离子注入改性聚对苯乙炔的光学及电学性能

STUDY ON OPTICAL AND ELECTRONICAL PROPERTIES OF POLY(1,4-PHENYLENE VINYLENE) FILMS BY ION IMPLANTATION

利用脱氯化氢反应制备π共轭高分子聚[2-甲氧基-5-(3′-甲基)丁氧基]对苯乙炔(MM B-PPV)。采用能量为15 keV^35 keV,剂量为3.8×1015ions/cm2~9.6×1016ions/cm2的低能氮离子(N+)对MM B-PPV薄膜进行离子注入改性研究。红外光谱显示,离子注入后分子的特征峰未发生显著变化,而在3442cm-1、1622 cm-1等处出现N-H键的振动峰;随着注入能量、剂量的增加,薄膜的紫外-可见吸收边向长波方向移动,π共轭高分子中激发态和基态间的光学禁带宽度变窄;薄膜的表面电导率随着注入能量、剂量的增加迅速提高,当注入能量为35 keV,剂量为9.6×1016ions/cm2时,表面电导率高达3.2×1-0 2S/cm,比本征态提高7个数量级以上。

Poly [- 2-methoxy-5- （3＇-methyl） butoxy I-p- phenylene vinylene （MMB-PPV） was synthesized by dehydrochlorination reaction and the optical and electrical properties of the MMB- PPV films implanted by N＋ ions have been also studied. The energy and doses of the N＋ ions ranges from 15 keV to 35 keV and from 3.8 × 10^15 ions/cm^2 to 9. 6×10^16 ions/cmz respectively. FT-IR spectra reveal that the implanted ions make some N-H bonds formation. UV-Vis Spectroscopy shows a shift of the absorption edges to longer wavelengths and the optical band gap decreases with the increase of the energy and doses of implanted ions. The sheet conductivity of the films enhances sharply with the increase of the energy and doses of N^＋ ions. The sheet conductivity of the film is 3.2×10^-2 S/cm when ion implantation was performed with an energy of 35 keV, at a dose of 9. 6 × 10^16 ions/cm^2, which is 7 order of magnitude higher than that of the film unimplanted.