title: Photoelectrochemical sensing for hydroquinone based on porphyrin-functionalized Au nanoparticles on graphene.
abstract: 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 0V under white light illumination. The proposed photoelectrochemical method could detect hydroquinone with a wide linear response ranging from 20 to 240nM (R=0.9914). The detection limit was 4.6nM for HQ (S/N=3). Thus, the nanocomposites would be expected to be a novel photoactive material for photoelectrochemical biosensing.
authors.affiliation: Key Laboratory of Bioelectrochemistry & Environmental analysis of Gansu Province, College of Chemistry & Chemical Engineering, Northwest Normal University, Lanzhou 730070, China.
authors.forename: Yaqi
authors.initials: Y
authors.lastname: Hu
authors.forename: Zhonghua
authors.initials: Z
authors.lastname: Xue
authors.forename: Hongxia
authors.initials: H
authors.lastname: He
authors.forename: Ruixia
authors.initials: R
authors.lastname: Ai
authors.forename: Xiuhui
authors.initials: X
authors.lastname: Liu
authors.forename: Xiaoquan
authors.initials: X
authors.lastname: Lu
mesh_terms: D015374:Biosensing Techniques / Q000379:methods*; D055664:Electrochemical Techniques; D006046:Gold / Q000737:chemistry; D006108:Graphite / Q000737:chemistry*; D006801:Humans; D006873:Hydroquinones / Q000302:isolation & purification*; D053768:Metal Nanoparticles / Q000737:chemistry*; D011166:Porphyrins / Q000737:chemistry
chemical_list: D006873:Hydroquinones; D011166:Porphyrins; D006046:Gold; D006108:Graphite; C031927:hydroquinone