Combination of Axial Strain Tuning and Gate Bias Tuning for Carbon Nano Tube Resonators
-
- Englisch ausgewählt
65,80 €
inkl. gesetzl. MwSt.,
Beschreibung
Produktdetails
Einband
Taschenbuch
Erscheinungsdatum
20.11.2025
Herausgeber
Christofer HieroldVerlag
Hartung-GorreSeitenzahl
216
Maße (L/B/H)
24/17/1,4 cm
Gewicht
400 g
Auflage
2025
Sprache
Englisch
ISBN
978-3-86628-855-3
high-frequency and large-range eigenfrequency tuning, yet practical
demonstrations have long been limited by the difficulty of precisely
applying axial strain. This thesis overcomes that challenge by introducing
a custom micro-electro-mechanical system (MEMS) with chevron-style
thermal actuators capable of displacing the CNT’s clamping ends and
generating pure tensile strain levels up to 1.4%. By combining this axial
strain with gate-bias-induced strain, frequency tuning of 67MHz was
achieved, equivalent to over 150% relative tuning, reaching
eigenfrequencies over 120MHz across multiple devices.
To perform such axially straining experiments, new MEMS structures
were designed and fabricated according to design restrictions such as the
compatibility with dry-CNT transfer methods. Suspended CNT lengths
were between 2 and 4.2 μm with gate distances between 490 nm and 2 μm.
Different designs of the actuators, thermally heated by electrical current,
showed different ability to displace the ends of the electrodes with an
efficiency of between 1 and 2.6 nmA−2. Including semi-conducting
behaviour in FEM simulations explained the displacement response to
current not just for low temperatures, but across the full operation
range.
Straining experiments on the new MEMS platform included the
analysis of the static strain response with gauge factors up to 108 for low
gate biases, isolating the axial straining effect from gate bias straining and
the combination of both.
A central contribution of this work is the detailed modelling of CNT
resonators subject to uniaxial and/or gate bias induced straining. The
modelling framework employs solutions to the nonlinear Duffing equation
via harmonic balancing, a technique that captures both amplitude and
phase behaviour of the resonator’s motional current. By including the
transfercharacteristic directly into to modelling of the current, even more
complex and asymmetric phases and different shapes of resonance peak
were explained. This approach proves indispensable for accurately
describing the interplay between electrostatic (gate) and mechanical (axial)
strain, enabling detailed predictions of device performance. This has been
possible only due to the knowledge of applied strain from the characterized
actuators. The framework also allowed for the quantification of maximum
axial strain of 1.4% before the CNT slipped from the electrodes.
Noch keine Bewertungen vorhanden
Verfassen Sie die erste Bewertung zu diesem Artikel
Helfen Sie anderen Kundinnen und Kunden durch Ihre Meinung.
Kurze Frage zu unserer Seite
Vielen Dank für Ihr Feedback
Wir nutzen Ihr Feedback, um unsere Produktseiten zu verbessern. Bitte haben Sie Verständnis, dass wir Ihnen keine Rückmeldung geben können. Falls Sie Kontakt mit uns aufnehmen möchten, können Sie sich aber gerne an unseren Kund*innenservice wenden.
zum Kundenservice