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Preparation and growth mechanism of CdS quantum dots in octadecene/glycerol two-phase systems
摘要： Two-phase synthesis is an advantageous alternative to the traditional synthetic method, due to its less toxicity, controllable, mild synthetic conditions and easy large-scale synthesis. However, meeting novel synthesis, the conventional trial-and-error approach could not provide a clear understanding. We herein report synthesis and mechanism investigation of CdS quantum dots in octadecene/glycerol two-phase system. The effects of different reaction parameters and conditions including reaction temperature, reaction time, reactant concentrations, and synthesis routes (one-step and two-step approach) on both nucleation and particle growth were investigated. It was found that the synthesis course was a growth dominated process depending on both CdS(monomer) and CdS (nuclei), and controlled by the interface of ODE/glycerol. The present work provided a new and clear understanding about two-phase system synthesis on semiconductor quantum dots, noble metal nanocrystals and some alloy nanomaterials.
关键词： Octadecene/glycerol two-phase systems,Growth mechanism,CdS quantum dots,One-step synthesis
更新于2025-09-16 10:30:52
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Effects of TiCl4 post-treatment on the performance of hole transport material-free, screen printable mesoscopic perovskite solar cells with carbon electrode
摘要： The prevention of current leakage in perovskite solar cells is an effective method for improving performance of devices. In this work, we treated a surface of TiO2 compact layer by the way of hydrolyzing TiCl4 aqueous solution and have investigated the influence of TiCl4 post-treatment on the performance of hole transport material-free, screen printable mesoscopic perovskite solar cells with carbon electrode. The device, which fabricated by TiO2 compact layer post-treated with TiCl4 aqueous solution for 50 min, has achieved highest device performance, with a short-circuit current density of 23.28 mA cm-2, an open circuit voltage of 0.98 V, a fill factor of 0.65 and the power conversion efficiency of 14.83%. The improved device performance is attributed to inhibition of charge recombination at the fluorine-doped tin oxide/perovskite interface and improvement of charge transport ability of the TiO2 compact layer by TiCl4 post-treatment.
关键词： Hole transport material-free,Chemical bath deposition,Titanium tetrachloride post-treatment,One-step deposition,Perovskite solar cells
更新于2025-09-12 10:27:22
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10% efficiency Cu(In,Ga)Se2 solar cell with strongly (220)/(204) oriented Cu-poor absorber layers sputtered using single quaternary target
摘要： Cu-poor CIGS thin films were fabricated by RF magnetron sputtering from a single quaternary target with the composition of Cu0.7In0.7Ga0.3Se2, in an effort to improve the cell efficiency of CIGS solar cells. The Cu-poor thin films with the ([Cu]/[In]t[Ga]) composition ratios of 0.70e0.77 were obtained showing that the composition of the target can be transferred to the film. It was also observed that the strongly (220)/(204) preferred orientation appeared at the substrate temperatures higher than 600 (cid:2)C, which is known to be essential for achieving high-quality CIGS solar cells. This result indicates that the CueSe compounds present in trace amounts of CIGS films hinder the (112) orientation and promotes the growth of the (220) orientation. As a result, the CIGS absorber layer with the Cu-poor composition and the (220)/(204) preferred orientation exhibited a drastically improved cell efficiency of 10.02%.
关键词： Quaternary single target,CIGS,Cu-poor composition,One-step sputtering
更新于2025-09-12 10:27:22
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Nanostructured Au(111)/Oxide Epitaxial Heterostructures with Tailoring Plasmonic Response by a One-Step Strategy
摘要： In this work we present a strategy for developing epitaxial incommensurate nanostructured-Au/oxide heterostructures with tuneable plasmonic response. Previously high quality single phase and oriented α-Fe2O3(0001) thin films were achieved, which have been used as a template for the noble metal epitaxial deposition. The complex systems have been grown by pulsed laser deposition on two different type of oxide substrates: α-Al2O3(0001) and SrTiO3(111). A one-step procedure has been achieved tailoring the isolated character and the morphological features of Au nanostructures through the substrate temperature during the Au growth, without altering the structural characteristics of the hematite layer that is identified as single iron oxide phase. The epitaxial character and the lattice coupling of Au/oxide bilayers are mediated through the sort of oxide substrate. Single oriented Au(111) islands are disposed with a rotation of 30o between their crystallographic axes and those of α-Fe2O3(0001). The Au(111) and SrTiO3(111) lattices are collinear while a rotation of 30o happens respect to the α-Al2O3(0001) lattice. The crystallographic domain size and crystalline order of hematite structure and Au nanostructured-layer are dependent on the substrate type and the Au growth temperature respectively. Besides, the functional character of the complex systems has been tested. The localized surface plasmons related to Au nanostructures are excited and controlled through the fabrication parameters, tuning the optical resonance with the degree of Au nanostructuring.
关键词： Tailoring Plasmonic Response,Oxide Epitaxial Heterostructures,Nanostructured Au,One-Step Strategy,Plasmonics,Hybrid Materials,Optical,Magnetic
更新于2025-09-12 10:27:22
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Highly Sensitive Ammonia Sensors Based on Ag-Decorated WO <sub/>3</sub> Nanorods
摘要： In this paper, WO3 nanorods are successfully synthesized via a one-step hydrothermal method, and then, silver nanoparticles are deposited on the WO3 surface by in situ photoreduction method to obtain Ag/WO3 gas sensitive materials. WO3 and Ag/WO3 are characterized by scanning electron microscope techniques, transmission electron microscope, and X-ray diffraction. The experimental results indicated that Ag nanoparticles have an important effect on the gas response of WO3 . The Ag/WO3 sensor greatly improves the selectivity and response compared to the traditional WO3 sensor; the response is 300 for 100 ppm ammonia when the Ag/WO3 sensor operates at the optimum operating temperature. The Ag/WO3 sensor can respond to 50 ppb ammonia.
关键词： nanoparticle,One-step hydrothermal method,gas sensing mechanism,high sensitivity
更新于2025-09-10 09:29:36
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Hydroxy-carbonate-assisted synthesis of high porous graphitic carbon nitride with broken of hydrogen bonds as a highly efficient visible-light-driven photocatalyst
摘要： Graphite carbon nitride (g-C3N4) is a promising candidate as an efficient, affordable, and sustainable alternative photocatalyst owing to its unique physical and chemical properties. However, the photocatalytic activity of pristine g-C3N4 is still far below what is expected, because of its insufficient active site and high electron-hole recombination rates. Herein, we develop a novel strategy ― a one-step hydroxy-carbonate-assisted route ― to try to overcome these disadvantages in g-C3N4 nanosheets by creating substantial pores ranging from mesoporous to macropore, which are mainly caused by the partial breaking of hydrogen bonds and removing of magnesium oxide. Luxuriant pores in g-C3N4 not only serve as a reaction center by providing a large number of active sites at pore edges, but also effectively improve the photogenerated carrier separation by shortening their transfer lengths. The highly efficient visible-light photocatalytic activity of porous g-C3N4 nanosheets are demonstrated by degrading methyl blue (MB) and gentian violet (GV) as models, which its degradation rate constant is respectively more than 109 times and 12 times higher than those of pristine g-C3N4. Meanwhile, the high porous g-C3N4 has robust stability. The simple and effective strategy proposed here provides a direct route to highly functionalized g-C3N4 nanosheets and other layered semiconductors for various applications.
关键词： transfer of electrons,one-step route,high porous g-C3N4,hydroxy-carbonate-assisted route,photocatalysis
更新于2025-09-04 15:30:14