Chitosan-stabilized silver nanoparticles for voltammetric detection of nitrocompounds

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• 作者：Camila A. de LimaAuthor Vitae ; Paulo S. da SilvaAuthor Vitae ; Almir Spinelli<sup> ; sup><sup>almir.spinelli@ufsc.br" class="auth_mailsup>Author Vitae
• 关键词：Silver nanoparticles ; Chitosan ; Electrochemical sensor ; Nitrocompounds
• 刊名：Sensors and Actuators B: Chemical
• 出版年：June, 2014
• 年：2014
• 卷：196
• 期：Complete
• 页码：39-45
• 全文大小：1221 K

文摘

A material comprised of chitosan-stabilized silver nanoparticles (nAg-chitosan) was prepared and characterized by UV-vis and TEM. The average diameter of the nAg obtained was 3.4 nm and the particles were well dispersed in the chitosan matrix. The liquid suspension of nAg-chitosan was deposited by the drop-coating method onto a glassy carbon electrode (GCE) surface to build a voltammetric sensor (nAg-chitosan/GCE sensor). The voltammetric sensor was successfully used for the detection of nitrocompounds. Under optimized experimental conditions, a reduction peak current was observed which increased with increasing concentrations of 4-nitrophenol (4-NP) in the range of 0.07 to 2.0 渭mol L<sup>鈭?sup> (R<sup>2sup> = 0.994). The visual detection limit was 70 nmol L<sup>鈭?sup>. At this level of concentration, the sensor was not sensitive to other nitrophenols. For concentrations higher than 0.05 mmol L<sup>鈭?sup> the sensor was sensitive to the three isomers, namely 2-NP, 3-NP and 4-NP. These findings indicate that the material comprised of chitosan-stabilized silver nanoparticles is a very promising candidate to assemble voltammetric sensors for practical applications in the field of analytical chemistry.