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Technological development of intracellular polysilicon–chromium–gold chips for orthogonal chemical functionalization

Durán, S.; Duch, M.; Patiño, T.; Torres, A.; Penon, O.; Gómez-Martínez, R.; Barrios, L.; Esteve, J.; Nogués, C.; Pérez-García, L.; Plaza, J.A.

Authors

S. Durán

M. Duch

T. Patiño

A. Torres

O. Penon

R. Gómez-Martínez

L. Barrios

J. Esteve

C. Nogués

J.A. Plaza



Abstract

Increasingly, advances in microtechnologies are focused on obtaining new chips intended for applications in fields such as nanomedicine and cell biology, taking advantage of the ability of microelectronics to manufacture devices with cell dimensions and a large variety of features. Here, we report a technology for the fabrication of multi-material chips, using polysilicon and gold as device layers, to be used as bi-functional cell-internalizable devices. In our case, one of the main technological challenges is to overcome the low adherence between these two materials, especially because of their small contact-area, only 9 μm2. Thus, in order to circumvent this difficulty a chromium adherent-layer was deposited in between. After fabrication, the devices following this design can be successfully internalized inside living macrophages without affecting their viability. The advantage of having multiple material layers in one device is the potential to render multi-tasking chips, as once they are appropriately functionalized, we can provide the chip the ability of being multi-functional. Hence, and as a proof of concept, two different proteins, Wheat Germ Agglutinin (WGA) and Concanavalin (ConA), were immobilized on the chip surface through self-assembled monolayers using orthogonal chemistry. The results of this work show a well-controlled fabrication, the bi-functional capabilities and no cell-toxicity of intracellular polysilicon–chromium–gold chips. Eventually, two different dyes (Oregon Green® 488 and BODIPY® 581/591) were used to bi-functionalize each surface of the multi-material chip in order to demonstrate that functional chips can also be internalized in living cells. These devices have a promising future as intracellular functional platforms for biosensing, drug delivery and diagnosis.

Journal Article Type Article
Publication Date Mar 31, 2015
Journal Sensors and Actuators B: Chemical
Print ISSN 0925-4005
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 209
Pages 212-224
APA6 Citation Durán, S., Duch, M., Patiño, T., Torres, A., Penon, O., Gómez-Martínez, R., …Plaza, J. (2015). Technological development of intracellular polysilicon–chromium–gold chips for orthogonal chemical functionalization. Sensors and Actuators B: Chemical, 209, 212-224. doi:10.1016/j.snb.2014.11.077
DOI https://doi.org/10.1016/j.snb.2014.11.077
Publisher URL https://www.sciencedirect.com/science/article/pii/S0925400514014609
Additional Information This article is maintained by: Elsevier; Article Title: Technological development of intracellular polysilicon–chromium–gold chips for orthogonal chemical functionalization; Journal Title: Sensors and Actuators B: Chemical; CrossRef DOI link to publisher maintained version: https://doi.org/10.1016/j.snb.2014.11.077; Content Type: article; Copyright: Copyright © 2014 Elsevier B.V. All rights reserved.
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