title: Biomolecule-free, selective detection of o-diphenol and its derivatives with WS2/TiO2-based photoelectrochemical platform.
abstract: Herein, a novel photoelectrochemical platform with WS2/TiO2 composites as optoelectronic materials was designed for selective detection of o-diphenol and its derivatives without any biomolecule auxiliary. First, catechol was chosen as a model compound for the discrimination from resorcinol and hydroquinone; then several o-diphenol derivatives such as dopamine, caffeic acid, and catechin were also detected by employing this proposed photoelectrochemical sensor. Finally, the mechanism of such a selective detection has been elaborately explored. The excellent selectivity and high sensitivity should be attributed to two aspects: (i) chelate effect of adjacent double oxygen atoms in the o-diphenol with the Ti(IV) surface site to form a five/six-atom ring structure, which is considered as the key point for distinction and selective detection. (ii) This selected WS2/TiO2 composites with proper band level between WS2 and TiO2, which could make the photogenerated electron and hole easily separated and results in great improvement of sensitivity. By employing such a photoelectrochemical platform, practical samples including commercial clinic drugs and human urine samples have been successfully performed for dopamine detection. This biomolecule-free WS2/TiO2 based photoelectrochemical platform demonstrates excellent stability, reproducibility, remarkably convenient, and cost-effective advantages, as well as low detection limit (e.g., 0.32 μmol L(-1) for dopamine). It holds great promise to be applied for detection of o-diphenol kind species in environment and food fields.
authors.affiliation: †State Key Laboratory of Electroanalytical Chemistry, c/o Engineering Laboratory for Modern Analytical Techniques, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, Jilin China.|‡University of Chinese Academy of Sciences, Beijing 100039, China.
authors.forename: Weiguang
authors.initials: W
authors.lastname: Ma
authors.affiliation: †State Key Laboratory of Electroanalytical Chemistry, c/o Engineering Laboratory for Modern Analytical Techniques, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, Jilin China.|‡University of Chinese Academy of Sciences, Beijing 100039, China.
authors.forename: Lingnan
authors.initials: L
authors.lastname: Wang
authors.affiliation: †State Key Laboratory of Electroanalytical Chemistry, c/o Engineering Laboratory for Modern Analytical Techniques, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, Jilin China.|‡University of Chinese Academy of Sciences, Beijing 100039, China.
authors.forename: Nan
authors.initials: N
authors.lastname: Zhang
authors.affiliation: †State Key Laboratory of Electroanalytical Chemistry, c/o Engineering Laboratory for Modern Analytical Techniques, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, Jilin China.
authors.forename: Dongxue
authors.initials: D
authors.lastname: Han
authors.affiliation: †State Key Laboratory of Electroanalytical Chemistry, c/o Engineering Laboratory for Modern Analytical Techniques, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, Jilin China.
authors.forename: Xiandui
authors.initials: X
authors.lastname: Dong
authors.affiliation: †State Key Laboratory of Electroanalytical Chemistry, c/o Engineering Laboratory for Modern Analytical Techniques, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, Jilin China.
authors.forename: Li
authors.initials: L
authors.lastname: Niu
mesh_terms: D055664:Electrochemical Techniques; D010316:Particle Size; D010636:Phenols / Q000032:analysis* / Q000737:chemistry*; D055668:Photochemical Processes; D013237:Stereoisomerism; D013440:Sulfides / Q000737:chemistry*; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry*; D014414:Tungsten / Q000737:chemistry*
chemical_list: D010636:Phenols; D013440:Sulfides; C009495:titanium dioxide; D014025:Titanium; D014414:Tungsten