Abstract
Promising electrical properties of single-walled carbon nanotubes (SWCNTs) open a spectrum of applications for this material. As the SWCNT electronic characteristics respond well to the presence of various analytes, this makes them highly sensitive sensors. In this contribution, selected organophosphorus compounds were detected by studying their impact on the electronic properties of the nanocarbon network. The goal was to untangle the n-doping mechanism behind the beneficial effect of organic phosphine derivatives on the electrical conductivity of SWCNT networks. The highest sensitivity was obtained in the case of the application of 1,6-Bis(diphenylphoshpino)hexane. Consequently, free-standing SWCNT films experienced a four-fold improvement to the electrical conductivity from 272 ± 21 to 1010 ± 44 S/cm and an order of magnitude increase in the power factor. This was ascribed to the beneficial action of electron-rich phenyl moieties linked with a long alkyl chain, making the dopant interact well with SWCNTs.
Highlights
The discovery of carbon nanomaterials such as carbon nanotubes (CNTs) [1,2] and graphene [3] created new perspectives for materials science
We studied how the presence of phosphorus may be monitored by the application of electrically conducting sensors from SWCNT films
We began the analysis by investigating the crystallinity of evaluated SWCNT networks We began the analysis by investigating the crystallinity of evaluated SWCNT netby Raman spectroscopy (Figure 2)
Summary
The discovery of carbon nanomaterials such as carbon nanotubes (CNTs) [1,2] and graphene [3] created new perspectives for materials science. Ever since the remarkable electrical [4,5,6], mechanical [7,8,9], thermal [10,11,12], and optical [13,14,15,16] characteristics were first observed, the research community focused efforts to apply these nanostructures in a broad spectrum of applications Due to their favorable electrical and mechanical properties, able to offer simultaneously high strength and flexibility [17,18], they became interesting components for flexible electronics or low grade heat harvesting [19].
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