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Tuning the inhomogeneous charge transport in ZnO interfaces for ultrahigh on/off ratio top-gated field-effect-transistor arrays

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Nano Research 2020年第11期13卷 3033-3040页

作者： Thanh Luan Phan Dinh Loc Duong Tuan Khanh Chau Sidi Fan Won Tae Kang Thi Suong Le Hyun Yong Song Linfeng Sun Van Tu Vu Min Ji Lee Quoc An Vu Young Hee Lee Woo Jong Yu Department of Electrical and Computer Engineering Sungkyunkwan UniversitySuwon16419Republic of Korea Center for Integrated Nanostructure Physics(CINAP) Institute for Basic Science(IBS)Suwon16419Republic of Korea Department of Energy science Sungkyunkwan UniversitySuwon16419Republic of Korea Department of Physics Sungkyunkwan UniversitySuwon16419Republic of Korea

The interface between oxide/oxide layers shows an inhomogeneous charge transport behavior,which reveals a high conductivity owing to *** typical example is the hetero-interface between ZnO film and other wide band gap oxides(e.g.,Al_(2)O_(3),TiO_(2),and HfO_(2)).It is thus quite evident that the ZnO/other oxides hetero-interface contains high density electron carriers effectively screening the gate-induced electric ***,an extremely weak gate modulation in ZnO film was showed,resulting in very low on/off ratio of 1.69 in top-gate field-effect-transistor(TG-FET)***,to extend the usage of ZnO TG-FET is not quite possible toward further practical ***,we clarified the correlation of inhomogeneous region in oxide/oxide hetero-junction by systematically *** work suggests that a self-assembly of molecules(SAM)buffer layer is suitable for tuning the inhomogeneous charge transport in ZnO film,which not only reduces the interface trap density,but also effectively enhances the gate electric field modulation at the *** further report the robust fabrication of TG-FET arrays based on ZnO thin film,using an ultra-thin alkylphosphonic acid molecule monolayer as buffer *** device demonstrates a pronounced ultrahigh on/off ratio of≥10^(8),which is 8-order of magnitude higher than that of a device without buffer *** the highly reliable arrays,our device exhibits a high yield of over 93%with an average on/off ratio of^10^(7) across the entire wafer scale,mobility(18.5 cm^(2)/(V·s)),an extended bias-stressing(~2,000 s)and long-stability(~150 days)under ambient conditions.

关键词： zinc oxides thin-film field-effect-transistor self-assembly molecule inhomogeneous charge transport interface engineering

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DMT:A model detecting multispecies of tea buds in multi-seasons

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International Journal of Agricultural and Biological Engineering 2024年第1期17卷 199-208页

作者： Taojie Yu Jianneng Chen Zhiwei Chen Yatao Li Junhua Tong Xiaoqiang Du School of Mechanical Engineering Zhejiang Sci-Tech UniversityHangzhou 310018China Key Laboratory of Transplanting Equipment and Technology of Zhejiang Province Hangzhou 310018China

In China,tea products made from fresh leaves characterized by one leaf with one bud(1L1B)are classified as“Famous Tea”,which has better taste and higher economic value,but suffers from a labor *** at picking automation,existing studies focus on visual detection of 1L1B,but algorithm validation is limited to a specific variety of tea sprouting in a certain harvest season at a certain location,which limits the engineering application of developed tea picking robots working in various natural tea *** address this gap,a deep learning model DMT(detecting multispecies of tea)based on YOLOX-S was proposed in this *** DMT network takes YOLOX-S as a baseline and adds ECA-Net to the CSP Darknet and FPN of *** average precision(AP),precision,and recall of DMT are 94.23%,93.39%,and 88.02%,respectively,for detecting 1L1B sprouting in spring;93.92%,93.56%,and 87.88%,respectively,for detecting 1L1Bsprouting in *** experimental results are better than those of the five current object detection *** fine-tuning the DMT network with another dataset composed of multiple tea varieties,the DMT network can detect 1L1B for different varieties of tea in multiple picking *** results can promote the engineering application of picking automation of fresh tea leaves.

关键词： tea buds detection model multispecies of tea multi-season

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Nanoscale Materials and Deformable Device Designs for Bioinspired and Biointegrated Electronics

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Accounts of Materials Research 2021年第4期2卷 266-281页

作者： Woongchan Lee Huiwon Yun Jun-Kyul Song Sung-Hyuk Sunwoo Dae-Hyeong Kim Center for Nanoparticle Research Institute for Basic Science(IBS)Seoul 08826Republic of Korea School of Chemical and Biological Engineering Institute of Chemical ProcessesSeoul National UniversitySeoul 08826Republic of Korea

Electronic devices whose structural and functional features are inspired by living creatures have unique performance and unconventional features that are not found in conventional electronic *** addition to such bioinspired electronics,with the rise of new fields such as personalized healthcare,mobile electronics,and big-data analysis,biointegrated electronic devices that can collect biomedical information from the human body through various biosensors and deliver appropriate therapeutic feedback stimulations in real time on the spot where immediate treatment is needed have become *** body parts and internal organs of living creatures,including humans,have curvilinear shapes and comprise mechanically soft tissues,such bioinspired and biointegrated electronic devices are required to match the soft and deformable features of biological *** soft and deformable features of electronic devices can be achieved by employing flexible and stretchable materials and unconventional device design *** soft materials and deformable device designs dissipate stress originating from mechanical deformation of the device and thus retard crack generation and/or propagation in the ***,technologies for nanoscale materials have shown a significant level of progress on their material performance and processing *** nanoscale dimension of the electronic materials could achieve extremely small flexural rigidity in comparison to the bulk state of the same ***,techniques to form a well-percolated network of nanomaterials in the elastomeric matrix and to build a pathway for the facile electron and hole transport inside the polymer have induced dramatic performance advances of soft electronic materials,which led to nanocomposites that can accomplish both high mechanical deformability and high electrical performance at the same *** addition,deformable device designs such as buckled structures and serpentine des

关键词： buckling rigidity electronics

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Novel efficient THz undulator using a laser-driven wire

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Light(science & Applications) 2017年第1期6卷 408-409页

作者： Kazuhisa Nakajima Center for Relativistic Laser science Institute for Basic Science(IBS)Gwangju 61005Korea

Terahertz(THz=10^(12) cycles per second,or T-ray)radiation sources are indispensable for modern materials science,chemical and biomedical imaging and sensing,as well as for a broad range of applications in diagnostic systems and advanced telecommunications1,*** electromagnetic spectrum of the THz radiation is loosely characterized by the frequency range of 0.1−10 THz,or wavelengths between 30μm and 3 *** particular,a low photon energy of 4.2 meV or 48 K at 1 THz,which is less than the thermal energy at room temperature,allows precise measurements with a simplified setup and very high signal-to-noise ratio in time-domain pulsed THz *** the spectral region is located on the boundary between electronics and photonics,the diversity of the THz sources relies on either frequency up-conversion of electronic sources,such as solid-state photo-switches and radio-frequency(RF)electron-beam accelerators3,or frequency down-conversion of optical sources,such as optical rectification2,3 in nonlinear optical processes and laser-gas interaction induced by twocolor *** technologies,however,exploit ultrashort pulse lasers as a *** a recent publication,Tian et al.4 at Shanghai institute of Optics and Fine Mechanics(SIOM)and Nankai University developed a new THz radiation source using a laser-driven wire that generates a femtosecond electron bunch and helical undulator fields to emit THz synchrotron radiation with high efficiency.

关键词： laser undulator precise

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Recent advances in soft electronic materials for intrinsically stretchable optoelectronic systems

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Opto-Electronic Advances 2022年第8期5卷 21-49页

作者： Ja Hoon Koo Huiwon Yun Woongchan Lee Sung-Hyuk Sunwoo Hyung Joon Shim Dae-Hyeong Kim Center for Nanoparticle Research Institute for Basic Science(IBS)Seoul 08826Republic of Korea School of Chemical and Biological Engineering Institute of Chemical ProcessesSeoul National UniversitySeoul 08826Republic of Korea Department of Materials science and Engineering Seoul National UniversitySeoul 08826Republic of Korea.

In recent years,significant progress has been achieved in the design and fabrication of stretchable optoelectronic *** general,stretchability has been achieved through geometrical modifications of device components,such as with serpentine interconnects or buckled ***,the local stiffness of individual pixels and the limited pixel density of the array have impeded further advancements in stretchable ***,intrinsically stretch-able optoelectronics have been proposed as an alternative ***,we review the recent advances in soft elec-tronic materials for application in intrinsically stretchable optoelectronic ***,we introduce various intrinsically stretchable electronic materials,comprised of electronic fillers,elastomers,and surfactants,and exemplify different in-trinsically stretchable conducting and semiconducting *** also describe the processing methods used to fabricate the electrodes,interconnections,charge transport layers,and optically active layers used in intrinsically stretch-able optoelectronic ***,we review representative examples of intrinsically stretchable optoelectronic devices,including light-emitting capacitors,light-emitting diodes,photodetectors,and ***,we briefly discuss intrinsically stretchable integrated optoelectronic systems.

关键词： stretchable optoelectronics light-emitting capacitors light-emitting diodes photodetectors photovoltaics intrinsically stretchable devices

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Direct competition Between mimosine and deoxythymidine triphosphate at the site of DNA replication

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Chinese science Bulletin 1999年第18期44卷 1669-1672页

作者： Li Liu Shuhui Wang Chinese Acad Med sci Inst Basic Med Sci Mol Virol Lab Beijing 100005 Peoples R China Peking Union Med Coll Beijing 100005 Peoples R China

Mimosine, a plant amino acid, is a reversible cell cycle inhibitor. Biochemical studies have indicated that mimosine may act at multiple levels near the Gl/S interface. By using mi-croinjection technique, it is shown that mimosine can also inhibit the replication of Xenopus ribo-some DNA (rDNA) plasmid reversibly. The high structure similarity between mimosine

关键词： mimosine rDNA DNA replication thymine.

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Construction of spinel/biochar film/honeycomb monolithic catalyst for photothermal catalytic oxidation of VOCs

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FRONTIERS OF CHEMICAL sciENCE AND ENGINEERING 2024年第9期18卷 102-0页

作者： Lu, Xikai Zhang, Chunyan Wu, Meng Liu, Wenjie Xue, Bin Yao, Chao Li, Xiazhang Changzhou Univ Natl Local Joint Engn Res Ctr Biomass Refining & H Changzhou 213164 Peoples R China Univ Delaware Dept Mat Sci & Engn Delaware City DE 19716 USA

Photothermal catalytic oxidation emerges as a promising method for the removal of volatile organic compounds (VOCs). Herein, via sol-gel impregnation method, spinel CuMn2O4 was coated on attapulgite honeycombs with integrating biochar (BC) film as the second carrier, using chestnut shell as complexation agent. Various mass ratios of CuMn2O4 to chestnut shell was modulated to investigate the catalytic toluene degradation performance. Results indicated that the monolithic CuMn2O4/BC/honeycomb catalyst demonstrated superior photothermal catalytic toluene degradation with a low T90 (temperature at 90% degradation) of 263 degrees C when the mass ratio of CuMn2O4 to biomass was 1:4. The addition of BC film substantially increased the honeycomb's specific surface area and improved the photothermal conversion of spinel, leading to enhanced photothermal catalytic activity. This study presents a cost-effective strategy for eliminating industrial VOCs using clay-biomass based monolithic catalyst.

关键词： CuMn2O4 biochar photothermal catalysis attapulgite honeycomb volatile organic compound PERFORMANCE ABATEMENT SURFACE

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Understanding Single-Walled Carbon Nanotube Growth for Chirality Controllable Synthesis

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Accounts of Materials Research 2021年第9期2卷 828-841页

作者： Lu Qiu Feng Ding Center for Multidimensional Carbon Materials Institute for Basic Science(IBS)Ulsan 44919South Korea School of Materials science and Engineering Ulsan National Institute of Science and Technology(UNIST)Ulsan 44919South Korea

CONSPECTUS:Chirality defines the structural and electronic properties of a single-walled carbon nanotube(SWCNT),and therefore,synthesizing SWCNT samples with single chirality is essential for future high-end applications,such as replacing silicon in next-generation *** its discovery in 1991,to realize the selective growth of SWCNTs with a unique structure has been a key focus of SWCNT *** is currently understood to be assigned at birth and might be changed during the growth *** the mechanism of chirality assignment during nucleation and chirality-dependent growth kinetics is essential for realizing the final goal of SWCNT synthesis,i.e.,the large-scale synthesis of SWCNTs with a specific chiral *** 2003,we have systematically explored chirality assignment during SWCNT nucleation,how the chirality of a SWCNT affects its growth,and how the chirality changes during *** with our experimental collaborators,we have realized the chirality-specific growth of SWCNTs via a few designed experimental *** this account,we will review all these studies and present our perspectives on this very important research *** will first introduce the screw dislocation theory of SWCNT growth to elucidate how the chirality affects the growth rate of a SWCNT and the abundance of each SWCNT in the final ***,a modified screw dislocation theory,which describes the SWCNT’s growth kinetics on a solid catalyst and its impact on chirality control during synthesis is ***,the random chiral angle assignment during SWCNT nucleation on liquid catalysts is discussed as well as why chirality control in SWCNT growth is so *** with previous experimental reports,we further demonstrate that solid catalysts have a great advantage in realizing chirality-selective SWCNT *** on our current understanding,we propose three strategies to realize chirality-selective SWCNT growth,(i)controlling th

关键词： synthesis assignment Together

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Prevention of chemical carcinogenesis using glutathine S-transferase-pi (GST-pi)

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Chinese science Bulletin 1999年第23期44卷 2168-2174页

作者： Minlei Zhang Fude Fang Chinese Acad Med sci Inst Basic Med Sci State Key Lab Med Mol Biol Beijing 100005 Peoples R China Peking Union Med Coll Beijing 100005 Peoples R China

In order to explore whether the protective function of GST-pi can prevent transformation in vitro, NIH3T3 cells and carcinogen glycidyl methacrylate (GMA) have been used in cell transformation study. NIH3T3 cells have been transfected with GST-pi cDNA inserted retrovirus vector, pXT1, and then G418 resistant clones have been analyzed by Southern and Northern analyses. NIH3T3/pXGST clones that stably express GST-pi and control cells,

关键词： glutathine S-transferase-pi ( GST-pi ) gene transduction chemical carcinogenesis glycidyl methacrylate (GMA ) gene prevention.

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Cloning of a novel gene encoding human thioredoxin-like protein

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Chinese science Bulletin 1999年第18期44卷 1673-1676页

作者： Yan Zhou Meihui Pan Jiangang Yuan Guangwei Du Boqin Qiang Chinese Acad Med sci Inst Basic Med Sci State Lab Med Mol Biol Beijing 100005 Peoples R China Peking Union Med Coll Beijing 100005 Peoples R China

mRNA differential display (DDRT-PCR) has been used to analyze different human fetal brain tissues of different developmental stages (13- and 33-week). According to the sequence of one EST obtained in this assay, a pair of primers have been designed to screen the arrayed human fetal brain cDNA library. A 1 .2-kb cDNA clone has been found. This cDNA con-

关键词： DDRT-PCR thioredoxin fetal brain.

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