Controlling the diameter of aligned single-walled carbon nanotubes on quartz via catalyst reduction time

Journal article


Publication Details

Author(s): Schweiger M, Schaudig M, Gannott F, Killian M, Bitzek E, Schmuki P, Zaumseil J
Journal: Carbon
Publication year: 2015
Volume: 95
Pages range: 452-459
ISSN: 0008-6223


Abstract

One of the main objectives of chemical vapor deposition (CVD) growth of single-walled carbon nanotubes (SWCNT) is control over their diameter and type (metallic or semiconducting). Here, we investigate the evolution of iron catalyst particles on quartz substrates depending on the duration of the reduction step with hydrogen and its effect on the growth of horizontally aligned SWCNT. We find a strong dependence of catalyst particle size and size distribution on the initial iron film thickness and the reduction time at 630 °C. Initial decrease of the particle size is followed by an unexpected increase. Statistical analysis of the Raman radial breathing modes of the SWCNT over large areas gave reliable and reproducible diameter distributions that correlated directly with the catalyst particle size distributions. By changing the reduction time it was possible to reproducibly shift the average SWCNT diameter from 1.5 ($±$0.3) nm to 1.2 ($±$0.2) nm while maintaining a nanotube density of 5--6 SWCNT/\textgreekmm. In order to describe the evolution of the particle size during the reduction process at this particular temperature, we propose a model that includes the diffusion of iron into the quartz and its re-emergence.


FAU Authors / FAU Editors

Bitzek, Erik Prof. Dr.-Ing.
Professur für Werkstoffwissenschaften (Simulation und Werkstoffeigenschaften)
Gannott, Florentina Dr.-Ing.
Lehrstuhl für Werkstoffwissenschaften (Polymerwerkstoffe)
Killian, Manuela Dr.-Ing.
Lehrstuhl für Werkstoffwissenschaften (Korrosion und Oberflächentechnik)
Schmuki, Patrik Prof. Dr.
Lehrstuhl für Werkstoffwissenschaften (Korrosion und Oberflächentechnik)
Zaumseil, Jana Prof.
Professur für Nano-Elektronik


Additional Organisation
Exzellenz-Cluster Engineering of Advanced Materials


Research Fields

D Catalytic Materials
Exzellenz-Cluster Engineering of Advanced Materials
A3 Multiscale Modeling and Simulation
Exzellenz-Cluster Engineering of Advanced Materials


How to cite

APA:
Schweiger, M., Schaudig, M., Gannott, F., Killian, M., Bitzek, E., Schmuki, P., & Zaumseil, J. (2015). Controlling the diameter of aligned single-walled carbon nanotubes on quartz via catalyst reduction time. Carbon, 95, 452-459. https://dx.doi.org/10.1016/j.carbon.2015.08.058

MLA:
Schweiger, Manuel, et al. "Controlling the diameter of aligned single-walled carbon nanotubes on quartz via catalyst reduction time." Carbon 95 (2015): 452-459.

BibTeX: 

Last updated on 2019-14-03 at 11:56