Search

Your search keyword '"Yan, Xiaoqin"' showing total 683 results
Start Over Author "Yan, Xiaoqin"
683 results on '"Yan, Xiaoqin"'

203. Leukostasis retinopathy: An uncommon visual threatening complication of chronic myeloid leukemia with severe hyperleukocytosis - A case report and review of the literature.

Author

Chen, Bo, Yan, Xiaoqin, Zhang, Xian, and Yang, Hong

Subjects
*CHRONIC myeloid leukemia, *RETINAL detachment, *OPHTHALMOLOGISTS, *VISION disorders, *DISEASE complications
Abstract

To describe a rare case of an unusual visual threatening complication of chronic myeloid leukemia (CML). A 21-year-old male visited the hospital complaining of 1-week painless binocular acute visual loss without any other symptoms. The patient was diagnosed with CML. He then received emergent leukapheresis with imatinib treatment, which achieved obvious hematological remission. However, the visual acuity did not recover along with the CML remission and ocular structure relief. CML-related leukostasis could induce severe leukostasis retinopathy. Hematologists and ophthalmologists should pay more attention to this relatively rare and severe complication of CML. [ABSTRACT FROM AUTHOR]

Published
2018
Full Text
View/download PDF

219. Efficient Yttrium(III) Chloride‐Treated TiO2 Electron Transfer Layers for Performance‐Improved and Hysteresis‐Less Perovskite Solar Cells.

Author

Li, Minghua, Huan, Yahuan, Yan, Xiaoqin, Kang, Zhuo, Guo, Yan, Li, Yong, Liao, Xinqin, Zhang, Ruxiao, and Zhang, Yue

Subjects
PEROVSKITE, SOLAR cells, YTTRIUM, CHARGE exchange, TITANIUM dioxide, METAL halides, PHOTOLUMINESCENCE, IMPEDANCE spectroscopy
Abstract

Abstract: Hybrid organic–inorganic metal halide perovskite solar cells have attracted widespread attention, owing to their high performance, and have undergone rapid development. In perovskite solar cells, the charge transfer layer plays an important role for separating and transferring photogenerated carriers. In this work, an efficient YCl3‐treated TiO2 electron transfer layer (ETL) is used to fabricate perovskite solar cells with enhanced photovoltaic performance and less hysteresis. The YCl3‐treated TiO2 layers bring about an upward shift of the conduction band minimum (ECBM), which results in a better energy level alignment for photogenerated electron transfer and extraction from the perovskite into the TiO2 layer. After optimization, perovskite solar cells based on the YCl3‐treated TiO2 layers achieve a maximum power conversion efficiency of about 19.99 % (19.29 % at forward scan) and a steady‐state power output of about 19.6 %. Steady‐state and time‐resolved photoluminescence measurements and impedance spectroscopy are carried out to investigate the charge transfer and recombination dynamics between the perovskite and the TiO2 electron transfer layer interface. The improved perovskite/TiO2 ETL interface with YCl3 treatment is found to separate and extract photogenerated charge rapidly and suppress recombination effectively, which leads to the improved performance. [ABSTRACT FROM AUTHOR]

Published
2018
Full Text
View/download PDF

227. Electronic Structure Engineering of Cu2O Film/ZnO Nanorods Array All-Oxide p-n Heterostructure for Enhanced Photoelectrochemical Property and Self-powered Biosensing Application

Author

Kang, Zhuo, primary, Yan, Xiaoqin, additional, Wang, Yunfei, additional, Bai, Zhiming, additional, Liu, Yichong, additional, Zhang, Zheng, additional, Lin, Pei, additional, Zhang, Xiaohui, additional, Yuan, Haoge, additional, Zhang, Xueji, additional, and Zhang, Yue, additional

Published
2015
Full Text
View/download PDF

237. Polarity-Dependent Piezotronic Effect and Controllable Transport Modulation of ZnO with Multifield Coupled Interface Engineering.

Author

Lin, Pei, Yan, Xiaoqin, Li, Feng, Du, Junli, Meng, Jingjing, and Zhang, Yue

Subjects
PIEZOELECTRIC materials, ZINC oxide, PHOTOEXCITATION, NANOPARTICLE synthesis, POLARITY (Physics), INTERFACES (Physical sciences)
Abstract

Interface engineering has emerged as a powerful approach for nanodevices performance manipulation. Nevertheless, most of previous work mainly focuses on interface modulation with single physical field, such as strain or light, little work has been reported on their coupling effect. Here, using patterned and polarity-controlled ZnO nanorods, the authors present a systematic multifield coupling investigation with photo-atomic force microscope, where an optical system is introduced and 355 nm UV laser with tunable power can precisely illuminate sample under conductive tip. Surface polarity-dependent tailoring of interfacial barrier is demonstrated, which verifies the dominant role of polar piezotronic effect. Furthermore, coupled modulation of piezopolarization and photoexcitation on local transport property is studied. Fine tuning of transport characteristics is achieved through subtly adjusting applied force and illumination power. The results offer an applicable method to realize tunable interface property with coupled external stimuli and can be potentially expanded to other noncentral symmetric structure nanowire or novel 2D layered piezoelectric materials. [ABSTRACT FROM AUTHOR]

Published
2017
Full Text
View/download PDF

239. Effect of carrier screening on ZnO-based resistive switching memory devices.

Author

Sun, Yihui, Yan, Xiaoqin, Zheng, Xin, Li, Yong, Liu, Yichong, Shen, Yanwei, Ding, Yi, and Zhang, Yue

Abstract

The carrier screening effect occurs commonly in dielectric materials. It reduces the electric potential gradient, thus negatively affecting the functionality of resistive random access memory (RRAM) devices. An Au/ZnO film/Al-doped ZnO device fabricated in this work exhibited no resistive switching (RS), which was attributed to the carrier screening effect. Therefore, annealing was used for alleviating the screening effect, significantly enhancing the RS property. In addition, different on/off ratios were obtained for various bias values, and the screening effect was accounted for by investigating electron transport mechanisms. Furthermore, different annealing temperatures were employed to modulate the free carrier concentration in ZnO films to alleviate the screening effect. The maximal on/off ratio reached 10 at an annealing temperature of 600 °C, yielding the lowest number of free carriers and the weakest screening effect in ZnO films. This work investigates the screening effect in RS devices. The screening effect not only modulates the characteristics of memory devices but also provides insight into the mechanism of RS in these devices. [ABSTRACT FROM AUTHOR]

Published
2017
Full Text
View/download PDF

240. Band alignment engineering for high-energy-density solid-state asymmetric supercapacitors with TiO2 insertion at the ZnO/Ni(OH)2 interface.

Author

Zheng, Xin, Yan, Xiaoqin, Sun, Yihui, Li, Yong, Li, Minghua, Zhang, Guangjie, and Zhang, Yue

Abstract

In this paper, an adaptive interface electronic band structure was proposed for improving the capacitance of nano-architectured Ni(OH)2 by introducing a TiO2 embedding layer at the ZnO/Ni(OH)2 interface. A stair-like band alignment was designed to reduce the electron interface transport barrier and induce efficient electron-injection through the interface to the reaction region when it is charging. Consequently, the activation energy of reduction dropped, which further brought about a decreased equilibrium potential (Eeq) depending on the Butler–Volmer model of electrode kinetics. As expected, a superior capacitance of 1981 F g−1 at 2 A g−1 was triggered. After that, this advanced electrode was assembled in an asymmetric cell with a ZnO@Fe2O3 based negative electrode; the as-fabricated device delivered a high energy density of 52.2 W h kg−1 at a power density of 1.3 kW kg−1 within the voltage range of 0–1.6 V as well as a good cycling performance (96.6% capacity retention after 5000 cycles). These features demonstrate that suitable interface engineering may open up new opportunities in the development of high-performance supercapacitors. [ABSTRACT FROM AUTHOR]

Published
2016
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results