Electromechanical vibration of carbon nanocoils

Deng, Chenghao; Pan, Lujun; Ma, He; Cui, Ruixue

doi:10.1016/j.carbon.2014.10.019

Cited by 28 publications

(15 citation statements)

References 41 publications

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“…As-grown carbon nanocoils (CNCs), the coiled CNTs, are generally a mixture of amorphous, polycrystalline, and helical structure of sp 2 grains and sp 3 amorphous hybridized carbon atoms. − The physical properties of CNCs may be different from both sp 3 structured amorphous carbon nanofibers and sp 2 structured CNTs. , Due to the peculiar helical morphologies, incomplete crystalline structures and nanometer sizes, CNCs display great potential in various applications, including near-infrared sensors, flexible strain sensors, wave absorbers, field emitters, and microelectromechanical systems (MEMS). − Although many research studies have been carried out to understand the electrical, thermal, and mechanical properties of CNCs, the humidity sensing characteristic of CNCs has never been explored until now. In this work, we pioneered the fabrication of a CNC-based, highly sensitive, and ultrafast humidity sensor on a flexible liquid crystal polymer (LCP) substrate.…”

Section: Introductionmentioning

confidence: 99%

Carbon Nanocoil-Based Fast-Response and Flexible Humidity Sensor for Multifunctional Applications

Sun

et al. 2019

ACS Appl. Mater. Interfaces

230

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Carbon nanocoils (CNCs) are employed to fabricate fast, high-resolution, and reversible humidity sensor based on a flexible liquid crystal polymer (LCP) substrate. The humidity sensor displays fast-response (1.9 s) and recovery time (1.5 s), a broad relative humidity (RH) detection range (4−95%), linearity, repeatability, and stability. The rapid response and recovery are considered to benefit from the hydrophobic effect of the LCP substrate and high purity of the CNCs, which give rise to weak physical adsorption. Meanwhile, the high sensitivity results from both the unique helical structure of CNCs and the microporous structure of the LCP substrate. The distinctive structure-related properties enable the sensor to reliably perceive an extremely small RH variation of 0.8%, which is too small to be detected by most humidity sensors reported previously. These features allow the sensor to monitor a variety of important human activities, such as respiration, speaking, blowing, and noncontact fingertip sensation, accurately. Furthermore, different human physical conditions can be distinguished by recognizing the respiration response patterns. In addition, the long-term operation and mechanical bending do not adversely affect the sensing performance.

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Section: Introductionmentioning

confidence: 99%

Carbon Nanocoil-Based Fast-Response and Flexible Humidity Sensor for Multifunctional Applications

Sun

et al. 2019

ACS Appl. Mater. Interfaces

230

132

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“…For instance, a nanomachine made from Pd nanospring is reported to show efficient propulsion in the presence of either magnetic or acoustic fields [8,9]. Up to date, researchers have successfully synthesized nanosprings based on different types of materials, such as Pt nanowire [10], multi-walled carbon nanotube (MWCNT) [11,12], silicon monoxide (SiO) [13], boron carbide nanowire [14], silica [15], and carbon nanocoils [16]. Meanwhile, plenty of work have been conducted to assess the electrical [17], magnetic [18], and mechanical properties of nanospring [11,19].…”

Section: Introductionmentioning

confidence: 99%

Graphene helicoid as novel nanospring

Zhan

Zhang

Yang

et al. 2017

Carbon

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Advancement of nanotechnology has greatly accelerated the miniaturization of mechanical or electronic devices/components. This work proposes a new nanoscale spring -a graphene nanoribbon-based helicoid (GH) structure by using large-scale molecular dynamics simulation. It is found that the GH structure not only possesses an extraordinary high tensile deformation capability, but also exhibits unique features not accessible from traditional springs. Specifically, its yield strain increases when its inner radius is enlarged, which can exceed 1000%, and it has three elastic deformation stages including the initial delamination, stable delamination and elastic deformation. Moreover, the failure of the GH is found to be governed by the failure of graphene nanoribbon and the inner edge atoms absorb most of the tensile strain energy. Such fact leads to a constant elastic limit force (corresponding to the yield point) for all GHs. This study has provided a comprehensive understanding of the tensile behaviors of GH, which opens the avenue to design novel nanoscale springs based on 2D nanomaterials.

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“…A possible hypothesis is that the flex point of curving CNC acts as a non-fixed lever fulcrum; the flex point reduces the effective length of CNC cantilever. Previous work has demonstrated that the resonance frequency is proportional to the squared length of CNC, and CNC show larger amplitude under low-frequency actuation [5,6]. Thus, free-end-actuated CNC cantilever shows a lower effective resonance frequency and a higher-amplitude vibration.…”

Section: Figurementioning

confidence: 94%

“…Obviously, longer CNC shows larger vibration amplitude. However, longer CNC suffers from greater air damping (generally, the damping factor becomes more than 1 when the length of CNC reaches 90 µm [5,15]), which would reduce the amplitude. Accordingly, the vibration characteristics of CNC cantilever is dominated by the balance between the length and damping force.…”

Section: The Dynamic Photo-induced Vibration Characteristics Of Cncsmentioning

confidence: 99%

“…The excellent flexible and stretchable properties of CNCs benefit their applications in the fields of strain sensors [1,2] and biological probes [3]. Because of the large aspect ratio, CNCs have been used as cantilevers for mass sensing [4] and mechanical resonators [5][6][7]. However, the small size of CNCs reduces the operation efficiency while increasing the possibility of mechanical invasiveness.…”

Section: Introductionmentioning

confidence: 99%

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The photo‐mechanical response characteristics of carbon nanocoil‐based cantilever

Wang

Deng

et al. 2020

Micro & Nano Letters

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Carbon nanocoils (CNCs), with quasi‐1D morphology and unique helical structure, are found to have great potential as nanocantilevers for multifunctional micro/nano electro‐mechanical devices and systems. Instead of conventional mechanical actuation, photo‐actuation is a high‐efficient and low‐power‐consuming approach with the advantages of remote control and possible utilization of solar energy. This work investigates the photo‐mechanics of CNC‐based cantilever. An “enhancement of photo‐mechanical response” effect is found, which comes from the photothermal coupling between CNC and surrounding environment. Moreover, for curving CNCs, the photo‐induced vibration of CNC cantilever is strongly modulated through regulating the laser‐irradiation position. The amplitude‐to‐length ratio increases nearly five‐fold, from 0.05 to 0.24. CNC‐based nanocantilevers have promising applications in photo‐controlled thermal generators and photo‐driven actuators.

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Electromechanical vibration of carbon nanocoils

Cited by 28 publications

References 41 publications

Carbon Nanocoil-Based Fast-Response and Flexible Humidity Sensor for Multifunctional Applications

Carbon Nanocoil-Based Fast-Response and Flexible Humidity Sensor for Multifunctional Applications

Graphene helicoid as novel nanospring

The photo‐mechanical response characteristics of carbon nanocoil‐based cantilever

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