Directed assembly of inorganic nanoparticles into functional materials

IEC 219

Chad Mirkin, Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, IL 60208-3113 and David Ginger, Chemistry, Northwestern University, Evanston, IL 60208-3113.
Dip-Pen Nanolithography (DPN) is a scanning probe technique in which an AFM tip is used to generate nanoscale patterns of specific chemical functionality. DPN offers the ability to pattern a wide variety of molecules, ranging from simple alkanethiols to complex biomolecules, on a wide variety of substrates, including metals and semiconductors as well as monolayer-functionalized surfaces. By using the high resolution and registration afforded by DPN, we are thus able to fabricate templates for exploring the directed self-assembly of nanostructures using a variety of tailorable chemical interactions. Interactions ranging from redox-controlled electrostatics to the specific Watson-Crick base pairing of DNA are demonstrated as methods for directing the assembly of functionalized nanoscale building blocks onto DPN-generated surface templates.