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Influence of semiconductor and metal nanoparticles on the dielectric properties of ionic matrix cadmium octanoate.

Zhulai D, Fedorenko D, Kovalchuk A, Bugaychuk S, Klimusheva GV, Mirnaya TA - Nanoscale Res Lett (2015)

Bottom Line: The electrical conductivity anisotropy confirms the structural anisotropy of the nanocomposites.The conductivity of the nanocomposite along the cation-anion layers is higher by 2 orders of magnitude than that across the cation-anion layers.Basing on the experimental data, we proposed the simple model of the charge carriage process.

View Article: PubMed Central - PubMed

Affiliation: Institute of Physics of National Academy of Sciences of Ukraine, Nauky prosp., 46, Kyiv, 03028 Ukraine.

ABSTRACT
Dielectric properties of ionic composites consisted of cadmium octanoate matrix and semiconductor or metal nanoparticles have been investigated. The nanoparticles of different nature (semiconductor CdS, metal Au, and metal core-semiconductor shell Au-CdS) were chemically synthesized in the smectic A phase of (Cd(+2)(C7H15COO)(-2), CdC8) that was used as a nanoreactor. These nanocomposites are very stable and well ordered; the size and shape of the nanoparticles (NPs) are well controlled during the synthesis. The main aim of the research was to examine the influence of nanoparticles on the dielectric properties of ionic matrix, which has smectic A ordered structure. Electrical characteristics were investigated at different temperatures, which correspond to different phases of the material. The conductivity of nanocomposites has an activation nature. The electrical conductivity anisotropy confirms the structural anisotropy of the nanocomposites. The conductivity of the nanocomposite along the cation-anion layers is higher by 2 orders of magnitude than that across the cation-anion layers. Basing on the experimental data, we proposed the simple model of the charge carriage process.

No MeSH data available.


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Temperature dependence of conductivityσ⊥. 1, CdC8; 2, CdC8 + 2% CdS; 3, CdC8 + 4% CdS; 4, CdC8 + 2% Au; 5, CdC8 + 4% Au; 6, CdC8 + 4% Au + 2% CdS; vertical line marked the phase transition temperature.
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Fig5: Temperature dependence of conductivityσ⊥. 1, CdC8; 2, CdC8 + 2% CdS; 3, CdC8 + 4% CdS; 4, CdC8 + 2% Au; 5, CdC8 + 4% Au; 6, CdC8 + 4% Au + 2% CdS; vertical line marked the phase transition temperature.

Mentions: The electrical conductivity along cation-anion layers (σII; Figure 4) and across them (σ⊥; Figure 5) was measured in samples with different concentrations of nanoparticles. We used the following concentrations: semiconductor CdS were 2, 4, and 6 mol%, metal Au 2 and 4 mol%, and metal core-semiconductor shell 4 mol% Au + 2 mol% CdS. The temperature was changed in range from a room temperature up to 150°C. The results are shown in Figure 4. It is clearly seen that the conductivity is a bit larger in the samples with the larger concentration of the NPs. Also, the conductivity along the cation-anion layers is by 2 orders of magnitude higher than that across them.Figure 4


Influence of semiconductor and metal nanoparticles on the dielectric properties of ionic matrix cadmium octanoate.

Zhulai D, Fedorenko D, Kovalchuk A, Bugaychuk S, Klimusheva GV, Mirnaya TA - Nanoscale Res Lett (2015)

Temperature dependence of conductivityσ⊥. 1, CdC8; 2, CdC8 + 2% CdS; 3, CdC8 + 4% CdS; 4, CdC8 + 2% Au; 5, CdC8 + 4% Au; 6, CdC8 + 4% Au + 2% CdS; vertical line marked the phase transition temperature.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4385103&req=5

Fig5: Temperature dependence of conductivityσ⊥. 1, CdC8; 2, CdC8 + 2% CdS; 3, CdC8 + 4% CdS; 4, CdC8 + 2% Au; 5, CdC8 + 4% Au; 6, CdC8 + 4% Au + 2% CdS; vertical line marked the phase transition temperature.
Mentions: The electrical conductivity along cation-anion layers (σII; Figure 4) and across them (σ⊥; Figure 5) was measured in samples with different concentrations of nanoparticles. We used the following concentrations: semiconductor CdS were 2, 4, and 6 mol%, metal Au 2 and 4 mol%, and metal core-semiconductor shell 4 mol% Au + 2 mol% CdS. The temperature was changed in range from a room temperature up to 150°C. The results are shown in Figure 4. It is clearly seen that the conductivity is a bit larger in the samples with the larger concentration of the NPs. Also, the conductivity along the cation-anion layers is by 2 orders of magnitude higher than that across them.Figure 4

Bottom Line: The electrical conductivity anisotropy confirms the structural anisotropy of the nanocomposites.The conductivity of the nanocomposite along the cation-anion layers is higher by 2 orders of magnitude than that across the cation-anion layers.Basing on the experimental data, we proposed the simple model of the charge carriage process.

View Article: PubMed Central - PubMed

Affiliation: Institute of Physics of National Academy of Sciences of Ukraine, Nauky prosp., 46, Kyiv, 03028 Ukraine.

ABSTRACT
Dielectric properties of ionic composites consisted of cadmium octanoate matrix and semiconductor or metal nanoparticles have been investigated. The nanoparticles of different nature (semiconductor CdS, metal Au, and metal core-semiconductor shell Au-CdS) were chemically synthesized in the smectic A phase of (Cd(+2)(C7H15COO)(-2), CdC8) that was used as a nanoreactor. These nanocomposites are very stable and well ordered; the size and shape of the nanoparticles (NPs) are well controlled during the synthesis. The main aim of the research was to examine the influence of nanoparticles on the dielectric properties of ionic matrix, which has smectic A ordered structure. Electrical characteristics were investigated at different temperatures, which correspond to different phases of the material. The conductivity of nanocomposites has an activation nature. The electrical conductivity anisotropy confirms the structural anisotropy of the nanocomposites. The conductivity of the nanocomposite along the cation-anion layers is higher by 2 orders of magnitude than that across the cation-anion layers. Basing on the experimental data, we proposed the simple model of the charge carriage process.

No MeSH data available.


Related in: MedlinePlus