University of Oulu

Sridhar, S. & Tiwary, C. S. & Sirota, B. & Ozden, S. & Kalaga, K. & Choi, W. & Vajtai, Robert & Kordas, K. & Ajayan, P. M. (2018). One step process for infiltration of magnetic nanoparticles into CNT arrays for enhanced field emission. In Advanced materials interfaces. doi: 10.1002/admi.201701631

One step process for infiltration of magnetic nanoparticles into CNT arrays for enhanced field emission

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Author: Sridhar, Srividya1; Tiwary, Chandra Sekhar1,2; Sirota, Benjamin3;
Organizations: 1Department of Materials Science and NanoEngineering, Rice University, Houston, TX 77005, USA
2Materials Science and Engineering, Indian Institute of Technology, Gandhinagar 382355, India
3Dr. B. Sirota, Prof. W. Choi Department of Material Science and Engineering, University of North Texas, Denton, TX 76203, USA
4Microelectronics Research Unit, University of Oulu, P.O. Box 4500, FI-90014 Oulu, Finland
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 1.8 MB)
Persistent link: http://urn.fi/urn:nbn:fi-fe201902286569
Language: English
Published: John Wiley & Sons, 2018
Publish Date: 2019-06-28
Description:

Abstract

The complexities and functionalities of carbon nanotube (CNT) architectures can be enhanced even further by the addition of nanoparticles of different kinds. Here, a simple and easily scalable energy efficient infiltration technique is demonstrated to incorporate iron oxide (Fe3O4) particles into aligned forests of CNTs grown by chemical vapor deposition. Scanning electron microscopy and in situ confocal microscopy confirm the presence of Fe3O4 and also explain the mechanism of infiltration and entrapment in the nanotube films. The obtained hybrid films are demonstrated to be excellent field emitters. The infiltration of nanoparticle results in an order of magnitude improvement in the turn‐on field, which can be attributed to several advantageous factors such as reduced screening effects, improved conductivity, and local electric field enhancement in the proximity of the particles. The present method is generic and thus can be applied to other magnetic particles and porous host materials aiming at innovative sensor, electrical and environmental applications.

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Series: Advanced materials interfaces
ISSN: 2196-7350
ISSN-E: 2196-7350
ISSN-L: 2196-7350
Volume: 5
Issue: 15
Article number: 1701631
DOI: 10.1002/admi.201701631
OADOI: https://oadoi.org/10.1002/admi.201701631
Type of Publication: A1 Journal article – refereed
Field of Science: 221 Nanotechnology
Subjects:
Copyright information: © 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. This is the peer reviewed version of the following article: Sridhar, S. & Tiwary, C. S. & Sirota, B. & Ozden, S. & Kalaga, K. & Choi, W. & Vajtai, Robert & Kordas, K. & Ajayan, P. M. (2018). One step process for infiltration of magnetic nanoparticles into CNT arrays for enhanced field emission. In Advanced materials interfaces. doi: 10.1002/admi.201701631, which has been published in final form at http://dx.doi.org/10.1002/admi.201701631. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.