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Zhaolin Yuan,Junsheng Yu,Nana Wang,Yadong Jiang 한국물리학회 2012 Current Applied Physics Vol.12 No.5
A photodiode with planar heterojunction was fabricated using copper (II) phthalocyanine (CuPc) organic semiconductor and zinc oxide (ZnO) inorganic nanoparticles (NPs, ~5 nm). The currentevoltage (IeV)characteristics of ITO/ZnO NPs/CuPc/Ag device in dark and under illumination with a solar simulator were investigated in detail. The measurement results showed that the device exhibited good rectifying behavior in dark and under illumination. A rectification ratio (RR) of 15.44 at 1.95 V was achieved for the device under 100 mW/cm2 illumination power. Also, the RR of the device as a function of light intensity was observed. The photoresponsive mechanism of the photodiode was illuminated in term of its energy band diagram.
Preparation of Highly Visible-Light Photocatalytic Active N-Doped TiO<sub>2</sub> Microcuboids
Zhao, Kang,Wu, Zhiming,Tang, Rong,Jiang, Yadong Korean Chemical Society 2013 대한화학회지 Vol.57 No.4
N-doped $TiO_2$ microcuboids were successfully prepared by a simple one-pot hydrothermal method. The samples were characterized by X-ray diffraction, scanning electron microscopy, diffuse reflectance spectroscopy, and X-ray photoelectron spectroscopy. It was found that the N-doped $TiO_2$ microcuboids enhanced absorption in the visible light region, and exhibited higher activity for photocatalytic degradation of model dyes. Based on the experimental results, a visible light induced photocatalytic mechanism was proposed for N-doped anatase $TiO_2$ microcuboids.
Yuetao Zhao,Wenyao Yang,Yujiu Zhou,Yan Chen,Yajie Yang,Jianhua Xu,Yadong Jiang 대한금속·재료학회 2016 ELECTRONIC MATERIALS LETTERS Vol.12 No.6
The molecular weight shows great influence on dielectricand energy storage performance of poly(vinylidenefluoride) (PVDF) films and related devices. In this letter,the influences of molecular weight on the dielectric andenergy storage properties of PVDF films were studied. Ithas been found that, under a 1000 kV/cm electric field,the low-molecular-weight PVDF film presents a muchhigher energy storage efficiency as high as 80.10%,nearly three times as much as the high-molecular-weightPVDF film. Moreover, the low-molecular-weight PVDFfilm also shows high resistivity, representing an order ofmagnitude improvement over the high-molecular-weightPVDF film, which is more desirable and promising forhigh performance pulse discharge capacitor application.
Jifeng Yu,Xinlong Pang,Wenzhao Fu,Jason Hilton,Mingmei Liang,Zongkai Jiang,Xiuli Zhao,Wenyan Qiao,Suo Shi,Diandong Zhang,Huitao Cao,Haibo Jia,Yadong Wang,Xiaoke Hu,Rui Zhang 한국지질과학협의회 2021 Geosciences Journal Vol.25 No.5
The Miocene aged Shanwang Formation from the Shanwang National Geopark in China represents a succession of lacustrine diatomaceous shales containing an abundant and diverse biota with lagerstätte fossilization of soft tissues. To date, the Shanwang Formation has not been investigated for cyclostratigraphy nor has it been dated with high precision methods. Now we use thorium data as a paleoenvironmental and paleoclimatic proxy to conduct a detailed cyclostratigraphic analysis. A new and simple cyclostratigraphic method, Wavelet Scale Series Analysis (WSSA) is developed to recognize Milankovitch cycles. A total of three short eccentricity and fifteen precession cycles are identified; obliquity cycles are not apparent. In the sedimentary succession, the corresponding precession and short eccentricity cycles are 1.17 m and 4.98 m thick respectively, with this verified by Correlation Coefficient (COCO) analysis and Multitaper-Method (MTM) spectral analysis. We estimate the studied interval was deposited over a duration of 0.3 Myr with a depositional rate of c. 5.7 cm/kyr. Paleomagnetic and radio isotope dating data shows that the diatomaceous shale was deposited during Chron C5En, which places it at approximately 18.5 Ma during the Burdigalian stage of the Early Miocene, rather than in the Middle Miocene as previously thought. The Shanwang lagerstätte biota therefore predates the Middle Miocene Climate Optimum (MMCO) and did not form within it. The geological time scale with a high resolution of 20 kyr was set accordingly.