Anisotropic Polyaniline/SWCNT Composite Films Prepared by in Situ Electropolymerization on Highly Oriented Polyethylene for High-Efficiency Ammonia Sensor

Tingcong Jiang; Pengbo Wan; Zhongjie Ren; Shouke Yan

doi:10.1021/acsami.9b13336

Anisotropic Polyaniline/SWCNT Composite Films Prepared by in Situ Electropolymerization on Highly Oriented Polyethylene for High-Efficiency Ammonia Sensor

ACS Appl Mater Interfaces. 2019 Oct 16;11(41):38169-38176. doi: 10.1021/acsami.9b13336. Epub 2019 Oct 7.

Authors

Tingcong Jiang¹, Pengbo Wan¹, Zhongjie Ren¹, Shouke Yan^{1

2}

Affiliations

¹ State Key Laboratory of Chemical Resource Engineering, College of Materials Science and Engineering , Beijing University of Chemical Technology , Beijing 100029 , P. R. China.
² Key Laboratory of Rubber-Plastics, Ministry of Education , Qingdao University of Science & Technology , Qingdao 266042 , P. R. China.

PMID: 31552732
DOI: 10.1021/acsami.9b13336

Abstract

Anisotropic composite films of polyaniline (PANI) with single-walled carbon nanotube (SWCNT) were prepared by in situ electropolymerization on highly oriented high-density polyethylene (HDPE) films. Polarized UV-vis and Raman spectra confirm the anisotropic arrangement of PANI molecular chains in the composite films. The conductivities of 16.6 ± 0.2 and 2.07 ± 0.2 S cm^-1 have been obtained for doped PANI/0.8 wt % SWCNT measured along and perpendicular to the direction of the HDPE molecular chain, respectively. The response of PANI/0.8 wt % SWCNT films used as ammonia sensors is much higher along the chain direction of HDPE than that perpendicular to the chain direction of HDPE with an anisotropic ratio of 1.8 at 100 ppm ammonia. This is attributed to the well-ordered array of PANI/0.8 wt % SWCNT induced by the oriented HDPE films. Moreover, the high ammonia response for PANI/0.8 wt % SWCNT may be attributed to the charge-transfer effect between PANI and SWCNT.

Keywords: SWCNT; ammonia sensor; anisotropic; electrodeposition; polyaniline.