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Seminar INFLPR, Joi, 14 Iunie 2018, ora 12:00, Laboratorul FPFN, Daniel Avram: „Sinteza şi caracterizarea nanoparticulelor cu luminescenţă persistentă”

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Seminar INFLPR

Joi, 14 Iunie 2018, ora 12:00

Laboratorul FPFN, sala de seminar a IFTM

Contractul nr.: 3N/2018

Proiectul: PN 18 13 01 02 / Micro şi nanostructuri din materiale avansate obţinute prin tehnologii cu laser, plasmă şi fascicul de electroni

Faza nr. 3: „Sinteza şi caracterizarea nanoparticulelor cu luminescenţă persistentă”

Termen: 15.05.2018

Responsabil fază: Dr. Carmen Tiseanu

Prezintă: Daniel Avram

Rezumat: Datorită proprietăţilor de stocare eficientă a energiei de excitare în capcane şi a timpului lung de emisie, nanoparticulele cu luminescenţă persistentă reprezintă probe ideale pentru bioimagistică. Acestea au caracteristica unică de a nu necesita activare in situ care conduce la fenomenul de autofluorescenţă responsabil de scăderea raportului semnal-zgomot şi a contrastului. Raportul de faţă descrie studiile noastre privind luminescenţa persistentă în infraroşu apropriat a nanoparticulelor dopate cu lantanide şi metale tranziţionale pentru aplicaţii biologice.

Am sintetizat nanoparticule (Zn3Ga2GeO8) dopate cu ioni de tranziţie (Cr)/lantanide (Er şi Yb) prin metoda sol-gel: Zn3Ga2GeO8: 1Cr; Zn3Ga2GeO8: 1Cr, 1Er; şi Zn3Ga2GeO8: 1Cr, (1/0.5)Er, 5Yb cu dimensiuni mici ale cristalitelor (20 – 30 nm). Nanoparticulele au fost caracterizate din punct de vedere structural prin difracţie şi fluorescenţă de raze X. Nanoparticulele prezintă luminescenţă persistentă în regiunea spectrală 700 – 800 nm prin excitare cu raze X şi UV. Emisia poate fi observată până la 4 h pentru proba cea mai intensă (Zn3Ga2GeO8: 1Cr). Am analizat, de asemenea, emisia în conversie superioară a nanoparticulelor co-dopate cu Er şi Er-Yb folosind excitare pulsată în jur de 970 şi 1500 nm.

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