Electrostatic Assembly of Gold Colloidal Nanoparticles on Organosilane Monolayers Patterned by Microcontact Electrochemical Conversion

Abstract

A new approach is introduced for electrostatically guided adsorption of colloidal nanoparticles onto a patterned self-assembled monolayer (SAM) with feature sizes ranging from nm to mm. Patterning of the adsorption templates is realized by electric-field-induced anodic oxidation of aminosilane SAM using an ink-free method. In this versatile method, both "positive" and "negative" type pattern transfers are possible. The chemically converted patterns are induced by localized electrical fields on the microcontacted areas, and the patterning resolution is insensitive to the diffusion of oxidizing agents because of the self-limiting oxidation kinetics, thereby enabling high-resolution, large-scale parallel patterning.

Microcontact printing of quantum dot bioconjugate arrays for localized capture and detection of biomolecules

“…Submicrometer printing of CdTe QDs, gold, and iron oxide nanoparticles have been successfully demonstrated using microcontact printing, (Santhanam and Andres 2005;Chen et al 2006;Guo et al 2002) and thus we expect that the current resolution limit can be extended for printing small groups or individual QDs with higher resolution PDMS stamps.…”

“…Microcontact-printing has been a well-developed method for printing monolayers of arrayed proteins onto flat surfaces with high resolution (Renault et al 2002;Whitesides et al 2001;Kane et al 1999;Bernard et al 1998;Liu and Amro 2002). This technique has been used to pattern gold, iron, polystyrene nanoparticles, as well as more recently, quantum dots (Wu et al 2006;Santhanam and Andres 2005;Chen et al 2006;. Less examined has been the use of microcontact printing of QD coupled with biomolecules such as proteins and peptides to produce stable, biologically-active surfaces comprised of immobilized QD bioconjugate probes.…”

Plasma induced patterning of polydimethylsiloxane surfaces

“…In particular, surfaces with patterned chemical functionalities can serve as templates for directed self-assembly of nanoparticles [8,9], biomolecules, and antibodies [10,11], and are employed in the development of micro-scale biochip and sensor devices.…”

Electrosynthesized poly(1,6-hexanedithiol) as a new immobilization matrix for Au-nanoparticles-enhanced piezoelectric immunosensing

“…2b) of the AuNPs/HPDT/Au electrode also gave $30% coverage of AuNPs, supporting the validation of the obtained g AuNPs . The obtained low coverage of AuNPs is supported by other groups [44,45], and it is thus interesting to seek new protocols, rather than direct AuNPs adsorption, to more effectively increase nano-immobilization sites and density for biosensing in the future.…”