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Fabrication and characterization of gold coated hollow silicon microneedle array for drug delivery

Vinayakumar, KB and Hegde, GM and Nayak, MM and Dinesh, NS and Rajanna, K (2014) Fabrication and characterization of gold coated hollow silicon microneedle array for drug delivery. In: MICROELECTRONIC ENGINEERING, 128 . pp. 12-18.

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Official URL: http://dx.doi.org/ 10.1016/j.mee.2014.05.039


In this paper, we present the fabrication and characterization of Ti and Au coated hollow silicon microneedles for transdermal drug delivery applications. The hollow silicon microneedles are fabricated using isotropic etching followed by anisotropic etching to obtain a tapered tip. Silicon microneedle of 300 mu m in height, with 130 mu m outer diameter and 110 mu m inner diameter at the tip followed by 80 mu m inner diameter and 160 mu m outer diameter at the base have been fabricated. In order to improve the biocompatibility of microneedles, the fabricated microneedles were coated with Ti (500 nm) by sputtering technique followed by gold coating using electroplating. A breaking force of 225 N was obtained for the fabricated microneedles, which is 10 times higher than the skin resistive force. Hence, fabricated microneedles can easily be inserted inside the skin without breakage. The fluid flow through the microneedles was studied for different inlet pressures. A minimum inlet pressure of 0.66 kPa was required to achieve a flow rate of 50 mu l in 2 s with de-ionized water as a fluid medium. (C) 2014 Elsevier B.V. All rights reserved.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the ELSEVIER SCIENCE BV, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Keywords: Microneedles; Dry etching; Sputtering; Electroplating
Department/Centre: Division of Electrical Sciences > Electronic Systems Engineering (Formerly Centre for Electronic Design & Technology)
Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Division of Physical & Mathematical Sciences > Instrumentation Appiled Physics
Date Deposited: 03 Sep 2014 10:51
Last Modified: 03 Sep 2014 10:51
URI: http://eprints.iisc.ac.in/id/eprint/49742

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