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3 Tufts engineering faculty earn prestigious national awards for promising research
Date:3/23/2010

rant is for five years.

Optical methods such as NIRS are emerging as promising non-invasive imaging tools for fundamental study of biological processes and structures, and to examine human tissue to identify disease. However, visibility of superficial and deep structures using optical methods remains fairly poor because of sensor equipment limitations.

Joyner's goal is to develop high-performance optical sensors to capture light that passes through tissue with superior spatial mapping, faster optical response time and simultaneous measurement of multiple light signals to increase the visibility-millimeter structures.

Sameer Sonkusale, assistant professor of electrical and computer engineering, received a five-year $400,000 NSF early career award for his work in developing promising new techniques to assemble and grow nano-sized wires on silicon chips. Nanowires can be used in sensing devices to detect diseases in any bodily fluid, including urine and saliva.

In Sonkusale's two approaches, CMOS chips generate an electrical field that is precisely controlled to position nanomaterials to specific locations on the chip. In his technique for nanoassembly, a solution of suspended nanomaterials is incorporated directly onto a silicon chip. A well-controlled AC electric field is applied on metal electrodes of the chip. By manipulating the electrical field, the researchers can control the location, quantity and quality of the nanowire formation on the chip.

In a second technique, which is known as nanofabrication, Sonkusale has proposed growing nanowires using the template of nanoporous membranes such as anodic aluminum oxide directly on the chip. The nanopores can be dissolved in a solvent after nanowire growth leaving behind free-standing nanowires.

Sonkusale says that his second technique allows nanowires of different types (metal, metal oxides, semiconductors) to be produced faster and at lower costs than conventional ph
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Contact: Alexander Reid
alexander.reid@tufts.edu
617-627-4173
Tufts University
Source:Eurekalert

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