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Carbon nanotubes have been studied both as exceptionally strong materials and as elements in ultra-sensitive force sensors, but those are different measurements. A 2019 study measured ultimate tensile strengths of 25–66 GPa in 16 individual, structure-defined single-walled nanotubes. A separate cryogenic resonator experiment reported a force sensitivity of 12 zN Hz−1/2 at 1.2 K. The first number describes resistance to breaking under tension; the second describes detection of tiny forces.
What does “ultimate force measurement” mean here?
It can refer to either a nanotube’s ultimate tensile strength—the stress at which it fails under tension—or to a sensor made with a nanotube that detects small forces. These quantities use different units and answer different questions. Tensile strength is reported in gigapascals (GPa); force-sensor sensitivity is commonly stated as force per square root of bandwidth, such as zN Hz−1/2.
How strong are individual carbon nanotubes?
There is no single universal strength value in these studies. The measured result varies with the tested nanotube’s structure and condition.
Structure-defined tubes: 25–66 GPa
A 2019 Nature Communications study reports direct ultimate tensile-strength measurements on 16 individual, structure-defined single-walled carbon nanotubes. Their measured strengths ranged from 25 to 66 GPa and depended on tube structure. Within that measured set, small-diameter tubes near the armchair structure had the highest strengths. Nature Communications (2019)
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Defect-free and defective tubes: about 100 GPa versus 40–70 GPa
A separate 2010 Advanced Materials study reports approximately 100 GPa for individual single-walled nanotubes without visible defects, a value the authors described as approaching the theoretical limit for defect-free tubes. The same study reports 40–70 GPa for tubes with spatially separated, stepwise pentagon–heptagon defects. These figures apply to that study’s specimens and should not be merged with the 2019 range as though all nanotubes share one typical strength. Advanced Materials (2010)
The 2010 work tested individual tubes using a high-resolution transmission electron microscope equipped with a conducting atomic-force-microscopy unit, relating measured strength to visible structure and defects. The contrast between its reported defect-free and defective tubes illustrates why structural characterization matters when comparing tensile-strength results.
Can a carbon nanotube measure force?
Yes. Researchers have used nanotubes in force-sensing devices, but the result depends on the device architecture and operating conditions. Such measurements are not tensile-strength tests: they quantify how a sensor responds to an applied force or to an interaction.
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Nanotube resonator: 12 zN Hz−1/2 at 1.2 K
A 2013 Nature Nanotechnology study reported a force sensitivity of 12 zN Hz−1/2 using a resonator made from a carbon nanotube at 1.2 K. The researchers detected low-amplitude vibrations with cross-correlated electrical-noise measurements and parametric downconversion, then calibrated the sensitivity by applying a known capacitive force. The cryogenic temperature is part of the result: it is not a general sensitivity figure for nanotube devices under ordinary room-temperature conditions. Nature Nanotechnology (2013)
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Suspended nanotube transistor and optical tweezers
A 2018 Nano Letters study paired a suspended carbon-nanotube transistor with dual-trap optical tweezers to measure interactions between individual molecules near equilibrium. It reports an equilibrium force of 1.2 ± 0.5 pN, which the authors considered likely related to binding between the nanotube and a single DNA base. This is a force measured in a particular molecular-interaction setup, not a tensile-strength value or the resonator’s sensitivity. Nano Letters (2018)
How to compare the reported numbers
| Study or setup | What was measured | Reported result | Key qualification |
|---|---|---|---|
| Structure-defined individual nanotubes, 2019 | Ultimate tensile strength | 25–66 GPa | 16 individual single-walled tubes; strength depended on structure. |
| Individual nanotubes with and without visible defects, 2010 | Ultimate tensile strength | About 100 GPa without visible defects; 40–70 GPa with specified stepwise defects | Study- and specimen-specific reported values. |
| Nanotube resonator, 2013 | Force sensitivity | 12 zN Hz−1/2 | Measured at 1.2 K; calibrated using an applied capacitive force. |
| Suspended nanotube transistor with dual-trap optical tweezers, 2018 | Equilibrium force in molecular interactions | 1.2 ± 0.5 pN | Authors said it was likely related to nanotube–DNA-base binding. |
These values cannot be ranked on one scale. Strength measurements concern failure under tension, whereas sensor sensitivity describes the smallest detectable force relative to measurement bandwidth, and the molecular study reports a force in a specific interaction experiment. A meaningful comparison also needs the specimen or device architecture, structural characterization, temperature, calibration method, and—where reported—the number of samples.
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Other nanotube force-measurement approaches
Nanotubes also appear in characterization setups beyond the resonator and molecular sensor. One approach measures force–distance behavior with a metal-coated, tipless AFM cantilever while monitoring electrical current to derive mechanical and electrical properties of vertically aligned nanotubes. Another uses an individual-nanotube micro-cantilever force sensor calibrated inside a scanning electron microscope. These are distinct experimental methods, not evidence of a single standard consumer instrument or interchangeable performance specification. AFM force–distance characterization · Individual-nanotube micro-cantilever sensor
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The studies establish that individual nanotubes can withstand very high tensile stresses in particular tested conditions, and that nanotube-based resonators or transistor architectures can be used for sensitive force measurements. They do not establish one strength value for every carbon nanotube, a room-temperature equivalent of the 2013 cryogenic sensitivity, or a consumer product recommendation. These are specialized research experiments; the reported results should be read with their sample, device, and operating conditions attached.
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