High Quality Carbon Nanotubes on Conductive Substrates Grown at Low Temperatures

Ahmad, Muhammad, Anguita, Jose, Stolojan, Vlad, Corless, T, Chen, J, Carey, James and Silva, S (2015) High Quality Carbon Nanotubes on Conductive Substrates Grown at Low Temperatures Advanced Functional Materials, 25 (28). pp. 4419-4429.

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Abstract

For carbon nanotubes (CNTs) to be exploited in electronic applications, the growth of high quality material on conductive substrates at low temperatures (<450°C) is required. CNT quality is known to be strongly degraded when growth is conducted on metallic surfaces, particularly at low temperatures using conventional chemical vapor deposition (CVD). Here, the production of high quality vertically-aligned CNTs at low substrate temperatures (350–440°C) on conductive TiN thin film using photo-thermal CVD is demonstrated by confining the energy required for growth to just the catalyst using an array of optical lamps and by optimizing the thickness of the TiN under-layer. The thickness of the TiN plays a crucial role in determining various properties including diameter, material quality, number of shells, and metallicity. The highest structural quality with a visible Raman D- to G-band intensity ratio as low as 0.13 is achieved for 100 nm TiN thickness grown at 420°C; a record low value for low temperature CVD grown CNTs. Electrical measurements of high density CNT arrays show the resistivity to be 1.25 × 10-2 Ω cm representing some of the lowest values reported. Finally, broader aspects of using this approach as a scalable technology for carbon nanomaterial production are also discussed.

Item Type:	Article
Divisions :	Faculty of Engineering and Physical Sciences > Electronic Engineering
Authors :	Name Email ORCID Ahmad, Muhammad muhammad.ahmad@surrey.ac.uk UNSPECIFIED Anguita, Jose J.Anguita@surrey.ac.uk UNSPECIFIED Stolojan, Vlad V.Stolojan@surrey.ac.uk UNSPECIFIED Corless, T UNSPECIFIED UNSPECIFIED Chen, J UNSPECIFIED UNSPECIFIED Carey, James David.Carey@surrey.ac.uk UNSPECIFIED Silva, S S.Silva@surrey.ac.uk UNSPECIFIED
Date :	8 June 2015
Identification Number :	10.1002/adfm.201501214
Copyright Disclaimer :	This is the accepted version of the following article: Ahmad M, Anguita JV, Stolojan V, Corless T, Chen JS, Carey JD, Silva SRP High Quality Carbon Nanotubes on Conductive Substrates Grown at Low Temperatures. Advanced Functional Materials, which has been published in final form at http://dx.doi.org/10.1002/adfm.201501214
Depositing User :	Symplectic Elements
Date Deposited :	03 Jul 2015 10:35
Last Modified :	11 Jul 2017 17:38
URI:	http://epubs.surrey.ac.uk/id/eprint/807879

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