CdSe kuantum nokta katkılı polimer nanokompozitlerin radyolüminesans ve optik karakterizasyonu

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

Kaynakça

1. Mansur, H.S., Quantum dots and nanocomposites. Wiley Interdisciplinary Reviews: Nanomedicine and Nanobiotechnology, 2(2), 113–129, (2010).
2. Mansur, H.S., Vasconcelos, W.L., Grieser, F. and Caruso, F., Photoelectrochemical behaviour of CdS “Q-state” semiconductor particles in 10,12-nonacosadiynoic acid polymer langmuir-blodgett films, Journal of Materials Science, 34, 21, 5285–5291, (1999).
3. Carrillo-Carrión, C., Cárdenas, S., Simonet, B.M. and Valcárcel, M., Quantum dots luminescence enhancement due to illumination with UV/Vis light, Chemical Communications (Cambridge, England), 35, 5214–26, (2009).
4. Dai, G., Gou, G., Wu, Z., Chen, Y., Li, H., Wan, Q. and Zou, B., Fabrication and micro-photoluminescence property of CdSe/CdS core/shell nanowires, Applied Physics A, 119, 1, 343–349, (2015).
5. Lei, Y., Fang, C., Xu, J. and He, Y., Enhanced photoelectric properties of CdSe/graphene composites with various contents of graphene, Ceramics International, 42, 4, 5326–5330, (2016).
6. Hussain, F., Hojjati, M., Okamoto, M. and Gorga, R. E., Polymer-matrix nanocomposites, processing, manufacturing, and application: an overview, Journal of Composite Materials, 40, 17, (2006).
7. Keskin, İ.Ç., Türemiş, M., Katı, M.İ., Kibar, R., Şirin, K., Çipiloğlu, M.A. and Çetin, A., The radioluminescence and optical behaviour of nanocomposites with CdSeS quantum dot, Journal of Luminescence, 185, 48–54. (2017).
8. Kati, M.I., Türemis, M., Keskin, I.C., Tastekin, B., Kibar, R., Çetin, A. and Can, N., Luminescence behaviour of beryl (aquamarine variety) from Turkey, Journal of Luminescence, 132, 10, (2012).

9. Tuncer Arslanlar, Y., Kibar, R., Çetin, A. Canımoğlu, A., Radioluminescence properties of copper- and terbium-implanted strontium titanate radioluminescence properties of copper- and terbium-implanted strontium titanate. Letters, Spectroscopy, (July), 364–366, (2013).
10. Wang, Q., Pan, D., Jiang, S., Ji, X., An, L. and Jiang, B., A new two-phase route to high-quality CdS nanocrystals, Chemistry - A European Journal, 11, 13, 3843–3848, (2005).
11. Wang, Q., Pan, D., Jiang, S., Ji, X., An, L. and Jiang, B., Luminescent CdSe and CdSe/CdS core-shell nanocrystals synthesized via a combination of solvothermal and two-phase thermal routes, Journal of Luminescence, 118, 1, 91–98, (2006).
12. Li, M., Zhang, H., Zhang, J., Wang, C., Han, K. and Yang, B., Easy preparation and characterization of highly fluorescent polymer composite microspheres from aqueous CdTe nanocrystals, Journal of Colloid and Interface Science, 300, 2, 564–568, (2006).
13. Kaur, J. and Tripathi, S.K., Thermally and optical-induced effect on optical and electrical parameters of Ag-doped CdSe thin films, Acta Metallurgica Sinica (English Letters), 28(5), 591–599, (2015).
14. Townsend, P.D. and Kelly, J.C., Colour Centres and Imperfections in Insulators and Semiconductors, Chatto and Windus for Sussex University Press, London, (1973).
15. Yu, W.W., Qu, L., Guo, W. and Peng, X., Experimental determination of the extinction coefficient of CdTe , CdSe , and CdS nanocrystals experimental determination of the extinction coefficient of CdTe , CdSe , and CdS nanocrystals, Chemistry of Materials, 15, 14, 2854–2860, (2003).
16. Mohan, S. and Oluwafemi, O. S., Simple synthesis of orange fluorescent CdSe-polycaprolactone nanofiber via a completely non-phosphine based route, Materials Letters, 174, 157–161, (2016).
17. Liu, B., Lü, X., Wang, C., Tong, C., He, Y. and Lü, C., White light emission transparent polymer nanocomposites with novel poly(p-phenylene vinylene) derivatives and surface functionalized CdSe/ZnS NCs. Dyes and Pigments, 99, 1, 192–200, (2013).
18. Ma, Y., Zhang, B., Gu, M., Huang, S., Liu, X., Liu, B. and Ni, C., Bulk synthesis of homogeneous and transparent bulk core / multishell quantum dots/ PMMA nanocomposites with bright luminescence, Advanced Materials, 1548–1553, (2013).
19. Li, Z., Wan, S., Xu, W., Wang, Y., Shah, B. R., Jin, W. and Li, B., Highly luminescent film functionalized with CdTe quantum dots by layer-by-layer assembly, Journal of Applied Polymer Science, 41893, 4–9, (2015).
20. Şirin, K., Doğan, F., Balcan, M. and Kaya, İ., Effect of CaCO3 filler component on solid state decomposition kinetic of PP/LDPE/CaCO3 composites. Journal of Macromolecular Science, Part A:Pure and Applied Chemistry, 46, 949–958, (2009).
21. Suthan, T., Rajesh, N. P., Mahadevan, C. K., Sajan, D. and Bhagavannarayana, G., Growth and characterization of organic material 2-hydroxypyridine single crystal by modified vertical Bridgman technique, Materials Chemistry and Physics, 130, 3, 915–920, (2011).