Tb3+ ile Aktive Edilmiş TiO2 Fotolüminesans Nanomalzemelerin Sentezi ve Karakterizasyonu

Diğer fotokatalitik yarı iletkenlere kıyasla, titanyum dioksitin şimdiye dek hem temel araştırmalarda hem de pratik uygulamalarda kullanılan en umut verici malzeme olduğu gösterilmiştir, çünkü daha yüksek bir foto reaktivite sergiler ve ucuz, toksik olmayan, kimyasal ve biyolojik olarak etkisiz ve kararlıdır. Nadir toprak iyonları (RE3+), yüksek yoğunlukları ve yüksek ışık verimleri nedeniyle dopant elementler olarak tercih edilir. Tb3+ katkılı TiO2nanopartikülleri, geniş emme bandı, yüksek emisyon yoğunluğu, uzun ömür, stabilite gibi birçok avantaj sunar. Ti02:%1 Tb3+ nanopartiküller sol-jel yöntemi ile 550oC’ de üretildi. Sentezlenen nanomalzemelerin partikül boyut analizi, XRD, DTA-TG, FTIR, SEM ve PL (photo luminescence) analizleri yapılmıştır. Anataz kristal yapısında, nanopartiküllerin boyutları 100 nm'nin altında ölçülmüş ve partiküllerin yer yer kümelendiği mikroyapıda gözlenmiştir. Nanopartiküller 275 nm'de uyarıldığında, 544 nm ve 585 nm'de Tb3+ iyonlarının yeşil emisyon bantları gözlenmiştir. Bu dalga uzunluğu, sırasıyla 5D4→ 7F5 and 5D4 → 7F4 elektronik geçişlerine bağlanmaktadır.

Anahtar Kelimeler:

TiO2, Foto Lüminesans, Sol-gel, Nadir Toprak Elementler

Synthesis and Characterization of Tb3+-Activated TiO2 Photoluminescence Nanomaterials

As compared to other semiconductor photocatalysts, titanium dioxide has so far been shown to be the most promising material used for both fundamental research and practical applications, because it exhibits a higher photoreactivity and it is cheap, nontoxic, chemically and biologically inert, and photostable. Rare earth ions (RE3+) are preferred as dopant elements due to their high densities and high light yields. Tb3+ doped TiO2nanoparticles offer several advantages such as broad absorption band, high emission intensity, long lifetime, stability. TiO2: 1%Tb3+ nanoparticles, were produced at 550 degrees by the sol-gel method. Particle size analysis, XRD, DTA-TG, FTIR, SEM, and PL analyzes of the synthesized nanomaterials were performed. In the anatase crystal structure, the dimensions of the nanoparticles were measured below 100 nm and were observed in the microstructure where the particles were clustered in places. When the nanoparticles were excited at 275 nm, green emission bands of Tb3+ ions at 544 nm and 585 nm were observed. This wavelength is attributed to electronic transitions 5D4→ 7F5 and 5D4 → 7F4, respectively.

Keywords:

TiO2, Photoluminescence, Sol-gel, Rare Earth Element,

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