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Localized Surface Plasmon Resonance Enhanced Photocatalytic Hydrogen Evolution via Pt@Au NRs/C <sub/>3</sub> N <sub/>4</sub> Nanotubes under Visible-Light Irradiation
摘要： Au nanorods (NRs) decorated carbon nitride nanotubes (Au NRs/CNNTs) photocatalysts have been designed and prepared by impregnation–annealing approach. Localized surface plasmon resonance (LSPR) peaks of Au NRs can be adjusted by changing the aspect ratios, and the light absorption range of Au NRs/CNNTs is extended to longer wavelength even near-infrared light. Optimal composition of Pt@Au NR769/CNNT650 has been achieved by adjusting the LSPR peaks of Au NRs and further depositing Pt nanoparticles (NPs), and the photocatalytic H2 evolution rate is 207.0 μmol h?1 (20 mg catalyst). Preliminary LSPR enhancement photocatalytic mechanism is suggested. On one hand, LSPR of Au NRs is beneficial for visible-light utilization. On the other hand, Pt NPs and Au NRs have a synergetic enhancement effect on photocatalytic H2 evolution of CNNTs, in which the local electromagnetic field can improve the photogenerated carrier separation and direct electron transfer increases the hot electron concentration while Au NRs as the electron channel can well restrain charge recombination, finally Pt as co-catalyst can boost H+ reduction rate. This work provides a new way to develop efficient photocatalysts for splitting water, which can simultaneously extend light absorption range and facilitate carrier generation, transportation and reduce carrier recombination.
关键词： synergetic effect,plasmonic photocatalysts,carbon nitride nanotubes,Au nanorods,photocatalytic H2 evolution
更新于2025-09-09 09:28:46
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Synthesis of Gold Nanorods Using Poly(vinylpyrrolidone) of Different Molecular Weights as an Additive
摘要： The use of poly(vinylpyrrolidone) (PVP) of different molecular weights (5-360 kDa) during the synthesis of gold nanorods (AuNRs) via seedless and seed-mediated approaches is reported. For both syntheses, the LSPR band can be tuned from 700 to 1050 nm by modifying the molecular weight of PVP in a time dependent addition of polymer. Moreover, the growth of AuNRs in 100 mM cetyltrimethylammonium bromide (CTAB) is accelerated as the molecular weight of PVP increases from 5 to 360 kDa for the seedless approach. In the case of AuNRs synthesized by the seed-mediated approach, the aspect ratio decreases from 7.41 to 3.72 as the molecular weight of PVP increases to 55 kDa. For both protocols, high molecular weight of PVP reduces the shape yield despite of producing smaller AuNRs. Therefore, the incorporation of small amounts of PVP during the growth stage can be utilized for the preparation of anisotropic nanostructures to tune their optical properties and improve their shape yield.
关键词： Hydroquinone,Poly(vinylpyrrolidone),Seedless synthesis,Seed-mediated synthesis,Gold nanorods
更新于2025-09-09 09:28:46
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[IEEE 2018 19th International Conference on Electronic Packaging Technology (ICEPT) - Shanghai (2018.8.8-2018.8.11)] 2018 19th International Conference on Electronic Packaging Technology (ICEPT) - Room-Temperature Synthesis of Cesium Lead Halide Perovskite Nanorods
摘要： Low-dimensional materials attract much attention because of their unique and outstanding properties in optical and electronic products, giving a promising class of materials for optoelectronic applications. A facile synthesis method of CsPbBr3 nanorods (NRs) was presented in this paper. The nanorods have a one-dimensional (1D) scale, a high photoluminescence quantum yield (PLQY, 60%) and a narrow FWHM. By tuning the ratio of organic ligands, the CsPbBr3 NRs with the diameter of less than 20 nm and length up to several hundred nanometers were obtained. Moreover, because of the quantum confinement effects, a large blue-shift have happened in PL spectra. A light-emitting diode (LED) device was fabricated with our synthesized CsPbBr3 NRs. The LED device showed a strong green emission. All of these shows the ability of halide perovskite nanocrystals for applications on photoelectron, such as optical communication, display, lightning and so on.
关键词： formation mechanism,cesium lead halide perovskite nanorods,light-emitting diode
更新于2025-09-09 09:28:46
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Photocatalytic Degradation of Gentian Violet with Li Doped Bismuth Oxide Nanorods
摘要： Li doped bismuth oxide nanorods have been synthesized via the hydrothermal route. The obtained nanorods possess semi-circular tips, the length and diameter are 1–5 μm and 50–350 nm, respectively. The photocatalytic activity of the Li doped bismuth oxide nanorods has been analyzed by the photocatalytic degradation of gentian violet (GV). GV with the concentration of 10 mg · mL?1 can be photodegraded totally in the presence of 10 mg Li doped bismuth oxide nanorods under UV light irradiation for 60 min. The photodegradation ratio of the Li doped bismuth oxide nanorods is closely relative to the content of the nanorods and initial GV concentration. The photodegradation ratio decreases obviously with the decrease of the content of the nanorods and increase of initial GV concentration.
关键词： Photocatalysis,Li Doped Bismuth Oxide Nanorods,Gentian Violet,Scanning Electron Microscopy
更新于2025-09-09 09:28:46
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Novel Gd(OH)3, GdOOH and Gd2O3 Nanorods: Microwave-Assisted Hydrothermal Synthesis and Optical Properties
摘要： We present a study of the controlled synthesis and optical properties of single-crystals Gd(OH)3, GdOOH and Gd2O3 nanorods. In this work, Gd(OH)3 nanorods were synthesized by a simple and fast microwave-assisted hydrothermal method. This process combined with the thermal decomposition oxidation of Gd(OH)3 nanorods as precursors enabled the preparation of single-crystalline GdOOH and Gd2O3 structures with well-defined morphology at low temperatures. The crystal structure dependence on the optical properties was investigated. We observed a green shift effect on the photoluminescence (PL) emission spectra from Gd(OH)3 to Gd2O3 nanorods, which can be attributed to different types of surface defects, as well as intrinsic properties that contribute significantly to the modified PL behavior.
关键词： GdOOH,Gd(OH)3,Gd2O3,nanorods
更新于2025-09-09 09:28:46
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Improved Gas Sensing Performance of ALD AZO 3-D Coated ZnO Nanorods
摘要： This paper reports an enhancement on the sensing performance of ZnO nanorod ethanol sensors with a new approach by utilizing nested coatings of Aluminum doped ZnO (AZO) thin films by Atomic Layer Deposition (ALD) technology. ZnO nanorods were grown by the hydrothermal method with the ZnO seed layer synthesized on Silicon wafers by ALD. To enhance the sensing performance of ZnO nanorod ethanol sensors, multiple coated AZO thin film 3-D coatings were deposited on the surface of the intrinsic ZnO nanorods by ALD. To investigate the sensing performance of the ZnO nanorods sensor for the detection of ethanol vapor, a gas sensor testing system was designed and built with a sealed reaction chamber and a temperature controller. The demonstrated sensing performance results include the sensing response comparison between ZnO nanorods before and after ALD coatings with AZO films at different temperatures and with various concentrations of input ethanol vapor. The response times and recovery times of ZnO nanorods before and after ALD coatings with AZO thin films were analyzed to investigate the sensing enhancement. The sensing response improvement peaks at 25?C room temperature with approximately 200% enhancement. However, the sensing response improvement decreases as a function of increasing operating temperature.
关键词： ZnO nanorods,gas sensor,ethanol vapor,ALD,AZO
更新于2025-09-09 09:28:46
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Synthesis and Characterization of ZnO Nanorods as an Adsorbent for Cr(VI) Sequestration
摘要： Zinc oxide (ZnO) nanorods were fabricated through hydrothermal route and employed for the adsorption of Cr(VI) ions from aqueous medium. Zinc nitrate hexahydrate (Zn(NO3)2.6H2O) was used as a zinc precursor and Triton-x 100 was used as a capping agent. As synthesized ZnO nanorods were characterized by UV-visible spectroscopy (UV), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and energy dispersive X-Ray spectroscopy (EDX) techniques. The adsorption affecting parameters were investigated for maximum adsorption of Cr(VI) onto ZnO nanorods. The adsorption kinetics, isotherms, and thermodynamics were applied for adsorption mechanism evaluation. Maximum adsorption of Cr(VI) ions (250 mg/g) was achieved using 0.055 g/L ZnO dose at pH 2.0 for the contact time of 30 min. Pseudo-second-order kinetic model and Langmuir isotherm explained well the Cr(VI) adsorption onto ZnO nanorods. The Cr(VI) adsorption onto ZnO was spontaneous and endothermic in nature. In view of promising adsorption efficiency, ZnO nanorods could possibly be used for Cr(VI) ions removal from wastewater and also extendable for the adsorption of other heavy metals ions.
关键词： ZnO nanorods,Cr(VI) adsorption,hydrothermal synthesis,Cr(VI) removal,wastewater
更新于2025-09-09 09:28:46
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Synthesis of band-gap tunable earth-abundant CXTS (X= Mn+2, Co+2, Ni+2 and Zn+2) nanorods: Toward a generalized synthesis strategy of quaternary chalcogenides
摘要： Quaternary structured Cu2XSnS4 (CXTS) nanostructures are important semiconductor materials for energy applications due to their excellent properties such as being earth abundant elements, nontoxic nature and easy production. Here, we first report a general process for the synthesis of quaternary CXTS nanorods by the simple and inexpensive hot-injection method. The chemical structure, morphology, optical, and thermal properties of the CXTS were investigated by XRD, TEM, UVeVis, FTIR and TGA techniques. These results clearly show that the obtained materials have the same crystal structure and are shaped as nanorods with an average 10e40 nm edge length. This study shows that all of the CXTS nanorods can be synthesized by the same synthesis conditions through the simple and facile hot-injection process.
关键词： Cu2CoSnS4,Quaternary chalcogenides,Cu2NiSnS4,CXTS nanorods,Hot-injection
更新于2025-09-09 09:28:46
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Improved field emission from appropriately packed TiO2 nanorods: Designing the miniaturization
摘要： An improved electron field emission (FE) property from vertically aligned TiO2 nanorods (TNR) on conducting fluorine doped tin oxide coated glass substrate, prepared by hydrothermal technique, has been reported here. The TNRs having high aspect ratio with appropriate separation were prepared by optimizing the nucleation temperature. The TNR density has been optimized to cease the screening effect in closely packed nanorods. The well aligned rods have been designed so that the applied field is equally distributes on each rod to improve the electron emission. The morphology of the nanorod has been studied using scanning electron microscopy and observed FE current density-field response has been analysed within the frame work of Fowler-Nordheim modelling. Two orders of magnitude enhancement in the electric field has been observed for this kind of geometry giving improved turn on field and field enhancement factor of 0.2 V/m m and 37 thousands respectively.
关键词： Fowler-Nordheim modelling,Hydrothermal technique,Field emission,TiO2 nanorods,Field enhancement factor
更新于2025-09-09 09:28:46
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Diffusion-Driven Al-Doping of ZnO Nanorods and Stretchable Gas Sensors Made of Doped ZnO Nanorods/Ag Nanowires Bilayers
摘要： A crystal-damage-free nano-doping method, which utilized the vacuum drive-in diffusion of Al into ZnO nanorods, was developed. In this method, vertical ZnO nanorod arrays that were grown by chemical bath deposition beforehand were deposited with Al thin film and subsequently heat-treated under a high vacuum. At an optimum condition, the surface Al atoms were completely diffused into ZnO nanorods, resulting in Al-doped ZnO nanorods. Stretchable gas sensors were fabricated by sequentially drop-casting Al-doped ZnO nanorods and silver nanowires on PDMS substrate. The resistance and response of the sensor could be optimized through the elaborate control of relative densities of Al-doped ZnO nanorods and silver nanowires. The sensor showed a high response of 32.3% to 10 ppm of NO2 gas at room temperature, even under a large strain of 30%. The NO2-sensing mechanism of Al-doped ZnO nanorods/silver nanowires bilayer sensors is discussed on the basis of synergistic interplay of Al-doped ZnO nanorods and silver nanowires.
关键词： Al-doped ZnO nanorods,Stretchable gas sensors,bilayers,drive-in diffusion,silver nanowires
更新于2025-09-09 09:28:46