Density Gradient Ultracentrifugation on Carbon Nanotubes According to Structural Integrity as a Foundation for an Absolute Purity Evaluation

Backes, Claudia; Bosch, Sebastian; Mundloch, Udo; Hauke, Frank; Hirsch, Andreas

doi:10.1002/cphc.201100258

Cited by 13 publications

(13 citation statements)

References 35 publications

(33 reference statements)

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“…Figure 2f simulates the interaction between the TNTHCDR3 peptide and the SWCNTs, in agreement with the mechanism reported in a previous study [23]. Meanwhile, the comparison of the FT-NIR absorbance spectra in Figure 2g between the pristine SWCNTs and the TNTHCDR3 peptide-functionalized SWCNTs in DMF solvent clearly shows that good dispersion occurred without aggregation [24]. To prove that the SWCNTs were successfully immobilized on the APTES-based SPR gold surface shown in Figure 2b, CV was performed for comparison with and without a SWCNT-modified gold surface.…”

Section: Resultssupporting

confidence: 89%

An SPR Sensor Chip Based on Peptide-Modified Single-Walled Carbon Nanotubes with Enhanced Sensitivity and Selectivity in the Detection of 2,4,6-Trinitrotoluene Explosives

Wang

Onodera

et al. 2018

Sensors

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In this study, we developed a surface plasmon resonance (SPR) sensor chip based on 2,4,6-trinitrotoluene (TNT) recognition peptide-modified single-walled carbon nanotubes (SWCNTs). The carboxylic acid-functionalized SWCNTs were immobilized on a 3-aminopropyltriethoxysilane (APTES)-modified SPR Au chip surface. Through π-stacking between the aromatic amino acids and SWCNTs, the TNT recognition peptide TNTHCDR3 was immobilized onto the surface of the SWCNTs. The peptide–SWCNTs-modified sensor surface was confirmed and evaluated by atomic force microscope (AFM) observation. The peptide–SWCNTs hybrid SPR sensor chip exhibited enhanced sensitivity with a limit of detection (LOD) of 772 ppb and highly selective detection compared with commercialized carboxymethylated dextran matrix sensor chips.

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Section: Resultssupporting

confidence: 89%

An SPR Sensor Chip Based on Peptide-Modified Single-Walled Carbon Nanotubes with Enhanced Sensitivity and Selectivity in the Detection of 2,4,6-Trinitrotoluene Explosives

Wang

Onodera

et al. 2018

Sensors

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“…The individual, freestanding nanotubes [samples (iii)] were grown by catalyzed chemical vapor deposition [31]. The used catalyst particles had been adsorbed on 3 µm thick thermally oxidized polycrystalline Si support, patterned as sharp opposing tips [32] nanotubes [33,34]. The spectra were collected from nanotubes in solution drop-casted on Si/SiO 2 or directly from aqueous solution.…”

Section: Experimental Details and Sample Preparationmentioning

confidence: 99%

Diameter dependence of the defect-induced Raman modes in functionalized carbon nanotubes

Laudenbach

Schmid

Herziger

et al. 2017

Carbon

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Covalent functionalization of single-walled carbon nanotubes typically leads to an intensity increase of the defect-induced Raman mode (D mode). A large intensity ratio of the D and G modes (D/G ratio) is therefore often used as evidence for a successful functionalization. Here, we discuss the effect of the D-mode resonance on the D/G ratio and compare pristine and covalently functionalized nanotubes. By resonance Raman spectroscopy we study the evolution of the lineshape and frequencies of the D and 2D modes of samples enriched with semiconducting and metallic nanotubes in comparison with the radial breathing mode. First, we experimentally demonstrate

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“…In addition, the absorption peaks of the SWNTs are significantly sharper and more intense than those of the SWNTs dispersed with a common surfactant, such as sodium dodecyl sulfate, , which indicates the dispersion of individual SWNTs. The resonant ratio of the SWNT absorption peaks (resonant area) to the nonresonant background represents the sample purity and structural integrity of the SWNTs . The resonant ratio of raw SWNTs is typically in the range of 0.03, whereas that of ASP-wrapped SWNTs is 0.09.…”

Section: Resultsmentioning

confidence: 99%

“…The resonant ratio of the SWNT absorption peaks (resonant area) to the nonresonant background represents the sample purity and structural integrity of the SWNTs. 38 The resonant ratio of raw SWNTs is typically in the range of 0.03, 38 whereas that of ASP-wrapped SWNTs is 0.09. Compared to defect-free SWNTs, which exhibit a resonant ratio of 0.15, the resonant ratio of ASP-wrapped SWNTs of 0.09 is significantly high.…”

Section: Resultsmentioning

confidence: 99%

Composite Interlayer Consisting of Alcohol-Soluble Polyfluorene and Carbon Nanotubes for Efficient Polymer Solar Cells

Lee

Eom

et al. 2020

ACS Appl. Mater. Interfaces

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We report the synthesis of composite interlayers using alcohol-soluble polyfluorene (ASP)-wrapped single-walled carbon nanotubes (SWNTs) and their application as electron-transport layers for efficient organic solar cells. The ASP enables the individual dispersion of SWNTs in solution. The ASP-wrapped SWNT solutions are stable for 54 days without any aggregation or precipitation, indicating their very high dispersion stability. Using the ASP-wrapped SWNTs as a cathode interlayer on zinc oxide nanoparticles (ZnO NPs), a power conversion efficiency of 9.45% is obtained in PTB7-th:PC71BM-based organic solar cells, which is mainly attributed to the improvement in the short circuit current. Performance enhancements of 18 and 17% are achieved compared to those of pure ZnO NPs and ASP on ZnO NPs, respectively. In addition, the composite interlayer is applied to non-fullerene-based photovoltaics with PM6:Y6, resulting in a power conversion efficiency of up to 14.37%. The type of SWNT (e.g., in terms of diameter range and length) is not critical to the improvement in the charge-transport properties. A low density of SWNTs in the film (∼1 SWNTs/μm2 for ASP-wrapped SWNTs) has a significant influence on the charge transport in solar cells. The improvement in the performance of the solar cell is attributed to the increased internal quantum efficiency, balanced mobility between electrons and holes, and minimized charge recombination.

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Density Gradient Ultracentrifugation on Carbon Nanotubes According to Structural Integrity as a Foundation for an Absolute Purity Evaluation

Cited by 13 publications

References 35 publications

An SPR Sensor Chip Based on Peptide-Modified Single-Walled Carbon Nanotubes with Enhanced Sensitivity and Selectivity in the Detection of 2,4,6-Trinitrotoluene Explosives

An SPR Sensor Chip Based on Peptide-Modified Single-Walled Carbon Nanotubes with Enhanced Sensitivity and Selectivity in the Detection of 2,4,6-Trinitrotoluene Explosives

Diameter dependence of the defect-induced Raman modes in functionalized carbon nanotubes

Composite Interlayer Consisting of Alcohol-Soluble Polyfluorene and Carbon Nanotubes for Efficient Polymer Solar Cells

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