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<P ALIGN=RIGHT><B><FONT COLOR="#ffffff">MICRODISC ELECTRODE
ARRAYS</FONT></B><FONT SIZE=1><SUP>TM</SUP></FONT><B><FONT COLOR="#ffffff">
(MDEAs)<BR></FONT><FONT COLOR="#00ffff">(Microfrabricated Disc
Electrode Arrays (IDAs))</FONT></B></P>
</TD>
</TR>
</TABLE>
<DD>
<TABLE WIDTH=95% BORDER=0 CELLPADDING=2 CELLSPACING=0>
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<TD WIDTH=17%>
<P ALIGN=CENTER><A HREF="gifs/mdea1l.jpg"><IMG SRC="gifs/mdea1s.jpg" NAME="Graphic4" ALIGN=BOTTOM WIDTH=134 HEIGHT=75 BORDER=0></A></P>
</TD>
<TD WIDTH=14%>
<P ALIGN=CENTER><A HREF="gifs/mdea2l.jpg"><IMG SRC="picts/mdea.jpg" NAME="Graphic3" ALIGN=BOTTOM WIDTH=90 HEIGHT=75 BORDER=0></A></P>
</TD>
<TD WIDTH=14%>
<P ALIGN=CENTER><A HREF="picts/mdeacomp.bmp"><IMG SRC="picts/mdeacomp.JPG" NAME="Graphic11" ALIGN=BOTTOM WIDTH=90 HEIGHT=75 BORDER=0></A></P>
</TD>
<TD WIDTH=17%>
<P ALIGN=CENTER><A HREF="picts/mdea50um.jpg"><IMG SRC="picts/mdea50um.jpg" NAME="Graphic2" ALIGN=BOTTOM WIDTH=99 HEIGHT=76 BORDER=0></A></P>
</TD>
<TD WIDTH=18%>
<P ALIGN=CENTER><A HREF="picts/mdea100um.jpg"><IMG SRC="picts/mdea100um.jpg" NAME="Graphic9" ALIGN=BOTTOM WIDTH=90 HEIGHT=75 BORDER=0></A></P>
</TD>
<TD WIDTH=20%>
<P ALIGN=CENTER><A HREF="picts/mdea250um.jpg"><IMG SRC="picts/mdea250um.jpg" NAME="Graphic10" ALIGN=BOTTOM WIDTH=90 HEIGHT=75 BORDER=0></A></P>
</TD>
</TR>
</TABLE>
<DD>
<TABLE WIDTH=95% BORDER=0 CELLPADDING=3 CELLSPACING=0>
<COL WIDTH=77*>
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<TR>
<TD WIDTH=22% BGCOLOR="#cccccc">
<P ALIGN=CENTER class="style8"><FONT FACE="Verdana, Arial">MDEA
DEVICES</FONT></P> </TD>
<TD WIDTH=19% BGCOLOR="#cccccc"><span class="style8"><font face="Verdana, Arial"> Number of Discs</font></span></TD>
<TD WIDTH=26% BGCOLOR="#cccccc">
<P ALIGN=CENTER class="style8"><FONT FACE="Verdana, Arial">Disc
dimensions</FONT></P> </TD>
<TD WIDTH=14% BGCOLOR="#cccccc">
<P ALIGN=CENTER class="style8"><FONT FACE="Verdana, Arial">Active
Area</FONT></P> </TD>
<TD WIDTH=19% BGCOLOR="#cccccc">
<P ALIGN=CENTER class="style8"><FONT FACE="Verdana, Arial">Conductor</FONT></P> </TD>
</TR>
<TR>
<TD WIDTH=22% BGCOLOR="#e2ebf3">
<P class="style8"><FONT FACE="Verdana, Arial">MDEA 360</FONT></P> </TD>
<TD WIDTH=19% BGCOLOR="#eeded9"><span class="style9"><font face="Verdana, Arial"> 1 disc</font></span></TD>
<TD WIDTH=26% BGCOLOR="#eeded9">
<P ALIGN=CENTER class="style9"><FONT FACE="Verdana, Arial">3,600
microns diameter discs</FONT></P> </TD>
<TD WIDTH=14% BGCOLOR="#f0f0f0">
<P ALIGN=CENTER class="style9"><FONT FACE="Verdana, Arial">0.10 cm<SUP>2</SUP></FONT></P> </TD>
<TD WIDTH=19% BGCOLOR="#f2e4ca">
<P ALIGN=CENTER class="style9"><FONT FACE="Verdana, Arial">Au, Pt,
ITO</FONT></P> </TD>
</TR>
<TR>
<TD WIDTH=22% BGCOLOR="#e2ebf3">
<P class="style9"><FONT FACE="Verdana, Arial"><B>MDEA 250</B></FONT></P> </TD>
<TD WIDTH=19% BGCOLOR="#eeded9"><span class="style9"><font face="Verdana, Arial"> 207 microdiscs </font></span></TD>
<TD WIDTH=26% BGCOLOR="#eeded9">
<P ALIGN=CENTER class="style9"><FONT FACE="Verdana, Arial">250
microns diameter discs</FONT></P> </TD>
<TD WIDTH=14% BGCOLOR="#f0f0f0">
<P ALIGN=CENTER class="style9"><FONT FACE="Verdana, Arial">0.10 cm<SUP>2</SUP></FONT></P> </TD>
<TD WIDTH=19% BGCOLOR="#f2e4ca">
<P ALIGN=CENTER class="style9"><FONT FACE="Verdana, Arial">Au, Pt,
ITO</FONT></P> </TD>
</TR>
<TR>
<TD WIDTH=22% BGCOLOR="#e2ebf3">
<P class="style9"><FONT FACE="Verdana"><B>MDEA 100</B></FONT></P> </TD>
<TD WIDTH=19% BGCOLOR="#eeded9"><span class="style9"><font face="Verdana, Arial"> 1,296 microdiscs</font></span></TD>
<TD WIDTH=26% BGCOLOR="#eeded9">
<P ALIGN=CENTER class="style9"><FONT FACE="Verdana, Arial">100
microns diameter discs</FONT></P> </TD>
<TD WIDTH=14% BGCOLOR="#f0f0f0">
<P ALIGN=CENTER class="style9"><FONT FACE="Verdana, Arial">0.10 cm<SUP>2</SUP></FONT></P> </TD>
<TD WIDTH=19% BGCOLOR="#f2e4ca">
<P ALIGN=CENTER class="style9"><FONT FACE="Verdana, Arial">Au, Pt,
ITO</FONT></P> </TD>
</TR>
<TR>
<TD WIDTH=22% BGCOLOR="#e2ebf3">
<P class="style9"><FONT FACE="Verdana, Arial"><B>MDEA 050</B></FONT></P> </TD>
<TD WIDTH=19% BGCOLOR="#eeded9"><span class="style9"><font face="Verdana, Arial"> 5,184 microdiscs</font></span></TD>
<TD WIDTH=26% BGCOLOR="#eeded9">
<P ALIGN=CENTER class="style9"><FONT FACE="Verdana, Arial">50
microns diameter discs</FONT></P> </TD>
<TD WIDTH=14% BGCOLOR="#f0f0f0">
<P ALIGN=CENTER class="style9"><FONT FACE="Verdana, Arial">0.10 cm<SUP>2</SUP></FONT></P> </TD>
<TD WIDTH=19% BGCOLOR="#f2e4ca">
<P ALIGN=CENTER class="style9"><FONT FACE="Verdana, Arial">Au, Pt,
ITO</FONT></P> </TD>
</TR>
<TR>
<TD WIDTH=22% BGCOLOR="#e2ebf3">
<P class="style9"><BR>
</P> </TD>
<TD WIDTH=19% BGCOLOR="#eeded9"> </TD>
<TD WIDTH=26% BGCOLOR="#eeded9">
<P ALIGN=CENTER class="style9"><BR>
</P> </TD>
<TD WIDTH=14% BGCOLOR="#f0f0f0">
<P ALIGN=CENTER class="style9"><BR>
</P> </TD>
<TD WIDTH=19% BGCOLOR="#f2e4ca">
<P ALIGN=CENTER class="style9"><BR>
</P> </TD>
</TR>
</TABLE>
<DD>
<TABLE WIDTH=95% BORDER=0 CELLPADDING=2 CELLSPACING=0>
<COL WIDTH=52*>
<COL WIDTH=54*>
<COL WIDTH=51*>
<COL WIDTH=37*>
<COL WIDTH=19*>
<COL WIDTH=43*>
<TR>
<TD WIDTH=20% HEIGHT=22></TD>
<TD WIDTH=21%>
<P ALIGN=CENTER><FONT SIZE=1>MDEA Brochure (PDF)</FONT></P>
</TD>
<TD WIDTH=20%>
<P ALIGN=CENTER><A HREF="pricelist.html#mdeas"><FONT SIZE=1>MDEA
Prices</FONT></A></P>
</TD>
<TD WIDTH=14%>
<P ALIGN=CENTER><A HREF="pricelist.html"><FONT SIZE=1>Price List</FONT></A></P>
</TD>
<TD WIDTH=7%></TD>
<TD WIDTH=17%></TD>
</TR>
<TR>
<TD WIDTH=20% HEIGHT=20>
<P ALIGN=CENTER><A HREF="#introduction"><FONT SIZE=1>Introduction
and Background</FONT></A></P>
</TD>
<TD WIDTH=21%>
<P ALIGN=CENTER><A HREF="#applications"><FONT SIZE=1>Applications
of MDEAs</FONT></A></P>
</TD>
<TD WIDTH=20%>
<P ALIGN=CENTER><A HREF="#specifications"><FONT SIZE=1>Technical
Specifications</FONT></A></P>
</TD>
<TD WIDTH=14%>
<P ALIGN=CENTER><A HREF="#accessories"><FONT SIZE=1>MDEA
Accessories</FONT></A></P>
</TD>
<TD WIDTH=7%>
<P ALIGN=CENTER><A HREF="#methods"><FONT SIZE=1>Methods</FONT></A></P>
</TD>
<TD WIDTH=17%>
<P ALIGN=CENTER><A HREF="#appnotes"><FONT SIZE=1>Application
Notes</FONT></A></P>
</TD>
</TR>
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<TD COLSPAN=10>
<H3><A NAME="introduction"></A><IMG SRC="tbullet.gif" NAME="Graphic5" ALIGN=BOTTOM WIDTH=12 HEIGHT=12 BORDER=0>
<FONT SIZE=3><FONT FACE="Verdana">Introduction and Background</FONT></FONT></H3>
<BLOCKQUOTE><FONT FACE="Verdana"><span class="style1"><span class="style2"><span class="style3"><span class="style4"><span class="style9"><B><FONT COLOR="#00af00">Ø
</FONT></B>Microdisc Electrode Arrays (MDEAs) are inert, array
microelectrodes formed from a microlithographically patterned
insulator-on-conductor-on-insulator configuration. They are
designed for the study of electrochemical and optical properties
of thin polymeric films and coatings, for applications in
microelectrochemistry, for electrical/electrochemical impedance
spectroscopy, and for chemical and biological sensor development.</span></span></span></span></span></FONT></BLOCKQUOTE>
<BLOCKQUOTE class="style9"><FONT FACE="Verdana"><B><FONT COLOR="#00af00">Ø
</FONT></B>Microfabricated from 100 nm magnetron
sputter-deposited gold, e-gun vapor-deposited platinum, or
conductive indium tin oxide (ITO) on an electronics grade
borosilicate glass, these devices are supplied in three microdisc
diameters and corresponding microdisc densities. A 500nm thin
silicon nitride layer is applied over the conductor and is
microlithographically windowed using reactive ion etching to
reveal an array of micro-windows to the metal beneath and a
bonding pad. MDEAs are avalable as packaged (with attached
leadwires and encapsulated) or as un-packaged die. </FONT> </BLOCKQUOTE>
<BLOCKQUOTE class="style9"><FONT FACE="Verdana"><B><FONT COLOR="#00af00">Ø
</FONT></B>MDEA chips of gold, platinum, or ITO are available
with 50 microns, 100 microns, 250 microns, or 3,600 microns disc
diameter. </FONT> </BLOCKQUOTE>
<BLOCKQUOTE class="style9"><FONT FACE="Verdana"><B><FONT COLOR="#00af00">Ø
</FONT></B>In research and product development, these devices are
widely used for conductimetric, chemoresistive chemical and
biological sensors using electrically conducting
(electroconductive) polymers, for impedance sensors based on
Langmuir-Blodgett thin films, for studying environmental effects
on polymer thin films, and in modern micro-electrochemistry.</FONT></BLOCKQUOTE>
<BLOCKQUOTE class="style9"><FONT FACE="Verdana"><B><FONT COLOR="#00af00">Ø
</FONT></B>Investigate the chemoresistive responses of
transducer-active, polymeric thin films in the same electrode
configuration, the same test environment, and on the same sample
film. Develop these devices into products where the application
requires a compact, durable and versatile chemical or biological
chemoresistive or electroanalytical sensor of low cost.</FONT></BLOCKQUOTE>
<BLOCKQUOTE><A HREF="#top"><FONT SIZE=1>Back to Index</FONT></A></BLOCKQUOTE>
<HR>
<H3><A NAME="applications"></A><FONT SIZE=3><IMG SRC="tbullet.gif" NAME="Graphic6" ALIGN=BOTTOM WIDTH=12 HEIGHT=12 BORDER=0>
Applications of MDEAs</FONT></H3>
<P class="style9"><FONT FACE="Verdana">Applications of MDEAs in
research and product development include:</FONT></P>
<BLOCKQUOTE class="style9"><FONT FACE="Verdana"><B><FONT COLOR="#00af00">Ø
</FONT></B>As conductimetric chemical sensors and biosensors
based on electroactive polymers. Such devices exploit the very
large change in electrical impedance that accompanies
oxidation/reduction of these polymer films. Films are conferred
with chemical and biological specificity through the use of
inorganic catalysts, organic hosts-guests binding compounds,
synthetic antibodies, or molecularly imprionted polymers, and
natural biorecognition agents such as enzymes, antibodies and
DNA. </FONT> </BLOCKQUOTE>
<BLOCKQUOTE class="style9"><FONT FACE="Verdana"><B><FONT COLOR="#00af00">Ø
</FONT></B>For the study of electrical and electrochemical
impedance spectroscopy of organic thin films and coatings and
carbon nanotubes. </FONT> </BLOCKQUOTE>
<BLOCKQUOTE class="style9"><FONT FACE="Verdana"><B><FONT COLOR="#00af00">Ø
</FONT></B>As a capacitance probe during the deposition or cure
of an organic thin film or polymer e.g. Films based on
Langmuir-Blodgett thin film deposition or cure of an epoxy.</FONT></BLOCKQUOTE>
<BLOCKQUOTE class="style9"><FONT FACE="Verdana"><B><FONT COLOR="#00af00">Ø
</FONT></B>In modern microelectrochemistry -- as generator and
collector electrodes in electrochemical amplification or in the
performance of electroanalysis in high impedance environments.
The microdisc electrode format allows accommodates radial
diffusion . </FONT> </BLOCKQUOTE>
<BLOCKQUOTE class="style9"><FONT FACE="Verdana"><B><FONT COLOR="#00af00">Ø
</FONT></B>In conductimetry studies. To determine the conductance
of low conductivity media and in conductimetric titrations.</FONT></BLOCKQUOTE>
<BLOCKQUOTE class="style9"><FONT FACE="Verdana"><B><FONT COLOR="#00af00">Ø
</FONT></B>In coatings research and development. For example, to
study the transport of water into and through a coating or to
study the physical aging of the polymer upon environmental
exposure or accelerated aging.</FONT></BLOCKQUOTE>
<BLOCKQUOTE><A HREF="#top"><FONT SIZE=1>Back to Index</FONT></A></BLOCKQUOTE>
<HR>
<H3><A NAME="specifications"></A><FONT FACE="Verdana"><FONT SIZE=3><IMG SRC="tbullet.gif" NAME="Graphic7" ALIGN=BOTTOM WIDTH=12 HEIGHT=12 BORDER=0>
Technical Specifications</FONT></FONT></H3> </TD>
</TR>
<TR>
<TD ROWSPAN=11 WIDTH=2% VALIGN=TOP></TD>
<TD WIDTH=15%>
<P class="style9"><FONT FACE="Verdana"><B><FONT COLOR="#00af00">Ø
</FONT>Chip Substrate:</B></FONT></P> </TD>
<TD COLSPAN=3>
<P ALIGN=LEFT class="style9"><FONT FACE="Verdana"><B>Schott
D263 Borosilicate Glass</B></FONT></P> </TD>
<TD COLSPAN=3>
<P class="style9"><BR>
</P> </TD>
<TD WIDTH=7% ROWSPAN=11 VALIGN=TOP></TD>
</TR>
<TR>
<TD WIDTH=15%>
<P class="style9"><BR>
</P> </TD>
<TD COLSPAN=3>
<P ALIGN=LEFT class="style9"><FONT FACE="Verdana">Dielectric
Constant, Epsilon(r) at 1 MHz</FONT></P> </TD>
<TD COLSPAN=3>
<P ALIGN=LEFT class="style9"><FONT FACE="Verdana">6.7</FONT></P> </TD>
</TR>
<TR>
<TD WIDTH=15%>
<P class="style9"><BR>
</P> </TD>
<TD COLSPAN=3>
<P ALIGN=LEFT class="style9"><FONT FACE="Verdana">Dielectric
Loss Angle, tan delta, at 1 MHz</FONT></P> </TD>
<TD COLSPAN=3>
<P ALIGN=LEFT class="style9"><FONT FACE="Verdana">61
x 10-4</FONT></P> </TD>
</TR>
<TR>
<TD WIDTH=15%>
<P class="style9"><BR>
</P> </TD>
<TD COLSPAN=3>
<P ALIGN=LEFT class="style9"><FONT FACE="Verdana">Electrical
Resistivity (50 Hz) (250 C) </FONT> </P> </TD>
<TD COLSPAN=3>
<P ALIGN=LEFT class="style9"><FONT FACE="Verdana">1.6
x 10^8 ohm cm</FONT></P> </TD>
</TR>
<TR>
<TD WIDTH=15%>
<P class="style9"><BR>
</P> </TD>
<TD COLSPAN=3>
<P ALIGN=LEFT class="style9"><FONT FACE="Verdana">Coefficient
of Linear Thermal Expansion, * 20-300 Deg C</FONT></P> </TD>
<TD COLSPAN=3>
<P ALIGN=LEFT class="style9"><FONT FACE="Verdana">7.2
x 10^-6 K^-1</FONT></P> </TD>
</TR>
<TR>
<TD WIDTH=15%>
<P class="style9"><BR>
</P> </TD>
<TD COLSPAN=3>
<P ALIGN=LEFT class="style9"><FONT FACE="Verdana">Refractive
Index at 20 C, ne ( Lambda = 546.1 nm)</FONT></P> </TD>
<TD COLSPAN=3>
<P ALIGN=LEFT class="style9"><FONT FACE="Verdana">1.5249</FONT></P> </TD>
</TR>
<TR>
<TD WIDTH=15%>
<P class="style9"><BR>
</P> </TD>
<TD COLSPAN=3>
<P ALIGN=LEFT class="style9"><BR>
</P> </TD>
<TD COLSPAN=3>
<P ALIGN=LEFT class="style9"><BR>
</P> </TD>
</TR>
<TR>
<TD WIDTH=15%>
<P class="style9"><FONT FACE="Verdana"><B><FONT COLOR="#00af00">Ø
</FONT>Metallization: </B></FONT> </P> </TD>
<TD COLSPAN=3>
<P ALIGN=LEFT class="style9"><FONT FACE="Verdana"><B>100
Å Ti|W / 1000 Å Au or Pt and ITO = 10 Ohms/sq</B></FONT></P> </TD>
<TD COLSPAN=3>
<P class="style9"><BR>
</P> </TD>
</TR>
<TR>
<TD WIDTH=15%>
<P class="style9"><BR>
</P> </TD>
<TD COLSPAN=3>
<P ALIGN=LEFT class="style9"><BR>
</P> </TD>
<TD COLSPAN=3>
<P class="style9"><BR>
</P> </TD>
</TR>
<TR>
<TD WIDTH=15%>
<P class="style9"><FONT FACE="Verdana"><B><FONT COLOR="#00af00">Ø
</FONT>Insulating Top Layer: </B></FONT> </P> </TD>
<TD COLSPAN=3>
<P ALIGN=LEFT class="style9">Silicon Nitride
(Si<SUB>3</SUB>N<SUB>4</SUB>)</P> </TD>
<TD COLSPAN=3>
<P class="style9"><BR>
</P> </TD>
</TR>
<TR>
<TD WIDTH=15%>
<P class="style9"><BR>
</P> </TD>
<TD COLSPAN=3>
<P ALIGN=LEFT class="style9"><BR>
</P> </TD>
<TD COLSPAN=3>
<P class="style9"><BR>
</P> </TD>
</TR>
<TR>
<TD ROWSPAN=14 WIDTH=2% VALIGN=TOP></TD>
<TD COLSPAN=2 HEIGHT=23>
<P class="style9"><BR>
</P> </TD>
<TD WIDTH=42%>
<P class="style9"><BR>
</P> </TD>
<TD COLSPAN=2>
<P ALIGN=LEFT class="style9"><FONT FACE="Verdana"><B>No
of Discs</B></FONT></P> </TD>
<TD WIDTH=14%>
<P ALIGN=LEFT class="style9"><FONT FACE="Verdana"><B>Electroactive
Area (cm<SUP>2</SUP>)</B></FONT></P> </TD>
<TD colspan="2">
<P ALIGN=LEFT class="style9"><FONT FACE="Verdana"><B>Geometric
Area (cm<SUP>2</SUP>)</B></FONT></P></TD>
<TD ROWSPAN=14 WIDTH=2% VALIGN=TOP></TD>
</TR>
<TR>
<TD COLSPAN=2 HEIGHT=20>
<P class="style9" STYLE="font-style: normal; font-weight: medium"><FONT FACE="Verdana"><B><FONT COLOR="#00af00">Ø</FONT></B>
MDEA 360</FONT></P> </TD>
<TD WIDTH=42%>
<P ALIGN=LEFT class="style9"><FONT FACE="Verdana">A
single disc, 3.60 mm in diameter.</FONT></P> </TD>
<TD COLSPAN=2>
<P ALIGN=LEFT class="style9"><FONT FACE="Verdana">1</FONT></P> </TD>
<TD WIDTH=14%>
<P ALIGN=LEFT class="style9"><FONT FACE="Verdana">1.0
x10<SUP>-1</SUP></FONT></P> </TD>
<TD colspan="2">
<P ALIGN=LEFT class="style9"><FONT FACE="Verdana">1.0
x10<SUP>-1</SUP></FONT></P></TD>
</TR>
<TR>
<TD COLSPAN=2 HEIGHT=20>
<P class="style9" STYLE="font-style: normal; font-weight: medium"><FONT FACE="Verdana"><FONT COLOR="#00af00">Ø</FONT>
MDEA 250</FONT></P> </TD>
<TD WIDTH=42%>
<P ALIGN=LEFT class="style9"><FONT FACE="Verdana">207
separate discs, each 250 <FONT FACE="Symbol, serif">m</FONT>m in
diameter and arranged 500 <FONT FACE="Symbol, serif">m</FONT>m on
centers in a hexagonal close packaed array. </FONT> </P> </TD>
<TD COLSPAN=2>
<P ALIGN=LEFT class="style9"><FONT FACE="Verdana">207</FONT></P> </TD>
<TD WIDTH=14%>
<P ALIGN=LEFT class="style9"><FONT FACE="Verdana">1.0
x10<SUP>-1</SUP></FONT></P> </TD>
<TD colspan="2">
<P ALIGN=LEFT class="style9"><FONT FACE="Verdana">4.5
x10<SUP>-1</SUP></FONT></P></TD>
</TR>
<TR>
<TD COLSPAN=2 HEIGHT=20>
<P class="style9" STYLE="font-style: normal; font-weight: medium"><FONT FACE="Verdana"><FONT COLOR="#00af00">Ø</FONT>
MDEA 100</FONT></P> </TD>
<TD WIDTH=42%>
<P ALIGN=LEFT class="style9"><FONT FACE="Verdana">1,296
separate discs, each 100 <FONT FACE="Symbol, serif">m</FONT>m in
diameter and arranged 200 <FONT FACE="Symbol, serif">m</FONT>m on
centers in a hexagonal close packaed array. </FONT> </P> </TD>
<TD COLSPAN=2>
<P ALIGN=LEFT class="style9"><FONT FACE="Verdana">1,296</FONT></P> </TD>
<TD WIDTH=14%>
<P ALIGN=LEFT class="style9"><FONT FACE="Verdana">1.0
x10<SUP>-1</SUP></FONT></P> </TD>
<TD colspan="2">
<P ALIGN=LEFT class="style9"><FONT FACE="Verdana">4.5
x10<SUP>-1</SUP></FONT></P></TD>
</TR>
<TR>
<TD COLSPAN=2 HEIGHT=20>
<P class="style9" STYLE="font-style: normal; font-weight: medium"><FONT FACE="Verdana"><FONT COLOR="#00af00">Ø</FONT>
MDEA 050</FONT></P> </TD>
<TD WIDTH=42%>
<P ALIGN=LEFT class="style9"><FONT FACE="Verdana">5,184
separate discs, each 50 <FONT FACE="Symbol, serif">m</FONT>m in
diameter and arranged 100 <FONT FACE="Symbol, serif">m</FONT>m on
centers in a hexagonal close packaed array. </FONT> </P> </TD>
<TD COLSPAN=2>
<P ALIGN=LEFT class="style9"><FONT FACE="Verdana">5,184</FONT></P> </TD>
<TD WIDTH=14%>
<P ALIGN=LEFT class="style9"><FONT FACE="Verdana">1.0
x10<SUP>-1</SUP></FONT></P> </TD>
<TD colspan="2">
<P ALIGN=LEFT class="style9"><FONT FACE="Verdana">4.5
x10<SUP>-1</SUP></FONT></P></TD>
</TR>
<TR>
<TD COLSPAN=2 HEIGHT=20>
<P class="style9"><BR>
</P> </TD>
<TD WIDTH=42%>
<P ALIGN=LEFT class="style9"><BR>
</P> </TD>
<TD COLSPAN=2>
<P ALIGN=LEFT class="style9"><BR>
</P> </TD>
<TD WIDTH=14%>
<P ALIGN=LEFT class="style9"><BR>
</P> </TD>
<TD colspan="2">
<P ALIGN=LEFT class="style9"><BR>
</P></TD>
</TR>
<TR>
<TD COLSPAN=2 HEIGHT=20>
<P class="style9"><FONT FACE="Verdana"><B><FONT COLOR="#00af00">Ø
</FONT>MDEA Chip Dimensions</B></FONT></P> </TD>
<TD WIDTH=42%>
<P ALIGN=CENTER class="style9"><FONT FACE="Verdana"><B>Un-packaged
Die</B></FONT></P> </TD>
<TD COLSPAN=5>
<P ALIGN=CENTER class="style9"><FONT FACE="Verdana"><B>Packaged
Die</B></FONT></P> </TD>
</TR>
<TR>
<TD COLSPAN=2 HEIGHT=20>
<P class="style9"><BR>
</P> </TD>
<TD WIDTH=42%>
<P ALIGN=CENTER class="style9"><FONT FACE="Verdana"><B>(l
x w x t)</B></FONT></P> </TD>
<TD COLSPAN=5>
<P ALIGN=CENTER class="style9"><FONT FACE="Verdana"><B>(l
x w x t)</B></FONT></P> </TD>
</TR>
<TR>
<TD COLSPAN=2 HEIGHT=20>
<P class="style9" STYLE="font-style: normal; font-weight: medium"><FONT FACE="Verdana">MDEA
XXX</FONT></P> </TD>
<TD WIDTH=42%>
<P ALIGN=CENTER class="style9"><FONT FACE="Verdana">2.00
x 1.00 x 0.05 cm</FONT></P> </TD>
<TD COLSPAN=5>
<P ALIGN=CENTER class="style9"><FONT FACE="Verdana">13.2
x 1.38 x 0.7 cm</FONT></P> </TD>
</TR>
<TR>
<TD COLSPAN=2 HEIGHT=20>
<P class="style9"><BR>
</P> </TD>
<TD WIDTH=42%>
<P class="style9"><BR>
</P> </TD>
<TD COLSPAN=5>
<P class="style9"><BR>
</P> </TD>
</TR>
<TR>
<TD COLSPAN=2 HEIGHT=20>
<P class="style9"><FONT FACE="Verdana"><B><FONT COLOR="#00af00">Ø
</FONT>Packaging</B></FONT></P> </TD>
<TD WIDTH=42%>
<P class="style9"><BR>
</P> </TD>
<TD COLSPAN=5>
<P class="style9"><BR>
</P> </TD>
</TR>
<TR>
<TD COLSPAN=2 HEIGHT=20>
<P class="style9"><FONT FACE="Verdana">Electrode
Body:</FONT></P> </TD>
<TD COLSPAN=6>
<P ALIGN=LEFT class="style9"><FONT FACE="Verdana">PVC-Jacketed
printed circuit board</FONT></P> </TD>
</TR>
<TR>
<TD COLSPAN=2 HEIGHT=20>
<P class="style9"><FONT FACE="Verdana">Encapsulant:</FONT></P> </TD>
<TD COLSPAN=6>
<P ALIGN=LEFT class="style9"><FONT FACE="Verdana">Epoxy
header. Polyimide packaged chip.</FONT></P> </TD>
</TR>
<TR>
<TD COLSPAN=2 HEIGHT=21>
<P class="style9"><FONT FACE="Verdana">Leadwires:</FONT></P> </TD>
<TD COLSPAN=6>
<P ALIGN=LEFT class="style9"><FONT FACE="Verdana">Color
coded, 28 AWG stranded copper, shielded, and PVC jacketed</FONT></P> </TD>
</TR>
<TR>
<TD COLSPAN=10>
<BLOCKQUOTE><A HREF="#top"><FONT SIZE=1>Back to Index</FONT></A></BLOCKQUOTE> </TD>
</TR>
</TABLE>
<DD>
<TABLE WIDTH=95% BORDER=0 CELLPADDING=3 CELLSPACING=0>
<COL WIDTH=97*>
<COL WIDTH=70*>
<COL WIDTH=88*>
<TR>
<TD COLSPAN=3 WIDTH=100%>
<HR>
<H3 ALIGN=LEFT STYLE="margin-top: 0cm; font-style: normal; font-weight: medium"><A NAME="accessories"></A>
<FONT FACE="Verdana"><FONT SIZE=3><IMG SRC="tbullet.gif" NAME="Graphic8" ALIGN=BOTTOM WIDTH=12 HEIGHT=12 BORDER=0>
<B>MDEA Accessories</B></FONT></FONT></H3> </TD>
</TR>
<TR>
<TD WIDTH=38% BGCOLOR="#cccccc">
<P ALIGN=CENTER><BR>
</P> </TD>
<TD WIDTH=27% VALIGN=TOP BGCOLOR="#cccccc">
<P ALIGN=CENTER><FONT FACE="Verdana"><B>Wand</B></FONT></P>
<P ALIGN=CENTER><FONT COLOR="#000080"><A HREF="picts/iamepl.jpg"><FONT COLOR="#000080"><IMG SRC="picts/iameps.jpg" NAME="Graphic16" ALIGN=BOTTOM WIDTH=90 HEIGHT=67 BORDER=1></FONT></A></FONT></P> </TD>
<TD WIDTH=35% BGCOLOR="#cccccc">
<P ALIGN=CENTER><FONT FACE="Verdana"><B>Test Clip</B></FONT></P>
<P ALIGN=CENTER><FONT COLOR="#000080"><FONT FACE="Verdana"><B><A HREF="gifs/IMESTC.gif"><FONT COLOR="#000080"><IMG SRC="gifs/imestcs.jpg" NAME="Graphic1" ALIGN=BOTTOM WIDTH=54 HEIGHT=72 BORDER=1></FONT></A></B></FONT></FONT></P> </TD>
</TR>
<TR>
<TD WIDTH=38% BGCOLOR="#e4ecf5">
<P class="style9"><FONT FACE="Verdana"><B>Lead Length</B></FONT></P> </TD>
<TD WIDTH=27% BGCOLOR="#e6e6ff">
<P ALIGN=CENTER class="style9" STYLE="font-weight: medium"><FONT FACE="Verdana">4.5
cm</FONT></P> </TD>
<TD WIDTH=35% BGCOLOR="#f5eeeb">
<P ALIGN=CENTER class="style9"><FONT FACE="Verdana">N/A</FONT></P> </TD>
</TR>
<TR>
<TD WIDTH=38% BGCOLOR="#e4ecf5">
<P class="style9"><FONT FACE="Verdana"><B>Connector Type</B></FONT></P> </TD>
<TD WIDTH=27% BGCOLOR="#e6e6ff">
<P ALIGN=CENTER class="style9" STYLE="font-weight: medium"><FONT FACE="Verdana">Gold
Plated</FONT> Pins </P> </TD>
<TD WIDTH=35% BGCOLOR="#f5eeeb">
<P ALIGN=CENTER class="style9"><FONT FACE="Verdana">Gold Plated
Pins</FONT></P> </TD>
</TR>
<TR>
<TD WIDTH=38% BGCOLOR="#e4ecf5">
<P class="style9"><FONT FACE="Verdana"><B>Number of Conductors</B></FONT></P> </TD>
<TD WIDTH=27% BGCOLOR="#e6e6ff">
<P ALIGN=CENTER class="style9" STYLE="font-weight: medium"><FONT FACE="Verdana">4</FONT></P> </TD>
<TD WIDTH=35% BGCOLOR="#f5eeeb">
<P ALIGN=CENTER class="style9"><FONT FACE="Verdana">4</FONT></P> </TD>
</TR>
<TR>
<TD WIDTH=38% BGCOLOR="#e4ecf5">
<P class="style9"><FONT FACE="Verdana"><B>Lead</B></FONT></P> </TD>
<TD WIDTH=27% BGCOLOR="#e6e6ff">
<P ALIGN=CENTER class="style9" STYLE="font-weight: medium"><FONT FACE="Verdana">Rigid
Wand</FONT> - PCB </P> </TD>
<TD WIDTH=35% BGCOLOR="#f5eeeb">
<P ALIGN=CENTER class="style9"><FONT FACE="Verdana">Spring Loaded Pinch Clip </FONT></P> </TD>
</TR>
<TR>
<TD WIDTH=38% BGCOLOR="#e4ecf5">
<P class="style9"><FONT FACE="Verdana"><B>Part No.</B></FONT></P> </TD>
<TD WIDTH=27% BGCOLOR="#e6e6ff">
<P ALIGN=CENTER class="style9"><FONT COLOR="#00af00"><FONT FACE="Verdana"><B>IME 4C Chip Carrier</B></FONT></FONT></P> </TD>
<TD WIDTH=35% BGCOLOR="#f5eeeb">
<P ALIGN=CENTER class="style9"><FONT COLOR="#00af00"><FONT FACE="Verdana"><B>STC 4P</B></FONT></FONT> </P> </TD>
</TR>
</TABLE>
</DL>
<BLOCKQUOTE STYLE="text-align: left"><FONT SIZE=1> </FONT><A HREF="#top"><FONT SIZE=1>Back
to Index</FONT></A></BLOCKQUOTE>
<DL>
<DD>
<TABLE WIDTH=95% BORDER=0 CELLPADDING=0 CELLSPACING=0>
<COL WIDTH=256*>
<TR>
<TD WIDTH=100%>
<H3><A NAME="methods"></A><IMG SRC="tbullet.gif" NAME="Graphic13" ALIGN=BOTTOM WIDTH=12 HEIGHT=12 BORDER=0>
<FONT SIZE=3><FONT FACE="Verdana">Methods</FONT></FONT></H3>
<BLOCKQUOTE><FONT FACE="Verdana"><span class="style9"><B><FONT COLOR="#00af00">Ø
</FONT></B>Films or coatings may be applied to the MDEA device by
dip coating, spin casting, spray painting, air-brushing, brush
painting, by Langmuir-Blodgett thin film deposition technique, by
electropolymerization, and/or by molecular self assembly.</span></FONT></BLOCKQUOTE>
<BLOCKQUOTE class="style9"><FONT FACE="Verdana"><B><FONT COLOR="#00af00">Ø
</FONT></B><FONT COLOR="#000000">The chip may be immersed in
organic, or aqueous medium to a level above the geometric area
occupied by microdiscs. </FONT></FONT> </BLOCKQUOTE>
<BLOCKQUOTE class="style9" STYLE="font-weight: medium"><FONT FACE="Verdana"><B><FONT COLOR="#00af00">Ø
</FONT></B>Electrical contact is made via bonding pad loacaed on
on end of the chip.</FONT></BLOCKQUOTE>
<P ALIGN=LEFT class="style9"> <A HREF="#top">Back to
Index</A></P>
<HR>
<P ALIGN=LEFT><A NAME="appnotes"></A><IMG SRC="tbullet.gif" NAME="Graphic14" ALIGN=BOTTOM WIDTH=12 HEIGHT=12 BORDER=0>
<B><FONT SIZE=3>Application Notes </FONT></B> </P>
<BLOCKQUOTE class="style9">For further information, request
Application Notes or you may <A HREF="files.html">download
application note files</A>:</BLOCKQUOTE>
<BLOCKQUOTE class="style9" STYLE="margin-left: 2.08cm; margin-right: 2.08cm"><FONT FACE="Verdana">Microdisc
Electrode Array (MDEA<SUP>TM</SUP>) is the tradename for a family
of devices developed by ABTECH. Also called microelectrode
arrays, these devices are microfabricated (using microelectronics
fabrication techniques) to form patterns of conductors deposited
on an insulating substrate chip.</FONT></BLOCKQUOTE>
<P ALIGN=LEFT><A HREF="#top"><FONT SIZE=1>Back to Index</FONT></A></P> </TD>
</TR>
<TR>
<TD WIDTH=100%>
<HR>
</TD>
</TR>
</TABLE>
</DL>
<P CLASS="text-body-indent" ALIGN=CENTER><FONT SIZE=1><FONT FACE="Verdana, Arial">Contact:<B>
Ann M. Wilson, </B>Manager, <BR>Applications Development ABTECH
Scientific, Inc.<BR>
800 East Leigh Street, Richmond, Virginia
23219<BR>
Telephone Number: +1-804-783-7829 Fax Number:
+1-804-783-7830<BR>e-mail: <A HREF="mailto:[email protected]">[email protected]</A></FONT></FONT></P>
<P ALIGN=CENTER STYLE="margin-left: 1cm"><FONT FACE="Verdana, Arial"><FONT SIZE=1>Last
Revision 04/03/2010, (c) 2000-2010 ABTECH Scientific, Inc.</FONT></FONT></P>
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