Polyaniline photoluminescence

Figure 8.6 Photoluminescence spectra of polyanUine and polyaniline/carbon nanotube nanocomposites. Reprinted with permission from [47] Copyright (2010) John WUey Sons.

The photoluminescence of polyaniline has been studied as a function of the polymer redox state. It was stated that each of the three PANI species have fluorescent emissions with different quantum yields. When conductive domains are present, the emission fi-om excitons located either inside these domains or near to them is efficiently quenched [40], Organic electroluminescent devices (LED s) are a possible alternative to liquid crystal displays and cathodic tubes, especially for the development of large displays. The principal setup for a polymeric LED is ITO/light-emitting polymer/metal. A thin ITO electrode on a transparent glass or polymeric substrate serves as the anode, while metals such as Al, Ca or Mg are used as cathode materials. After applying an electric field, electrons and holes are injected into the polymer. The formation of e /h" " pairs leads to the emission of photons. One of most important opportunities to follow from the use of poly-... 

It is possible to prepare three typical ti-conjugated polymers, polythiophene, polypyrrole and polyaniline, by means of electrochemical oxidation of the corresponding monomers in the presence of an electrolyte at ambient temperature. In 1990, Canham discovered that photoluminescent porSi materials could be formed by an electrochemical method that used a p-type c-Si wafer. Electrochemical methods are among the safest, most environmentally friendly and technically favorable processes eompared to Na/Li-based Wurtz coupling reactions (Chart 13.10). ... 

Chan S, Kwon S, Koo TW, Lee LP, Berlin AA (2003) Surface-enhanced Raman scattering of small molecules from silver-coated silicon nanopores. Adv Mater 15 1595 Chen LL, Tang ZK, Shi MJ (2013) Microstructures and photoluminescence of electrochemically-deposited ZnO films on porous silicon and silicon. Key Eng Mater 538 30 Chiboub N, Boukherroub R, Gabouze N, Moulay S, Naar N, Lamouri S, Sam S (2010a) Covalent grafting of polyaniline onto aniline-terminated porous silicon. Opt Mater 32 748... 

The photoluminescence of polyaniline film in air after 10 potential cycles was very weak. Therefore, it was thought that the detected light as shown in Fig. 6 was mainly due to scattered light. 

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