Various Nanostructures on Macroscopically Large Areas Prepared by Tunable Ion-Swelling

Abstract

Various nanostructures were fabricated by ion irradiation on large area (100) Si surfaces covered by colloidal Langmuir-Blodgett films as nanolithographic masks. The ordered structure of the Langmuir-Blodgett monolayer composed from spherical Stöber silica particles of 200 nm and 450 nm diameter offer the possibility to form local surface swelling patterns during the ion bombardment step. Utilizing the dependence of the surface morphology on the irradiation parameters the tunability of nanostructuring was studied for 40 keV Ar+ and 500 keV Xe2+ ions. We show that the periodicity of the resulted surface pattern is determined by the size of the masking particles, while the height of nanostructures can be tuned by the ion fluence. The quality of projection of the nanomask contours to the substrate-the contrast of masking-can be set by choosing appropriate ion energy, thereby determining the curvature of the surface pattern. Moreover, deformation of the nanomask due to ion-nanoparticle interactions should be taken into account since these effects can be also utilized for tailoring various structures. The silica masking layers before and after ion irradiation and the resulting Si surface patterns were investigated by field emission scanning electron microscopy and atomic force microscopy analysis.

Introducing nanoscaled surface morphology and percolation barrier network into mesoporous silica coatings

“…Nevertheless, NSL combined with ion implantation has been successfully applied to create laterally periodic doping patterns in Si wafers 38 and to form Si surface patterns by local ionswelling during ion implantation through ordered particulate mask. [39][40][41] Ion-beam techniques are rarely used on porous materials. So far, implantation of doping ions into porous titania was applied to change its optical and electronic properties 42 and irradiation with swift heavy ions was used to improve its photocatalytic activity.…”

Hysteresis of Isotherms of Mixed Monolayers of N-Octadecyl-N′-phenylthiourea and Stearic Acid at Air/Water Interface

“…Single component and mixed Langmuir monolayers at airwater interface continue to be of interest because they provide a model for studying ordering in two dimensions [1], they serve as precursors to Langmuir-Blodgett (LB) films [2][3][4], and they are used to incorporate nanoparticles [5][6][7][8][9][10][11][12][13][14] into LB films. They can also serve as templates for two-dimensional crystal growth [15][16][17][18][19] and they can be used to control crystal nucleation [20][21][22][23][24][25][26][27].…”