Self-Built Tensile Strain in Large Single-Walled Carbon Nanotubes

Gao, Pingqi; Zheng, Lianxi; Yuan, Shaoning; You, Yu‐Meng; Shen, Zexiang; He, Deyan

doi:10.1021/nn9011219

Cited by 5 publications

(4 citation statements)

References 27 publications

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“…S2). The third possibility of the frequency downshift is due to the “self-built” tensile strain, existing in the SWNTs decorated with graphite dots39. However, there was no graphite dot decorated on our SWNT, as observed in the magnified AFM and SEM images; this verifies that the so-called “self-built” tensile strain does not exist in our SWNT sample.…”

Section: Resultssupporting

confidence: 55%

Direct Preparation of Carbon Nanotube Intramolecular Junctions on Structured Substrates

Zhan

Sun

et al. 2016

Sci Rep

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Leveraging the unique properties of single-walled carbon nanotube (SWNT) intramolecular junctions (IMJs) in innovative nanodevices and next-generation nanoelectronics requires controllable, repeatable, and large-scale preparation, together with rapid identification and comprehensive characterization of such structures. Here we demonstrate SWNT IMJs through directly growing ultralong SWNTs on trenched substrates. It is found that the trench configurations introduce axial strain in partially suspended nanotubes, and promote bending deformation in the vicinity of the trench edges. As a result, the lattice and electronic structure of the nanotubes can be locally modified, to form IMJs in the deformation regions. The trench patterns also enable pre-defining the formation locations of SWNT IMJs, facilitating the rapid identification. Elaborate Raman characterization has verified the formation of SWNT IMJs and identified their types. Rectifying behavior has been observed by electrical measurements on the as-prepared semiconducting-semiconducting (S-S) junction.

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Section: Resultssupporting

confidence: 55%

Direct Preparation of Carbon Nanotube Intramolecular Junctions on Structured Substrates

Zhan

Sun

et al. 2016

Sci Rep

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“…36 Raman spectroscopy is a common method for detecting changes in the material's properties due to interaction with its environment. [45][46][47][48] The overall broadening of the conjugated double-bond SERS peak is likely due to a diverse set of molecular orientations, which is possible with essentially four different groups or more (conjugated double bond, three carboxyl groups, and possibly nitrogen) vying to bind to the metal surface. Early work on SERS examined molecules similar to domoic acid to study how multiple binding sites such as carboxyl groups, nitrogen, and p-electron systems affect the SERS generation of the molecule.…”

Section: Discussionmentioning

confidence: 99%

Raman and Surface-Enhanced Raman Detection of Domoic Acid and Saxitoxin

et al. 2011

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The use of surface-enhanced Raman scattering (SERS) for detecting domoic acid and saxitoxin was demonstrated and vibrational modes have been assigned based on the current literature. Silver nanoparticles were used to obtain the SERS spectra of domoic acid for the first time, which displayed enhancement of nearly 70 times the normal Raman spectra. Unique features in the SERS spectrum of domoic acid allowed the binding effect and orientation of the domoic acid to the metal surface to be analyzed. Saxitoxin exhibited an undetectable normal Raman signal but revealed very prominent SERS peaks. SERS peak positions closely matched published experimental and theoretical values, but with different peak ratios, indicating variance in molecule–nanoparticle interaction depending on the SERS substrate utilized. SERS is demonstrated as a powerful analytical tool for detecting toxins at low concentration with molecular specificity and shows immense potential for fast and remote sensing of toxins in various applications.

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“…The D * -vibration is special in that it shows a relatively large change in the Raman shift in response to strain (or stress). 51,52 For a CNT/polymer composite, the behavior of the D * -vibration of CNTs can thus be used to study interaction between CNTs and a polymer matrix. 53,54 As shown in Fig.…”

Section: Interfacial Interaction Between Mwcnt and Pb: Raman Spectros...mentioning

confidence: 99%

Microstructural and property changes in high pressure treated carbon nanotube/polybutadiene composites

Tonpheng

Gröbner

et al. 2011

J. Mater. Chem.

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In a comprehensive investigation of carbon nanotube (CNT) filled liquid and solid polybutadienes of molecular weights 2600 and 100 000, respectively, we report results of thermal conductivity (k), glass transition temperature (T g ), interfacial interaction and microstructure before and after simultaneous highpressure and high-temperature (HP&HT) treatment. The HP&HT treatment changed polybutadiene from a liquid or solid to a highly cross-linked, ebonite-like, state. Concurrently, the microstructure changed from randomly dispersed CNTs to a web-like structure of coated and/or wrapped CNTs, with a permanent shift in their D*-band by as much as $16 cm À1 . Moreover, k of the recovered state of a 2.9 wt% -COOH functionalized multi-wall carbon nanotube (MWCNT) composite increased by $34% predominantly due to an irreversible densification and a consequentially increased phonon velocity. Results prior to treatment show that single-wall carbon nanotube (SWCNT) fillers promote k better (17%/wt%) than -SH functionalized MWCNT fillers (8%/wt%), which is accounted for by their higher aspect ratio, whereas their about twice as high k appears to be unimportant. The SWCNTs also raise T g slightly more than MWCNTs and, in particular, under the most densified conditions and for the high molecular weight polybutadiene, which may be due to more favorable conditions for coating/wrapping.

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Self-Built Tensile Strain in Large Single-Walled Carbon Nanotubes

Cited by 5 publications

References 27 publications

Direct Preparation of Carbon Nanotube Intramolecular Junctions on Structured Substrates

Direct Preparation of Carbon Nanotube Intramolecular Junctions on Structured Substrates

Raman and Surface-Enhanced Raman Detection of Domoic Acid and Saxitoxin

Microstructural and property changes in high pressure treated carbon nanotube/polybutadiene composites

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