PEDOT/PSS nanowire

PEDOT PSS nanowire (Figure 10.41) [101,102]. The temperature dependence of the resistance indeed followed Mott VRH for a 1-D system, i.e., p T) oc exp (TMott/T). Tiviott was determined to be 1900 K, which is similar to that of PEDOT PSS thin films. 

Ethanol PEDOT/PSS Nanowires Cond. Nonlinear 10-100% saturation in N2... 

PEDOT PSS, 20-24, 20-45-20-46, 20-49 substituted PEDOTs, 20-25 PEDOT/PSS nanowires, 16-5 Peierls instability, 17-3 Pentacene, 2-2, 2-15, 2-16, 2-17, 2-18 Percolation models, 16-2 Percolation transition, 15-12 Pemigraniline, 7-25 Perturbation, 19-3, 19-11, 19-14 Phase diagram, 17-11-17-12, 17-15, 17-24-17-27 Phenyl-fused EDOT, 13-15-13-16 Phonon scattering, 15-13, 15-30 Phonon-assisted tunneling, 16-4 Phonon-induced delocalization, 15-8, 15-12—15-13, 15-41, 15-51, 15-69 Phosphonic add, 9-18, 9-19... 

Lu, H.-H., et al., 2008. NO gas sensor of PEDOT PSS nanowires by using direct patterning DPN. In Engineering in Medicine and Biology Society, 2008. EMBS 2008. 30th Annual International Conference of the IEEE, pp. 3208-3211. 

Figure 10.6 Procedure for polymer nanowire fabrication. An aqueous PEDOTtPSS solution was spin-coated on a substrate patterned with a 1.3 ym period grating, then coated with a thin Si02 layer and a PDMS homopolymer brush. A PS-PDMS block-copolymer thin film was then spin-coated and solvent-annealed. The self-assembled block-copolymer patterns were transferred into the underlying PEDOT-.PSS film through a series of reactive ion etching steps employing CF4 and O2 plasmas. (Reprinted with permission from Nano Letters, Nanowire Conductive Polymer Gas Sensor Patterned Using Self-Assembled Block Copolymer Lithography by Y. S. Jung et al., 8, 11. Copyright (2008) American Chemical Society)...

Figure 6.37 Dependence of (a) electrical conductivity, Seebeck coefficient, and (b) power factor on the weight fraction of Tellurium nanowires in PEDOT PSS/Te composite film [17].

It was shown that the Seebeck coefficient of the PEDOT PSS/Te hybrid is significantly larger than that of the pure PEDOT PSS polymer. Besides, electrical conductivity of the hybrid films is also higher than those of both the Te nanorods and PEDOT PSS polymer, indicating that the PEDOT PSS protects the Te from oxidation and improves inter particle contact. By varying the Te content, it was found the electrical conductivity and the TE power factor of the composite exhibit a peak at an intermediate nanowire mass fraction, whereas the Seebeck coefficient increases monotonically with increasing Te, as shown in Figure 6.37 [17]. 

It was found that longer nanowires have a larger thermopower but a lower electrical conductivity (Table 6.4). The addition of ethylene glycol (EG) or dimethylsulfoxide (DMSO) can greatly improve the conductivity of PEDOT PSS and decrease the thermopower. As a result, with the addition of a small amount of PEDOTrPSS already infused with 5 vol% DMSO, the power factor can be increased to greater than 100 xW/mK [18]. 

Different electroluminescent device architectures can be developed by means of light-emitting polymer nanofibers. In the simplest case, fibers are just deposited on a hole-injecting layer and capped by a metal cathode. For example, disordered assemblies of PFO nanowires are used within a [glass/ ITO/PEDOT PSS (70 nm)/fibers/Al] prototype structure showing a threshold... 

The improvement in power conversion efficiency (PCE) of plasmonic solar cells is always an urgent problem and short circuit current density is one of the key factors for the PCE. The improvement in the Jsc of plasmonic solar cells is mainly achieved by the introduction of metallic nanoparticles, such as blending Au nanoparticles into the anodic buffer layer or the interconnecting layer that connects two subcells of the tandem plasmonic solar cells [86]. Compared with the metallic NPs, nanowires (NWs) are superior in terms of improving photocurrent, while most of the metallic NWs introducing in cells reported previously were used for the anodic contact of the cells [87]. The improvement of PCE in bulk heterojunction polymer solar cells with active layer P3HT PCBM by introducing 40 nm Au nanoparticles between ITO and PEDOT PSS layer with various concentrations is also observed by Gao et al. [88]. It has been found that both short-circuit current density and PCE increase from 3.50% to 3.81% with 0.9 wt. % Au NPs due to the localized surface plasmon excitation of Au NPs. 

Figure 10.39 An optical micrograph of a wire grown from aqueous EDOT/PSS solution. Inset a scanning electron micrograph of a PEDOT nanowire. The scale bars represent 10 pm except for those in the insets, which denote 500 nm. (Reprinted with permission from Applied Physics Letters, Directional growth of polypyrrole and polythiophene wires by P. S. Thapa, D.J. Yu,J. P. Wicksted eta ., 94, 3 (2009) American Institute of Physics)...

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