The Very‐Low Shear Modulus of Multi‐Walled Carbon Nanotubes Determined Simultaneously with the Axial Young's Modulus via in situ Experiments

Wei, Xianlong; Yang, Lixue; Chen, Qing; Wang, Mingsheng; Peng, Lian‐Mao

doi:10.1002/adfm.200701105

Cited by 50 publications

(25 citation statements)

References 28 publications

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“…[ 26 ] Other researchers used different beam models to extract the elastic properties from the resonance frequency of single multiwalled CNTs that were perturbed inside an electric fi eld. [ 27,28 ] Lumped-parameter models of boron nitride nanotubes have also been used to extract nonlinear damping properties. [ 29 ] In addition, nonlinear singlebeam models were employed in the in situ study of CNT ring deformation, providing information on the CNT to substrate adhesion.…”

Section: Introductionmentioning

confidence: 99%

Effects of Nanostructure and Coating on the Mechanics of Carbon Nanotube Arrays

Poelma

Fan

et al. 2016

Adv Funct Materials

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Nanoscale materials are one of the few engineering materials that can be grown from the bottom up in a controlled manner. Here, the effects of nanostructure and nanoscale conformal coating on the mechanical behavior of vertically aligned carbon nanotube (CNT) arrays through experiments and simulation are systematically investigated. A modeling approach is developed and used to quantify the compressive strength and modulus of the CNT array under large deformation. The model accounts for the porous nanostructure, which contains multiple CNTs with random waviness, van der Waals interactions, fracture strain, contacts, and frictional forces. CNT array micropillars are grown and their porous nanostructure is controlled by the infiltration and deposition of thin conformal coatings using chemical vapor deposition. Flat‐punch nanoindentation experiments reveal significant changes in material properties as a function of coating thickness. The simulations explain the experimental results and show the novel failure transition regime that changes from collective CNT buckling toward structural collapse due to fracture. The compressive strength and the elastic modulus increase exponentially as a function of the coating thickness and demonstrate a unique dependency on the CNT waviness. More interestingly, a design rule is identified that predicts the optimum coating thickness for porous materials.

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Section: Introductionmentioning

confidence: 99%

Effects of Nanostructure and Coating on the Mechanics of Carbon Nanotube Arrays

Poelma

Fan

et al. 2016

Adv Funct Materials

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“…The scheme of investigation followed here is based on the fact that CNTs are anisotropic structures and hence these must have preferential deformation and fracture initiations with respect to the direction of loading. CNTs have high longitudinal tensile elastic modulus (about 1 TPa) and tensile strength (150-200 GPa) [29][30][31][32][33][34]. Strong covalent interactions of in-plane C-C bonds in graphene contribute to such a high stiffness and strength of CNTs.…”

mentioning

confidence: 99%

Chemical-free graphene by unzipping carbon nanotubes using cryo-milling

Tiwary

Javvaji

Kumar

et al. 2015

Carbon

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“…The resonance can be directly observed by SEM. [8,13] Examples of a SWCNT (the inset of Fig. 1b) and a MWCNT (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…For constructing MWCNT resonators, individual MWCNT, which is synthesized through arc-discharge process [25], was picked up from CNT powder using a tungsten probe (P1 in Fig. 1a) and the other end of the CNT was connected to an AFM cantilever using nanomanipulation methods reported previously [12,13], For constructing SWCNT resonators, individual SWCNT, which was grown across microtrenches on the SiO 2 /Si substrate using catalytic chemical vapor deposition method [26], was cut short and picked up by a tungsten probe (P1), then the other end of the SWCNT was connected to a Si NW cantilever. An AC voltage (1-3.5 V) [sometimes together with a DC voltage (0-2 V)] was applied to P3 through a signal generator (Agilent 33220A) to drive the CNT into vibration.…”

Section: Methodsmentioning

confidence: 99%

Beam to String Transition of Vibrating Carbon Nanotubes Under Axial Tension

Wei

Chen

et al. 2009

Adv Funct Materials

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State‐of‐the‐art nanoelectromechanical systems have been demonstrated in recent years using carbon nanotube (CNT) based devices, where the vibration of CNTs is tuned by tension induced through external electrical fields. However, the vibration properties of CNTs under axial tension have not been quantitatively determined in experiments. Here, a novel in situ method for precise and simultaneous measurement of the resonance frequency, the axial tension applied to individual CNTs and the tube geometry is demonstrated. A gradual beam‐to‐string transition from multi‐walled CNTs to single‐walled CNTs is observed with the crossover from bending rigidity dominant regime to extensional rigidity dominant regime occur much larger than that expected by previous theoretical work. Both the tube resonance frequency under tension and transition of vibration behavior from beam to string are surprisingly well fitted by the continuum beam theory. In the limit of a string, the vibration of a CNT is independent of its own stiffness, and a force sensitivity as large as 0.25 MHz (pN)−1 is demonstrated using a 2.2 nm diameter single‐walled CNT. These results will allow for the designs of CNT resonators with tailored properties.

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The Very‐Low Shear Modulus of Multi‐Walled Carbon Nanotubes Determined Simultaneously with the Axial Young's Modulus via in situ Experiments

Cited by 50 publications

References 28 publications

Effects of Nanostructure and Coating on the Mechanics of Carbon Nanotube Arrays

Effects of Nanostructure and Coating on the Mechanics of Carbon Nanotube Arrays

Chemical-free graphene by unzipping carbon nanotubes using cryo-milling

Beam to String Transition of Vibrating Carbon Nanotubes Under Axial Tension

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