title: Immobilization of quantum dots via conjugated self-assembled monolayers and their application as a light-controlled sensor for the detection of hydrogen peroxide.
abstract: A light-addressable gold electrode modified with CdS and FePt or with CdS@FePt nanoparticles via an interfacial dithiol linker layer is presented. XPS measurements reveal that trans-stilbenedithiol provides high-quality self-assembled monolayers compared to benzenedithiol and biphenyldithiol, in case they are formed at elevated temperatures. The CdS nanoparticles in good electrical contact with the electrode allow for current generation under illumination and appropriate polarization. FePt nanoparticles serve as catalytic sites for the reduction of hydrogen peroxide to water. Advantageously, both properties can be combined by the use of hybrid nanoparticles fixed on the electrode by means of the optimized stilbenedithiol layer. This allows a light-controlled analysis of different hydrogen peroxide concentrations.
authors: Fachbereich Physik and WZMW, Philipps-Universität Marburg, Marburg, Germany.
authors: Waqas
authors: W
authors: Khalid
authors: Mira
authors: M
authors: El Helou
authors: Tobias
authors: T
authors: Murböck
authors: Zhao
authors: Z
authors: Yue
authors: Jose-Maria
authors: JM
authors: Montenegro
authors: Kirsten
authors: K
authors: Schubert
authors: Gero
authors: G
authors: Göbel
authors: Fred
authors: F
authors: Lisdat
authors: Gregor
authors: G
authors: Witte
authors: Wolfgang J
authors: WJ
authors: Parak
mesh_terms: D015374:Biosensing Techniques / Q000295:instrumentation*; D019187:Cadmium Compounds / Q000737:chemistry* / Q000528:radiation effects; D004566:Electrodes; D004867:Equipment Design; D019544:Equipment Failure Analysis; D006861:Hydrogen Peroxide / Q000032:analysis*; D008027:Light; D036103:Nanotechnology / Q000295:instrumentation*; D010783:Photometry / Q000295:instrumentation*; D045663:Quantum Dots; D011829:Radiation Dosage; D018036:Selenium Compounds / Q000737:chemistry* / Q000528:radiation effects
chemical_list: D019187:Cadmium Compounds; D018036:Selenium Compounds; C058667:cadmium selenide; D006861:Hydrogen Peroxide