کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7117509 | 1461362 | 2018 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Vertical CuO nanowires array electrodes: Visible light sensitive photoelectrochemical biosensor of ethanol detection
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
سایر رشته های مهندسی
مهندسی برق و الکترونیک
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Photoelectrochemical (PEC) sensing using visible light has attracted great attention for high sensitivity with low undesired background noise. A CuO electrode with nanowires on Cu foil was synthesized by thermal oxidation and the devices was used to explore the PEC sensing for ethanol detection under visible light. The morphology, composition, optical, and PEC properties of CuO nanowires have been systematically investigated. The results showed that the CuO nanowires were present on the top surface of specimens with single phase and the thick interface layer were made of Cu2O between CuO nanowires and Cu foil substrate. The CuO nanowires on surface contained two types of nanowire (bend CuO Nws and vertical CuO Nws). With the temperature increasing, the Nws of first type decreased, and the Nws of second type started to increase. When the Cu foil were annealed at 700â¯Â°C, densely bundled CuO Nws array was vertically fabricated on the foil. The band gaps of CuO nanowires annealing at 400â¯Â°C, 500â¯Â°C, 600â¯Â°C, and 700â¯Â°C, were 1.715, 1.714, 1.698, 1.691â¯eV, indicating that CuO nanowires annealing at 700â¯Â°C can obtain the highest photoreponse. The photocurrent of the vertical CuO nanowires array annealing at 700â¯Â°C were calculated with 668 μA cmâ2 about 2-fold, 6-fold and 10-fold higher than that to CuO nanowires annealing at 600â¯Â°C, 500â¯Â°C and 400â¯Â°C, respectively. Combing with the morphology of CuO nanowires annealing at different temperature, the vertivally-aligned nanowires array at 700°Cwas attractive than others. This vertical CuO nanowires device prepared at 700â¯Â°C is visible-light irradiation and shows the fast photoresponse, present a detection limit of 23.2â¯nM, which is much lower than those with the similar configurations reported previously. It is probable that the vertical CuO nanowires array may be applied as the proposed PEC sensor to determine ethanol in further.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science in Semiconductor Processing - Volume 85, October 2018, Pages 90-97
Journal: Materials Science in Semiconductor Processing - Volume 85, October 2018, Pages 90-97
نویسندگان
Weiting Zhan, Zhe Chen, Ji Hu, Xiongjie Chen,