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Pregled bibliografske jedinice broj: 332987

Variable-range-hopping exponents 1/2, 2/5 and 1/4 in HCl-doped polyaniline pellets


Novak, Mario; Kokanović, Ivan; Babić, Dinko; Baćani, Mirko; Tonejc, Antun
Variable-range-hopping exponents 1/2, 2/5 and 1/4 in HCl-doped polyaniline pellets // Synthetic metals, 159 (2009), 649-653 doi:10.1016/j.synthmet.2008.12.010 (međunarodna recenzija, članak, znanstveni)


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Naslov
Variable-range-hopping exponents 1/2, 2/5 and 1/4 in HCl-doped polyaniline pellets

Autori
Novak, Mario ; Kokanović, Ivan ; Babić, Dinko ; Baćani, Mirko ; Tonejc, Antun

Izvornik
Synthetic metals (0379-6779) 159 (2009); 649-653

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
polymers; organic compounds; physical properties of polymers

Sažetak
We present a study of the variable-range-hopping (VRH) charge transport in polyaniline pellets doped with HCl over a wide range. Increase of the doping not only enhances the electrical conductivity $\sigma$ but also weakens the disorder, which affects the VRH mechanism. This is revealed in the $\sigma$ vs temperature ($T$) characteristics $\sigma \propto \exp [ - (T_0/T)^{; ; ; ; \alpha}; ; ; ; ]$, where $\alpha$ and $T_0$ carry information on the underlying physics. Below $T \sim 200$ K, $\alpha$ undergoes a significant disorder-dependent change at $\sim 60$ \% of the full doping: $\alpha = 1/2$ for lower doping, whereas more-doped samples exhibit $\alpha = 2/5$. From $T \sim 200$ K up to room temperature, most of the samples (i.e., those doped below 80 \%) exhibit $\alpha = 1/4$ regardless of the corresponding $\alpha$ at low $T$. These results can be to a large extent explained by the VRH theory of Fogler, Teber and Shklovskii (FTS) [Phys. Rev. B {; ; ; ; \bf 69}; ; ; ; (2004), p. 035413]. In particular, $\alpha = 1/2, 2/5, 1/4$ are therein predicted for three dimensions, together with crossovers between these values in response to changes in disorder and/or $T$. The doping (disorder) dependence of $T_0$ for a given $\alpha=1/2$ or $2/5$ also follows the FTS predictions reasonably well. The appearance of $\alpha=1/4$ at high $T$ can be understood from an analysis of the energy scales relevant to VRH as described by the FTS model.

Izvorni jezik
Engleski

Znanstvena područja
Fizika



POVEZANOST RADA


Projekti:
119-0982886-1009 - Struktura i svojstva posebnih nanomaterijala dobivenih suvremenim tehnikama (Tonejc, Antun, MZOS ) ( POIROT)
119-1191458-1008 - Električna i magnetska svojstva odabranih anorganskih i organskih materijala (Kokanović, Ivan, MZOS ) ( POIROT)

Ustanove:
Prirodoslovno-matematički fakultet, Zagreb

Profili:

Avatar Url Dinko Babić (autor)

Avatar Url Mario Novak (autor)

Avatar Url Antun Tonejc (autor)

Avatar Url Mirko Baćani (autor)

doi

Citiraj ovu publikaciju

Novak, Mario; Kokanović, Ivan; Babić, Dinko; Baćani, Mirko; Tonejc, Antun
Variable-range-hopping exponents 1/2, 2/5 and 1/4 in HCl-doped polyaniline pellets // Synthetic metals, 159 (2009), 649-653 doi:10.1016/j.synthmet.2008.12.010 (međunarodna recenzija, članak, znanstveni)
Novak, M., Kokanović, I., Babić, D., Baćani, M. & Tonejc, A. (2009) Variable-range-hopping exponents 1/2, 2/5 and 1/4 in HCl-doped polyaniline pellets. Synthetic metals, 159, 649-653 doi:10.1016/j.synthmet.2008.12.010.
@article{article, year = {2009}, pages = {649-653}, DOI = {10.1016/j.synthmet.2008.12.010}, keywords = {polymers, organic compounds, physical properties of polymers}, journal = {Synthetic metals}, doi = {10.1016/j.synthmet.2008.12.010}, volume = {159}, issn = {0379-6779}, title = {Variable-range-hopping exponents 1/2, 2/5 and 1/4 in HCl-doped polyaniline pellets}, keyword = {polymers, organic compounds, physical properties of polymers} }
@article{article, year = {2009}, pages = {649-653}, DOI = {10.1016/j.synthmet.2008.12.010}, keywords = {polymers, organic compounds, physical properties of polymers}, journal = {Synthetic metals}, doi = {10.1016/j.synthmet.2008.12.010}, volume = {159}, issn = {0379-6779}, title = {Variable-range-hopping exponents 1/2, 2/5 and 1/4 in HCl-doped polyaniline pellets}, keyword = {polymers, organic compounds, physical properties of polymers} }

Časopis indeksira:


  • Current Contents Connect (CCC)
  • Web of Science Core Collection (WoSCC)
    • Science Citation Index Expanded (SCI-EXP)
    • SCI-EXP, SSCI i/ili A&HCI
  • Scopus


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