Azidation of Silicon(111) Surfaces

Abstract

A two-step chlorination/azidation process was reported to prepare azide-modified silicon(111) surfaces. XPS and IR analyses show the covalent bonding of azide with silicon. In combination with scanning tunneling microscopy and spectroscopy analyses, different kinetic rates, azide coverages, and surface-area distributions were derived depending on the azidation solvent.

Microwave irradiated click reactions on silicon surfaces via derivertization of covalently grafted poly(PEGMA) brushes

“…It is approximately consistent with azide-terminated monolayers on planar Au [22,23] and Si [3,27] surfaces, and also on nanoparticles [50][51][52][53], as well as with azide-carried polymers [54,55]. These azide groups behave normally as organic groups, different from the direct bonding of AN 3 to silicon metal (SiAN 3 ), which was reported at 2168 cm À1 (v a (AN@N + @N À )), due to the proximity effect of silicon metals [8]. In our case, azides were attached on polymer brushes; therefore the density of azides is enhanced greatly, compared to monolayer azides [3,4,[7][8][9][22][23][24]26,48].…”

“…As a reactive intermediate, surface terminal chlorines can be easily substituted with azide groups [3,8,26,27,47,48].…”

“…Especially click chemistry is widely recognized in biomedical applications recently for its reaction in aqueous media and under room temperature. Either acetylene or azide moieties can be conveniently introduced onto solid surfaces [2][3][4][5][6][7][8][9][10][11][12][13][14] or combined with functional or biological molecules [4,6,[15][16][17][18][19][20][21]. Furthermore through click chemistry, a variety of probe molecules can be anchored onto solid surfaces for sensors and biochips.…”

Click Chemistry‐Based Functionalization on Non‐Oxidized Silicon Substrates

“…[48] DeScheme 2. Representative protection/deprotection approaches to obtain functionalized organic monolayers on non-oxidized silicon.…”

Monolayer formation of hydrocarbons with various reactive groups via photochemical reaction on Si(111)-H surface

“…The monolayer formation with unsaturated groups of acetylene, alcohols and thiols has been reperted. And the modifications of Si-H with halogenations and click reaction have been also reported [5,6]. In this way, Si-H surfaces can be modified by various methods, but the modification was not investigated in the unified treatment [7][8][9][10].…”