Jun-Zhang Su
Qingdao University
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Publication
Featured researches published by Jun-Zhang Su.
Journal of Materials Science: Materials in Electronics | 2014
Jinna Zhang; Yongcheng Zhang; Chaojing Lu; Wanneng Ye; Jun-Zhang Su
Dense relaxor ferroelectric 0.88Pb(Mg1/3Nb2/3)O3–0.12PbTiO3 (0.88PMN–0.12PT) ceramics with different La-doping contents (0, 1, 2 and 4xa0at.%) were sintered by using powders synthesized via a solid-state reaction route. The effects of La doping on the microstructures and electric properties of the 0.88PMN–0.12PT ceramics were investigated. It was found that the average grain size, remanent polarization Pr, coercive field Ec, Curie temperature Tc and leakage-current density J of the ferroelectric ceramics decrease significantly with increasing La doping content. The decrease in Pr, Ec and Tc can be understood in term of the fact that the substitution of Pb2+ ions by La3+ ions suppresses the long-range coupling of BO6 octahedrons, while the abatement in J can be explained according to the reduction of oxygen vacancies caused by La doping. By fitting the J–E curves, the conduction mechanism of the 0.88PMN–0.12PT ceramics is confirmed to be Ohmic conduction generated from oxygen vacancies. The dielectric and ferroelectric properties of 0.88PMN–0.12PT ceramics are tunable with manipulating the La doping content.
Journal of Nanoparticle Research | 2018
Xiang-Feng Wu; Hui Li; Jun-Zhang Su; Jia-Rui Zhang; Yan-Mei Feng; Jun-Cheng Pan; Ying Zhang; Li-Song Sun; Wei-Guang Zhang; Guo-Wen Sun
The In2.77S4 microspheres had been firstly fabricated by using polyethylene glycol (PEG) as the morphological modifier and then used to hybridize with In(OH)3 nanocubes by a simply depositional method. The structure, optical properties, morphology, chemical compositions, and charge carrier behaviors of the as-prepared In2.77S4/In(OH)3 composites were characterized, respectively. The methyl orange, tetracycline, rhodamine B, and Cr(VI) dilute solution were selected to evaluate their photocatalytic activities. Experimental results showed that In(OH)3 nanocubes could improve the photocatalytic activity and recyclability of the In2.77S4 microspheres under the visible light irradiation. With the usage of In(OH)3 increased, the photocatalytic efficiency of the hybrids was firstly increased and then decreased. When the mass ratios of In2.77S4 to In(OH)3 were 6:2, it reached the maximum of 100% in 15xa0min for methyl orange, obviously higher than 67.4% of In2.77S4 and 1.1% of In(OH)3. Meanwhile, it could also oxidize 85.6% of tetracycline in 20xa0min, 97.8% of rhodamine B in 7.5xa0min, and reduce 92.9% of Cr(VI) in 30xa0min under the visible light irradiation. Moreover, it could still degrade 91.7% of methyl orange solution after 3xa0cycles, which was much higher than 40.7% of In2.77S4 microspheres. In addition, the possible mechanism of enhancing photocatalytic properties was proposed.
Journal of Nanoscience and Nanotechnology | 2018
Xiang-Feng Wu; Chen-Xu Zhang; Yang Sun; Shi-Da Fu; Hui Li; Yi-Jin Wang; Jia-Rui Zhang; Jun-Zhang Su; Yi-Wei Wang; Kai-Yuan Wang
The nanosized Bi-doped SnO2/reduced graphene oxide 3D hybrids have been synthesized via one-step hydrothermal method. The structures, morphologies, photocatalytic activities of the as-prepared samples were discussed, respectively. The formation mechanism of the as-prepared hybrids was also proposed. Experimental results indicated that the usage amount of Bi2Sn2O7 obviously affected the photocatalytic performance of the as-prepared products. When it was 450 mg, the as-prepared sample possessed the band gap energy of 1.9 eV and the photocatalytic efficiency of 90% in 210 min for degradation of rhodamine B solution. In addition, triethylene tetramine and the as-prepared carbon hydrogel could act as reductant to synergistically reduce Bi2Sn2O7 into Bi-doped SnO2 particles during the formation of the hybrids.
Journal of Materials Science: Materials in Electronics | 2018
Xiang-Feng Wu; Hui Li; Jun-Cheng Pan; Yi-Jin Wang; Chen-Xu Zhang; Jun-Zhang Su; Jia-Rui Zhang; Ying Zhang; Wei-Guang Zhang; Li-Song Sun; Xiu-Guo Sun
The direct Z-scheme Ag2WO4/WS2 photocatalysts had been fabricated by using a deposition method. Experimental results indicated that WS2 nanosheets could improve the photocatalytic activity, light absorption and recyclability of Ag2WO4 under the visible light irradiation. The degradation efficiency of the as-obtained Ag2WO4/WS2 hybrids for rhodamine B displayed first increasing and then decreasing with increasing the usage of WS2 nanosheets. When the usage of WS2 was 15xa0wt%, in 120xa0min, it reached the maximum of 97.8%, which was higher than 17.8% of pure Ag2WO4. Moreover, after three cycles of the degradation, the as-prepared hybrids still possessed 94.4% of the degradation efficiency, which increased by 1211.1% compared with pure Ag2WO4. Moreover, superoxide and hydroxyl radicals played major role during the process of photocatalytic degradation. The enhanced photocatalytic activity could be ascribed to the formation of direct Z-scheme photocatalytic system between Ag2WO4 and WS2.
Journal of Materials Science: Materials in Electronics | 2018
Xiang-Feng Wu; Chen-Xu Zhang; Yu-duan Wang; Jun-Zhang Su; Jia-Rui Zhang; Yan-Mei Feng; Mi Zhang; Xin Tong; Wei-Guang Zhang; Xiu-Guo Sun
The Ag2CrO4/SnO2 n–n type heterojunction has been fabricated by coupling Ag2CrO4 particles with SnO2 nanorods via an in situ synthetic method. The photocatalytic degradation mechanism of the as-prepared heterojunction has also been discussed. Characterization results revealed that the as-fabricated Ag2CrO4/SnO2 composites could reinforce the photo-degradation competencies for rhodamine B dilute solution compared to pure Ag2CrO4 and SnO2 samples. As the increase in the molar ratios of Ag2CrO4–SnO2, the photocatalytic degradation efficiency appeared to the tendency of first increasing and then decreasing. When it was 4:10, in 90xa0min, the as-obtained samples possessed the vintage photocatalytic degradation efficiency of 95.8% among of pure SnO2, Ag2CrO4 and the as-prepared composites with various molar ratios, respectively. Furthermore, the Ag2CrO4 and SnO2 were connected via chemical bonds to form the homogenous heterojunction. It could boost the separation and transfer of the photogenerated holes and electrons. In addition, the holes, hydroxyl and superoxide radicals played a major role during the photodegradation process.
Journal of Macromolecular Science, Part B | 2018
Xiang-Feng Wu; Yong-Ke Zhao; Xiao-Jun Li; Yi-Jin Wang; Chen-Xu Zhang; Jun-Zhang Su; Jia-Rui Zhang; Kai-Yuan Wang; Yi-Wei Wang; Mi Zhang
ABSTRACT Hexagonal boron nitride was adopted as a heterogeneous nucleation agent to fabricate polyamide 6 based nanocomposite films via a solution casting method. Isothermal crystallization behaviors of the as-prepared films were measured by using differential scanning calorimetry. Results showed that both the crystallization temperature and fillers loading greatly affected the crystallization process of the as-prepared samples. The crystallization nucleation and growth mechanism did not change during the initial stage of crystallization. The halftime of crystallization gradually increased with increasing crystallization temperature. Moreover, it decreased first and then increased with increasing the fillers loading at low crystallization temperature, while it decreased gradually at high crystallization temperature. Furthermore, the crystallization activation energy of the as-prepared samples gradually decreased with increasing fillers loading.
Applied Physics A | 2017
Xiang-Feng Wu; Hui Li; Yang Sun; Yi-Jin Wang; Chen-Xu Zhang; Jun-Zhang Su; Jia-Rui Zhang; Fei-Fei Yang; Ying Zhang; Jun-Cheng Pan
Journal of Alloys and Compounds | 2018
Xiang-Feng Wu; Yang Sun; Hui Li; Yi-Jin Wang; Chen-Xu Zhang; Jia-Rui Zhang; Jun-Zhang Su; Yi-Wei Wang; Ying Zhang; Chao Wang; Mi Zhang
Micro & Nano Letters | 2017
Hui Li; Xiang-Feng Wu; Mai-Tuo Yu; Yi-Jin Wang; Chen-Xu Zhang; Jun-Zhang Su; Jia-Rui Zhang; Ying Zhang; Jun-Cheng Pan; Chao Wang; Yan-Mei Feng
Journal of Alloys and Compounds | 2017
D.J. Zhang; Jun-Zhang Su; Chaojing Lu; Yongcheng Zhang; C. Zhang; Yanhui Li; Linyan Feng