Direction‐Selective and Length‐Tunable In‐Plane Growth of Carbon Nanotubes

Abstract

ily connected to an optical fiber obtaining a FOS with a working wavelength of 1.5 lm. On the other hand, the sensing element is widely tailorable, in the sense that one could explore other DBR parameters and metal nanoparticles in order to control the selectivity of the sensing element in different wavelength domains. The underlying physical phenomenon, i.e., the diffusion of solvent molecules in a metal nanoparticle/ polymer composite layer, is indeed poorly understood and depends on several factors, such as the physical and chemical properties of the polymer and the metal nanoparticles.In conclusion, the DBR based on Teflon-like and Au nanoparticle/Teflon-like polymers is a promising sensing element, the attraction of which is essentially threefold: first, the Teflonlike polymer is characterized by important properties such as a remarkable chemical resistance, a high thermal stability, a good flame resistance, and an excellent toughness, which are added to the typical polymer advantages such as low-cost fabrication and immense tailorability; second, the DBR can be easily integrated with an optical fiber, with the possibility of tuning the operation wavelength in the optical telecommunication range; third, the sensor can operate at room temperature. All these properties make this sensor particularly suitable for commercial devices, as well as for use in hostile conditions. Vapor-Sensing Properties: The effects of the surrounding vapor on our sensing DBR were tested by reflectance measurements using a spectrophotometer arranged for experiments in the presence of gas or vapors. The samples were inserted into a glass tube through which flowed synthetic air (20.5 vol.-% O 2 in N 2 ) as carrier gas. The organic vapor was introduced by bubbling synthetic air through the organic liquid and the mixing the saturated synthetic air with the carrier gas to produce the desired concentration. The measurements were carried out at room temperature. Direction-Selective and Length-Tunable In-Plane Growth of Carbon Nanotubes** By Anyuan Cao, Rajashree Baskaran, Matthew J. Frederick, Kimberly Turner, Pulickel M. Ajayan, and Ganapathiraman Ramanath* Carbon nanotubes (CNTs) are fascinating one-dimensional molecular structures that can be either metallic or semiconducting, depending on their diameter and helicity.

Site‐Selective Functionalization of Carbon Nanotubes

“…Multiwalled CNTs used in this study were synthesized either by chemical vapor deposition [3] or by the arc-discharge method. The details of the modification of CNTs carried are described below.…”

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Carbon nanotubes (CNTs) are attractive nanodevice components due to their unique electronic structure, molecular dimensions, and shape.[1] The remarkable structural integrity of CNTs [2] and progress in techniques to assemble them into mesoarchitectures [3] make them attractive templates to assemble other low-dimensional structures (e.g., nanoparticles, biomolecules) to create hybrid nano-and mesostructures, composites, [4] and devices. Hybrid structures allow access to new electronic, electrical, and magnetic properties and provide additional degrees of freedom that enable the assembly and interconnection of nanostructures into architectures for nanodevice fabrication.

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Aligned Carbon Nanotube Arrays for Degradation‐Resistant, Intimate Contact in Micromechanical Devices

“…When a driving voltage ( V G ) was applied to the gate, the shuttle was actuated toward the off-state by an dispersed CNTs [ 27 ] due to scalability on large area and facile fabrication of suspended CNTs across the microstructures. [ 28 ] During the CVD process, pretreating the catalysts [ 29 ] or preheating the precursors [ 30 ] could reduce the synthetic temperature for CNTs to secure integrated circuit process-compatibility. Figure 2 a is a scanning electron microscopy (SEM; Hitachi S-4300) image with the electrical circuit confi guration for the operation of the switch.…”

In-situ Opening Aligned Carbon Nanotubes and Applications for Device Assembly and Field Emission

“…However, the CNTs' area distribution density is not high enough to decrease the electrical resistance. In addition, a method for the growth of CNT arrays by the gas-phase delivery of a xylene-ferrocene mixture has been demonstrated [17,18]. In this process, Fe catalyst particles are produced continuously during CNT growth.…”