P614
886-2-2789-6722
jasonc [at] phys.sinica.edu.tw
P614
886-2-2789-6722
jasonc [at] phys.sinica.edu.tw
Hung, Min-Ling / 886-2-2789-6750
(1) | 2017 | AVS Fellow | ||
(2) | 其他國際學術研究獎項 | 2012-12 | APS Fellow | |
(3) | 國內學術研究獎項 | 2010-01 | 中華民國物理學會會士 |
(1) | 西元年:2012 研究人員(中):張嘉升 研究人員(英):CHANG, JASON CHIA-SENG 研究成果名稱(中):奈米尺度下的毛細現象 研究成果名稱(英):Critical Capillary Absorption of Current-melting Silver Nanodroplets into Multiwall Carbon Nanotubes 簡要記述(中):利用電子顯微鏡原位研究奈米尺度下的毛細現象。以修試過的不同孔徑之奈米碳管為毛細管,以熱融化之銀奈米顆粒為液滴,我們發現液滴和管徑的比例需小於一定比值,液滴才能進入碳管,而且該比值會隨碳管孔徑縮小也變小。 簡要記述(英):Capillarity, involving the absorption of a liquid by a tube, is a commonplace phenomenon in the macroscopic world. The phenomenon can be characterized by the contact angle formed between the meniscus and the tube. In this study, we would like to test if this macroscopic theory of capillarity could also be applied to the nanometer scale. We thus conducted real-time experiments on the capillary actions of liquid Ag nanodroplets into carbon nanotubes (CNTs). Our observation reveals that the capillary absorption of molten Ag droplets can occur only when the ratio of the Ag droplet’s size to the inner diameter of a multiwall carbon nanotube goes below a critical value, and this value decreases as the CNT’s inner diameter reduces. This finding is important for understanding the capillarity at the nanoscale and for applying it to the fabrication of CNT composites.
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(2) | 西元年:2010 研究人員(中):張嘉升 研究人員(英):CHANG, JASON CHIA-SENG 研究成果名稱(中):利用單顆銀奈米粒子在奈米碳管不同位置所產生的震盪變化 研究成果名稱(英):Resonance frequency shift of a carbon nanotube with a silver nanoparticle adsorbed at various positions 簡要記述(中):我們成功地將單顆銀奈米粒子至於奈米碳管震盪器之上,測量其共振頻率隨銀粒子在碳管上位置的變化,發現變化曲線符合古典連續模型的預測,意即古典連續模型適用於奈米的範圍,驗證古典物理極限可下探至奈米尺度,此最新研究成果已發表於APPLIED PHYSICS LETTERS 97, 133105 (2010)。 簡要記述(英):We have successfully positioned a single silver nanoparticle along the length of a carbon nanotube based resonator, and investigated the resonance frequency shift subject to the particle’s position. They found that a curve derived from the classical continuum model can fit well to their experimental data, implying the applicability of the analytical formula even in the nanometer range. They also used the finite element simulation to elicit the subtle frequency difference caused by the radial angle of nanoparticle’s position in reference to the vibrating plane of the resonator. This effect was found to have an insignificant correction to their measurement. This newest discovery, “Resonance frequency shift of a carbon nanotube with a silver nanoparticle adsorbed at various positions”, has been published in APPLIED PHYSICS LETTERS 97, 133105 (2010).
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(3) | 西元年:2008 研究人員(中):張嘉升 研究人員(英):CHANG, JASON CHIA-SENG 研究成果名稱(中):In Situ Tailoring and Manipulation of Carbon 研究成果名稱(英):In Situ Tailoring and Manipulation of Carbon 簡要記述(中):We have familiarized ourselves with manipulating and tailoring a carbon nanotube through years. Unless the dimension and structure of a multi-walled carbon nanotube (MWCNT) can be fully controlled, its full potential cannot be realized. To achieve this goal, synergy of several techniques is usually required. We thus developed a set of methods in our UHV TEM-STM system, involving the attachment of a CNT to a metallic electrode, trimming of a CNT to a desired length, a fine control of both the inner and outer diameters of a MWCNT with single-layer precision, in situ fabrication of nanoclusters on CNT with predetermined sizes, transferring a cluster between two CNTs, etc. In result, these methods create a new dimension for nanotube technology and, when combining with an existing detecting technique such as electromechanically induced tube vibrating, we have fabricated a balance with the resolution of a Ag atom mass using a tailor-made CNT. 簡要記述(英):We have familiarized ourselves with manipulating and tailoring a carbon nanotube through years. Unless the dimension and structure of a multi-walled carbon nanotube (MWCNT) can be fully controlled, its full potential cannot be realized. To achieve this goal, synergy of several techniques is usually required. We thus developed a set of methods in our UHV TEM-STM system, involving the attachment of a CNT to a metallic electrode, trimming of a CNT to a desired length, a fine control of both the inner and outer diameters of a MWCNT with single-layer precision, in situ fabrication of nanoclusters on CNT with predetermined sizes, transferring a cluster between two CNTs, etc. In result, these methods create a new dimension for nanotube technology and, when combining with an existing detecting technique such as electromechanically induced tube vibrating, we have fabricated a balance with the resolution of a Ag atom mass using a tailor-made CNT. |
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(4) | 西元年:2008 研究人員(中):張嘉升 研究人員(英):CHANG, JASON CHIA-SENG 研究成果名稱(中):Two-dimensional dopant profiling by electrostatic force microscopy using carbon nanotube modified cantilevers 研究成果名稱(英):Two-dimensional dopant profiling by electrostatic force microscopy using carbon nanotube modified cantilevers 簡要記述(中):Another important issue concerning the current semiconductor manufacturing industry is the control of dopant concentration and distribution under the gate of a modern MOSFET device. At the nanoscale, variation of effective channel length (Leff) could lead to local bridging of the device, resulting in extremely low threshold voltage and in turn deteriorating its performance. The first challenge set forth for us is to be able to detect these buried dopants. We apply a high-quality CNT-modified cantilever into the electrostatic force microscopy (EFM) measurement and achieve a 10 nm resolution under the ambient conditions, which should interest the industry with significant impact. 簡要記述(英):Another important issue concerning the current semiconductor manufacturing industry is the control of dopant concentration and distribution under the gate of a modern MOSFET device. At the nanoscale, variation of effective channel length (Leff) could lead to local bridging of the device, resulting in extremely low threshold voltage and in turn deteriorating its performance. The first challenge set forth for us is to be able to detect these buried dopants. We apply a high-quality CNT-modified cantilever into the electrostatic force microscopy (EFM) measurement and achieve a 10 nm resolution under the ambient conditions, which should interest the industry with significant impact. |
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(5) | 西元年:2008 研究人員(中):張嘉升 研究人員(英):CHANG, JASON CHIA-SENG 研究成果名稱(中):Study of mean absorptive potential using Lenz model: Toward quantification of phase contrast from an electrostatic phase plate 研究成果名稱(英):Study of mean absorptive potential using Lenz model: Toward quantification of phase contrast from an electrostatic phase plate 簡要記述(中):The development of the phase-plate and wet-cell for TEM in biological imaging has been funded by both the NSC and Academia Sinica. This collaborative endeavor involves specialists from our Institute and National Tsing-Hua University. So far, we have succeeded in demonstration of all our conceptual designs and main efforts are devoted in improving the robustness and durability of our devices. Several papers are in writing and filing of patents is also in preparation. 簡要記述(英):The development of the phase-plate and wet-cell for TEM in biological imaging has been funded by both the NSC and Academia Sinica. This collaborative endeavor involves specialists from our Institute and National Tsing-Hua University. So far, we have succeeded in demonstration of all our conceptual designs and main efforts are devoted in improving the robustness and durability of our devices. Several papers are in writing and filing of patents is also in preparation. |
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(6) | 西元年:2006 研究人員(中):張嘉升 研究人員(英):CHANG, JASON CHIA-SENG 研究成果名稱(中):Magic Numbers of Atoms in Surface-Supported Planar Clusters 研究成果名稱(英):Magic Numbers of Atoms in Surface-Supported Planar Clusters 簡要記述(中):The strength of our labs lies at the capability of resolving and controlling the structure close to the atomic scale. Using the scanning tunneling microscopy (STM), existence of magic numbers in surface-supported two-dimensional Ag clusters has been discovered experimentally for the first time. Detailed calculations based on first-principles density functional theory were performed to illuminate the origin of these magic numbers. They inherently originate from the electronic shell closing effect when the cluster is small. As the Ag cluster grows to a certain size, the geometrical effect takes hold from the electronic effect as the major attribute. By combining the magical nature of size-dependent Ag cluster with the suitable Pb island substrate, planar clusters in restricted magic numbers and shapes has been fabricated in an ordered array. 簡要記述(英):The strength of our labs lies at the capability of resolving and controlling the structure close to the atomic scale. Using the scanning tunneling microscopy (STM), existence of magic numbers in surface-supported two-dimensional Ag clusters has been discovered experimentally for the first time. Detailed calculations based on first-principles density functional theory were performed to illuminate the origin of these magic numbers. They inherently originate from the electronic shell closing effect when the cluster is small. As the Ag cluster grows to a certain size, the geometrical effect takes hold from the electronic effect as the major attribute. By combining the magical nature of size-dependent Ag cluster with the suitable Pb island substrate, planar clusters in restricted magic numbers and shapes has been fabricated in an ordered array. |