Interfacial Electron Transfer from CdSe/ZnS Quantum Dots to TiO2 Nanoparticles: Linker Dependence at Single Molecule Level. Issue 4 (10th February 2013)

• Record Type: Journal Article
• Authors: Chang, Yu‐Pin; Tsai, Po‐Yu; Lee, Hsin‐Lung; Lin, King‐Chuen
• Is Part Of: Electroanalysis. Volume 25:Issue 4(2013:Apr.)
• Page Start: 1064
• Page End: 1073
• Publication Date: 2013-02-10
• Subjects: Electrochemical analysis -- Periodicals; Chemistry, Analytical -- Periodicals; Electrochemistry -- Periodicals; 543.4
• DOI: 10.1002/elan.201200618
• Languages: English
• ISSNs: 1040-0397

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>We utilize single molecule spectroscopy combined with time‐correlated single‐photon counting to probe electron transfer (ET) kinetics from CdSe/ZnS (core/shell) quantum dots (QDs) to TiO₂ through various lengths of linker molecules. The QD‐linker‐TiO₂ complexes with varied linker length, linker structure, and QD size are fabricated by a surface‐based stepwise method to show control of the rate and of the magnitude of fluctuations of photo‐induced ET at the single molecule level. The ET rate constants are determined to be 2.8×10⁷, 1.9×10⁷, and 3.5×10⁶ s⁻¹ for the chain length of 1.5, 6.2 and 13.8 Å, respectively. The electronic coupling strengths between QDs and TiO₂ are further calculated to be 3.68, 3.60, and 1.59 cm⁻¹ for the three different chain lengths by using the Marcus ET model.</p> </abstract>