Inkjet printing as a tool for the patterned deposition of octadecylsiloxane monolayers on silicon oxide surfaces

Abstract

We present a case study about inkjet printing as a tool for molecular patterning of silicon oxide surfaces with hydrophobic functionality, mediated by n-octadecyltrichlorosilane (OTS) molecules. In contrast to state-of-the-art techniques such as micro contact printing or chemical immersion with subsequent lithography processes, piezo drop-on-demand inkjet printing does not depend on physical masters, which allows an effective direct-write patterning of rigid or flexible substrates and enables short run-lengths of the individual pattern. In this paper, we used mesithylene-based OTS inks, jetted them in droplets of 10 pL on a silicon oxide surface, evaluated the water contact angle of the patterned areas and fitted the results with Cassie's law. For inks of 2.0 mM OTS concentration, we found that effective area coverages of 38% can be obtained. Our results hence show that contact times of the order of hundred milliseconds are sufficient to form a pattern of regions with OTS molecules adsorbed to the surface, representing at least a fragmented, inhomogeneous self-assembled OTS monolayer (OTS-SAM).

Covalent Surface Modification of Oxide Surfaces

“…Contact times in the order of hundred milliseconds are sufficient to form a pattern of (inhomogeneous) self‐assembled octadecyltrichlorosilane (OTS) monolayers (Figure 7). 47…”

Methods of surface chemical patterning

“…В зави-симости от метода создания давления в печатной головке принтеры можно разделить на термиче-ские, пьезоэлектрические, акустические, элек-тростатические и электродинамические. В нас-тоящее время из-за простоты и дешевизны струй-ная печать широко используется для создания рисунков из полимерных материалов [25], неор-ганических частиц [26], кристаллических пле-нок в микроэлектронике [27], химических сое-динений [28], а также применяется в разработке и произ водстве биосенсоров [29][30][31]. Кроме того, функционал современной струйной печати рас-ширен до печати живыми клетками с возможно-стью создания живых тканей [32].…”

“…Printers can be divided into thermal, piezoelectric, acoustic, electrostatic, and electrodynamic according to the way of pressure generation in the print head. Currently, thanks to its low price and simplicity, inkjet printing is popular in making patterns from polymeric materials [25], inorganic particles [26], crystal films for microelectronic purposes [27], and chemicals [28]; it is also widely used in development and manufacture of biosensors [29][30][31]. Besides, modern inkjet printing methods have shown capability to print with intact cells and form intact tissues [32].…”

Self‐Assembly of Ordered Colloidal Nanoparticle Films in Few‐Micron Wide Laser‐Desorbed Lines of Octadecylsiloxane Monolayers on Silicon Oxide Surfaces

“…[35,36,[60][61][62][63] For the experiments described in this work, Si:SiO 2 4 00 þ (p-doped or undoped) (100) wafers (total thickness: (525 AE 10) mm, resistivity: 5-10 or 1-8 Ohm cm À1 , thickness of thermally grown oxide layer: 100 nm-1 mm) were used as Fig. 6.…”

“…These results could be used to suggest a digital and additive technique of SAM growth from octadecyltrichlorosilane (OTS) molecules on silicon oxide based on dropon-demand inkjet printing and self-assembly of the alkylsilane molecules during evaporation of the deposited 10 pL mesitylene droplet. [36] Polymer nanoparticles with a diameter of a few hundred nanometers are typical building blocks for three-dimensionally (3D) stacked colloidal crystals, which in the case of high structural order form a photonic stop band in the visible range and are hence called PC. In general, such nanoparticle solids can be prepared by top-down microstructuring methods or bottom-up self-assembly techniques, e.g., from colloidal particles suspended in aqueous media.…”