Quá trình nhạy cảm hóa ánh sáng của dẫn xuất imidazole bởi hạt nano ZnO

Journal of Fluorescence - Tập 22 - Trang 1047-1053 - 2012
Chockalingam Karunakaran1, Jayaraman Jayabharathi1, Kumar Brindha Devi1, Karunamoorthy Jayamoorthy1
1Department of Chemistry, Annamalai University, Annamalainagar, India

Tóm tắt

Một cảm biến huỳnh quang nhạy cảm dựa trên imidazole như 4, 5-diphenyl-2(E)-styryl-1H-imidazole, dành cho ZnO đã được thiết kế và tổng hợp qua các bước đơn giản. Các nghiên cứu về hấp thụ, huỳnh quang, SEM, EDX và IR cho thấy dẫn xuất imidazole gắn kết trên bề mặt của chất bán dẫn ZnO. Dựa trên cơ chế chuyển electron do ánh sáng kích thích (PET), sự gia tăng huỳnh quang đã được giải thích và hằng số liên kết rõ ràng đã được tính toán. Sự hấp thụ ligand trên hạt nano ZnO làm giảm mức năng lượng HOMO và LUMO của dẫn xuất imidazole, và sự liên kết hóa học giữa nguyên tử nitơ của imidazole và ion kẽm trên bề mặt nano oxide có thể là lý do cho việc hấp thụ mạnh của ligand trên hạt nano. Sự chích điện từ dẫn xuất imidazole bị kích thích ánh sáng vào băng dẫn điện của ZnO (S*→S+ + e_CBV−) giải thích cho sự gia tăng huỳnh quang.

Từ khóa

#imidiazole #ZnO #cảm biến huỳnh quang #chuyển electron #hấp thụ

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