Characterization of "Highly Conducting" Polyacetylene

Abstract

The large increase in conductivity observed when polyacetylene is exposed to iodine vapor has fascinated scientists since the late 1970s.1 When conductivities in the metallic regime were reported by Naarmann et al.2 and Tsukamoto,3 interest in this conducting polymer was rekindled. As 10® S/cm is the highest reported conductivity for any organic conducting polymer, a greater understanding of the factors that influence the high conductivity in polyacetylene is critical. One of the factors contributing to the high conductivity was thought to be the amount of sp3 sites in the sp2 chain. The sp3 content was reported2*3 to be lower in N-(CH)X than in traditional Shirakawa

Simultaneous electronic and ionic conduction in ionic liquid imbibed polyacetylene-like conjugated polymer films

“…2) exhibited peaks at 2923 and 2855 cm À1 , in agreement with these previous reports. 35,36 A lower intensity shoulder observed at 1134 cm À1 , is attributed to the C-C stretching of polyacetylene. 37 The IR spectra of the of the polyene lms of the present study showed features similar to those in the spectrum of b-carotene, a small molecule analogue of p-conjugated polymers.…”

“…Arbuckle et al 35 reported that the C-H stretch vibrations in Naarmann polyacetylene occurred at 2959, 2929, and 2871 cm À1 , and in the 2960-2850 cm À1 range in Tsukamoto polyacetylene. Chen et al 36 studied polyacetylene lms with high trans-polyene content and observed a strong peak at 3013 cm À1 , attributed to the C-H stretch vibrations.…”

Comparing and Contrasting the Effects of Iodine Doping on Different Types of Polyacetylene Films

“…When Naarmann et al . and subsequently Tsukamoto et al reported conductivities as high as 10 5 S/cm for stretched polyacetylene films, interest in this air-sensitive conducting polymer was renewed. − In order to compare these three types of polyacetylene, we have synthesized and characterized both free-standing films and thin films on quartz crystal substrates. − …”

“…[5][6][7] In order to compare these three types of polyacetylene, we have synthesized and characterized both free-standing films and thin films on quartz crystal substrates. [8][9][10] We have characterized undoped (nonconducting) freestanding films of S-(CH) x (traditional Shirakawa polyacetylene 11 ), N-(CH) x (Naarmann et al 3 ), and ν- (CH) x (Tsukamoto et al 4 ) by 13 C CPMAS NMR, FT-IR, resonance Raman spectroscopy (RRS), and scanning electron microscopy (SEM). 9,10 There is a remarkable similarity between the three types.…”

“…[8][9][10] We have characterized undoped (nonconducting) freestanding films of S-(CH) x (traditional Shirakawa polyacetylene 11 ), N-(CH) x (Naarmann et al 3 ), and ν- (CH) x (Tsukamoto et al 4 ) by 13 C CPMAS NMR, FT-IR, resonance Raman spectroscopy (RRS), and scanning electron microscopy (SEM). 9,10 There is a remarkable similarity between the three types. Other studies have also indicated that the electronic properties of N-(CH) x are similar to those of S-(CH) x .…”