Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 227, Issue -, Pages 92-99Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2015.12.032
Keywords
Graphene; Cobalt oxide; Nanocomposite; Nitrite; Non-enzymatic
Funding
- National Research Foundation of Korea (NRF) - Korean Ministry of Science, ICT & Future Planning [2010-C1AAA001-0029018]
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT & Future Planning [2014R1A5A1009799]
- National Research Foundation of Korea [2014R1A5A1009799, 2012M1A2A2671808] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Cobalt oxide (Co3O4) nanospindles-decorated reduced graphene oxide (RGO) composite is prepared via thermal decomposition of a three-dimensional coordination complex precursor, cobalt benzoate dihy-drazinate, at 200 degrees C. Transmission electron microscopy reveals that Co3O4 nanospindles with an average particle size of <25 nm are decorated on the RGO surface. The low decomposition temperature and lack of residual impurities are significant aspects of this simple and facile method. The electrochemical performance of the proposed sensor is investigated using cyclic voltammetry and chronoamperometry. Under optimum conditions, anodic peak currents are linearly proportional to their concentrations, in the range of 1-380 mu M for nitrite with a regression equation of I (A) = 2.0660 C + 6.7869 (R-2 = 0.9992). The sensor exhibits a high sensitivity of 29.5 mu A mu M-1 cm(-2), a rapid response time of 5 s, and a low detection of limit of 0.14 mu M. The proposed electrode shows good reproducibility and long-term stability. The sensor is used to determine the nitrite level in tap water with acceptable recovery, implying its feasibility for practical application. (C) 2015 Elsevier B.V. All rights reserved.
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