We have previously demonstrated a facile, chemomechanical method of simultaneously functionalizing and patterning silicon with single organic monolayers by scribing it while it is wet with 1-alkenes, [1] 1-alkynes, [1] and 1-haloalkanes. [2] Here we show that this method can be extended to create individual surfaces that have different monolayer coatings in distinct and precisely controlled regions (Figure 1). Like microcontact [*] Dr.

The reaction of epoxides with a bare silicon surface is reported (see scheme). Diepoxides yield amine‐reactive monolayers on scribed silicon. Controlled levels of epoxide functionality are obtained in mixed monolayers of 1,2‐epoxyoctane and 1,2,7,8‐diepoxyoctane.

Time-of-flight secondary ion mass spectrometry (ToF-SIMS) was performed on monolayers prepared by scribing silicon under a homologous series of 1-alkenes, 1-alkynes, and 1-haloalkanes:  CH2CH(CH2) n CH3 (n = 2, 5, 9), HC⋮C(CH2) n CH3 (n = 2, 5, 9), Cl(CH2) n CH3 (n = 4, 7, 9), Br(CH2) n CH3 (n = 4, 7, 11), I(CH2) n CH3 (n = 0, 1, 2, 4, 7, 11), and I13CH3. Numerous SiC x H y + and C x H y + fragments and adduct ions were observed. The results support a proposed binding model that 1-haloalkanes bind to the silicon surface through one C−Si bond and that 1-alkenes and 1-alkynes generally bind through two C−Si bonds. For instance, silicon surfaces scribed under 1-haloalkanes show less carbon by X-ray photoelectron spectroscopy (XPS) than silicon scribed under 1-alkenes and 1-alkynes with the same number of carbon atoms, but they show more intense SiC x H y + fragments by ToF-SIMS. Above a certain chain length, the relative intensities of the fragment and adduct ions for a homologous series generally increase with increasing alkyl chain length, which is in agreement with carbon surface coverages measured by XPS and the proposed binding models. Anomalously strong SiCH3 + and SiC2H5 + fragments observed in silicon scribed under CH3I and CH3CH2I suggest formation of methyl- and ethyl-terminated silicon, respectively. An isotopic study of silicon scribed under 13CH3I and CH3I provides additional evidence for formation of methyl-terminated silicon and suggests sputter-induced decomposition of the near-surface region by ToF-SIMS. Ab initio calculations of a few SiC x H y + type fragments are shown to verify assignments of structure. We also note an alternative explanation for some of the results based on the density of alkyl chains on the surfaces.

We have previously demonstrated a facile, chemomechanical method of simultaneously functionalizing and patterning silicon with single organic monolayers by scribing it while it is wet with 1-alkenes, [1] 1-alkynes, [1] and 1-haloalkanes. [2] Here we show that this method can be extended to create individual surfaces that have different monolayer coatings in distinct and precisely controlled regions (Figure 1). Like microcontact [*] Dr.

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