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A Molecule with Dual Functionality 4‐Aminophenylmethylphosphonic Acid: A Comparison Between Layers Formed on Indium Tin Oxide by In Situ Generation of an Aryl Diazonium Salt or by Self‐Assembly of the Phosphonic Acid
Author(s) -
Chen Xin,
Chockalingam Muthukumar,
Liu Guozhen,
Luais Erwann,
Gui Alicia L.,
Gooding J. Justin
Publication year - 2011
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.201100337
Subject(s) - indium tin oxide , moiety , salt (chemistry) , aryl , electrochemistry , adsorption , chemistry , self assembly , diazonium compounds , nanoparticle , molecule , layer (electronics) , inorganic chemistry , combinatorial chemistry , polymer chemistry , materials science , electrode , organic chemistry , nanotechnology , alkyl
4‐Aminophenylmethylphosphonic acid was grafted on ITO surfaces by 1) electrochemical reductive adsorption of the corresponding aryl diazonium salt and 2) by self‐assembly via the phosphonic acid moiety. The aryl diazonium salt derived surfaces are reasonably stable within a wide potential range from −600 mV to 600 mV compared to a very narrow stable range between −40 mV and 40 mV for the self‐assembled layers. The different surface stabilities were assessed with a view to forming ITO‐organic layer‐gold nanoparticle (AuNPs) constructs. As expected the ITO‐organic layer‐AuNPs construct formed by electrochemical adsorption (ITO‐Ph‐AuNP) was significantly more stable than the construct formed by self‐assembly of phosphonates (ITO‐PO 3 Ph‐AuNPs).