Assembling Carbon Nanotube Architectures

Abstract

Well-defined multiwalled carbon nanotube structures are generated on stainless steel AISI 304 (EN AW 1.4301) by chemical vapor deposition. Pulsed laser-induced dewetting (PLiD) of the surface, by 532 nm nanosecond laser pulses, is utilized for the preparation of metal oxide nanoparticle fields with a defined particle number per area. The reduction of the precursor particles is achieved in an Ar/H2 (10% H2) atmosphere at 750 °C, thereby generating catalytic nanoparticles (c-NPs) for carbon nanotube (CNT) growth. Ethylene is used as a precursor gas for CNT growth. CNT lengths and morphology are directly related to the c-NP aerial density, which is dependent on the number of dewetting cycles during the PLiD process. Within a narrow window of c-NP per area, vertically aligned carbon nanotubes of great lengths are obtained. For more intense laser treatments, three-dimensional dewetting occurs and results in the formation of cauliflower-like structures. The laser process enables the creation of all kinds of CNT morphologies nearby on the microscale.

Bio-inspired hierarchical nanoporous carbon derived from water spinach for high-performance supercapacitor electrode materials

“…4a, the CV curves at different scan rates varying from 2 to 100 mV s À1 indicate an approximately rectangular shape with slight faradaic humps, which conrms the combination of double-layer capacitive and pseudocapacitive behavior caused by the existence of active oxygen and phosphorous heteroatoms. 60 While the current density increases along with the scan rate, the CV proles still retain a nearrectangle shape at various scan rates, which demonstrates the excellent capacitive and behavior rate performance as well as the faster kinetics in the porous carbon due to the openness in its structure, which favors fast ion transportation inside the pores. 61 At 100 mV s À1 , the CV curves still manifest the EDLC shape along with a large output current, owing to an increase in ion transport and ion adsorption kinetics aer hetero atom doping.…”

Single–atom catalysts based on Fenton-like/peroxymonosulfate system for water purification: design and synthesis principle, performance regulation and catalytic mechanism

“…, –COOH and –OH), such as graphene oxide (GO) and carbon nanotubes (CNT). 116–119 The coordination of the electronegative C atoms plays the role of fixing and isolating metal atoms. This not only realizes the stability of the chemical structure of Fenton-like SACs and the individual transition metal elements and makes the catalyst more durable and significantly improves the atomic utilization rate, but also improves the overall conductivity of the catalyst, achieving the purpose of rapid electron transfer in Fenton-like catalysis.…”

Bioinspired carbon nanotube-based materials

“…16,[75][76][77][78] Piling or stacking individual CNTs also results in the formation of patterned architectures in bioinspired CNT-based materials with interesting behaviors (e.g., high strength and toughness, and high dry adhesion). 79 More importantly, the elaboration of other characteristics in bioinspired CNT-based materials is related to the natural structure of CNTs.…”

“…, high strength and toughness, and high dry adhesion). 79 More importantly, the elaboration of other characteristics in bioinspired CNT-based materials is related to the natural structure of CNTs.…”