Xinying Shi
University of Oulu
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Publication
Featured researches published by Xinying Shi.
ACS Omega | 2017
Meng Zhang; Xinying Shi; Xiao Wang; Taohai Li; M. Huttula; Youhua Luo; Wei Cao
As an improvement over organic or inorganic layered crystals, the synthetic monolayer ZnO(M) inherits semiconductivity and hostability from its bulk, yet it acts as a promising host for dilute magnetic semiconductors. Here, we report the electronic and magnetic properties of ZnO(M) doped with one 3d transition metal ion and simultaneously adsorbed with another 3d transition metal ion. Two sequences are studied, one where the dopant is fixed to Mn and the adsorbate is varied from Sc to Zn and another where the dopant and adsorbate are reversed. First-principles results show that the stable adsorbed−doped systems possess a lower bandgap energy than that of the host. System magnetic moments can be tuned to |5 – x|μB, where x refers to the magnetic moment of the individual 3d atom. An interplay between superexchange and direct exchange yields a ferromagnetic system dually adsorbed−doped with Mn. In addition to a novel material design route, the magnetic interaction mechanism is found beyond two dimensions, having been identified for its three-dimensional bulk and zero-dimensional cluster counterparts.
Small | 2018
Xinying Shi; Sergei Posysaev; M. Huttula; Vladimir Pankratov; J. Hoszowska; Jean Claude Dousse; Faisal Zeeshan; Yuran Niu; Alexei Zakharov; Taohai Li; Olga Miroshnichenko; Meng Zhang; Xiao Wang; Zhongjia Huang; Sami Saukko; Diego López González; Sebastiaan van Dijken; M. Alatalo; Wei Cao
A critical factor for electronics based on inorganic layered crystals stems from the electrical contact mode between the semiconducting crystals and the metal counterparts in the electric circuit. Here, a materials tailoring strategy via nanocomposite decoration is carried out to reach metallic contact between MoS2 matrix and transition metal nanoparticles. Nickel nanoparticles (NiNPs) are successfully joined to the sides of a layered MoS2 crystal through gold nanobuffers, forming semiconducting and magnetic NiNPs@MoS2 complexes. The intrinsic semiconducting property of MoS2 remains unchanged, and it can be lowered to only few layers. Chemical bonding of the Ni to the MoS2 host is verified by synchrotron radiation based photoemission electron microscopy, and further proved by first-principles calculations. Following the systems band alignment, new electron migration channels between metal and the semiconducting side contribute to the metallic contact mechanism, while semiconductor-metal heterojunctions enhance the photocatalytic ability.
Scientific Reports | 2017
Yan Lu; Xinying Shi; Zhongjia Huang; Taohai Li; Meng Zhang; Jakub Czajkowski; Tapio Fabritius; M. Huttula; Wei Cao
In this work, we present laser coloration on 304 stainless steel using nanosecond laser. Surface modifications are tuned by adjusting laser parameters of scanning speed, repetition rate, and pulse width. A comprehensive study of the physical mechanism leading to the appearance is presented. Microscopic patterns are measured and employed as input to simulate light-matter interferences, while chemical states and crystal structures of composites to figure out intrinsic colors. Quantitative analysis clarifies the final colors and RGB values are the combinations of structural colors and intrinsic colors from the oxidized pigments, with the latter dominating. Therefore, the engineering and scientific insights of nanosecond laser coloration highlight large-scale utilization of the present route for colorful and resistant steels.
Applied Physics Letters | 2017
Henri Pauna; Xinying Shi; M. Huttula; Esko Kokkonen; Taohai Li; Youhua Luo; Jyrki Lappalainen; Meng Zhang; Wei Cao
Accurate knowledge of the oxidation stages of lithium is crucially important for developing next-generation Li-air batteries. The intermediate oxidation stages, however, differ in the bulk and cluster forms of lithium. In this letter, using first-principles calculations, we predict several reaction pathways leading to the formation of Li3O+ superatoms. Experimental results based on time-of-flight mass spectrometry and laser ablation of oxidized lithium bulk samples agreed well with our theoretical calculations. Additionally, the highest occupied molecular orbital-lowest unoccupied molecular orbital gap of Li3O+ was close to the energy released in one of these reaction paths, indicating that the superatom could act as a candidate charge-discharge unit.
Proceedings of the Estonian Academy of Sciences | 2016
Zhongjia Huang; Congcong Cai; Xinying Shi; Taohai Li; M. Huttula; Wei Cao
Gifted with unique optical and hydrophobic properties, the plant leaves have been recently considered as micro/ nanostructure prototypes for functional surface engineering. Imprinting bio-inspired structures onto surfaces can yield in similar functional properties than in the nature. In this article, we report on a simple and effective method to copy leaf surface structures onto poly-(methyl methacrylate) sheets. The replicated surface structures reduce optical reflectance and enhance optical haze. Besides, the artificial polymer sheets exhibit good hydrophobic properties. Correlation between optical haze and hydrophobicity was studied.
Materials Chemistry and Physics | 2015
Wei Cao; Vladimir Pankratov; M. Huttula; Xinying Shi; Sami Saukko; Zhongjia Huang; Meng Zhang
Crystals | 2018
Xinying Shi; Zhongjia Huang; M. Huttula; Taohai Li; Suya Li; Xiao Wang; Youhua Luo; Meng Zhang; Wei Cao
Small | 2018
Xinying Shi; Sergei Posysaev; M. Huttula; Vladimir Pankratov; J. Hoszowska; Jean-Claude Dousse; Faisal Zeeshan; Yuran Niu; Alexei Zakharov; Taohai Li; Olga Miroshnichenko; Meng Zhang; Xiao Wang; Zhongjia Huang; Sami Saukko; Diego López González; Sebastiaan van Dijken; M. Alatalo; Wei Cao
Microscopy and Microanalysis | 2018
Xinying Shi; M. Huttula; Vladimir Pankratov; J. Hoszowska; Jean-Claude Dousse; Faisal Zeeshan; Yuran Niu; Alexei Zakharov; Zhongjia Huang; Gang Wang; Sergei Posysaev; Olga Miroshnichenko; M. Alatalo; Wei Cao
Metals | 2018
Gang Wang; Daoyuan Pan; Xinying Shi; M. Huttula; Wei Cao; Yongjiang Huang