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Shuit-Tong Lee

Bio: Shuit-Tong Lee is an academic researcher from Soochow University (Suzhou). The author has contributed to research in topics: Silicon & Nanowire. The author has an hindex of 138, co-authored 1121 publications receiving 77112 citations. Previous affiliations of Shuit-Tong Lee include University of British Columbia & Hong Kong University of Science and Technology.
Topics: Silicon, Nanowire, OLED, Electroluminescence, Diamond


Papers
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Journal ArticleDOI
23 Dec 2014-ACS Nano
TL;DR: Author(s): Chan, Warren CW; Gogotsi, Yury; Hafner, Jason H; Hammond, Paula T; Hersam, Mark C; Javey, Ali; Kagan, Cherie R; Kotov, Nicholas A; Lee, Shuit-Tong; Mohwald, Helmuth; Mulvaney, Paul A; Nel, Andre E; Nordlander, Peter J; Parak, Wolfgang J; Penner, Reginald M
Abstract: Author(s): Chan, Warren CW; Gogotsi, Yury; Hafner, Jason H; Hammond, Paula T; Hersam, Mark C; Javey, Ali; Kagan, Cherie R; Khademhosseini, Ali; Kotov, Nicholas A; Lee, Shuit-Tong; Mohwald, Helmuth; Mulvaney, Paul A; Nel, Andre E; Nordlander, Peter J; Parak, Wolfgang J; Penner, Reginald M; Rogach, Andrey L; Schaak, Raymond E; Stevens, Molly M; Wee, Andrew TS; Willson, C Grant; Weiss, Paul S

6 citations

Journal ArticleDOI
TL;DR: The high specificity and selectivity of H-Si nanowire bundles for detecting water and ethanol in their mixture are measured by a frequency scanning test as discussed by the authors, where the signal amplitude deduced between the work channel and the reference channel is defined as the impedance recorded under different scanning frequencies.
Abstract: The high specificity and selectivity of H–Si nanowire bundles, which are single crystalline and composed of pure Si without oxygen, for detecting water (peak at 12 Hz) and ethanol (peak at 70 Hz) in their mixture are measured by a frequency scanning test. The signal amplitude deduced between the work channel and the reference channel {[(VR-VS)/VR]×100%} is defined as the impedance recorded under different scanning frequencies.

6 citations

Journal ArticleDOI
TL;DR: In this paper, the authors reported on the utilization of zirconium tetras (8-hydroxyquinoline), Zrq4, and hafnium (IV) tetras, Hfq4 as an electroluminescent material in fluorescent organic light-emitting diodes (OLEDs) and as electron transport layer (ETL) for high-efficiency electrophosphorescent organic light emitting diode (PHOLED)s.
Abstract: — In this paper, we report on the utilization of zirconium (IV) tetras (8-hydroxyquinoline), Zrq4, and hafnium (IV) tetras (8-hydroxyquinoline), Hfq4, as an electroluminescent material in fluorescent organic light-emitting diodes (OLED) and as electron transport layer (ETL) for high-efficiency electrophosphorescent organic light-emitting diodes (PHOLEDs). Structural studies show that the metal tetraquinolates (Mq4) have a very low dipole moment (<0.1 D), in contrast to Alq3 which has an estimated dipole moment of 4.7 D. Mobility measurements show that Mq4 complexes give mobilities of (3.5 ± 0.5) × 10−6 cm2/V-sec, which are close to the values reported for Alq3, i.e., (2.3–4.3) × 10−6 cm2/V-sec. OLEDs were prepared with the structure ITO/NPD (400 A)/Mqn (500 A)/LiF/Al (NPD = 4-4′-bis[N-(1-naphthyl)-N-phenyl-amino]bi phenyl, Mqn = Alq3, Zrq4, Hfq4. The Mq4-based OLEDs gave external efficiencies of 1.1%, while the Alq3-based devices of the same structure gave efficiencies of 0.7%. PHOLEDs have been fabricated with the structure ITO/NPD (500 A)/CBP-8% Ir(ppy)3 (250 A)/BCP (150 A)/Mqn (250 A)/LiF/Al (CBP = N,N′-dicarbazolyl-4-4′-biphenyl, Ir(ppy)3 = fac-tris(2-phenylpyrridine)iridium, BCP = bathocruprione). PHOLEDs with Mq4 ETLs showed a greatly improved efficiency, when compared to Alq3-based PHOLEDs. The Zrq4-based PHOLEDs gave a peak external quantum efficiency of 14% at 0.3 mA/cm2 (150 cd/m2), while the Hfq4 based PHOLED gave a peak external quantum efficiency of 15% at 0.6 mA/cm2 (300 cd/m2). Comparable PHOLEDs with an Alq3 ETL give peak external quantum efficiencies of 8.0% at 0.5 mA/cm2. The devices gave an electroluminescence (EL) spectrum consisting only of fac-tris(2-phenylpyrridine)iridium (Ir(ppy)3) dopant emission (CIE coordinates of 0.26, 0.66), with no Mq4 emission observed at any bias level.

6 citations

Journal ArticleDOI
TL;DR: In this paper, the thermal stability after post-deposition annealing of three metallization systems, including Ni/Ti/diamond, Cr/Ti /diamond and W/Ti *, with a eutectic AuSn layer magnetron sputter-deposited on top of these metallisation schemes, was studied by Rutherford backscattering spectrometry.

6 citations

Journal ArticleDOI
TL;DR: In this article, diamond particles of ∼1 micron in size embedded in a matrix of amorphous carbon were obtained at an ion energy of 80 eV, a methane concentration of 1%, and a substrate temperature of 700°C.

6 citations


Cited by
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Journal ArticleDOI
11 Oct 2012-Nature
TL;DR: This work reviews recent progress in graphene research and in the development of production methods, and critically analyse the feasibility of various graphene applications.
Abstract: Recent years have witnessed many breakthroughs in research on graphene (the first two-dimensional atomic crystal) as well as a significant advance in the mass production of this material. This one-atom-thick fabric of carbon uniquely combines extreme mechanical strength, exceptionally high electronic and thermal conductivities, impermeability to gases, as well as many other supreme properties, all of which make it highly attractive for numerous applications. Here we review recent progress in graphene research and in the development of production methods, and critically analyse the feasibility of various graphene applications.

7,987 citations

Journal ArticleDOI
TL;DR: The theoretical charge capacity for silicon nanowire battery electrodes is achieved and maintained a discharge capacity close to 75% of this maximum, with little fading during cycling.
Abstract: There is great interest in developing rechargeable lithium batteries with higher energy capacity and longer cycle life for applications in portable electronic devices, electric vehicles and implantable medical devices. Silicon is an attractive anode material for lithium batteries because it has a low discharge potential and the highest known theoretical charge capacity (4,200 mAh g(-1); ref. 2). Although this is more than ten times higher than existing graphite anodes and much larger than various nitride and oxide materials, silicon anodes have limited applications because silicon's volume changes by 400% upon insertion and extraction of lithium which results in pulverization and capacity fading. Here, we show that silicon nanowire battery electrodes circumvent these issues as they can accommodate large strain without pulverization, provide good electronic contact and conduction, and display short lithium insertion distances. We achieved the theoretical charge capacity for silicon anodes and maintained a discharge capacity close to 75% of this maximum, with little fading during cycling.

6,104 citations

Journal ArticleDOI
09 Mar 2001-Science
TL;DR: The beltlike morphology appears to be a distinctive and common structural characteristic for the family of semiconducting oxides with cations of different valence states and materials of distinct crystallographic structures, which could be an ideal system for fully understanding dimensionally confined transport phenomena in functional oxides.
Abstract: Ultralong beltlike (or ribbonlike) nanostructures (so-called nanobelts) were successfully synthesized for semiconducting oxides of zinc, tin, indium, cadmium, and gallium by simply evaporating the desired commercial metal oxide powders at high temperatures. The as-synthesized oxide nanobelts are pure, structurally uniform, and single crystalline, and most of them are free from defects and dislocations. They have a rectanglelike cross section with typical widths of 30 to 300 nanometers, width-to-thickness ratios of 5 to 10, and lengths of up to a few millimeters. The beltlike morphology appears to be a distinctive and common structural characteristic for the family of semiconducting oxides with cations of different valence states and materials of distinct crystallographic structures. The nanobelts could be an ideal system for fully understanding dimensionally confined transport phenomena in functional oxides and building functional devices along individual nanobelts.

5,677 citations

Journal ArticleDOI
TL;DR: The state of the art, future directions and open questions in Raman spectroscopy of graphene are reviewed, and essential physical processes whose importance has only recently been recognized are described.
Abstract: Raman spectroscopy is an integral part of graphene research. It is used to determine the number and orientation of layers, the quality and types of edge, and the effects of perturbations, such as electric and magnetic fields, strain, doping, disorder and functional groups. This, in turn, provides insight into all sp(2)-bonded carbon allotropes, because graphene is their fundamental building block. Here we review the state of the art, future directions and open questions in Raman spectroscopy of graphene. We describe essential physical processes whose importance has only recently been recognized, such as the various types of resonance at play, and the role of quantum interference. We update all basic concepts and notations, and propose a terminology that is able to describe any result in literature. We finally highlight the potential of Raman spectroscopy for layered materials other than graphene.

5,673 citations

Journal ArticleDOI
TL;DR: This paper presents a meta-analysis of the chiral stationary phase transition of Na6(CO3)(SO4)2, a major component of the response of the immune system to Na2CO3.
Abstract: Ju Mei,†,‡,∥ Nelson L. C. Leung,†,‡,∥ Ryan T. K. Kwok,†,‡ Jacky W. Y. Lam,†,‡ and Ben Zhong Tang*,†,‡,§ †HKUST-Shenzhen Research Institute, Hi-Tech Park, Nanshan, Shenzhen 518057, China ‡Department of Chemistry, HKUST Jockey Club Institute for Advanced Study, Institute of Molecular Functional Materials, Division of Biomedical Engineering, State Key Laboratory of Molecular Neuroscience, Division of Life Science, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China Guangdong Innovative Research Team, SCUT-HKUST Joint Research Laboratory, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, China

5,658 citations