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Start Over Author "Zhibing Zhan" Publisher american chemical society
6 results on '"Zhibing Zhan"'

3. Femtosecond-Laser-Produced Underwater 'Superpolymphobic' Nanorippled Surfaces: Repelling Liquid Polymers in Water for Applications of Controlling Polymer Shape and Adhesion

Author

Subhash C. Singh, Mohamed EIKabbash, Chunlei Guo, Jiale Yong, Feng Chen, and Zhibing Zhan

Subjects
chemistry.chemical_classification, Microlens, underwater superpolymphobicity, Materials science, Polydimethylsiloxane, Microfluidics, Polymer, Adhesion, three-level microstructure, Article, polymer repellence, Contact angle, chemistry.chemical_compound, chemistry, Superhydrophilicity, femtosecond laser, Femtosecond, General Materials Science, Composite material, superhydrophilicity
Abstract

A femtosecond (fs)-laser-processed surface that repels liquid polymer in water is reported in this paper. We define this phenomenon as the "superpolymphobicity". Three-level microstructures (including microgrooves, micromountains/microholes between the microgrooves, and nanoripples on the whole surface) were directly created on the stainless steel surface via fs laser processing. A liquid polydimethylsiloxane (PDMS) droplet on the textured surface had the contact angle of 156 ± 3° and contact angle hysteresis less than 4° in water, indicating excellent underwater superpolymphobicity of the fs-laser-induced hierarchical microstructures. The contact between the resultant superhydrophilic hierarchical microstructures and the submerged liquid PDMS droplet is verified at the underwater Cassie state. The underwater superpolymphobicity enables to design the shape of cured PDMS and selectively avoid the adhesion at the PDMS/substrate interface, different from the previously reported superwettabilities. As the examples, the microlens array and microfluidics system were prepared based on the laser-induced underwater superpolymphobic microstructures.

Published
2019

6. Strategy for Preparing Al-Doped ZnO Thin Film with High Mobility and High Stability.

Author

Zhibing Zhan, Jiye Zhang, Qinghong Zheng, Danmei Pan, Jin Huang, Feng Huang, and Zhang Lin

Subjects
*ZINC oxide thin films, *DOPED semiconductors, *ALUMINUM, *MOLECULAR structure, *CRYSTAL lattices, *CHEMICAL vapor deposition, *ELECTRIC conductivity, *CHEMICAL processes
Abstract

Ideal Al-doped ZnO (AZO) thin films should have high carrier mobility and carrier concentration, as well as high thermal and chemical stability. To achieve these properties, ZnO should be heavily doped with Al and perfectly crystallized. Through analyzing the possible valence state of the elements and local lattice structures of AZO films during the gas-phase deposition process, we find that the current gas-phase deposition method may encounter an intrinsic obstacle that heavy doping of Al, high thermal stability, and high mobility (perfect crystallinity) cannot be achieved simultaneously. However, based on the understanding that an AZO thin film prepared in oxidizing atmosphere is actually accompanied with a high concentration of zinc vacancy, we propose a strategy to obtain an AZO film with ideal characteristics. Under an oxidizing atmosphere, a heavily doped AZO film with a high concentration of zinc vacancy is prepared using a gas-phase deposition method. Then a zinc vapor annealing treatment is employed to improve the crystallinity and conductivity of the film by filling the zinc vacancies with zinc atoms. The prepared AZO films possess the highest mobility (36.8 cm2V−1s−1) ever reported. Moreover, the films also show remarkable stability in carrier concentration, mobility, and resistivity under damp heat treatment (85 °C) over months. [ABSTRACT FROM AUTHOR]

Published
2011
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