Synthesis of Photodegradable Surface Modifiers Based on Phosphonic Acid for Introducing Functional Groups onto a Substrate and Application for Patterned Deposition of Gold Nano-Particulate Ink

Abstract

Techniques for selective deposition of conductive inks, in particular metal nano-particulate inks, by using self-assembling monolayers (SAMs) mostly involve control of wettability with highly hydrophobic compounds. In this work, we focused on electrostatic interaction of metal nano-particles and investigated the influence of functional groups on the substrate upon selective deposition of metal nanoparticles. Surface modifiers bearing four kinds of functional groups (-OH, -NH2, -SH, -COOH) protected by a photodegradable 2-nitrobenzyl ester were synthesized and used to form SAMs on an indium tin oxide-coated glass substrate. UV-irradiation through a photomask generated the respective functional group in exposed regions. High-quality patterning of aqueous Au nano-particulate ink, which is negatively charged, was successfully achieved by spin coating onto amine-bearing SAMs. These results suggest the feasibility of micro-scale patterning based on electrostatic interaction between Au nano-particles and free amino groups introduced onto the substrate by photoirradiation-induced deprotection of surface-modifying agents.

Don’t Forget Langmuir–Blodgett Films 2020: Interfacial Nanoarchitectonics with Molecules, Materials, and Living Objects

“…Observation and understanding of nanosized objects and nanolevel phenomena are rapidly developed. , On the other hand, recent material innovations strongly focus on low-dimensional materials, especially 2D materials. − This progress actively contributes to various social demands including energy, , the environment, , and biomedical issues. , These emerging trends, nanolevel properties, and 2D material systems fit well with the research focus on thin film technologies, SAMs, LbLs, and LB. In fact, the importance of surfaces and interfaces is well recognized in various research systems including (i) basic science based on molecular assembly, film formation, nanomaterial assembly, − surface modification, − surface wettability, , interfacial reactions, , catalysis, − electrochemistry, surface-specific properties, , and properties of 2D materials, (ii) interfacial designs and understanding for devices such as solar cells, , sensors, , organic field-effect transistors, batteries, , light-emitting diodes, and device fabrication, , and (iii) interfacial biorelated phenomena such as interfacial water structures, microscopic biomaterial interfaces, drug permeation through membranes, enzyme regulation, , and tissue engineering , (Figure ).…”