CdSe kuantum nokta katkılı polimer nanokompozitlerin radyolüminesans ve optik karakterizasyonu

Abstract

Bu çalışmada, yüksek parıldar madde olan CdSe kuantum noktalar, yüzey aktif madde olarak oleik asit (OA) kullanılarak çift fazlı yöntemle sentezlenmiştir., CdSe kuantum noktalarının alçak yoğunluklu polietilen (AYPE) ile farklı oranlarda karıştırılmasıyla yeni nanokompozititler elde edildi. Bu nanokompozitlerin yapısal (FT-IR), morfolojik (TEM, SEM), termal (TG-DTA) ve soğurma (UV-VIS) özelliklerinin yanı sıra radyolüminesans (RL) özellikleri araştırıldı. Oleik asit kaplı CdSe nanokristali için 335 nm, 510 nm ve 655 nm'de radyolüminesans pikleri gözlendi. Nanokompozitlerin toz haldeki CdSe kuantum nokta ile katkılandırılması sonucu, soğurma bantlarında önemli derecede mavi bölgeye kayma gözlemlendi. CdSe için optik bant aralığı 1.82 eV olarak hesaplandı. CdSe QD ile katkılandırılmış nanokompozitler için bu değer 3,23 eV'ye yükselmiştir.

Keywords

• Kuantum nokta,Radyolüminesans (RL),Alçak Yoğunluklu Polietilen (AYPE),optik soğurma,yapısal karakterizasyon,termal analiz

Radioluminescence and optic characterization of CdSe quantum dot added polymer nanocomposites

Abstract

In this study, CdSe quantum dots which is highly luminescent were synthesized by two phase method using oleic acid (OA) as a surfactant. New nanocomposites have been obtained by mixing CdSe quantum dots with low-density polyethylene (LDPE) in different ratios. The structural (FT-IR), morphological (TEM, SEM), thermal (TG-DTA) and absorption (UV-VIS) properties of these nanocomposites were investigated as well as their radioluminescence (RL) properties. Radioluminescence peaks at 335 nm, 510 nm and 655 nm for the oleic acid-capped CdSe nanocrystal were observed. As a consequence of the nanocomposites being doped with powder CdSe quantum dot, a significant blue shift was observed in the absorption bands. The optical band gap for CdSe was calculated as 1.82 eV. The nanocomposites blended with CdSe QD, this value increased to 3.23 eV.

Keywords

• Quantum dots,Radioluminescence (RL),Low Density Polyethylene (LDPE),optical absorption,structural characterization,thermal analysis

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