Superstrong Ultralong Carbon Nanotubes for Mechanical Energy Storage

Wei, Fei; Wen, Quan; Qian, Weizhong; Su, Dang Sheng; Zhang, Qiang; Wei, Fei

doi:10.1002/adma.201100344

Cited by 184 publications

(96 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is of note that the local strain is suffi ciently small to maintain the electrical property of the SWCNT channel upon mechanical deformation of pre-strain and roll-up. [ 48,49 ] In a similar manner, the local strain applied to the Pd electrodes was also estimated to be ∼0.22% which is also small enough to keep the stable electrical performances under the pre-strain and releasing deformation. [ 50 ] By a serial connection of three SWCNT CMOS inverters, a ring oscillator can be fabricated and a stable device performance is expected only with the reproducible performance of the individual inverter.…”

Section: Resultsmentioning

confidence: 99%

Fabrication of Stretchable Single‐Walled Carbon Nanotube Logic Devices

Yoon

Shin

Kim

et al. 2014

Small

View full text Add to dashboard Cite

The fabrication of a stretchable single-walled carbon nanotube (SWCNT) complementary metal oxide semiconductor (CMOS) inverter array and ring oscillators is reported. The SWCNT CMOS inverter exhibits static voltage transfer characteristics with a maximum gain of 8.9 at a supply voltage of 5 V. The fabricated devices show stable electrical performance under the maximum strain of 30% via forming wavy configurations. In addition, the 3-stage ring oscillator demonstrates a stable oscillator frequency of ∼3.5 kHz at a supply voltage of 10 V and the oscillating waveforms are maintained without any distortion under cycles of pre-strain and release. The strains applied to the device upon deformation are also analyzed by using the classical lamination theory, estimating the local strain of less than 0.6% in the SWCNT channel and Pd electrode regions which is small enough to keep the device performance stable under the pre-strain up to 30%. This work demonstrates the potential application of stretchable SWCNT logic circuit devices in future wearable electronics.

show abstract

Section: Resultsmentioning

confidence: 99%

Fabrication of Stretchable Single‐Walled Carbon Nanotube Logic Devices

Yoon

Shin

Kim

et al. 2014

Small

View full text Add to dashboard Cite

show abstract

“…In this way, the resonant frequency of the high-frequency mode, which is linear and has good stability but has low amplitude, could be followed by detecting the nonlinear low frequency mode, which has a much larger amplitude, increasing the signal-to-noise ratio. Finally, further applications of the internal resonance phenomenon in MEMS and NEMS can be imagined, such as in mechanical energy storage with resonators 27 , where energy input at low frequencies could be stored in higher frequency modes, thus using the multiple degrees of freedom of the resonator to extend its energy storage capacity.…”

Section: E T Lmentioning

confidence: 99%

Frequency stabilization in nonlinear micromechanical oscillators

2012

View full text Add to dashboard Cite

mechanical oscillators are present in almost every electronic device. They mainly consist of a resonating element providing an oscillating output with a specific frequency. Their ability to maintain a determined frequency in a specified period of time is the most important parameter limiting their implementation. Historically, quartz crystals have almost exclusively been used as the resonating element, but micromechanical resonators are increasingly being considered to replace them. These resonators are easier to miniaturize and allow for monolithic integration with electronics. However, as their dimensions shrink to the microscale, most mechanical resonators exhibit nonlinearities that considerably degrade the frequency stability of the oscillator. Here we demonstrate that, by coupling two different vibrational modes through an internal resonance, it is possible to stabilize the oscillation frequency of nonlinear self-sustaining micromechanical resonators. our findings provide a new strategy for engineering low-frequency noise oscillators capitalizing on the intrinsic nonlinear phenomena of micromechanical resonators.

show abstract

“…Carbon nanotubes (CNTs) are undoubtedly one of the most attractive materials in the past two decades because of their superior properties and potential applications in many fields. Particularly, ultralong CNTs, with their perfect onedimensional nanostructures and excellent properties, such as extraordinary mechanical strength, ultrahigh electron mobility and excellent electrical conductivity [1][2][3] , are promising building blocks for high-performance fibres and nanodevices. However, the direct visualization, location and manipulation of individual CNTs, especially single or few-walled CNTs, is extremely difficult because of their nanosized diameters.…”

mentioning

confidence: 99%

“…S1. Suspended ultralong CNTs were grown by chemical vapour deposition 1,17,18 on a silicon substrate containing many trenches (0.5-1 mm in width and 0.5 mm in depth). The as-grown CNTs were brought into contact with TiCl 4 vapour for in-situ deposition of TiO 2 NPs (see Methods section for details).…”

mentioning

confidence: 99%