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Photoresponse in large area multiwalled carbon nanotube/polymer nanocomposite films

2009; American Institute of Physics; Volume: 94; Issue: 4 Linguagem: Inglês

10.1063/1.3075957

1520-8842

Paul Stokes, Liwei Liu, Jianhua Zou, Lei Zhai, Qun Huo, Saiful I. Khondaker,

Transition Metal Oxide Nanomaterials

We present a near IR photoresponse study of large area multiwalled carbon nanotube/poly(3-hexylthiophene)-block-polystyrene polymer (MWNT/P3HT-b-PS) nanocomposite films for different loading ratio of MWNT into the polymer matrix. We show that the photocurrent strongly depends on the position of the laser spot with maximum photocurrent occurring at the metal-film interface. In addition, compared to the pure MWNT film, the photoresponse is much larger in the MWNT/polymer composite films. The time constant for the photoresponse is slow and varies between 0.6 and 1.2 s. We explain the photoresponse by Schottky barrier modulation at the metal-film interface.