TiO2 나노 입자를 첨가한 광고분자 필름의 회절효율 값에 대한 연구
Study of Diffraction Efficiency Values for Photopolymer Films Added TiO2 Nanoparticles
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초록
본 연구에서는 광고분자의 광특성을 향상시키기 위하여, TiO2를 첨가시킨 광고분자를 제조하고, 그 광학 특성을 연구하였다. 광고 분자는 PVA를 바인더로, AA를 모노머로, TEOA를 개시제로, Eosin Y를 광감각제로 사용하여 제조하였다. 균일한 두께의 광고분자 필름을 얻기 위하여, 스핀 쿼터를 이용하여 일정양의 광고분자 용액을 슬라이드 글라스에 펼쳐 제조하였다. 건조 조건은 25℃, 습도 60%, 72시간을 유지하였고, 이렇게 제작된 광고분자 필름을 20~70도 범위의 다양한 입사각에서 회절효율을 측정하였다. 그 결과, TiO2가 첨가된 광고분자 필름은 무첨가 필름보다 5% 정도 높은 회절효율 값을 나타내었다. 뿐만 아니라, TiO2의 첨가는 넓은 입사각 범위에서도 높은 효율을 나타내는데 효과적이었다.
Abstract
In order to improve the diffraction efficiency of the photopolymer, we prepared a TiO2 added photopolymer and investigated the optical properties. Prepared photopolymer films are based on polyvinyl alcohol (PVA) as a polymer binder, acryl amide (AA) as a photo-polymerizable monomer, triethanolamine (TEOA) as an initiator, and eosin Y as a sensitizer at 532 nm. To prepare the photopolymer films with the uniform thickness, the constant amount (2.5 ml) of the photopolymer solution was dropped on the glass and spread using a spin coater. Then films were dried for 72 hrs in a darkroom (20℃, 40% RH) prior to the optical measurement. Then, the diffraction efficiencies of both the photopolymer films containing TiO2 and non-contained films were measured with the various incident angles (20~70°). Therefore, TiO2 added photopolymer showed 5% higher diffraction efficiency than neat photopolymer without TiO2 addition. The addition of TiO2 into the photopolymer showed the high diffraction efficiency (over 70%) at broad range (20~70°) of the incident angle.
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