15803716

Source:http://linkedlifedata.com/resource/pubmed/id/15803716

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Predicate	Object
rdf:type	pubmed:Citation
lifeskim:mentions	umls-concept:C0009491, umls-concept:C0018026, umls-concept:C0028953, umls-concept:C0032207, umls-concept:C0205148, umls-concept:C0439851, umls-concept:C0439858, umls-concept:C1552596, umls-concept:C1579762, umls-concept:C1706853, umls-concept:C1879748, umls-concept:C1947931
pubmed:issue	4
pubmed:dateCreated	2005-4-4
pubmed:abstractText	The assembly of thioacetyl-terminated oligo(phenylene ethynylene)s (OPEs) on Au and Pt surfaces under an electric potential (electrochemical assembly, EA) was compared to assembly at an open circuit (conventional self-assembly, CSA). Cyclic voltammetry and ellipsometry were used to characterize the adsorption kinetics of self-assembled monolayers formed by these two techniques. The adsorption rate of the EA was remarkably faster at positive potentials but slower at negative potentials than that of the CSA, The EA at 400 mV proceeded about 800 times faster than the CSA when exposed to the same solution concentrations. The adsorption rates of both EA and CSA were found to be dependent on the molecular structures of OPEs. OPEs containing electron-donating groups assemble faster than those with electron-withdrawing groups. The amount of time that the thioacetyl-terminated OPE is in the presence of the base, for removal of the acetyl group to generate the thiolate, is called the deprotection time. Deprotection times play a critical role in achieving the maximum difference in adsorption rates between the EA and the CSA. The assembly must be initiated no later than 5 min after the basic deprotection is commenced so that the thiolate concentration remains low. The difference in the adsorption rates between EA and CSA might enable selective deposition of certain OPEs onto specific electrodes.
pubmed:language	eng
pubmed:journal	http://linkedlifedata.com/resource/pubmed/journal/9882736
pubmed:status	PubMed-not-MEDLINE
pubmed:month	Feb
pubmed:issn	0743-7463
pubmed:author	pubmed-author:DirkShawn MSM, pubmed-author:LongChengC, pubmed-author:PriceDavid WDWJr, pubmed-author:TourJames MJM, pubmed-author:YangJipingJ, pubmed-author:YaoYuxingY
pubmed:issnType	Print
pubmed:day	17
pubmed:volume	20
pubmed:owner	NLM
pubmed:authorsComplete	Y
pubmed:pagination	1335-41
pubmed:year	2004
pubmed:articleTitle	Comparative study of electrochemically directed assembly versus conventional self-assembly of thioacetyl-terminated oligo(phenylene ethynylene)s on gold and platinum surfaces.
pubmed:affiliation	Department of Chemistry and Center for Nanoscale Science & Technology, Rice University, Houston, Texas 77005, USA.
pubmed:publicationType	Journal Article