TY  - JOUR
A1  - Malyar, Ivan V.
A1  - Gorin, Dmitry A.
A1  - Santer, Svetlana
A1  - Stetsyura, Svetlana V.
T1  - Photocontrolled Adsorption of Polyelectrolyte Molecules on a Silicon Substrate
JF  - Langmuir
N2  - We report on a change in the properties of monomolecular films of polyelectrolyte molecules, induced by illuminating the silicon substrate on which they adsorb. It was found that under illumination the thickness of the adsorbed layer decreases by at least 27% and at the same time the roughness is significantly reduced in comparison to a layer adsorbed without irradiation. Furthermore, the homogeneity of the film topography and the surface potential is shown to be improved by illumination. The effect is explained by a change in surface charge density under irradiation of n- and p-type silicon wafers. The altered charge density in turn induces conformational changes of the adsorbing polyelectrolyte molecules. Their photocontrolled adsorption opens new possibilities for selective manipulation of adsorbed films. This possibility is of potential importance for many applications such as the production of well-defined coatings in biosensors or microelectronics.
Y1  - 2013
U6  - https://doi.org/10.1021/1a403838n
SN  - 0743-7463
VL  - 29
IS  - 32
SP  - 16058
EP  - 16065
PB  - American Chemical Society
CY  - Washington
ER  -