期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 109, 期 1, 页码 135-140出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2005.03.015
关键词
microneedles; microsyringes; macroporous silicon; electrochemical etching
This paper presents a novel technique for silicon dioxide (SiO2) microneedle fabrication. Microneedles are hollow microcapillaries with tip diameters in the range of micrometers. They can be used in the fabrication of microsyringes. These structures can be of high interest in medical and biological applications, such as DNA injection, antibody manipulation and drug delivery, and cell manipulation. Fabrication process is based on electrochemical etching of n-type silicon in hydrofluoric acid (HF) solutions. Basic process flow and etching conditions that ensure a stable pore growth are described. These conditions also determine the geometry of the resulting microneedle structure. Microneedle arrays of different dimensions can be fabricated in a single run on the same wafer. In this work, microneedle arrays with pore diameters ranging from 2 to 5 mu m, pore lengths from 30 to 140 mu m and wall thicknesses in the range of 70-110 nm are reported. (c) 2005 Elsevier B.V. All rights reserved.
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