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Single positively charged particle trapping in nanofluidic systems

Sharma, Deepika and Gerspach, Michael Adrian and Pfohl, Thomas and Lim, Roderick Y. H. and Ekinci, Yasin. (2017) Single positively charged particle trapping in nanofluidic systems. Microelectronic Engineering, 175. pp. 43-49.

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Official URL: http://edoc.unibas.ch/56108/

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Abstract

High-throughput and contact-free trapping of single nano-objects in an aqueous solution is of substantial interest for fundamental and applied research. One of the several trapping methods is geometry-induced electrostatic (GIE) trapping that allows for passive spatial confinement of single nanoparticles in nanofluidic devices. In aqueous environments (pH > 2) glass and silicon dioxide surfaces acquire a net negative surface charge density due to the self-dissociation of terminal silanol groups. Thus, with native glass/silicon-based GIE-trapping devices only negatively charged nano-objects can be trapped, limiting the applications of this method. In this work, we have performed surface modifications of glass-based GIE-trapping nanofluidic devices to enable the trapping of positively charged nanoparticles. For surface functionalization of the devices, a layer transfer of poly(ethyleneimine) electrolytes were used which provides a net positive surface charge density. We demonstrate the successful confinement of positively charged 60 nm gold nanoparticles inside the functionalized devices, and present a comparison study between trapping of negatively- and positively charged particles in native and functionalized devices, respectively. (C) 2017 Elsevier B.V. All rights reserved.
Faculties and Departments:05 Faculty of Science > Departement Chemie > Chemie > Biophysikalische Chemie (Pfohl)
UniBasel Contributors:Pfohl, Thomas and Lim, Roderick Y.H.
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Elsevier
ISSN:0167-9317
e-ISSN:1873-5568
Note:Publication type according to Uni Basel Research Database: Journal article
Identification Number:
Last Modified:26 Aug 2019 08:01
Deposited On:18 Sep 2017 08:30

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