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Proceedings Paper

Optical properties of polyaniline-coated silica spheres: aging effect in acetone
Author(s): Byoung-Wu Kim; Sang-Jo Kim; So-Yeon Kang; Sang-Hyeon Moon; Eun-Hye Park; Kwang-Sun Kang
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Paper Abstract

Polyaniline (PAn)-coated silica spheres have been synthesized by attaching various amounts of N-[3- (trimethoxysilyl)propyl]aniline (TMSPA) and polymerizing with ammonium persulfate. The ratios of tetraethoxy orthosilicate and TMSPA were 10:1 (PAn-A), 5:1 (PAn-B), and 3:1 (PAn-C). After polymerization of the aniline moieties the –OH absorption peak drastically reduced and the new sharp peaks appeared at 1398 cm-1 and 617 cm-1 representing C-N and C-S stretching vibrations, respectively. The polymerized spheres were soaked into the acetone for three months. New absorption peak at 1712 cm-1 representing C=O stretching vibration of an ester appears after three months storage in acetone and becomes stronger with the smaller amount of PAn. Although the sphere film color is gray when it is dried, the color turned to dark when it was wetted with methanol. Complicated solvatochromic behavior was observed for whole UV-visible range depending on the solvent. The solution color changed from clear to dark brown, brown, and yellow for the PAnA, PAnB and PAnC, respectively. The absorption peaks of the dried solution for PAn-A and PAn-B at 3230, 2972, 2926, 1712, 1434/1377, and 1051 cm-1 represent C-OH, R-CH3, R2-CH2, -C=O, C-H, and Si- O-Si absorption, respectively. Photoluminescence peak of the solution shifted toward longer wavelength with the decrease the amount of PAn. The sequence of the amount of new material formation is PAn-A > PAn-B > PAn-C.

Paper Details

Date Published: 9 October 2015
PDF: 8 pages
Proc. SPIE 9545, Nanophotonic Materials XII, 95450T (9 October 2015); doi: 10.1117/12.2187587
Show Author Affiliations
Byoung-Wu Kim, Kyungil Univ. (Korea, Republic of)
Sang-Jo Kim, Kyungil Univ. (Korea, Republic of)
So-Yeon Kang, Kyungil Univ. (Korea, Republic of)
Sang-Hyeon Moon, Kyungil Univ. (Korea, Republic of)
Eun-Hye Park, Kyungil Univ. (Korea, Republic of)
Kwang-Sun Kang, Kyungil Univ. (Korea, Republic of)

Published in SPIE Proceedings Vol. 9545:
Nanophotonic Materials XII
Stefano Cabrini; Gilles Lérondel; Adam M. Schwartzberg; Taleb Mokari, Editor(s)

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