کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
27322 44016 2011 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Expanding the photoresponse range of TiO2 nanotube arrays by CdS/CdSe/ZnS quantum dots co-modification
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی بیو مهندسی (مهندسی زیستی)
پیش نمایش صفحه اول مقاله
Expanding the photoresponse range of TiO2 nanotube arrays by CdS/CdSe/ZnS quantum dots co-modification
چکیده انگلیسی

Highly ordered TiO2 nanotube arrays modified by CdS, CdSe and ZnS quantum dots (QDs) were fabricated by using chemical bath deposition. The CdS and CdSe QDs modification expands the photoresponse range of TiO2 nanotube arrays from ultraviolet region to visible range. It is demonstrated that sequentially assembled CdS and CdSe QDs significantly improved the light harvesting ability and photocurrent efficiency, and a high incident photon to current conversion efficiency (IPCE) of 53% was obtained. Further coating the TiO2/CdS/CdSe nanotube array with a barrier layer of ZnS QD increases the IPCE to 72%. The improved photo harvest efficiency of the CdS/CdSe/ZnS co-modified TiO2 arrays is attributed to the formation of an ideal cascade-type energy band structure, which is advantageous for both electron injection and hole recovery.


► Highly ordered TiO2 nanotube arrays modified by CdS, CdSe and ZnS QDs were prepared.
► The TiO2/CdS/CdSe/ZnS photoanode exhibits an expanded photoresponse range and high IPCE.
► The improved light harvesting ability is attributed to the cascade-type energy band structure.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 224, Issue 1, 15 November 2011, Pages 25–30
نویسندگان
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