Pamukkale Univ Muh Bilim Derg. Ahead of Print: PAJES-85359 | DOI: 10.5505/pajes.2024.85359

Synthesis, Dielectric and Thermal Performance of PVA Nanocomposites with Cadmium-Based Quantum Dots

Tuna Demirci¹, Erdem Elibol², Þeref KARADENÝZ^1
1Düzce University Scientific and Technological Research Application and Research Center, Düzce, Türkiye
²Düzce Üniversitesi Mühendislik Fakültesi Elektrik-Elektronik Mühendisliði Bölümü, Düzce, Türkiye

Hybrid polymer structures formed with semiconductor quantum dots that are doped into the polymer matrix and whose optical properties can be adjusted have attracted attention with their high usage potential in electronic applications in recent years. In this study, three types of Cd-based QD (CdX (X = Se, Te, SeTe)) were used to strengthen the poly (vinyl alcohol) (PVA) matrix and increase its optical properties. Optical, conductivity and thermal characterizations of PVA / 3 different Cd-based QDs CdSe QD-PVA nanocomposites structures were evaluated comparatively. With the addition of QDs, it was observed that the PVA / QD CdSe QD-PVA nanocomposites structure exhibits fluorescence properties. Hybridization structures in PVA/QDs CdSe QD-PVA nanocomposites structures were illuminated by FT-IR spectrum. In addition, it was determined that the thermal stability of hybrid polymer structures increased between 7-9% and the melting point of PVA/QD hybrid polymers increased by 5-7°C which was analyzed by DSC. The highest thermal stability and melting point increases were observed in PVA / CdSeTe QDs hybrid structures. With the addition of CdSe QDs and CdTe QDs into the PVA matrix, the conductivity value of the hybrid polymer structure increased 100 times, while the addition of CdSeTe QDs increased the conductivity by 1000 times. Similarly, in dielectric constant and dielectric loss tests, it was determined that PVA / CdSeTe QD hybrid polymer structures are more successful than both types due to the synergic effect.

Keywords: Nanotechnology, PVA nanocomposites, Quantum Dots, Optical properties, Thermal properties, Dielectric permittivity

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Kadmiyum içerikli Kuantum Nokta ile PVA Nanokompozitlerin Sentezi, Dielektrik ve Termal Performansý

Tuna Demirci¹, Erdem Elibol², Þeref KARADENÝZ^1
1Düzce Üniversitesi Bilimsel ve Teknolojik Araþtýrmalar Uygulama ve Araþtýrma Merkezi, Düzce, Türkiye
²Düzce University, Faculty of Engineering, Department of Electrical-Electronics Engineering, Düzce, Türkiye

Polimer matrisine katkýlý yarý iletken kuantum noktalarý ile oluþturulan ve optik özellikleri ayarlanabilen hibrit polimer yapýlarý, son yýllarda elektronik uygulamalarda yüksek kullaným potansiyelleri ile dikkat çekmektedir. Bu çalýþmada, poli(vinilalkol) (PVA) matrisini güçlendirmek ve optik özelliklerini arttýrmak için üç tip Cd bazlý kuantum nokta (QDs) (CdX (X = Se, Te, SeTe)) kullanýlmýþtýr. PVA / 3 farklý Cd tabanlý QDs yapýlarýnýn optik, iletkenlik ve termal karakterizasyonlarý karþýlaþtýrmalý olarak deðerlendirildi. QDs'lerin eklenmesiyle birlikte PVA/QDs nanokompozit yapýsýnýn floresans özellikleri sergilediði gözlemlendi. PVA/QDs nanokompozit yapýlarýndaki hibridizasyon yapýlarý FT-IR spektrumu ile aydýnlatýlmýþtýr. Ayrýca DSC ile analiz edilen hibrit polimer yapýlarýn termal stabilitesinin %7-9 arasýnda arttýðý ve PVA/QDs hibrit polimerlerin erime noktasýnýn 5 ile 7°C arttýðý tespit edilmiþtir. En yüksek termal kararlýlýk ve erime noktasý artýþlarý PVA / CdSeTe QDs hibrit yapýlarýnda gözlendi. PVA matrisine CdSe QDs'ler ve CdTe QDs'lerin eklenmesiyle hibrit polimer yapýsýnýn iletkenlik deðeri 100 kat artarken, CdSeTe QDs'lerin eklenmesi iletkenliði 1000 kat artýrmýþtýr. Benzer þekilde dielektrik sabiti ve dielektrik kayýp testlerinde de PVA/CdSeTe QDs hibrit polimer yapýlarýnýn sinerjik etki nedeniyle her iki tipe göre daha baþarýlý olduðu tespit edilmiþtir.

Anahtar Kelimeler: Nanoteknoloji, PVA nanokompozitleri, Kuantum Noktalarý, Optik özellikler, Termal özellikler, Dielektrik geçirgenlik.

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