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• W2082916820 endingPage "265302" @default.
• W2082916820 startingPage "265302" @default.
• W2082916820 abstract "The initiation and high resolution control of surface confined chemical reactions would be both beneficial for nanofabrication and fundamentally interesting. In this work, mechanistic aspects of spatially confined Suzuki and Heck 'catalytic nanolithography' are investigated by varying the experimental parameters and noting their effects on apparent reactivity and lithographic yield. A variety of molecular couplings can be driven by the activated scanning probe with linewidths ultimately limited by its functional apex. On ramping the speed at which the probe traverses the surface confined reagent, one reaches a limit where the catalytic chemistry becomes limiting and reaction rates can be estimated. Self-assembled monolayer (SAM) confined bromide reagents are observed to be more labile than their iodide analogues in Suzuki couplings. With Heck reactions, coupling rates are observed to be faster with the styrene surface confined than in the 'inverted configuration' with an aryl halide SAM, possibly because the accepted (solution phase) rate-determining step is bypassed in the former configuration. For both Heck and Suzuki coupling reactions, calculations indicate that catalyst turnover numbers per nanoparticle are an order of magnitude or more greater within the confines of the AFM probe–surface junction compared to solution phase reactions. A PVP matrix model is presented to account for these observations and the mechanism of catalytic nanolithography." @default.
• W2082916820 created "2016-06-24" @default.
• W2082916820 creator A5061234871 @default.
• W2082916820 creator A5085191708 @default.
• W2082916820 date "2010-06-11" @default.
• W2082916820 modified "2023-09-24" @default.
• W2082916820 title "Mechanistic studies of AFM probe-driven Suzuki and Heck molecular coupling" @default.
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• W2082916820 doi "https://doi.org/10.1088/0957-4484/21/26/265302" @default.
• W2082916820 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/20543234" @default.
• W2082916820 hasPublicationYear "2010" @default.
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