Quality Control of CNT Forests via EM Probing
نویسندگان
چکیده
In this work, a study of CNT length distribution estimation is presented. The method involves the use of RF signals to excite the CNT forest at frequencies. The observations are then processed with an integer program solver to estimate the distribution of CNT lengths of an equivalent system. The numerical studies confirm the accuracy of this approach to estimate the distribution of CNT lengths in a forest.
منابع مشابه
Population growth dynamics of carbon nanotubes.
Understanding the population growth behavior of filamentary nanostructures, such as carbon nanotubes (CNTs), is hampered by the lack of characterization techniques capable of probing statistical variations with high spatial resolution. We present a comprehensive methodology for studying the population growth dynamics of vertically aligned CNT forests, utilizing high-resolution spatial mapping o...
متن کاملEngineering vertically aligned carbon nanotube growth by decoupled thermal treatment of precursor and catalyst.
We study synthesis of vertically aligned carbon nanotube (CNT) "forests" by a decoupled method that facilitates control of the mean diameter and structural quality of the CNTs and enables tuning of the kinetics for efficient growth to forest heights of several millimeters. The growth substrate temperature (T(s)) primarily determines the CNT diameter, whereas independent and rapid thermal treatm...
متن کاملMechanical coupling limits the density and quality of self-organized carbon nanotube growth.
Aligned carbon nanotube (CNT) structures are promising for many applications; however, as-grown CNT "forests" synthesized by chemical vapor deposition (CVD) are typically low-density and mostly comprise tortuous defective CNTs. Here, we present evidence that the density and alignment of self-organized CNT growth is limited by mechanical coupling among CNTs in contact, in combination with their ...
متن کاملWide Range Control of Microstructure and Mechanical Properties of Carbon Nanotube Forests: A Comparison Between Fixed and Floating Catalyst CVD Techniques
© 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim Vertically aligned carbon nanotube (CNT) forests may be used as miniature springs, compliant thermal interfaces, and shock absorbers, and for these and other applications it is vital to understand how to engineer their mechanical properties. Herein is investigated how the diameter and packing density within CNT forests govern their deformation b...
متن کاملCollective Mechanisms Limiting the Indefinite Growth of Carbon Nanotube Assemblies
While carbon nanotubes (CNTs) have been produced industrially in ton-scale quantities for nearly two decades, scalable manufacturing processes that precisely control the structure, length, and alignment of CNTs are needed to realize the exceptional properties of CNTs at larger scales. Specifically, vertically aligned CNT forests are a model system for further understanding what limits the growt...
متن کامل