Organosilane-functionalized wide band gap semiconductor surfaces

Abstract

Surface functionalization of wide band gap semiconductors, SiC, ZnO, and GaN, with organosilane is reported. Formation of self-assembled monolayers of mercaptopropyltrimethoxysilane is confirmed by x-ray photoelectron spectroscopy and atomic force microscopy. The molecules are adsorbed on the surfaces through the silane groups with the free thiol groups molecularly oriented away from the surface. Moreover, chemisorption via the thiolate is observed for the ZnO surface. Immobilization of a model biomolecule to the functionalized surface is demonstrated. An amino acid derivative, i.e., phosphotyrosine derived thiol, is linked on the functionalized ZnO and GaN surfaces via formation of disulfide bridges.

ZnO nanoparticles or ZnO films: A comparison of the gas sensing capabilities

“…It can be operated as a FET gas sensor, a resonator because of its piezoelectric properties and as resistivity sensor. Furthermore, we have previously taken advantage of the oxygen atoms present in the surface of the ZnO when we performed successful functionalization of the ZnO with biomolecules as a step towards a multifunctional transducer for biosensor devices [14,15].…”

Surface modification and immobilization in poly(acrylic acid) of Ag/ZnO for photocatalytic degradation of endocrine‐disrupting compounds

“…In addition, the peak at 1030 cm −1 , corresponding to the formation of Si‐O‐Si layer on Ag/ZnO surface, confirms the silanization of the photocatalyst preventing aggregation by means of steric hindrance. It was proposed that oxygen binds with the zinc surface and that the condensation results in the formation of a self‐assembled monolayer (Si‐O‐Si) …”

New transducer material concepts for biosensors and surface functionalization

“…We have shown successful binding to ZnO and also SiC surfaces by e.g. APTES, which forms the basis for further attachment of many biomolecules [8][9][10].…”