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Growth of Serpentine Carbon Nanotubes on Quartz Substrates and Their Electrical Properties

Nano Research 2008年第5期1卷 427-433页

作者： Seokwoo Jeon Changgu Lee Jinyao Tang james hone Colin Nuckolls Department of Chemistry Columbia UniversityNew YorkNY 10027USA Department of Mechanical Engineering Columbia UniversityNew YorkNY 10027USA The Columbia University Nanoscale Science and Engineering Center Columbia UniversityNew YorkNY 10027USA

A simple method for high-yield,chemical vapor deposition(CVD)synthesis of serpentine carbon nanotubes,employing quartz substrates and a molecular cluster catalyst,is *** growth mechanism is analyzed by controlled addition of nanoscale barriers,and by mechanical analysis of the curved *** serpentine structures are used to study the electrical transport properties of parallel arrays of identical nanotubes,which show three-terminal conductance that scales linearly with the number of nanotube segments.

关键词： Aligned carbon nanotube chemical vapor deposition growth quartz substrate electronics

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Electron-hole hybridization in bilayer graphene

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National Science Review 2020年第2期7卷 248-253页

作者： Siqi Wang Mervin Zhao Changjian Zhang Sui Yang Yuan Wang Kenji Watanabe Takashi Taniguchi james hone Xiang Zhang NSF Nanoscale Science and Engineering Center (NSEC) University of California Materials Sciences Division Lawrence Berkeley National Laboratory Department of Mechanical Engineering Columbia University National Institute for Materials Science Faculties of Sciences and Engineering University of Hong Kong

Band structure determines the motion of electrons in a solid, giving rise to exotic phenomena when properly engineered. Drawing an analogy between electrons and photons, artificially designed optical lattices indicate the possibility of a similar band modulation effect in graphene systems. Yet due to the fermionic nature of electrons, modulated electronic systems promise far richer categories of behaviors than those found in optical lattices. Here, we uncovered a strong modulation of electronic states in bilayer graphene subject to periodic potentials. We observed for the first time the hybridization of electron and hole sub-bands, resulting in local band gaps at both primary and secondary charge neutrality points. Such hybridization leads to the formation of flat bands, enabling the study of correlated effects in graphene systems. This work may provide a novel way to manipulate electronic states in layered systems, which is important to both fundamental research and application.

关键词： band modulation periodic potential bilayer graphene

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Electrically focus-tuneable ultrathin lens for high-resolution square subpixels

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Light(Science & Applications) 2020年第1期9卷 1066-1078页

作者： Sehong Park Gilho Lee Byeongho Park Youngho Seo Chae bin Park Young Tea Chun Chulmin Joo Junsuk Rho Jong Min Kim james hone Seong Chan Jun School of Mechanical Engineering Yonsei University50 Yonsei-roSeodaemun-guSeoul 03722Republic of Korea Electrical Engineering Division Engineering DepartmentUniversity of Cambridge9 JJ Thomson AvenueCambridge CB3 OFAUK Department of Electronic Material Engineering Korea Maritime and Ocean UniversityBusan 49112Republic of Korea Department of Mechanical Engineering Pohang University of Science and Technology(POSTECH)77 Cheongam-roNam-guPohang 37673Republic of Korea Department of Chemical Engineering Pohang University of Science and Technology(POSTECH)77 Cheongam-roNam-guPohang 37673Republic of Korea Institute for Convergence Research and Education in Advanced Technology Yonsei University50 Yonsei-roSeodaemun-guSeoul 03722Republic of Korea Department of Mechanical Engineering Columbia University500 West 120th StreetMudd 220New YorkNY 10027USA

Owing to the tremendous demands for high-resolution pixel-scale thin lenses in displays,we developed a graphenebased ultrathin square subpixel lens(USSL)capable of electrically tuneable focusing(ETF)with a performance competitive with that of a typical mechanical refractive *** fringe field due to a voltage bias in the graphene proves that our ETF-USSL can focus light onto a single point regardless of the wavelength of the visible light—by controlling the carriers at the Dirac point using radially patterned graphene layers,the focal length of the planar structure can be adjusted without changing the curvature or position of the lens.A high focusing efficiency of over 60% at a visible wavelength of 405 nm was achieved with a lens thickness of <13 nm,and a change of 19.42% in the focal length with a 9% increase in transmission was exhibited under a driving *** design is first presented as an ETF-USSL that can be controlled in pixel units of flat panel displays for visible *** can be easily applied as an add-on to high resolution,slim displays and provides a new direction for the application of multifunctional autostereoscopic displays.

关键词： visible driving competitive

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Optical conductivity-based ultrasensitive mid-infrared biosensing on a hybrid metasurface

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Light(Science & Applications) 2018年第1期7卷 405-415页

作者： Yibo Zhu Zhaoyi Li Zhuang Hao Christopher DiMarco Panita Maturavongsadit Yufeng Hao Ming Lu Aaron Stein Qian Wang james hone Nanfang Yu Qiao Lin Department of Mechanical Engineering Columbia UniversityNew YorkNY 10027USA Department of Applied Physics and Applied Math Columbia UniversityNew YorkNY 10027USA Department of Chemistry and Biochemistry University of South CarolinaColumbiaSC 29208USA National Laboratory of Solid State Microstructures College of Engineering and Applied Sciencesand Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China Center for Functional Nanomaterials Brookhaven National LaboratoryUptonNY 11973USA

Optical devices are highly attractive for biosensing as they can not only enable quantitative measurements of analytes but also provide information on molecular ***,typical refractive index-based optical sensors do not have sufficient sensitivity to probe the binding of low-molecular-weight ***-optical devices such as field-effect transistors can be more sensitive but do not offer some of the significant features of optical devices,particularly molecular *** present optical conductivity-based mid-infrared(mid-IR)biosensors that allow for sensitive and quantitative measurements of low-molecular-weight analytes as well as the enhancement of spectral *** sensors employ a hybrid metasurface consisting of monolayer graphene and metallic nano-antennas and combine individual advantages of plasmonic,electronic and spectroscopic ***,the hybrid metasurface sensors can optically detect target molecule-induced carrier doping to graphene,allowing highly sensitive detection of low-molecular-weight analytes despite their small ***,the resonance shifts caused by changes in graphene optical conductivity is a well-defined function of graphene carrier density,thereby allowing for quantification of the binding of ***,the sensor performance is highly stable and consistent thanks to its insensitivity to graphene carrier mobility ***,the sensors can also act as substrates for surfaceenhanced infrared *** demonstrated the measurement of monolayers of sub-nanometer-sized molecules or particles and affinity binding-based quantitative detection of glucose down to 200 pM(36 pg/mL).We also demonstrated enhanced fingerprinting of minute quantities of glucose and polymer molecules.

关键词： conductivity surface Optical

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Profiles and removal efficiency of polycyclic aromatic hydrocarbons by two different types of sewage treatment plants in Hong Kong

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Journal of Environmental Sciences 2017年第3期29卷 196-206页

作者： Yu Bon Man Ka Lai Chow Zhang Cheng Wing Yin Mo Yung Hau Chan james Chung Wah Lam Frankie Tat Kwong Lau Wing Cheong Fung Ming Hung Wong Consortium on Health EnvironmentEducation and Research(CHEER)and Department of Science and Environmental StudiesThe Education University of Hong KongTai PoHong KongChina Department of Environmental Engineering Jinan UniversityGuangzhou 510630China State Key Laboratory in Marine Pollution Croucher Institute for Environmental SciencesHong Kong Baptist University and City University of Hong KongKowloon TongHong KongChina Department of Geography Hong Kong Baptist UniversityKowloon TongHong KongChina College of Environment Sichuan Agricultural UniversityChengdu 611130China State Key Laboratory in Marine Pollution and Research Centre for the Oceans and Human Health City University of Hong KongKowioon TongHong KongChina The Drainage Services Department The Government of the Hong Kong Special Administrative RegionHong KongChina

Sewage discharge could be a major source of polycyclic aromatic hydrocarbons （PAHs） in the coastal waters. Stonecutters Island and Shatin Sewage Treatment Works （SCISTW and STSTW） in Hong Kong, adopted chemically enhanced primary treatment and biological treatment, respectively. This study aimed at （1） determining the removal efficiencies of PAHs, （2） comparing the capabilities in removing PAHs, and （3） characterizing the profile of each individual PAHs, in the two sewage treatment plants （STPs）. Quantification of 16 PAHs was conducted by a Gas Chromatography. The concentrations of total PAHs decreased gradually along the treatment processes （from 301 ± 255 and 307 ± 217 ns/L to 14.9 ± 12.1 and 63.3 ± 54.1 ng/L in STSTW and SCISTW, respectively）. It was noted that STSTW was more capable in removing total PAHs than SCISTW with average total removal effidency 94.4% ± 4.12% us. 79.2% ± 7.48% （p 〈 0.05）. The removal of PAHs was probably due to sorption in particular matter, confirmed by the higher distribution coefficient of individual and total PAHs in solid samples （dewatered sludge contained 92.5% and 74.7% of total PAHs in SCISTW and STSTW, respectively） than liquid samples （final efffluent-total contained 7.53% and 25.3% of total PAHs in STSTW and SCISTW, respectively）. Despite the impressive capability of STSTW and SCISTW in removing PAHs, there was still a considerable amount of total PAHs （1.85 and 39.3 ks/year, respectively for the two STPs） being discharged into hone Kon coastal waters, which would be an environmental concern.

关键词： Sewage treatment plantsPAHsRemoval efficiencySludgeSewage

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