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| 1 | Selective Suspension in Aqueous Sodium Dodecyl Sulfate According to Electronic Structure Type Allows Simple Separation of Metallic from Semiconducting Single-Walled Carbon Nanotubes显示文摘Both density gradient centrifugation and gel electrophoresis have been reported to allow high throughput separation of metallic from semiconducting single-walled carbon nanotubes(SWNTs)when using aqueous sodium dodecyl sulphate(SDS)suspensions.We show here that both methods rely on an initial dispersion-by-sonication step,which is already selective with respect to electronic structure type.The corresponding aqueous SDS“starting”suspensions obtained after sonication and purifi cation by simple centrifugation(70,000 g,1 h)contain semiconducting SWNTs primarily in the form of small bundles whereas metallic SWNTs are predominantly suspended as individual tubes.Density gradient centrifugation then separates the bundles from the individual tubes on the basis of differences in their overall buoyant densities.Gel electrophoresis separates the longer bundles from the shorter individual tubes on the basis of their different mobilities.We also demonstrate that such starting suspensions can be fractionated according to electronic structure type by even simpler techniques such as size exclusion chromatography or gel fi ltration,thus opening the way for simple scale-up. | Kai Moshammer Frank Hennrich Manfred M.Kappes | 2009 | Nano Research2009，2，8： | 7 |
| 2 | Imaging Electronic Structure of Carbon Nanotubes by Voltage-Contrast Scanning Electron Microscopy显示文摘We introduce voltage-contrast scanning electron microscopy(VC-SEM)for visual characterization of the electronic properties of single-walled carbon nanotubes.VC-SEM involves tuning the electronic band structure and imaging the potential profi le along the length of the nanotube.The resultant secondary electron contrast allows to distinguish between metallic and semiconducting carbon nanotubes and to follow the switching of semiconducting nanotube devices,as confi rmed by in situ electrical transport measurements.We demonstrate that high-density arrays of individual nanotube devices can be rapidly and simultaneously characterized.A leakage current model in combination with fi nite element simulations of the device electrostatics is presented in order to explain the observed contrast evolution of the nanotube and surface electrodes.This work serves to fi ll a void in electronic characterization of molecular device architectures. | Aravind Vijayaraghavan Sabine Blatt Christoph Marquardt Simone Dehm Raghav Wahi Frank Hennrich Ralph Krupke | 2008 | Nano Research2008，1，4： | 2 |
| 3 | Effect of chemical modifications on peptide fragmentation behavior upon electron transfer induced dissociation显示文摘 | HENNRICH M L BOERSEMA P J VAN DEN TOORN H | 2009 | Anal Chem2009，81，18： | 1 |
| 4 | Synthesis and in vitro evaluation of 68Ga-DOTA-4-FBn-TN14003, a novel tracer for the imaging of CXCR4 expression显示文摘 | Hennrich U Seyler L Sch-fer M | 2012 | Bioorg Med Chem2012，20，4： | 1 |
| 5 | Confocal fluorescence imaging of DNA-functionalized carbon nanotubes显示文摘 | Hazani M Naaman R Hennrich F | 2003 | Nano Lett2003，，3： | 1 |
| 6 | Redox switchable fluorescent probe selective for either Hg(11)or Cd( I1 ) and Zn( II ) 显示文摘 | Hennrich G Sonnenschein H Resch-Genger U | 1999 | J Am Chem Soc1999，121，： | 1 |
| 7 | A simple pyrene “click”-type modification of DNA affects solubilisation and photoluminescence of single-walled carbon nanotubes显示文摘 | Schmucker W Klumpp S Hennrich F | 2013 | RSC Adv2013，3，18： | 1 |
| 8 | Separation of metallic from semiconducting single-walled carbon nanotubes 显示文摘 | Krupke R Hennrich F Lohneysen H V | 2003 | Science2003，301，： | 1 |
| 9 | Preparation of monodisperse silicon nanocrystals using density gradient ultracentrifugation显示文摘 | MASTRONARDI M HENNRICH F HENDERSON E | 2011 | J Am Chem Soc2011，133，11： | 1 |
| 10 | Failure mechanism of free standing single-walled carbon nanotube thin films under tensile load显示文摘 | Malik S Rosner H Hennrich F | 2004 | Phys Chem Chem Phys2004，6，13： | 1 |
| 11 | Proteinase K from Tritirachium album Limber显示文摘 | Ebeling W Hennrich Nand Klockow M | 1974 | Biochem1974，47，： | 1 |
| 12 | Contacting single bundles of carbon nanotubes with alternating electric fields显示文摘 | R. Krupke F. Hennrich H.B. Weber D. Beckmann O. Hampe S. Malik M.M. Kappes H. v. L?hneysen | 2003 | Applied Physics A Materials Science & Processing2003，，3： | 1 |
| 13 | Recent advances in peptide separation by multidimensional liquid chromatography for proteome analysis 显示文摘 | Di Palma S Hennrich ML Heck AJ et ol | 2012 | J Proteomics2012，75，13： | 1 |
| 14 | Proteinase Kfrom Tritirachium album Limber显示文摘 | Ebeling W Hennrich N Klockow M | 1974 | European Journal ofBiochemistry1974，47，1： | 1 |
| 15 | Principles of carbon nanotube dielectrophoresis显示文摘Dielectrophoresis(DEP)describes the motion of suspended objects when exposed to an inhomogeneous electric field.It has been successful as a method for parallel and site-selective assembling of nanotubes from a dispersion into a sophisticated device architecture.Researchers have conducted extensive works to understand the DEP of nanotubes in aqueous ionic surfactant solutions.However,only recently,DEP was applied to polymer-wrapped single-walled carbon nanotubes(SWCNTs)in organic solvents due to the availability of ultra-pure SWCNT content.In this paper,the focus is on the difference between the DEP in aqueous and organic solutions.It starts with an introduction into the DEP of carbon nanotubes(CNT-DEP)to provide a comprehensive,in-depth theoretical background before discussing in detail the experimental procedures and conditions.For academic interests,this work focuses on the CNT-DEP deposition scheme,discusses the importance of the electrical double layer,and employs finite element simulations to optimize CNT-DEP deposition condition with respect to the experimental observation.An important outcome is an understanding of why DEP in organic solvents allows for the deposition and alignment of SWCNTs in low-frequency and even static electric fields,and why the response of semiconducting SWCNTs(s-SWCNTs)is strongly enhanced in non-conducting,weakly polarizable media.Strategies to further improve CNT-DEP for s-SWCNT-relevant applications are given as well.Overall,this work should serve as a practical guideline to select the appropriate setting for effective CNT DEPs. | Wenshan Li Frank Hennrich Benjamin S.Flavel Simone Dehm Manfred Kappes Ralph Krupke | 2021 | Nano Research2021，14，7： | 1 |
| 16 | Separa- tion of metallic from semiconducting single-walled car- bonnanotubes显示文摘 | Krupke R Hennrich F Lohneysen H | 2003 | Science2003，301，5631： | 1 |
| 17 | Isolation and characterization of C80显示文摘 | Hennrich F H Michel R H Fischer A | 1996 | Angew Chem Int Ed1996，35，： | 1 |
| 18 | 查看详情显示文摘 | J T Barreiro M Müler P Sehindler D Nigg T Monz M Chwalla M Hennrich C F Roos P Zoller and R Blatt | | 0，，7335： | 1 |
| 19 | Confocal fluorescence imaging of DNA-functionalized carbon nanotubes 显示文摘 | Hazani M Naaman R Hennrich F | 2003 | Nano Lett2003，3，2： | 1 |
| 20 | Confocal fluorescence imaging of DNA-functionalized carbon nsnotubes显示文摘 | HAZANI M NAMAN R HENNRICH F | 2003 | Nano Letters2003，3，： | 1 |
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