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Structural and Electronic Properties of Molecular Nanostructures. XVI International Winterschool on Electronic Properties of Novel Materials最新文献

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Combustion Synthesis of Nanostructures 纳米结构的燃烧合成
Structural and Electronic Properties of Molecular Nanostructures. XVI International Winterschool on Electronic Properties of Novel Materials Pub Date : 2002-10-02 DOI: 10.1063/1.1514097
A. Huczko, H. Lange, G. Chojecki, S. Cudziłlo, Y. Zhu, D. Walton, H. Kroto, A. Presz, R. Diduszko
{"title":"Combustion Synthesis of Nanostructures","authors":"A. Huczko, H. Lange, G. Chojecki, S. Cudziłlo, Y. Zhu, D. Walton, H. Kroto, A. Presz, R. Diduszko","doi":"10.1063/1.1514097","DOIUrl":"https://doi.org/10.1063/1.1514097","url":null,"abstract":"Novel carbon and inorganic 1D nanostructures were prepared by combustion of metal‐polytetrafluoroethylene (PTFE) systems in a calorimetric bomb. The high carbon yield from silicon‐containing PTFE starting materials is due to the production and volatility of SiF4.","PeriodicalId":196292,"journal":{"name":"Structural and Electronic Properties of Molecular Nanostructures. XVI International Winterschool on Electronic Properties of Novel Materials","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114245802","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Synthesis, characterization and emission properties of single-wall nanotubes produced with Ni/Cr as catalyst 以Ni/Cr为催化剂制备的单壁纳米管的合成、表征及发射性能
Structural and Electronic Properties of Molecular Nanostructures. XVI International Winterschool on Electronic Properties of Novel Materials Pub Date : 2002-10-02 DOI: 10.1063/1.1514181
V. Bezmelnitsyn, A. G. Domantovskiĭ, A. Eletskii, E. D. Obraszova, A. Pal, A. G. Pernbaum, V. V. Pichugin, K. E. Prichod’ko, N. Suetin, S. Terekhov
{"title":"Synthesis, characterization and emission properties of single-wall nanotubes produced with Ni/Cr as catalyst","authors":"V. Bezmelnitsyn, A. G. Domantovskiĭ, A. Eletskii, E. D. Obraszova, A. Pal, A. G. Pernbaum, V. V. Pichugin, K. E. Prichod’ko, N. Suetin, S. Terekhov","doi":"10.1063/1.1514181","DOIUrl":"https://doi.org/10.1063/1.1514181","url":null,"abstract":"SWNT were synthesized in high yield in the presence of a Ni/Cr alloy catalyst and studied through TEM observations, Raman spectroscopy and thermal gravimetric analysis (TGA). A “sandwich” structure of the anode is used, where a Ni/Cr alloy foil of 0.1 mm in thickness is inserted longitudinally as a catalyst between two rectangular graphite anode rods. HRTEM observations show that SWNT are bound in long bundles of tens μm in length and about 10 nm in diameter. Raman spectra show the diameter of SWNT ranging between 1.2 and 1.5 nm with maximum abundance of 1.24 nm. The initial content of SWNT in the samples is about 20%. Thermal treatment of the as‐produced sample under various temperatures and dosed air supply results in a notable mass loss of the sample and change in its content. So heating up to 600 K results in 40% loss in the mass of a sample, enhancing the SWNT yield up to 35% without any notable destruction. Heating above 600K results in practically full thermal destruction of the SWNT.","PeriodicalId":196292,"journal":{"name":"Structural and Electronic Properties of Molecular Nanostructures. XVI International Winterschool on Electronic Properties of Novel Materials","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121560993","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Hydrogen Storage in Carbon SWNTs: Atomic or Molecular? 碳单壁碳纳米管中的氢储存:原子还是分子?
Structural and Electronic Properties of Molecular Nanostructures. XVI International Winterschool on Electronic Properties of Novel Materials Pub Date : 2002-10-02 DOI: 10.1063/1.1514192
M. Haluska, M. Hirscher, M. Becher, U. Dettlaff-weglikowska, X. Chen, S. Roth
{"title":"Hydrogen Storage in Carbon SWNTs: Atomic or Molecular?","authors":"M. Haluska, M. Hirscher, M. Becher, U. Dettlaff-weglikowska, X. Chen, S. Roth","doi":"10.1063/1.1514192","DOIUrl":"https://doi.org/10.1063/1.1514192","url":null,"abstract":"The atomistic nature of hydrogen storage in carbon SWNTs has been investigated by thermal desorption spectroscopy utilizing mass spectrometry. The partial pressures of desorbed H2, D2 and HD have been simultaneously recorded after sample loading with a 1:1 mixture of H2 and D2 gases. The amount of desorbed HD molecules approaches the ratio 2:1:1 for HD:H2:D2 in the case of atomic storage. In the case of molecular storage the concentration of HD approaches the background level. It was found that hydrogen isotopes are stored as atoms in SWNT samples containing transition metals from either sample production (Ni, Fe, …) and/or activation (opening) process (Ni, Fe, Ti, …). Purified SWNTs store hydrogen in the molecular state, if any.","PeriodicalId":196292,"journal":{"name":"Structural and Electronic Properties of Molecular Nanostructures. XVI International Winterschool on Electronic Properties of Novel Materials","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121277190","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
New Approach to Growth of Photopolymerized C60 Films 光聚合C60薄膜生长的新方法
Structural and Electronic Properties of Molecular Nanostructures. XVI International Winterschool on Electronic Properties of Novel Materials Pub Date : 2002-10-02 DOI: 10.1063/1.1514064
V. Karachevtsev, O. Vovk, A. M. Plochotnichenko, A. V. Peschanskii
{"title":"New Approach to Growth of Photopolymerized C60 Films","authors":"V. Karachevtsev, O. Vovk, A. M. Plochotnichenko, A. V. Peschanskii","doi":"10.1063/1.1514064","DOIUrl":"https://doi.org/10.1063/1.1514064","url":null,"abstract":"To grow the photopolymerized C60 films the approach which consists of simultaneously deposition of films and irradiation of them by UV‐VIS was developed. The films were characterized by Raman and IR spectroscopy. Efficiency of the new approach, in comparison with the method of deposition followed with irradiation has been demonstrated.","PeriodicalId":196292,"journal":{"name":"Structural and Electronic Properties of Molecular Nanostructures. XVI International Winterschool on Electronic Properties of Novel Materials","volume":"14 11-12","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121006291","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Controlled CVD‐growth of multiwalled CNTs 多壁碳纳米管的可控CVD生长
Structural and Electronic Properties of Molecular Nanostructures. XVI International Winterschool on Electronic Properties of Novel Materials Pub Date : 2002-10-02 DOI: 10.1063/1.1514095
G. Duesberg, F. Kreupl, A. Graham, M. Liebau, E. Unger, Z. Gabric, W. Hönlein
{"title":"Controlled CVD‐growth of multiwalled CNTs","authors":"G. Duesberg, F. Kreupl, A. Graham, M. Liebau, E. Unger, Z. Gabric, W. Hönlein","doi":"10.1063/1.1514095","DOIUrl":"https://doi.org/10.1063/1.1514095","url":null,"abstract":"Many applications of carbon nanotubes (CNTs) require a material with defined properties, however most synthesis routes yield CNTs of varying purity, structure, diameter, and length. Chemical vapor deposition (CVD) allows a good control over the CNTs synthesis and leads to promising results, however the effect of many parameters remains unclear. In order to improve this situation a comprehensive study was carried out under highly controlled conditions. The used CVD reactor was capable to perform deposition processes with temperature deviations smaller than 1°K. The substrates were patterned Fe films with a thickness below 10 nm on silicon/siliconoxide. The effects of the conditioning of the catalyst prior to growth, growth temperature, and growth time were investigated. The synthesis in a hydrogen/acetylene atmosphere yielded pure multi‐walled CNTs with diameters between 10 – 20 nm. The length of the CNTs was accurately controlled by the growth time. The density of the CNTs can be varied by the preconditio...","PeriodicalId":196292,"journal":{"name":"Structural and Electronic Properties of Molecular Nanostructures. XVI International Winterschool on Electronic Properties of Novel Materials","volume":"633 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128676507","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
In situ XRD study of C60 polymerisation above pressures of 9 GPa and temperatures up to 830K 在9gpa压力和830K温度下C60聚合的原位XRD研究
Structural and Electronic Properties of Molecular Nanostructures. XVI International Winterschool on Electronic Properties of Novel Materials Pub Date : 2002-10-02 DOI: 10.1063/1.1514136
A. Talyzin, L. Dubrovinsky, M. Odén, T. Bihan, U. Jansson
{"title":"In situ XRD study of C60 polymerisation above pressures of 9 GPa and temperatures up to 830K","authors":"A. Talyzin, L. Dubrovinsky, M. Odén, T. Bihan, U. Jansson","doi":"10.1063/1.1514136","DOIUrl":"https://doi.org/10.1063/1.1514136","url":null,"abstract":"The C60 polymerization was studied by X‐ray diffraction in situ in the pressure range 13–18 GPa and at temperatures up to 830 K. The results of the high pressure high temperature treatment are strongly dependent from the history of the sample and stress. At certain conditions no elliptical diffraction patterns were observed at 13 GPa and 830K. Samples with a relatively low internal stress showed a transformation to new phase. It is suggested that this phase is three‐dimensional polymer with each C60 molecule bonded to eight neighbors. This phase showed an increased hardness (about 37 GPa) and a Raman spectrum distinctly different from previously known polymeric phases.","PeriodicalId":196292,"journal":{"name":"Structural and Electronic Properties of Molecular Nanostructures. XVI International Winterschool on Electronic Properties of Novel Materials","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128410783","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Optical properties of 4 Å‐diameter single‐wall nanotubes 4 Å直径单壁纳米管的光学性质
Structural and Electronic Properties of Molecular Nanostructures. XVI International Winterschool on Electronic Properties of Novel Materials Pub Date : 2002-10-02 DOI: 10.1063/1.1514122
M. Machoň, S. Reich, J. Maultzsch, P. Rafailov, C. Thomsen, D. Sánchez-Portal, P. Ordejón
{"title":"Optical properties of 4 Å‐diameter single‐wall nanotubes","authors":"M. Machoň, S. Reich, J. Maultzsch, P. Rafailov, C. Thomsen, D. Sánchez-Portal, P. Ordejón","doi":"10.1063/1.1514122","DOIUrl":"https://doi.org/10.1063/1.1514122","url":null,"abstract":"We studied the electronic band structure and optical absorption of carbon nanotubes with small diameters (d ≈ 4 A), which grow in the channels of a zeolite crystal. The size of the channels determines the diameter of the nanotubes and restricts their possible chiralities to three [(3,3), (5,0), and (4,2)]. We performed ab initio calculations of the electronic band structure and optical absorption of the mentioned nanotubes. We discuss our results and compare them with optical and Raman data.","PeriodicalId":196292,"journal":{"name":"Structural and Electronic Properties of Molecular Nanostructures. XVI International Winterschool on Electronic Properties of Novel Materials","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133256576","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Hydrogen Storage in Nanostructured Carbon Materials at Room Temperature 室温下纳米碳材料的储氢研究
Structural and Electronic Properties of Molecular Nanostructures. XVI International Winterschool on Electronic Properties of Novel Materials Pub Date : 2002-10-02 DOI: 10.1063/1.1514191
Xiaohong Chen, U. Dettlaff-weglikowska, M. Haluska, M. Hirscher, M. Becher, S. Roth
{"title":"Hydrogen Storage in Nanostructured Carbon Materials at Room Temperature","authors":"Xiaohong Chen, U. Dettlaff-weglikowska, M. Haluska, M. Hirscher, M. Becher, S. Roth","doi":"10.1063/1.1514191","DOIUrl":"https://doi.org/10.1063/1.1514191","url":null,"abstract":"Room temperature hydrogen sorption capacities of nanostructured carbon materials including single‐walled carbon nanotubes (SWNTs), multi‐walled carbon nanotubes (MWNTs), carbon nanohorns (CNH), activated carbon, carbon black and graphite are determined by the volumetric method. All carbon materials investigated, including the samples with high specific surface area as purified SWNTs prepared by the HiPco process and activated carbon, show a hydrogen storage capacity of less than 1 wt % at room temperature and pressures below 100 bar.","PeriodicalId":196292,"journal":{"name":"Structural and Electronic Properties of Molecular Nanostructures. XVI International Winterschool on Electronic Properties of Novel Materials","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133437939","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Effect of Structures and Morphologies of Catalyst on Growth of Carbon Nanotubes Synthesized by Chemical Vapor Deposition 催化剂结构和形貌对化学气相沉积法合成碳纳米管生长的影响
Structural and Electronic Properties of Molecular Nanostructures. XVI International Winterschool on Electronic Properties of Novel Materials Pub Date : 2002-10-02 DOI: 10.1063/1.1514105
Y. Park, I. Han, Hyungki Kim, N. Lee, Y. Jin, J. Jung, C. Y. Park, J. M. Kim
{"title":"Effect of Structures and Morphologies of Catalyst on Growth of Carbon Nanotubes Synthesized by Chemical Vapor Deposition","authors":"Y. Park, I. Han, Hyungki Kim, N. Lee, Y. Jin, J. Jung, C. Y. Park, J. M. Kim","doi":"10.1063/1.1514105","DOIUrl":"https://doi.org/10.1063/1.1514105","url":null,"abstract":"This study carried out the synthesis of carbon nanotubes (CNTs) on glass and Si substrates at lower than 550°C by thermal CVD using CO and H2 gases at an atmospheric pressure. Prior to CNT synthesis, catalyst layers of an Invar (an Fe‐Ni‐Co alloy) alloy were vacuum‐annealed at different temperatures to change the crystal structures and morphologies in order to elucidate their effect on the growth of CNTs. Vacuum annealing changed the crystal structures of catalyst from the hexagonal phase to the cubic phase and resulted in larger grain sizes at higher temperatures. The CNT growth on vacuum‐annealed catalyst layers showed the distinct morphological change of CNTs at the annealing temperature of 500°C. Such evolvement of CNT morphologies was explained by grain size change rather than the crystal structure change with annealing temperatures.","PeriodicalId":196292,"journal":{"name":"Structural and Electronic Properties of Molecular Nanostructures. XVI International Winterschool on Electronic Properties of Novel Materials","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128987611","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Nanotubes are High Mobility Semiconductors 纳米管是高迁移率半导体
Structural and Electronic Properties of Molecular Nanostructures. XVI International Winterschool on Electronic Properties of Novel Materials Pub Date : 2002-10-02 DOI: 10.1063/1.1514114
T. Dürkop, T. Brintlinger, M. Fuhrer
{"title":"Nanotubes are High Mobility Semiconductors","authors":"T. Dürkop, T. Brintlinger, M. Fuhrer","doi":"10.1063/1.1514114","DOIUrl":"https://doi.org/10.1063/1.1514114","url":null,"abstract":"The electron transport properties of a very long (20 micron) CVD‐grown nanotube are reported. In this device the transport is dominated by intrinsic scattering processes at room temperature. The room temperature hole mobility is 20,000 cm2/Vs, exceeding that of technologically‐relevant semiconductors. The mobility increases with decreasing temperature, and is estimated to be greater than 180,000 cm2/Vs at 470 mK.","PeriodicalId":196292,"journal":{"name":"Structural and Electronic Properties of Molecular Nanostructures. XVI International Winterschool on Electronic Properties of Novel Materials","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133518593","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 15
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