CdSe kuantum nokta katkılı polimer nanokompozitlerin radyolüminesans ve optik karakterizasyonu

Yıl 2018, Cilt: 20 Sayı: 1, 132 - 144, 17.07.2018

İlker Çetin Keskin Murat Türemiş Mehmet İsmail Katı Yasemin Tuncer Arslanlar Rana Kibar Ahmet Çetin

https://doi.org/10.25092/baunfbed.357310

Öz

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.

Anahtar Kelimeler

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

Öz

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.

Anahtar Kelimeler

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

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