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Sensors 2015, 15(9), 22473-22489; doi:10.3390/s150922473

Effects of Nanowire Length and Surface Roughness on the Electrochemical Sensor Properties of Nafion-Free, Vertically Aligned Pt Nanowire Array Electrodes

Department of Chemical Engineering, University of Massachusetts Lowell, One University Ave, Lowell, MA 01854, USA
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Author to whom correspondence should be addressed.
Academic Editor: Kagan Kerman
Received: 13 July 2015 / Revised: 15 August 2015 / Accepted: 31 August 2015 / Published: 4 September 2015
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Abstract

In this paper, vertically aligned Pt nanowire arrays (PtNWA) with different lengths and surface roughnesses were fabricated and their electrochemical performance toward hydrogen peroxide (H2O2) detection was studied. The nanowire arrays were synthesized by electroplating Pt in nanopores of anodic aluminum oxide (AAO) template. Different parameters, such as current density and deposition time, were precisely controlled to synthesize nanowires with different surface roughnesses and various lengths from 3 μm to 12 μm. The PtNWA electrodes showed better performance than the conventional electrodes modified by Pt nanowires randomly dispersed on the electrode surface. The results indicate that both the length and surface roughness can affect the sensing performance of vertically aligned Pt nanowire array electrodes. Generally, longer nanowires with rougher surfaces showed better electrochemical sensing performance. The 12 μm rough surface PtNWA presented the largest sensitivity (654 μA·mM1·cm2) among all the nanowires studied, and showed a limit of detection of 2.4 μM. The 12 μm rough surface PtNWA electrode also showed good anti-interference property from chemicals that are typically present in the biological samples such as ascorbic, uric acid, citric acid, and glucose. The sensing performance in real samples (river water) was tested and good recovery was observed. These Nafion-free, vertically aligned Pt nanowires with surface roughness control show great promise as versatile electrochemical sensors and biosensors. View Full-Text
Keywords: Pt nanowire array; electrochemical biosensor; nanowire length; surface roughness; Nafion free; hydrogen peroxide Pt nanowire array; electrochemical biosensor; nanowire length; surface roughness; Nafion free; hydrogen peroxide
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Li, Z.; Leung, C.; Gao, F.; Gu, Z. Effects of Nanowire Length and Surface Roughness on the Electrochemical Sensor Properties of Nafion-Free, Vertically Aligned Pt Nanowire Array Electrodes. Sensors 2015, 15, 22473-22489.

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