Faculty of Chemistry, Bu-Ali Sina University, Hamedan, Iran.
Faculty of Chemistry, Bu-Ali Sina University, Hamedan, Iran.
Talanta. 2015 Jan;131:548-55. doi: 10.1016/j.talanta.2014.08.004. Epub 2014 Aug 20.
A novel nanographene carbon composite potentiometric sensor for the determination of trace amounts of silver(I) ion was fabricated. Its sensing layer was prepared with the addition of graphene nanosheets into the matrix consisting of graphite powder, diphenylacetylene "a typically molecular wire (MW) as the conductive binder" and thionine as an efficient ionophore. For investigation of the ion-to-electron transducing ability of graphene nanosheets and molecular wire on the electrode surface, the electrochemical impedance spectroscopy measurements were done and the morphology and properties of the electrode surfaces were characterized by scanning electron microscopy. Under the optimized experimental conditions, the suggested potentiometric silver(I) sensor exhibited an excellent Nernstian slope of 59.70 mV decade(-1) with a rapid response to silver(I) ion within ~ 6s. The response was linear in the range 8.00 × 10(-9) to 1.00 × 10(-2) mol L(-1) and calculated detection limit was 4.17 × 10(-9) mol L(-1). The suggested sensor was successfully applied to the determination of silver in radiological film, environmental and drug samples with satisfactory results.
一种用于测定痕量银（I）离子的新型纳米石墨烯碳复合电位传感器已被制备。其传感层是通过在由石墨粉末、二苯乙炔（“典型的分子线（MW）作为导电粘结剂”）和硫堇组成的基质中加入石墨烯纳米片制备的。为了研究石墨烯纳米片和分子线在电极表面的离子-电子转换能力，进行了电化学阻抗谱测量，并通过扫描电子显微镜对电极表面的形貌和性质进行了表征。在优化的实验条件下，所提出的电位银（I）传感器表现出优异的 Nernst 斜率为 59.70 mV 每 decade(-1)，对银（I）离子的快速响应时间约为 6s。该响应在 8.00 × 10(-9) 到 1.00 × 10(-2) mol L(-1)的范围内呈线性，计算出的检测限为 4.17 × 10(-9) mol L(-1)。该传感器已成功应用于放射性胶片、环境和药物样品中银的测定，结果令人满意。
