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Facile fabrication of chitosan–calcium carbonate nanowall arrays and their use as a sensitive non-enzymatic organophosphate pesticide sensor

2011; Royal Society of Chemistry; Volume: 3; Issue: 8 Linguagem: Inglês

10.1039/c1nr10286a

2040-3372

Jingming Gong, Wei Zhang, Ting Liu, Lizhi Zhang,

Analytical Chemistry and Sensors

Novel nanowall arrays of CaCO3–chitosan (CaCO3–chi) were deposited onto a cathodic substrate by a facile one-step electrodeposition approach. Results demonstrate that chitosan plays an important role in the formation of nanowall arrays. Freestanding well-aligned CaCO3–chi nanowall arrays were observed to be uniformly distributed over the whole substrate with a lateral dimension in the micrometre size and an average pore size of ∼400 nm. The as-formed CaCO3–chi nanowall arrays featuring interlaced porous network architecture, large surface area, and open boundaries, are highly efficient in the capture of organophosphate pesticides (OPs). Combined with stripping voltammetry, a highly sensitive non-enzymatic OPs sensor was fabricated using the prepared CaCO3–chi nanowall arrays for solid phase extraction (SPE). The detection limit for methyl parathion (MP) in aqueous solutions was determined to be 0.8 ng mL−1 (S/N = 3). The resulting sensor made of novel CaCO3–chi nanowall arrays exhibits good reproducibility and acceptable stability. This work not only provides a facile and effective route for the preparation of CaCO3–chi nanowall arrays, but also offers a new promising protocol for OPs analysis.