Campos Bruno B, Oliva María Moreno, Contreras-Cáceres Rafael, Rodriguez-Castellón Enrique, Jiménez-Jiménez José, da Silva Joaquim C G Esteves, Algarra Manuel
Centro de Investigação em Química, Departamento de Geociencias, ambiente e ordenamento do territorio, Faculdade de Ciências da, Universidade do Porto, Porto, Portugal.
Departamento de Química Física, Facultad de Ciencias, Universidad de Málaga, Campus de Teatinos s/n, 29071 Málaga, Spain.
J Colloid Interface Sci. 2016 Mar 1;465:165-73. doi: 10.1016/j.jcis.2015.11.059. Epub 2015 Nov 24.
Carbon quantum dots (CQDs) coated with poly(amidoamine) (PAMAM-NH2) dendrimer are prepared from folic acid and phosphoric acid under a hydrothermal procedure. The obtained nanoparticles are successfully used as fluorescent sensor for Pt(IV) (in the form of chloroplatinate ion). CQDs possess many attractive features including uniform dispersion with average size about 13nm for unmodified particles and, ∼30nm when they are coated with PAMAM-NH2 dendrimer. The synthesized nanoparticles have been characterized by elemental analysis, attenuated total reflectance (ATR), X-ray photoelectron (XPS) and Raman spectroscopies, transmission electron microscopy (TEM), dynamic light scattering (DLS), and steady-state and life-time fluorescence. CQDs are used as fluorescent sensor of Pt(IV) ion in aqueous media showing linear quenching effect of their fluorescence. The results obtained demonstrated a limit of detection of 657nM with an accuracy of the method of 0.13% (as RSD, n=10) and sensitivity of 78nM. Moreover, with the presence of other interference species, good results are obtained when applied in real samples from platinum nanoparticles synthesis. The dissolved platinum ions can be quantified in the range 6-96μM with an accuracy of 2.5%.
在水热条件下，由叶酸和磷酸制备了包覆聚（酰胺胺）（PAMAM-NH2）树枝状大分子的碳量子点（CQD）。所得纳米颗粒成功用作Pt(IV)（氯铂酸根离子形式）的荧光传感器。CQD具有许多吸引人的特性，包括未修饰颗粒平均尺寸约为13nm，而包覆PAMAM-NH2树枝状大分子时尺寸约为30nm，且分散均匀。合成的纳米颗粒已通过元素分析、衰减全反射（ATR）、X射线光电子能谱（XPS）和拉曼光谱、透射电子显微镜（TEM）、动态光散射（DLS）以及稳态和寿命荧光进行了表征。CQD用作水介质中Pt(IV)离子的荧光传感器，其荧光呈现线性猝灭效应。所得结果表明检测限为657nM，方法准确度为0.13%（相对标准偏差，n = 10），灵敏度为78nM。此外，在存在其他干扰物质的情况下，应用于铂纳米颗粒合成的实际样品时也获得了良好结果。溶解的铂离子在6 - 96μM范围内可定量，准确度为2.5%。
