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Synthesis and Characterization of a Water-Soluble Ionic Polyacetylene Derivative

100%

Gal Y., Jin S., Park J., Lim K.

Acta Physica Polonica A

2016

vol. 129

issue 4

642-646

A new water-soluble ionic polyacetylene was synthesized by the acid-catalyzed polymerization of 2-ethynylpyridine using acrylic acid. The polymerization proceeded well to give a high yield of polymer. The acetylenic C ≡ C bond stretching (2110 cm¯¹) and acetylenic ≡ C-H bond stretching (3293 cm¯¹) peaks of 2-ethynylpyridine monomer were not seen in the FT-IR spectrum of polymer. The electro-optical and electrical properties of the ionic polyacetylene were measured and discussed. The resulting polymer showed strong maximum at 513 nm in the UV-Visible absorption, which is corresponding to photon energy of 2.42 eV. The energy gap width of polymer was estimated to be of 2.08 eV. It was observed that the electrochemical process of polymer is reproducible in the potential range of -1.80 to 1.60 V vs Ag/AgNO₃. HOMO and LUMO levels of polymer were 4.85 eV and 2.77 eV, respectively.

Fabrication and Characterization of GaN/Polymer Composite p-n Junction with PEDOT Nanoparticle Interface Layer

52%

Kim M., Jin S., Choi H., Kim G., Yim K., Kim S., Nam G., Yoon H., Kim Y., Lee D., Kim J., Kim J., Leem J.

Acta Physica Polonica A

2011

vol. 119

issue 6

875-879

A heavily Si-doped GaN/polymer hybrid structure with p-type poly(3,4-ethylene-dioxythiophene):beta-1,3-glucan (PEDOT nanoparticle) interface layer has been fabricated. The Si-doped GaN thin film with carrier concentration of 1 × 10^{19} cm^{-3} was grown by metal-organic chemical vapor deposition. The PEDOT nanoparticle with various sizes ranging from 60 to 120 nm was synthesized via a miniemulsion polymerization process. The electrical conductivity of the PEDOT nanoparticle is less than 1.2 S/cm. The current-voltage (I-V) characteristic of the hybrid structure shows diode-like behavior. The I-V characteristic was examined in the framework of the thermionic emission model. The ideality factor of the structure without PEDOT nanoparticle interface layer is 12.9. However, the ideality factor of the hybrid structure with PEDOT nanoparticle interface layer is obtained as 1.9. The value of ideality factor is dramatically decreased by inserting the PEDOT nanoparticle interface layer.

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2 Acta Physica Polonica A

1 2016

1 2011

2 Jin S.

1 Choi H.

1 Gal Y.

1 Kim G.

1 Kim J.

1 Kim M.

1 Kim S.

1 Kim Y.

1 Lee D.

1 Leem J.

1 Lim K.

1 Nam G.

1 Park J.

1 Yim K.

1 Yoon H.

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Synthesis and Characterization of a Water-Soluble Ionic Polyacetylene Derivative

Fabrication and Characterization of GaN/Polymer Composite p-n Junction with PEDOT Nanoparticle Interface Layer