FP)-like system, which consists of a perforated metal film and a ground metal plane separated by a dielectric spacer. A hybrid FP/VP resonance mode contributes to the high absorption efficiency. Besides the increased absorption, greatly enhanced localized electric-field intensity at "hot spots" (~ 2284 times) can be achieved. In addition, by varying the thickness of the perforated metal layer and the environmental refractive index, the position of resonance peak can be easily controlled...
February 5, 2019: Nanoscale Research Letters
https://read.qxmd.com/read/30721358/properties-of-the-geometric-phase-in-electromechanical-oscillations-of-carbon-nanotube-based-nanowire-resonators
#17
Jeong Ryeol Choi, Sanghyun Ju
The geometric phase is an extra phase evolution in the wave function of vibrations that is potentially applicable in a broad range of science and technology. The characteristics of the geometric phase in the squeezed state for a carbon-nanotube-based nanowire resonator have been investigated by means of the invariant operator method. The introduction of a linear invariant operator, which is useful for treating a complicated time-dependent Hamiltonian system, enabled us to derive the analytical formula of the geometric phase...
February 5, 2019: Nanoscale Research Letters
https://read.qxmd.com/read/30715600/a-high-performance-rectangular-gate-u-channel-fets-with-only-2-nm-distance-between-source-and-drain-contacts
#18
Xi Liu, Zhengliang Xia, Xiaoshi Jin, Jong-Ho Lee
A novel high-performance rectangular gate U channel FET (RGUC FET) for extreme integrated distance between source and drain contacts is proposed in this paper. The RGUC FET represents nearly ideal subthreshold characteristics till the distance between source/drain (S/D) contacts reduced to 2 nm. Different from the other recessed or U-shaped channel-based FETs, the gate contacts do not need to be formed in the recessed region but only in a layer of spacer for the insulation between the two vertical parts on both sides of the U channel...
February 4, 2019: Nanoscale Research Letters
https://read.qxmd.com/read/30707322/altering-the-optical-properties-of-gaassb-capped-inas-quantum-dots-by-means-of-inalas-interlayers
#19
A Salhi, S Alshaibani, Y Alaskar, H Albrithen, A Albadri, A Alyamani, M Missous
In this work, we investigate the optical properties of InAs quantum dots (QDs) capped with composite In0.15 Al0.85 As/GaAs0.85 Sb0.15 strain-reducing layers (SRLs) by means of high-resolution X-ray diffraction (HRXRD) and photoluminescence (PL) spectroscopy at 77 K. Thin In0.15 Al0.85 As layers with thickness t = 20 Å, 40 Å, and 60 Å were inserted between the QDs and a 60-Å-thick GaAs0.85 Sb0.15 layer. The type II emissions observed for GaAs0.85 Sb0.15 -capped InAs QDs were suppressed by the insertion of the In0...
February 1, 2019: Nanoscale Research Letters
https://read.qxmd.com/read/30707315/smart-materials-for-environmental-remediation-based-on-two-component-gels-room-temperature-phase-selective-gelation-for-the-removal-of-organic-pollutants-including-nitrobenzene-o-dichlorobenzene-and-dye-molecules-from-the-wastewater
#20
Jing Zhang, Jiahui Liu, Ciqing Tong, Shipeng Chen, Baohao Zhang, Bao Zhang, Jian Song
Novel two-component gel systems based on aliphatic acid-hydroxy/base interaction were developed as smart materials for environmental remediation. The G1-A16 gelator could be used directly as a powder form to selectively gel aromatic solvents (nitrobenzene and o-dichlorobenzene) from their mixtures with wastewater (containing 0.5 M sodium nitrate and 0.5 M sodium sulfate) via a simple shaking strategy at room temperature without employing co-solvents and a heating-cooling process. Meanwhile, the two-component gel system can efficiently remove the toxic dyes from the aqueous solution...
February 1, 2019: Nanoscale Research Letters
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