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Effects of surface charging treatment on outer and inner surfaces of a nanoporous carbon

JOURNAL OF MATERIALS RESEARcH 2009年第8期24卷 2471-2475页

作者： Lu, Weiyi Han, Aijie Kim, Taewan Lim, Hyuck Qiao, Yu Univ Calif San Diego Dept Struct Engn La Jolla CA 92093 USA Univ Calif San Diego Program Mat Sci & Engn La Jolla CA 92093 USA Univ Texas Pan Amer Dept Chem Edinburg TX 78539 USA

As the outer surface of a nanoporous carbon is treated with 16-mercaptohexadecanoic acid, the carbon particles can form a stable suspension in water. When the water phase is compressed, the liquid infiltration behavior in the nanopores becomes significantly different from that of untreated material, suggesting that the inner surface is also modified. After the treatment, the infiltration pressure does not decrease. Therefore, the chain configurations at the inner and outer surfaces must be different, which explains the variations in infiltration pressure and volume.

关键词： c Infiltration (assembly) Surface reaction

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High-spin organic molecular materials

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cURRENT OPINION IN SOLID STATE & MATERIALS ScIENcE 1997年第4期2卷 446-450页

作者： Matsuda, K Iwamura, H Institute for Fundamental Research of Organic Chemistry Kyushu University Hakozaki Higashi-ku Fukuoka 812-81 Japan

High-spin organic molecular materials are recent subjects of active studies. In diradicals and radical pairs, the ground states are usually singlet due to the overlap of the orbitals containing the unpaired electrons. When the singly occupied orbitals are orthogonal to each other, triplet states become ground states. Thanks to the promotion of our understanding of how to stabilize the triple relative to the singlet, a number of examples of purely organic assemblies of free radicals and oligo/polyradicals have been accumulated, in which more than two electron spins are aligned in parallel. Approaches toward high T-c and tunable organic molecule-based magnets are in steady progress.

关键词： AH alternant hydrocarbon J exchange coupling parameter: + and − signs correspond to ferro- and antiferromagnetic interactions, respectively. T c critical temperature TME tetramethyleneethane TMM trimethylenemethane

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On the thermally conductive behaviour of compacted graphite nanosheets

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MIcRO & NANO LETTERS 2010年第4期5卷 219-221页

作者： Kuo, Wen-Shyong Ko, Tse-Hao Lu, Hsin-Fang Feng Chia Univ Dept Aerosp & Syst Engn Taichung 407 Taiwan Feng Chia Univ Dept Mat Sci & Engn Taichung 407 Taiwan Feng Chia Univ PhD Program Mech & Aeronaut Engn Taichung 407 Taiwan

Thermally conductive properties of compacts composed of graphite nanosheets (GNSs) are studied. The GNSs were made by the intercalation and exfoliation of natural graphite (NG) flakes. The GNSs were then compressed to make graphite compacts. Thermal diffusivities along the in-plane and transverse directions are measured using a laser flash method. The anisotropic ratio of the thermal conductivities ranges between 20 and 25. The properties of graphite compacts based on NG flakes are also studied. The results reveal that the GNS-based compact can be consolidated at a lower density, whereas the NG-based counterpart is denser and has a higher thermal conductivity. To protect the graphite compact, a method for coating a copper layer on the graphite compact was developed. The results also indicate the copper coating enhances heat transfer into the graphite compact.

关键词： laser materials processing Powder techniques, compaction and sintering copper thermal diffusion thermal conductivity thermally conductive properties c graphite heat transfer natural graphite flake exfoliation thermal diffusivities compaction natural graphite flake intercalation copper layer coating graphite compacts anisotropic ratio Nonelectronic thermal conduction and heat-pulse propagation in nonmetallic solids laser flash method Preparation of fullerenes and fullerene-related materials, intercalation compounds, and diamond Methods of nanofabrication and processing Laser materials processing nanostructured materials compacted graphite nanosheets density

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Flows in one-dimensional and two-dimensional carbon nanochannels: Fast and curious

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MRS BULLETIN 2017年第4期42卷 278-282页

作者： Majumder, Mainak Siria, Alessandro Bocquet, Lyderic Monash Univ Mech Engn Clayton Vic Australia Monash Univ Chem Engn Clayton Vic Australia Ecole Normale Super Lab Phys Stat Paris France Ecole Normale Super Phys Paris France

carbon materials exist in a large number of allotropic forms and exhibit a wide range of physical and chemical properties. From the perspective of fluidics, particularly within the confines of the nanoscale afforded by one-dimensional carbon nanotubes (cNTs) and two-dimensional graphene structures, many unique properties have been discovered. However, other questions, such as the link between electronic states and hydrodynamics and accurate model predictions of transport, remain unanswered. Theoretical studies, experiments in large-scale ensembles of cNTs and stacked graphene sheets, and precise measurements at the single-pore and single-molecule level have helped in our understanding. These activities have led to explosive growth in the field, now known as carbon nanofluidics. The ability to produce membranes and devices from fluid phases of graphene oxide, which retain these special properties in molecular-scale flow channels, promises realization of applications in the near term.

关键词： fluidics nanoscale c

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Diamond FET: high-speed optical switch

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ELEcTRONIcS LETTERS 2010年第24期46卷 1614-1615页

作者： conte, G. Ricciotti, G. calvani, P. Giovine, E. Univ Roma Tre Dept Elect Engn I-00146 Rome 84 Italy CNR IFN Inst Photon & Nanotechnol I-00156 Rome Italy

A high-speed optical switch based on an ultraviolet sensitive surface channel MESFET fabricated on polycrystalline diamond has been developed. Saturation response to a nanosecond pulsed excimer laser has been demonstrated. Such an opaque gate three-terminal device is suitable for power applications where electromagnetic interference on power control interfaces is not negligible.

关键词： optical saturation Optical transient phenomena, self-induced transparency, optical saturation and related effects Ultrafast optical techniques optical fabrication nanosecond pulsed excimer laser high-speed optical switch integrated optoelectronics Integrated optoelectronics Electro-optical devices high-speed optical techniques electro-optical switches diamond Other field effect devices Schottky gate field effect transistors c electromagnetic interference opaque gate three-terminal device diamond FET Optical saturation and related effects ultraviolet sensitive surface channel MESFET Optical fabrication, surface grinding

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Spiral shape cNT on silicon substrate growth control method for on-chip electronic devices applications

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ELEcTRONIcS LETTERS 2012年第11期48卷 639-641页

作者： Abu Qahouq, J. A. carnahan, D. L. Univ Alabama Dept Elect & Comp Engn Tuscaloosa AL 35487 USA NanoLab Inc Waltham MA 02451 USA

carbon nanotubes (cNTs) with their different types have several potential future applications, including on-chip integrated electronic devices. The growth control of cNTs in the desired shape is important to realise such devices. A method to control the growth of cNTs in a desired spiral shape or other similar shapes on silicon (Si) substrates is proposed. Multi-walled carbon nanotube growth in a circular spiral shape is demonstrated by using a trenched-patterned-shape on the Si substrate method. The growth concept, the growth and fabrication steps, and the growth and fabrication results are presented.

关键词： elemental semiconductors silicon semiconductor growth multiwalled carbon nanotube growth silicon substrates fabrication steps carbon nanotubes spiral shape cNT Nanometre-scale semiconductor fabrication technology c nanofabrication silicon substrate growth control method on-chip integrated electronic devices trenched-patterned-shape Elemental semiconductors Fullerene, nanotube and related devices Si

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Synthesis and characterisation of VG nanosheets on silica aerogel by plasma-enhanced chemical vapour deposition method

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MIcRO & NANO LETTERS 2019年第6期14卷 595-599页

作者： Vigneswari, S. Murugesan, S. Sathyabama Inst Sci & Technol Dept Phys Chennai 600119 Tamil Nadu India

Vertical graphene (VG) nanosheets are directly grown on silica aerogel and silicon substrate (100) by plasma-enhanced chemical vapour deposition process in the presence of hydrogen as a reducing agent at atmospheric pressure at 800 degrees c. The physiochemical properties of the nanohybrid were thoroughly characterised by Raman spectroscopy, scanning electron microscopy (SEM) and atomic force microscopy (AFM). The presence of full wave half maximum of D, G and D ' indicates VG nanowalls. The height (50 nm) of the VG nanowalls were confirmed by SEM and Raman spectroscopy but AFM reveals it as 15 nm. Surface and cross-sectional SEM show the uniform distribution of vertical growth of nanowalls and the AFM revealed surface morphology of VG nanowalls.

关键词： Raman spectra nanostructured materials atomic force microscopy X-ray diffraction plasma cVD scanning electron microscopy surface morphology nanofabrication graphene AFM cross-sectional SEM silica aerogel plasma-enhanced chemical vapour deposition method silicon substrate physiochemical properties Raman spectroscopy atomic force microscopy vertical graphene nanosheets full wave half maximum temperature 800 0 degc pressure 1 atm SiO2 c

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Research on carbon nanotube array field emission pressure sensors

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ELEcTRONIcS LETTERS 2005年第14期41卷 824-825页

作者： Qian, K chen, T Yan, B Lin, Y Xu, D Sun, Z cai, B Shanghai Jiao Tong Univ Res Inst Micronano Sci & Technol Minist Educ Key Lab Thin Film & Microfabricat Technol Shanghai 200030 Peoples R China E China Normal Univ Nanotech Ctr Shanghai 200062 Peoples R China

A novel field emission pressure sensor has been achieved using carbon nanotube (cNT) arrays as the field emitters. The sensor consists of the anode elastic membrane fabricated by wet etching process and a multi-wall carbon nanotube array cathode in the micro-vacuum cavity. The Prototype pressure sensor has a measured sensitivity of about 0.16-0.78 nA/Pa(101-550 kPa). The work suggests the potential use of cNT-based field emitters in microsensors such as accelerometers and tactile sensors.

关键词： accelerometers etching carbon nanotubes Electron emission, materials and cathodes microvacuum cavity field emission anode elastic membrane field emission pressure sensors tactile sensors microsensors wet etching process sensitivity c carbon nanotube arrays pressure sensors Microsensors and nanosensors field emitter arrays Vacuum microelectronics Fullerene, nanotube and related devices

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Nanographene device fabrication using atomic force microscope

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MIcRO & NANO LETTERS 2013年第8期8卷 422-425页

作者： Ahmad, Muneer Seo, Yongho choi, Young Jin Sejong Univ Graphene Res Inst Seoul 143747 South Korea Sejong Univ Fac Nanotechnol & Adv Mat Engn Seoul 143747 South Korea MyongJi Univ Dept Phys Yongin 449728 South Korea MyongJi Univ Dept Nano Sci & Engn Yongin 449728 South Korea

A report is presented on the local anodic oxidation of graphene film prepared by chemical vapour deposition using contact mode atomic force microscopy. Raman spectroscopy was used to check the uniformity and thickness of large area graphene film. Various kinds of patterns such as lines, ribbons and further, more complex structures, such as hexagons, two-terminal bar-like devices, were written by varying the tip voltage from -6 to -12 V and the tip speed from 60 to 200 nm/s. It was found that one can easily write any kind of patterns by just manipulating the tip voltage and tip speed instead of concentrating on other factors such as controlled humidity conditions, applied force on the tip and tip current. Also, it is confirmed that with an increase in tip voltage and by slowing the tip movement during lithography, one can write very narrow and sharp patterns which are important factors for the fabrication of graphene-based electronic devices.

关键词： anodisation atomic force microscopy chemical vapour deposition nanofabrication nanolithography Raman spectra graphene c lithography controlled humidity condition tip speed tip voltage two terminal bar like device graphene film film thickness film uniformity Raman spectroscopy chemical vapour deposition local anodic oxidation contact mode atomic force microscopy nanographene device fabrication

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Aptamer and graphene-based electrochemical biosensor for dopamine determination with high sensitivity and selectivity

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MIcRO & NANO LETTERS 2013年第12期8卷 903-905页

作者： Jiao, Luyang Lu, Guangjian Zhang, chunxiao Yuan, Yan Wang, Junxiang Zhang, Qunmei Li, Pingfa XinXiang Med Univ Dept Lab Med Xinxiang 453003 Peoples R China XinXiang Med Univ Affiliated Hosp 1 Xinxiang 453003 Peoples R China

Dopamine is a kind of neurotransmitter. The abnormalities in dopamine metabolism may lead to various psychiatric and neurodegenerative diseases. Thus, fast and accurate detection of dopamine is urgently needed. Presented in this Letter is a convenient and cost-effective electrochemical method for the detection of dopamine based on aptamer and graphene. The specific recognition between dopamine and the RNA aptamer allows high selectivity, and the excellent electronic properties of graphene nanosheets ensure the high sensitivity of this biosensor.

关键词： biosensors diseases electrochemical sensors molecular biophysics molecular configurations nanostructured materials neurophysiology RNA sensitivity sheet materials graphene nanosensors c graphene nanosheets electronic properties RNA aptamer specihc recognition cost-effective electrochemical method convenient electrochemical method dopamine detection neurodegenerative diseases psychiatric diseases dopamine metabolism neurotransmitter sensitivity dopamine determination graphene-based electrochemical biosensor aptamer-based electrochemical biosensor

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