Chunlong Xu

Bio: Chunlong Xu is an academic researcher from Chang'an University. The author has contributed to research in topics: Bilayer & Relaxation (physics). The author has an hindex of 3, co-authored 12 publications receiving 45 citations.

A versatile chemical conversion synthesis of Cu2S nanotubes and the photovoltaic activities for dye-sensitized solar cell

Abstract: A versatile, low-temperature, and low-cost chemical conversion synthesis has been developed to prepare copper sulfide (Cu2S) nanotubes. The successful chemical conversion from ZnS nanotubes to Cu2S ones profits by the large difference in solubility between ZnS and Cu2S. The morphology, structure, and composition of the yielded products have been examined by field-emission scanning electron microscopy, transmission electron microscopy, and X-ray diffraction measurements. We have further successfully employed the obtained Cu2S nanotubes as counter electrodes in dye-sensitized solar cells. The light-to-electricity conversion results show that the Cu2S nanostructures exhibit high photovoltaic conversion efficiency due to the increased surface area and the good electrocatalytical activity of Cu2S. The present chemical route provides a simple way to synthesize Cu2S nanotubes with a high surface area for nanodevice applications.

Cation exchange synthesis of CuS nanotubes composed of nanoparticles as low-cost counter electrodes for dye-sensitized solar cells

Abstract: In this work, CuS nanotubes composed of nanoparticles with relative high catalytic activity have been successfully synthesized via a facile conversion process from ZnS nanotubes precursors. The successful chemical conversion from ZnS nanotubes to CuS ones could be attributed to a cation exchange process which benefits by the large difference in solubility between ZnS and CuS. A possible formation mechanism and growth process of the CuS nanotubes is discussed based on the experimental results. The as-prepared CuS nanotubes were then used as counter electrodes (CEs) and demonstrated good performance in dye-sensitized solar cells (DSSCs). The good performance is attributed to the increased surface area and the good electrocatalytical activity of CuS. This approach can provide a potent technique to obtain inorganic materials with unique structures and chemical compositions.

Design and implementation of college physics teaching platform based on virtual experiment scene

Abstract: In the study of college physics, experiment is the source of students' discovery and exploration of problems, which plays a crucial role in college physics and is also the focus of physics teaching...

Compound Copper Chalcogenide Nanocrystals

Abstract: This review captures the synthesis, assembly, properties, and applications of copper chalcogenide NCs, which have achieved significant research interest in the last decade due to their compositional and structural versatility. The outstanding functional properties of these materials stems from the relationship between their band structure and defect concentration, including charge carrier concentration and electronic conductivity character, which consequently affects their optoelectronic, optical, and plasmonic properties. This, combined with several metastable crystal phases and stoichiometries and the low energy of formation of defects, makes the reproducible synthesis of these materials, with tunable parameters, remarkable. Further to this, the review captures the progress of the hierarchical assembly of these NCs, which bridges the link between their discrete and collective properties. Their ubiquitous application set has cross-cut energy conversion (photovoltaics, photocatalysis, thermoelectrics), en...

One-Step Solvothermal Synthesis of Petalous Carbon-Coated Cu+-Doped CdS Nanocomposites with Enhanced Photocatalytic Hydrogen Production

Abstract: Metal ion doping and nanocoating a CdS photocatalyst have been proven to be effective strategies to inhibit photocorrosion and improve photocatalytic performance. In this study, carbon-coated Cu+-doped CdS nanocomposites (C-Cu-CdS) with a stable petalous structure and highly uniform size distribution were successfully synthesized via a facile one-step solvothermal method. Both Cu+ doping and carbon coating to the CdS photocatalyst are realized in this one-step strategy. Benefiting from the unique core–shell structure and metal ion doping, the as-prepared C-Cu-CdS catalyst exhibits significantly enhanced photostability and visible-light-driven photocatalytic efficiency. For an optimal Cu+ doping percentage of 1.0%, an average hydrogen production rate of 2796 μmol h–1 g–1 and an apparent quantum efficiency of 16.0% at a wavelength of 420 nm was observed, the latter of which is nearly 9.3 times higher than that of the carbon-coated CdS product without Cu+ doping. The origin of the improved photocatalytic act...

Polyethylene Glycol-Functionalized Magnetic (Fe3O4) Nanoparticles: A Novel DNA-Mediated Antibacterial Agent

Abstract: The Fe3O4-PEG magnetic nanoparticles (NPs) were prepared by hydrothermal method at different concentrations (FeCl3·6H2O 0.75 mg/mL and FeCl3·6H2O 1.5 mg/mL) and subsequently surface-functionalized coating with polyethylene glycol (PEG), the successful coating of PEG molecules on the surface of Fe3O4. These magnetic NPs exhibited good dispersibility and dissolvability in physiological condition. The obtained magnetic nanoparticles were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared (FTIR) spectroscopy, thermogravimetry (TG) and vibrating sample magnetometer (VSM). The antibacterial activity of Fe3O4-PEG magnetic nanoparticles (MNPs) was studied against two bacterial strains: Gram-positive Staphylococcus and Gram-negative Escherichia coli aureus. The modified MNPs had a significant effect is more on S. aureus and less on E. coli. The results showed that polyethylene glycol-functionalized magnetic (Fe3O4) NPs as a novel DNA-mediated antibacterial agent.

Synthesis, modification and bioapplications of nanoscale copper chalcogenides

Abstract: Copper chalcogenides have a simple general formula, variable atomic ratios, and complicated crystal structures, which lead to their wealth of optical, electrical, and magnetic properties with great potential for wide applications ranging from energy conversion to the biomedical field. Herein, we summarize the recent advances in (1) the synthesis of size- and morphology tunable nanostructures by different methods; (2) surface modification and functionalization for different purposes; and (3) bioapplications for diagnosis and treatment of tumors by different imaging and therapy methods, as well as antibacterial applications. We also briefly discuss the future directions and challenges of copper chalcogenide nanoparticles in the biomedical field.