Synthesis and Electrochemistry of 6 nm Ferrocenated Indium鈥揟in Oxide Nanoparticles

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• 作者：Joseph J. P. Roberts ; Kim T. Vuong ; Royce W. Murray
• 刊名：Langmuir
• 出版年：2013
• 出版时间：January 8, 2013
• 年：2013
• 卷：29
• 期：1
• 页码：474-479
• 全文大小：358K
• 年卷期：v.29,no.1(January 8, 2013)
• ISSN：1520-5827

文摘

Indium鈥搕in oxide (ITO) nanoparticles, 6.1 卤 0.8 nm in diameter, were synthesized using a hot injection method. After reaction with 3-aminopropyldimethylethoxysilane to replace the initial oleylamine and oleic acid capping ligands, the aminated nanoparticles were rendered electroactive by functionalization with ferrocenoyl chloride. The nanoparticle color changed from blue-green to light brown, and the nanoparticles became more soluble in polar solvents, notably acetonitrile. The nanoparticle diffusion coefficient (D = 1.0 脳 10^鈥? cm²/s) and effective ferrocene concentration (C = 0.60 mM) in acetonitrile solutions were determined using ratios of DC and D^1/2C data measured by microdisk voltammetry and chronoamperometry. The D result compares favorably to an Einstein鈥揝tokes estimate (2.1 脳 10^鈥? cm²/s), assuming an 8 nm hydrodynamic diameter in acetonitrile (6 nm for the ITO core plus 2 nm for the ligand shell). The ferrocene concentration result is lower than anticipated (ca. 1.60 mM) based on a potentiometric titration of the ferrocene sites with Cu(II) in acetonitrile. Cyclic voltammetric data indicate tendency of the ferrocenated nanoparticles to adsorb on the Pt working electrode.