Preparation and electrical characterization of electrospun multi wall carbon nano tube embedded conductive Su8 nanofibers

Durga Prakash, M and Ramakrishana, S and Dutta, Asudeb and et al, . (2013) Preparation and electrical characterization of electrospun multi wall carbon nano tube embedded conductive Su8 nanofibers. In: INTERNATIONAL WORKSHOP ON THE PHYSICS OF SEMICONDUCTOR DEVICES(IWPSD 2013), 10-13 december 2013, Amity Uni.

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This paper reports preparation of conductive SU-8 derived nanofibers using electrospinning technique. Nanofibers derived out of SU-8, a negative epoxy photoresist are insulating in nature. In order to increase the conductivity, multi walled carbon nanotubes (MWCNTs) are embedded into the nanofibres. This is achieved by mixing MWCNTs dispersed in chloroform with SU-8 negative photoresist. The mixture is then electospun onto array of copper (Cu) electrodes. The conductivity is further improved by a low temperature heat treatment process. This paper reports in detail, the steps involved in fabrication and electrical characterization of these MWCNTs embedded SU-8 nanofibres. Index Terms: SU-8, Multi walled Carbon Nanotube Elctrospinning, Heat treatment, Electrical Conductivity  Electrospinning technique as a simple, convenient, and versatile method has been utilized in the preparation of many one-dimensional nanostructural materials such as long fibers with diameters ranging from tens of nanometers up to micrometers.  Nanofibers can be produced with a variety of polymers depending on the application.  In recent years, carbon-based nanostructures, such as carbon nanotubes (CNTs), nanofibers, and graphene as well as various inorganic nanowires have shown great potential for developing biosensors with improved sensitivity.  SU-8 is a negative epoxy photoresist which is biocompatible and its surface can be easily functionalized.  Nanofibers derived out of SU-8 can potentially be used as high sensitive biosensors.  The resistivity of SU-8 is really high which causes the nanofibers derived out of it to be highly resistive.  Researchers have employed pyrolysis technique to carbonize SU-8 which results in enhanced conductivity.  These high temperature processes hinder integrating the nanofibers in various other technological domains, specifically CMOS compatible biosensor application which our group is targeting to achieve.  Alternatively conductivity can be enhanced by embedding nanofibers with MWCNTs.  To the best of our knowledge, there is no report on enhancement of conductivity of SU-8 derived nanofibers using MWCNTs. This paper addresses the challenges involved in preparing these nanofibres. II. Experimental Details III. Results and Discussion IV. Conclusions References FIG.1: Schematic representing fabrication of micro-electrode array using lift off process  This work reports the methodology to prepare MWCNTs embedded SU-8 derived nanofibers.  A significant improvement in electrical conductivity is achieved using a low heat treatment process.  These nanofibers can potentially be used in impedance based or ISFET based biosensors by performing suitable surface functionalization based on the target analyte. Abstract IWPSD 2013

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Item Type: Conference or Workshop Item (Paper)
Subjects: Electrical Engineering
Divisions: Department of Electrical Engineering
Depositing User: Library Staff
Date Deposited: 12 Sep 2019 04:36
Last Modified: 12 Sep 2019 04:36
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