硕士研究生刘茂祥及其课题组团队,高娟娟、钱悦月、王霜、谢康俊等人为了构建针对有毒物质亚硝酸盐的简单灵敏的电化学传感器，使用一种特殊的纳米材料修饰到常规电极传感器表面。该材料一种三元多层纳米复合结构材料，其构成组分分别为PDDA、NG、Fe_1.833（OH）_0.5O_2.5。该复合材料是通过一锅水热法制备的，制备过程简单。由于材料各组分之间的协同效应，亚硝酸盐容易受到PDDA的吸引，以及容易被Fe_1.833（OH）_0.5O_2.5催化，NG具有较高的传递电荷的能力，同时PDDA有助于材料的分散及稳定，基于多种作用的协同该修饰电极传感器拥有对于极低浓度亚硝酸盐的电化学响应能力，加入0.1μmmol/L亚硝酸钠既有明显响应，线性区间分别为0.1-347 μmmol/L，347-1275μmmol/L检测下线为0.027μmmol/L。在现有报道中处于先进水平，同时材料拥有长期的稳定性以及抵抗常见物质干扰的能力。

Title: Enhanced electrocatalytic nitrite determination using poly(diallyldimethylammonium chloride)-coated Fe_1.833(OH)_0.5O_2.5-decorated N-doped graphene ternary hierarchical nanocomposite

Authors: Maoxiang Liu, Shupeng Zhang, Juanjuan Gao, Yueyue Qian , Haiou Song, Shuang Wang, Kangjun Xie, Wei Jiang, Aimin Li

Abstract:

To develop simple and sensitive electrocatalytic technique for toxic nitrite determination is significantly important. Electrochemical nitrite sensor has attracted tremendous attention owing to its high sensitivity, selectivity and short response time. Here, we report the highly sensitive nitrite sensor based on poly(diallyldimethylammonium chloride) (PDDA)-coated Fe_1.833(OH)_0.5O_2.5-decorated N-doped graphene (NG) ternary hierarchical nanocomposite (Fe_1.833(OH)_0.5O_2.5/NG@PDDA). Differing from complicated synthetic routes for the reported ternary systems, the Fe_1.833(OH)_0.5O_2.5/NG@PDDA composite can be effectively constructed by a facile one-pot hydrothermal method. The electrochemical performance of Fe_1.833(OH)_0.5O_2.5/NG@PDDA composite film modified glassy carbon electrode was investigated by cyclic voltammetry and amperometric techniques. The experimental results indicate that synergistic effect of Fe_1.833(OH)_0.5O_2.5 as catalytic center, NG as conductive platform and PDDA as nitrite adsorbent can significantly enhance the electrochemical response. The fabricated sensor exhibits the excellent analytical performance for nitrite detection linearly over two different concentration ranges, which are from 0.1 to 347 μM and from 347 to 1275 μM with a detection limit of 0.027 μM (S/N=3). The value is very much comparable to the recent literature ones. Moreover, the proposed electrochemical sensor also shows good stability, reproductivity and excellent anti-interference ability against metal ions and electroactive species, and exhibits satisfactory recovery for detecting nitrite in drinking water. 

全文链接：http://www.sciencedirect.com/science/article/pii/S0925400516319220 

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