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Li B.-J.,Jiangsu University | Li H.,Jiangsu University | Huang L.-J.,Jiangsu University | Cao H.-D.,Jiangsu University | And 5 more authors.
Ceramics International | Year: 2017

Commercial fluorine-doped tin oxide (FTO) thin films were subjected to laser annealing coupled with ultrasonic vibration (48 kHz and 350 W). The effects of ultrasonic vibration, laser fluence and defocusing amount were systematically studied. Laser annealing could result in grain growth or damage of the FTO layer, and introducing ultrasonic vibration during laser annealing could effectively enhance the film compactness, decrease the film thickness and refine the grains in the film. As a result, the optical and electrical properties of the ultrasonic-vibration-assisted laser-annealed FTO films were significantly improved by using low laser fluences and high defocusing amounts, and were slightly deteriorated when high laser fluences and low defocusing amounts were adopted. The results indicated that the film obtained by ultrasonic-vibration-assisted laser annealing using a laser fluence of 0.6 J/cm2 and a defocusing amount of 2.0 mm had the best overall photoelectric property with an average transmittance of 84.1%, a sheet resistance of 8.9 Ω/sq and a figure of merit of 1.99×10–2 Ω–1, outperforming that of the film obtained by pure laser annealing using the same experimental parameters. The present study confirms the efficacy of ultrasonic-vibration-assisted laser annealing in optimizing performance of FTO films. © 2017 Elsevier Ltd and Techna Group S.r.l.


Li B.-J.,Jiangsu University | Li H.,Jiangsu University | Huang L.-J.,Jiangsu University | Ren N.-F.,Jiangsu University | Kong X.,Jiangsu Tailong Reduction Box Co.
Applied Surface Science | Year: 2016

A facile and highly-efficient laser scanning process coupled with a simple silanization modification was used to prepare textured titanium (Ti) surfaces with stable superhydrophilicity and superhydrophobicity. Femtosecond pulsed laser scanning along two mutually perpendicular directions led to the formation of binary structures featuring micrometer-scale spikes covered with nanometer-scale ripples. The period of the spikes significantly increased and the period of the ripples irregularly changed in the narrow range of 550–600 nm with the increase of laser fluence. The obtained laser-textured Ti surfaces were hydrophilic or even superhydrophilic, and the superhydrophilic laser-textured Ti surface using a laser fluence of 1.5 J/cm2 was observed to retain its wetting property after 30 days of storage in ambient atmosphere. After silanization, all the laser-textured Ti surfaces exhibited high hydrophobicity or superhydrophobicity, and the superhydrophobic laser-textured Ti surfaces using laser fluences of 1.5 and 1.8 J/cm2 remained stable when stored in air for over 30 days. The results imply the potential applications of these surfaces in a variety of fields. © 2016 Elsevier B.V.


Li B.-J.,Jiangsu University | Huang L.-J.,Jiangsu University | Ren N.-F.,Jiangsu University | Kong X.,Jiangsu Tailong Reduction Box Co. | And 2 more authors.
Applied Surface Science | Year: 2015

Nickel-coated fluorine-doped tin oxide (Ni/FTO) thin films were prepared by sputtering Ni layers on commercial FTO glass. The as-prepared Ni/FTO films underwent nanosecond pulsed laser annealing in an external magnetic field (0.4 T). The effects of the presence of magnetic field and laser fluence on surface morphology, crystal structure and photoelectric properties of the films were investigated. All the films displayed enhanced compactness after magnetic-field-assisted laser annealing. It was notable that both crystallinity and grain size of the films gradually increased with increasing laser fluence from 0.6 to 0.9 J/cm2, and then decreased slightly with an increase in laser fluence to 1.1 J/cm2. As a result, the film obtained by magnetic-field-assisted laser annealing using a fluence of 0.9 J/cm2 had the best overall photoelectric property with an average transmittance of 81.2%, a sheet resistance of 5.5 Ω/sq and a figure of merit of 2.27 × 10-2 Ω-1, outperforming that of the film obtained by pure laser annealing using the same fluence. © 2015 Elsevier B.V.


Li B.-J.,Jiangsu University | Huang L.-J.,Jiangsu University | Ren N.-F.,Jiangsu University | Kong X.,Jiangsu Tailong Reduction Box Co. | And 2 more authors.
Journal of Alloys and Compounds | Year: 2016

A ZnO nanorod-coated FTO film was prepared by sputtering an AZO layer on FTO glass, thermal annealing of the AZO/FTO film, and hydrothermal growth of ZnO nanorods at 70 °C on the annealed AZO/FTO film using zinc foils as zinc source. Two other ZnO nanorod-coated FTO films were also prepared by hydrothermal growths of ZnO nanorods on the FTO glass and the unannealed AZO/FTO film respectively for comparison purpose. The results were observed in detail using X-ray diffraction, scanning electron microscopy, water contact/sliding angle measurement, spectrophotometry and four-point probe measurement. The ZnO nanorods on the annealed AZO/FTO film were found to exhibit denser distribution and better orientation than those on the FTO glass and the unannealed AZO/FTO film. As a result, the ZnO nanorod-coated annealed AZO/FTO film demonstrated superhydrophobicity, high transparency and low reflectance in the visible range. Also this film had the lowest sheet resistance of 4.0 Ω/sq, implying its good electrical conductivity. This investigation provides a valuable reference for developing multifunctional transparent conductive films. © 2016 Elsevier B.V. All rights reserved.


Li B.-J.,Jiangsu University | Huang L.-J.,Jiangsu University | Ren N.-F.,Jiangsu University | Kong X.,Jiangsu Tailong Reduction Box Co. | And 2 more authors.
Journal of Alloys and Compounds | Year: 2015

A two-step strategy, i.e. sputtering Ni layers on FTO glass combined with magnetic-field-assisted laser irradiation, was proposed to prepare laser-textured Ni/FTO bilayer composite films. By analyzing surface morphology, crystal structure and photoelectric properties of Ni/FTO films with different Ni layer thicknesses, the Ni/FTO film with a 10-nm-thick Ni layer (Ni10/FTO film), which had the best overall photoelectric property, was chosen to undergo magnetic-field-assisted laser irradiation with different laser fluences. Magnetic-field-free laser irradiation of the Ni10/FTO film was also carried out for comparison purpose. It was found that magnetic-field-assisted laser irradiation using a fluence of 1.0 J/cm2 was more effective for simultaneously achieving texturing and annealing, resulting in formation of ideal grating textures and significantly increased grain size. The corresponding film (MLI-NF1.0 film) showed the highest figure of merit of 22.8 × 10-3 Ω-1 compared to 13.1 × 10-3 Ω-1 of the FTO glass and 1.4 × 10-3 Ω-1 of the Ni10/FTO film, suggesting that the two-step strategy is excellent for preparing textured Ni/FTO films with high photoelectric properties. © 2015 Elsevier B.V. All rights reserved.

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