کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
866938 | 1470984 | 2013 | 5 صفحه PDF | دانلود رایگان |
► The AuNPs/graphene nanocomposites were obtained by simple NaBH4 reduction.
► Porphyrin was introduced to enhance the response of AuNPs/graphene.
► The photoelectrochemical behavior of modified electrode for HQ was investigated.
A novel light “on–off” photoelectrochemical sensing for the sensitive determination of hydroquinone was developed based on the porphyrin-functionalized Au nanoparticles on graphene (porphyrin/AuNPs/graphene). Gold nanoparticles (AuNPs) were firstly modified onto graphene sheets using NaBH4 as reductant and the porphyrin/AuNPs/graphene nanocomposites were then synthesized by self-assembly decoration of sulfhydryl porphyrin on AuNPs modified graphene sheets by S–Au bond. The porphyrin/AuNPs/graphene nanocomposites were characterized by transmission electron microscopy, X-ray photoelectron, and ultraviolet–visible absorption spectroscopies. The nanocomposites showed good dispersion in water and on indium tin oxide (ITO) surface. The resulting porphyrin/AuNPs/graphene modified ITO electrode showed good photoelectrochemical behavior toward the oxidation of hydroquinone (HQ) at 0 V under white light illumination. The proposed photoelectrochemical method could detect hydroquinone with a wide linear response ranging from 20 to 240 nM (R=0.9914). The detection limit was 4.6 nM for HQ (S/N=3). Thus, the nanocomposites would be expected to be a novel photoactive material for photoelectrochemical biosensing.
In this work, a novel light "on–off" photoelectrochemical sensing for the sensitive determination of hydroquinone was developed based on the porphyrin-functionalized Au nanoparticles by in situ decoration on graphene.Figure optionsDownload as PowerPoint slide
Journal: Biosensors and Bioelectronics - Volume 47, 15 September 2013, Pages 45–49