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Highly sensitive ethanol gas sensor based on ultrathin nanosheets assembled Bi_2WO_6 with composite phase

Science Bulletin 2019年第9期64卷 595-602页

作者： Tongwei Yuan Zhijun Li Wenshuang Zhang Zhenggang Xue Xiaoqian Wang Zhiheng Ma Yu Fan Jiaqiang Xu Yuen Wu New Energy and Sensing Technology Laboratory Department of ChemistryCollege of ScienceShanghai University Provincial Key Laboratory of Oil & Gas Chemical Technology College of Chemistry and Chemical EngineeringNortheast Petroleum University Department of Chemistry iChEM (Collaborative Innovation Center of Chemistry for Energy Materials)University of Science and Technology of China

Bismuth tungstate(Bi2 WO6) has many intriguing properties and has been the focus of studies in a variety of fields, especially photocatalysis. However, its application in gas-sensing has been seldom ***, we successfully synthesized assembled hierarchical Bi2 WO6 which consists of ultrathin nanosheets with crystalline-amorphous composite phase by a one-step hydrothermal method. X-ray diffraction(XRD), X-ray photoemission spectroscopy(XPS), field-emission scanning electron microscopy(FESEM),and high-resolution transmission electron microscopy(HRTEM) techniques were employed to characterize its composition, morphology, and microstructure. By taking advantage of its unique microstructure,phase composition, and large surface area, we show that the resulting Bi2 WO6 is capable of detecting ethanol gas with quick response(7 s) and recovery dynamic(14 s), extremely high sensitivity(Ra/Rg= 60.8@50 ppm ethanol) and selectivity. Additionally, it has excellent reproducibility and long-term stability(more than 50 d). The Bi2 WO6 outperform the existing Bi2 WO6-based and most of the other state-of-the-art sensing platforms. We not only provided one new member to the field of gas sensor,but also offered several strategies to reconstruct nanomaterials.

关键词： Bi2WO6 Nanosheets assembled structure Composite phase Gas sensor Ethanol detection

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Distribution of Ge Self-assembled Quantum Dots on Six Ge1 - x Buffer Layers

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Journal of Rare Earths 2004年第z2期22卷 133-135页

作者： Joonyeon Chang Hyungjun Kim Nano Device Research Center Korea Institute of Science and TechnologySeoul 136-791Korea Department of Electrical EngireeringUniversity of California LosAngelesCA 90095-1595USA

The effect of buried misfit dislocation on the distribution of Ge self-assembled quantum dots (SAQDs) grown on a relaxed SiGe buffer layer was investigated. The strain field of arrays of buried dislocations in a relaxed SiGe buffer layer provided preferential nucleation sites for quantum dots. Burgers vector analysis using plan-view transmission electron microscopy (TEM) verified that the preferential nucleation sites of Ge SAQDs depended on the Burgers vector direction of corresponding dislocations. The measurement of the lateral distance between SAQDs and dislocations together with crosssection TEM observation clarified that the location of SAQDs was at the intersection of the dislocation slip plane and the top surface. The misfit strain should be an additional factor governing the uniformity in size, shape and distribution of Ge SAQDs.

关键词： misfit dislocation Ge self assembled quantum dots molecular beam epitaxy transmission electron microscopy

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Self　assembled　Monolayer　Films　of　C_（60）　on　O，O＇－Bis（2－aminoethyl）dithiophos　Modified　Copper

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Chinese Chemical Letters 1996年第12期7卷 1135-1138页

作者： Xiao Yu CHEN Yu HAN Ling QI Zheng XU(Coordinahon Chemistry Institute, the State Key Laboratory of Coordination Chemistry,Naming University, Nanjing 210093)Lan Sun ZHENG(Department of Chemistry, Xiamen University, Xiaxnen, 361005) Coordination Chemistry Institute State Key Lab. of Coord. Chemistry Nanjing University Nanjing 210093 Department of Chemistiy Xiamen University Xiamen 361005

On the surface of O,O'-bis(2-aminoethyl) dithiophosphate modified copper C60forms self-assembled monolayer films (SAMs) through the chemical bond. The film was characterized by contact angle, X-ray photoelectron spect... 详细信息

关键词： Films assembled

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Synthesis of GoldMag particles with assembled structure and their applications in immunoassay

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Science China Chemistry 2006年第6期49卷 534-540页

作者： CUI Yali1, ZHANG Lianying1, SU Jing1, ZHANG Caifeng3, LI Qi2, CUI Ting3, JIN Boquan2 & CHEN Chao1,3 1. Biochip Research and Development Center, Northwest University (National Engineering Research Center for Miniaturized Detection System), Xi’an 710069, China 2. Department of Immunology, The Fourth Military Medical University, Xi’an 710032, China 3. Shaanxi Lifegen Co., Ltd., Xi’an 710069, China Biochip Research and Development Center Northwest University (National Engineering Research Center for Miniaturized Detection System) Xi’an China Shaanxi Lifegen Co. Ltd. Xi’an China Department of Immunology The Fourth Military Medical University Xi’an China

Micrometer-sized Fe3O4 particles and nano-sized gold particles were first synthesized by methods of self-aggregation of surface-chemically modified Fe3O4 nanoparticles and citrate reduction of the Au3+ to Au0, respectively. Interaction between these two types of particles resulted in the assembly of nano-sized gold particles on the surface of the micrometer-sized Fe3O4 particles, forming an assembled structure with the Fe3O4 core particles around which are attached nano-sized gold parti- cles. The Fe3O4/Au structure is named GoldMag particles with assembled structure. The synthetic process, structure, and magnetic property of the GoldMag particles were analyzed. GoldMag particles with assembled structure have an irregular shape, rough surface with a diameter of 2―3 μm. These particles exhibit the superparamagnetic property with saturated magnetization of 41 A·m2/kg. In a single step, antibodies could be readily immobilized onto the surface of the particles with a high binding capacity. The GoldMag particles can be used as a novel carrier in immunoassays. The maximum quantity of human IgG immobilized onto GoldMag particles was 330 μg/mg. In order to validate the quality of the GoldMag particles as immunoassay carriers, an immunoassay system was used. The relative amount of immobilized human IgG was measured by HRP-labeled anti human IgG. The coefficient of variation within parallel samples of each group was below 6% and the coefficient of variation of means between five groups carried out separately was below 7%. Based on the sandwich method, the Hepatitis B surface antigen (HBsAg) and interleukin-8 (IL-8) were also analyzed by qualitative and quantitative detection, respectively. The result indicated that the GoldMag particles with assembled structure were an ideal carrier in immunoassay.

关键词： GoldMag particles with assembled structure, synthesis, carrier, immunoassay.

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Application of virtual material in joint surface of complex assembled structures

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Journal of Central South University 2008年第S2期15卷 421-424页

作者：崔志琴景银萍 School of Mechatronic Engineering North University of China

In order to acquire the dynamic characteristics of joint surfaces of complex assembled structures, a novel parameter identification technique was adopted. Virtual materials were introduced to simulate the stiffness and damping features of the joint surfaces between two different structures. Properties of the virtual materials, including elasticity modulus, density, and Poisson ratio, were gradually modified. At last, FEM modal results of the assembled structures are consistent with the experimental ones. This proves the feasibility of the simulating method and paves a solid foundation of the further research of the dynamic simulation.

关键词： virtual materials vibration modal assembled structure joint surface

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Improvement of a SARS-CoV-2 vaccine by enhancing the conjugation efficiency of the immunogen to self-assembled nanoparticles

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Cellular & Molecular Immunology 2021年第8期18卷 2042-2044页

作者： Xiantao Zhang Yaochang Yuan Bolin Wu Xuemei Wang Yingtong Lin Yuewen Luo Rong Li Tao Chen Jieyi Deng Xu Zhang Fan Zou Xin He Hui Zhang Institute of Human Virology Key Laboratory of Tropical Disease Control of the Ministry of EducationGuangdong Engineering Research Center for Antimicrobial Agents and ImmunotechnologyEngineering Research Center of Gene Vaccines of the Ministry of EducationZhongshan School of MedicineSun Yat-Sen UniversityGuangzhou510080GuangdongChina Qianyang Biomedical Research Institute GuangzhouGuangdong510063China

To the Editor:Coronavirus disease 2019(COVID-19)has become a worldwide public health emergency,threatening public health and global stability[1].The development of a safe and effective vaccine is urgently needed to co... 详细信息

关键词： vaccine vaccines assembled

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A Theoretical Study of Light Absorption in Self assembled Quantum Dots

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Optics and Photonics Journal 2013年第2期3卷 243-247页

作者： Tarek A. Ameen Yasser M. El-Batawy A. A. Abouelsaood Department of Engineering Physics and Mathematics Faculty of Engineering Cairo University Giza 12613 Egypt

Self assembled quantum dots have shown a great promise as a leading candidate for infrared detection at room temperature. In this paper, a theoretical model of the absorption coefficient of quantum dot devices is presented. Both of bound to bound absorption and bound to continuum absorption are taken into consideration in this model. This model is based on the effective mass theory and the Non Equilibrium Greens Function (NEGF) formalism. NEGF formalism is used to calculate the bound to continuum absorption coefficient. The results of the model have been compared with a published experimental work and a good agreement is obtained. Based on the presented model, the bound to bound absorption coefficient component is compared to the bound to continuum absorption coefficient component. In addition, the effects of the dot dimensions and electron filling on the bound to continuum absorption coefficient are also investigated. In general, increasing the dot filling increases the absorption and decreasing the dots dimensions will increase the absorption and move the absorption peak towards longer wavelengths.

关键词： Absorption Coefficients Non Equilibrium Greens Function Self assembled Quantum Dots

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ISOTHERMAL PRECISION FORGING PROCESS OF ALUMINUM ALLOY CYLINDRICAL HOUSING

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中国有色金属学会会刊：英文版 1997年第3期7卷 124-127页

作者： Wang, Z Xue, KM Shan, DB Xu, FC Lu, Y HARBIN INST TECHNOL SCH MAT SCI & ENGNHARBIN 150001PEOPLES R CHINA

ＩＳＯＴＨＥＲＭＡＬＰＲＥＣＩＳＩＯＮＦＯＲＧＩＮＧＰＲＯＣＥＳＳＯＦＡＬＵＭＩＮＵＭＡＬＬＯＹＣＹＬＩＮＤＲＩＣＡＬＨＯＵＳＩＮＧ①ＷａｎｇＺｈｅｎ，ＸｕｅＫｅｍｉｎ，ＳｈａｎＤｅｂｉｎ，ＸｕＦｕｃｈａｎｇ，ＬｕＹ... 详细信息

ＩＳＯＴＨＥＲＭＡＬＰＲＥＣＩＳＩＯＮＦＯＲＧＩＮＧＰＲＯＣＥＳＳＯＦＡＬＵＭＩＮＵＭＡＬＬＯＹＣＹＬＩＮＤＲＩＣＡＬＨＯＵＳＩＮＧ①ＷａｎｇＺｈｅｎ，ＸｕｅＫｅｍｉｎ，ＳｈａｎＤｅｂｉｎ，ＸｕＦｕｃｈａｎｇ，ＬｕＹａｎＳｃｈｏｏｌｏｆＭａｔｅｒｉａ...

关键词： aluminum alloy isothermal precision forging assembled die heating range

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Optimizing solution of fault location using single terminal quantities

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Science China(Technological Sciences) 2008年第6期51卷 761-772页

作者： DONG XinZhou SHI ShenXing CUI Tao LU Qiang State key lab.Of power system Department of Electrical EngineeringTsinghua UniversityBeijing 100084China

This paper firstly evaluated the impedance method and traveling waves method for fault location, and studied the robustness of fault location method based on im-pedance. Then it proposed an assembled fault location method for a transmission line based on single-terminal electrical quantities, in which the fault zone was firstly determined by impedance method with robustness then the accurate fault position was pinpointed by traveling waves method. EMTP (Electromagnetic Transient Pro-gram) simulations showed that the proposed method can overcome the drawbacks of impedance method and traveling waves method when either one is used alone, and improve both the accuracy and the reliability of fault location.

关键词： transmission line accurate fault location traveling waves method impedance method assembled method

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High-quality chromosome-level genome assembly of Tibetan fox(Vulpes ferrilata)

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Zoological Research 2022年第3期43卷 362-366页

作者： Tian-Shu Lyu Qin-Guo Wei Li-Dong Wang Sheng-Yang Zhou Lu-Peng Shi Yue-Huan Dong Hua-Shan Dou Wei-Lai Sha Ta Ga Hong-Hai Zhang School of Life Science Qufu Normal UniversityQufuShandong 273165China Hulunbuir Academy of Inland Lakes in Northern Cold&Arid Areas Hulun BuirInner Mongolia 021000China Ecological Environment and Natural Resources Administration QumarlêbXizang 815500China

DEAR EDITOR,Using Oxford Nanopore and Hi-C sequencing technology,we successfully assembled a chromosome-level genome of the Tibetan fox(Vulpes ferrilata),with a total size of 2.38 Gb and N50 length of 133960477 *** 157 contigs were further assembled into 18 chromosomes with a sequence length of2378.42 Mb,accounting for 99.95%of the total length.

关键词： Tibetan lata assembled

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