Preparation of modified MWCNTs-doped PANI nanorods by oxygen plasma and their ammonia-sensing properties
- PDF / 747,843 Bytes
- 8 Pages / 595.276 x 790.866 pts Page_size
- 57 Downloads / 188 Views
Preparation of modified MWCNTs-doped PANI nanorods by oxygen plasma and their ammonia-sensing properties Hai-Ying Du • Jing Wang • Peng-Jun Yao Yu-Wen Hao • Xiao-Gan Li
•
Received: 23 October 2012 / Accepted: 11 January 2013 / Published online: 24 January 2013 Ó Springer Science+Business Media New York 2013
Abstract Multi-wall carbon nanotubes (MWCNTs)doped polyaniline (PANI) nanopowders were prepared by chemical oxidation polymerization. Then, the MWCNTsdoped PANI nanopowders were modified by a radio frequency (RF) oxygen plasma source. The morphology and structure of modified MWCNTs-doped PANI nanorods were analyzed by SEM and FI-IR. Gas sensors were fabricated based on plasma modified MWCNTs-doped PANI nanorods to detect ammonia at room temperature. The response amplitude of the gas sensor based on modified MWCNTs-doped PANI nanorods was much higher than those of MWCNTs-doped PANI nanopowders and pure PANI nanopowders sensors, respectively, in ammonia concentration range of 10–150 ppm. Cross responses of modified MWCNTs-doped PANI nanorods sensor to ammonia, ethanol, formaldehyde, and toluene were tested. The sensor showed good selectivity and stability. The sensing mechanism of modified MWCNTs-doped PANI nanorods gas sensor was analyzed.
H.-Y. Du J. Wang (&) P.-J. Yao Y.-W. Hao X.-G. Li School of Electronic Science and Technology, Dalian University of Technology, Dalian 116023, People’s Republic of China e-mail: [email protected] H.-Y. Du Department of Electromechanical Engineering & Information, Dalian Nationalities University, Dalian 116600, People’s Republic of China P.-J. Yao School of Educational Technology, Shenyang Normal University, Shenyang 110034, People’s Republic of China
Introduction Intrinsically conducting polymers, including polyacetylene [1], polyaniline (PANI) [2], polypyrrole [3], polythiophene [4], poly(p-phenylene-vinylene), etc., are termed intrinsically conducting polymers that possess the electrical, electronic, magnetic, and optical properties of a metal while retaining the mechanical property, processability, etc., commonly associated with a conventional polymer, and more commonly known as ‘‘synthetic metals’’ [5]. Among many conducting polymers, PANI is generally recognized as one of the most important conducting polymers, and has a great potential for the commercial application because of its unique electrical and optical properties as well as its ease of preparation and excellent environment stability [6–10]. Since the discovery of carbon nanotubes (CNTs) [11], multi-walled (MWCNTs) and single-walled carbon nanotubes (SWCNTs) have exhibited outstanding chemical stability, superior mechanical strength, unique electrical, and thermal conductivity combined with non-linear optical properties [12, 13]. More and more researchers have been attracted in exploring possible applications of carbon nanotubes with good electrical and mechanical properties, such as structure-reinforcing materials, electrical and optical nanodevices, catalysis, hydrogen storage, etc. [14–19]. Owing t
Data Loading...
