Journal
BIOSENSORS & BIOELECTRONICS
Volume 43, Issue -, Pages 180-185Publisher
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2012.10.099
Keywords
Silver nanocubes; {100} facets; Hydrogen peroxide; Hydrazine; Electrochemical sensor
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Funding
- President Funds of the Chinese Academy of Sciences
- Natural Science Foundation of Jilin Province [201215092]
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We report a novel hydrogen peroxide (H2O2) and hydrazine sensor based on low-cost poly(vinylpyrrolidone)-protected silver nanocubes (PVP-AgNCs). The monodisperse silver nanocubes were prepared by adding a trace amount of sodium sulfide in the conventional polyol synthesis for fast reduction of silver nitrate under protection of argon. The sensor was fabricated by simple casting of PVP-AgNCs aqueous solution on a glassy carbon electrode and the performance was evaluated by cyclic voltammetry and amperometric techniques. It was found that the resulting sensor exhibited extremely good performance toward H2O2 detection with wide linear response ranging from 0.05 to 70 mM (R=0.996) at -0.3 V and low detection limit of 0.18 mu M estimated at a signal-to-noise ratio of 3. In addition, the fabricated sensor also exhibited high sensitivity toward the detection of hydrazine with a low detection limit of 1.1 mu M, wide linear range from 0.005 to 0.46 mM (R=0.999) at 0.4 V and rapid amperometric response time of less than 2 s. For both analytes, the sensor exhibited good reproducibility, selectivity and stability. The excellent performance of the sensor might be attributed to the enhanced electrochemical sensing property of well-defined PVP-AgNCs with rich {100} facets. (c) 2012 Elsevier B.V. All rights reserved.
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